EP2509558A1 - Composition dentaire - Google Patents

Composition dentaire

Info

Publication number
EP2509558A1
EP2509558A1 EP10788023A EP10788023A EP2509558A1 EP 2509558 A1 EP2509558 A1 EP 2509558A1 EP 10788023 A EP10788023 A EP 10788023A EP 10788023 A EP10788023 A EP 10788023A EP 2509558 A1 EP2509558 A1 EP 2509558A1
Authority
EP
European Patent Office
Prior art keywords
group
branched
straight
alkylene group
polymerizable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10788023A
Other languages
German (de)
English (en)
Inventor
Joachim E. Klee
Helmut Ritter
Sven Pohle
Oliver Elsner
Mareike Bardts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dentsply Detrey GmbH
Original Assignee
Dentsply Detrey GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dentsply Detrey GmbH filed Critical Dentsply Detrey GmbH
Priority to EP10788023A priority Critical patent/EP2509558A1/fr
Publication of EP2509558A1 publication Critical patent/EP2509558A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
    • C08F8/32—Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
    • A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • A61K6/889—Polycarboxylate cements; Glass ionomer cements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F263/00—Macromolecular compounds obtained by polymerising monomers on to polymers of esters of unsaturated alcohols with saturated acids as defined in group C08F18/00
    • C08F263/06—Macromolecular compounds obtained by polymerising monomers on to polymers of esters of unsaturated alcohols with saturated acids as defined in group C08F18/00 on to polymers of esters with polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F267/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated polycarboxylic acids or derivatives thereof as defined in group C08F22/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F267/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated polycarboxylic acids or derivatives thereof as defined in group C08F22/00
    • C08F267/02—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated polycarboxylic acids or derivatives thereof as defined in group C08F22/00 on to polymers of acids or salts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
    • C08F290/12—Polymers provided for in subclasses C08C or C08F
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/14—Esterification
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/34—Introducing sulfur atoms or sulfur-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Definitions

  • the present invention relates to a dental cement composition comprising a polymerizable polyacidic polymer having specific repeating units in the polymer backbone. Moreover, the present invention relates to a process for the preparation of the specific polymerizable polyacidic polymer. Finally, the present invention relates to the use of the specific polymerizable polyacidic polymer having specific repeating units in the polymer backbone and optionally additional crosslinkable groups, in a cement reaction with a reactive particulate glass.
  • a dental cement hardened by a cement reaction involving the specific polymerizable polyacidic polymer and crosslinking involving additional crosslinkable groups, has reduced shrinkage and improved mechanical properties, in particular with regard to flexural strength and fracture toughness.
  • Conventional glass ionomer cements generally contain a powder component containing aluminosilicate, and a liquid component usually containing an aqueous mixture containing a polymer comprising acidic groups such as polyacrylic acid, polymaleic acid, polyitaconic acid, or a copolymer of at least two of these acids, cf. "New Aspects of the Setting of Glass-ionomer Cements,” Wasson et al., Journal of Dental Research; Vol. 72, No. 2, February, 1993; pages 481-483.
  • the most common polymers comprising acidic groups are derived from polyacrylic acid or copolymers of acrylic and itaconic acid (S. Crisp), acrylic acid and maleic acid.
  • the primary reactions which cause the glass ionomer cement to harden is crosslinking based on ionic forces between metal ions released from the glass and the polymer comprising acidic groups.
  • the acids of the glass ionomer cement partially dilute metal cations from the glass structure during setting so that ionic carboxylates of metal cations may be formed during the setting process.
  • Glass ionomers used as dental restoratives have advantages over conventional resin containing composites for several reasons. For example, glass ionomers are tolerant to application on wet surfaces, have low shrinkage and are self-adhesive. Since glass ionomers contain polymers rather than monomers, there is no risk of acrylic monomers leaching out, which can lead to sensitization and allergic reactions. Furthermore, glass ionomers bond chemically to dental hard tissues, and may also provide a beneficial level of fluoride release, which helps to prevent recurrent caries. Accordingly, ionomer cements are widely used in the dental field for filling of a cavity, cementing of crowns, inlays, bridges, or orthodontic bands, lining of a cavity, sealing of a root canal, core construction, and preventive sealing.
  • Resin-modified glass-ionomer cements were introduced with an aim of overcoming the problems associated with the tendency towards brittle fracture of conventional
  • US-A 5,369,142 suggests the use of a specific acidic component, namely copolymers of acryloyi or methacryloyi derivatives of amino acids with acrylic acid or methacrylic acid.
  • WO-A 02/062861 discloses polymer compositions for use in glass ionomer dental restoratives having improved resistance to bending and resistance to twisting, whereby the polymers are formed from at least two specific polymers.
  • WO-A 03/061606 discloses ionomer cements containing amino acids improving the mechanical properties.
  • US-A 4,745,138 discloses radiation-curable low molecular weight partial ester copolymer compositions.
  • the partial esters are produced by esterification of certain copolymers with a hydroxyalkyl acrylyl compound, or an admixture thereof with a monohydric alcohol.
  • the compositions are useful as radiation cross-linkable diluents for radiation-hardenable compositions, particularly in improving adhesion promotion and/or dispersive capabilities of binder resins.
  • the compositions of US-A 4,745,138 are limited to polymerizable acrylyl moieties. Moreover, US-A 4,745,138 does not relate to dental cements,
  • a cement composition comprising (a) a polymerizable polyacidic polymer having repeating units in the polymer backbone, which are represented by the following formula (I):
  • X represents O, S, or NR', whereby R' represents a hydrogen atom or straight or branched C C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 - cycloalkylalkyl group,
  • Y is a moiety of the following formula (II):
  • l_ 2 represents a single bond, a straight or branched Ci-C 6 alkylene group, or a straight or branched C ⁇ C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms;
  • l_3 represents a straight or branched C ⁇ Ca alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms;
  • X' represents O, S, or NR", whereby R" represents a hydrogen atom or a straight or branched Ci-C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -
  • n an integer of from 0 to 6;
  • Ci-C 6 alkylene group represents a single bond, a straight or branched Ci-C 6 alkylene group, a straight or branched C ⁇ Ce alkylenylene group, or a straight or branched C C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms;
  • L 4 represents a single bond, a straight or branched C C 6 alkylene group, a straight or branched C ⁇ Ce alkylenylene group, or a straight or branched C C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms;
  • Z" represents H or -COOH
  • polymerizable monomer having at least one polymerizable functional group
  • the present invention provides a process for preparing a polymerizable polyacidic polymer having repeating units in the polymer backbone, which are represented by the following formula (I):
  • X represents O, S, or NR', whereby R' represents a hydrogen atom or a straight or branched C -C e alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group,
  • Y is a moiety of the following formula (II):
  • L-2 represents a single bond or a straight or branched Ci-C e alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms;
  • L-3 represents a straight or branched C ! -C 3 alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms;
  • X' represents O, S, or NR", whereby R" represents a hydrogen atom or a straight or branched CrC 6 alkyl group, C 3 -C 6 cycloalkyl group, or C - C 8 cycloalkylalkyl group;
  • n an integer of from 0 to 6;
  • Z represents H or -COOH
  • Z' represents H or (CH 2 ) x COOH, wherein x is 0, 1 , or 2,
  • Li represents a single bond, a straight or branched C- ⁇ -C 6 alkylene group, a straight or branched C- ⁇ -C 6 alkylenylene group, or a straight or branched C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms;
  • L 4 represents a single bond, a straight or branched Ci-C 6 alkylene group, a straight or branched C ⁇ -C 6 alkylenylene group, or a straight or branched Ci- C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms, and
  • Z" represents H or -COOH
  • the present invention provides the use of the a polymerizable polyacidic polymer, which is reactive with a reactive particulate glass in a cement reaction, in a cement reaction with a reactive particulate glass.
  • a C -6 alkyl group can include straight or branched alkyl groups having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl and n-hexyl.
  • a cycloalkyl group may be a C 3-6 cycloalkyl group.
  • Examples of the cycloalkyl group can include those having 3 to 6 carbon atoms, for example, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
  • a cycloalkylalkyl group can include those having 4 to 8 carbon atoms.
  • Examples for a cycloalkylalkyl group can include a combination of a straight or branched alkyl group having 1 to 6 carbon atoms and a cycloalkyl group having 3 to 6 carbon atoms.
  • Examples of the cycloalkylalkyl group can for example, include methylcyclopropyl, methylcyclobutyl, methylcyclopentyl, methylcyclohexyl, ethylcyclopropyl, ethylcyclobutyl, ethylcyclopentyl, ethylcyclohexyl, propylcyclopropyl, propylcyclobutyl, and propylcyclopentyl.
  • the alkyl group and the C 3-8 cycloalkyl group may optionally be substituted by one or more members of the group selected from a C -4 alkoxy group and a hydroxy group.
  • Examples for a alkyl group can include linear or branched alkyl groups having 1 to 4 carbon atoms, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl.
  • Examples for an alkoxy group can include linear or branched alkoxy groups having 1 to 4 carbon atoms, for example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, and tert-butoxy.
  • the dental cement composition is preferably an aqueous dental glass ionomer composition comprising the polymerizable polyacidic polymer having specific repeating units in the polymer backbone as the reactive ionomer, a polymerizable monomer having at least one polymerizable functional group as crosslinking agent, a radical polymerization initiator and a reactive particulate glass.
  • the dental cement according to the invention comprises a polymerizable polyacidic polymer having repeating units in the polymer backbone, which are represented by the formula (I) as defined above, which is reactive with the particulate glass in a cement reaction.
  • the repeating units in the polymer backbone, which are represented by the formula (I) are different from repeating units containing acrylyl moieties in that the polymerizable double bond cannot be adjacent to a carbonyl group of an ester linkage according to the present invention.
  • the polymerizable polyacidic polymer may be a linear or branched polymer and may comprises acidic groups.
  • the a polymerizable polyacidic polymer has a polymer backbone and optionally additional pendant groups.
  • the backbone may comprise acidic groups and optionally the pendant groups may comprise acidic groups.
  • the acidic groups are preferably carboxylic acid groups.
  • X represents O, S, or NR', whereby R' represents a hydrogen atom or a straight or branched Ci-C 6 alkyl group, C3-C6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group.
  • X represents O or NR', whereby R' represents a hydrogen atom or a straight or branched Ci-C 6 alkyl group.
  • Y is a moiety of the following formula (II): H 2
  • L 2 represents a single bond, a straight or branched C C 6 alkylene group, or a straight or branched C 1 -C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms.
  • L 2 represents a single bond or a straight or branched d-C6 alkylene group which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms.
  • L 2 represents a single bond.
  • the oxygen atoms an sulfur atoms may be present in as ether groups or thioether groups.
  • the oxygen atoms or sulfur atoms may be present as hydroxyl groups or thiol groups. Ether and thioether groups are preferred.
  • I_3 represents a straight or branched C1-C3 alkylene group which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms.
  • L 3 represents a single bond, a methylene group or an ethylene group.
  • the oxygen atoms an sulfur atoms may be present in as ether groups or thioether groups.
  • the oxygen atoms or sulfur atoms may be present as hydroxyl groups or thiol groups. Ether and thioether groups are preferred.
  • X' represents O, S, or NR", whereby R" represents a hydrogen atom or a straight or branched C- ⁇ -C e alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group.
  • X' represents O, or NR", whereby R" represents a hydrogen atom or a straight or branched d-C 6 alkyl group.
  • m represents an integer of from 0 to 6.
  • m is 0, 1 or 2.
  • Z represents H or -COOH.
  • Z represents COOH.
  • Z' represents H or (CH 2 ) x COOH, wherein x is 0, 1, or 2.
  • any formula (I) represents a single bond, a straight or branched Ci-C 6 alkylene group, a straight or branched C -C 6 alkylenylene group, or a straight or branched C 1 -C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms.
  • a straight or branched C C 6 alkylene group or a straight or branched C ⁇ -C 6 alkylenylene group which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms. More preferably, represents a single bond.
  • oxygen atoms an sulfur atoms may be present in as ether groups or thioether groups.
  • oxygen atoms or sulfur atoms may be present as hydroxyl groups or thiol groups. Ether and thioether groups are preferred.
  • the polyacidic polymer further has repeating units in the polymer backbone, which are represented by the following formula (III):
  • L 4 represents a single bond, a straight or branched C C 6 alkylene group, a straight or branched C C 6 alkylenylene group, or a straight or branched C C 2 o alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms.
  • L 4 represents a single bond or a straight or branched C C 6 alkylene group or a straight or branched C Ce alkylenylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms. More preferably, L 4 represents a single bond.
  • L 4 represents a straight or branched C C 6 alkylene group which includes oxygen and sulfur atoms
  • the oxygen atoms an sulfur atoms may be present in as ether groups or thioether groups.
  • the oxygen atoms or sulfur atoms may be present as hydroxyl groups or thiol groups. Ether and thioether groups are preferred.
  • Z" represents H or -COOH.
  • the polymerizable polyacidic polymer having repeating units in the polymer backbone which are represented by the formula (I) as defined above may be prepared by a process comprising the steps of
  • the copolymerization conditions are not particularly limited.
  • a mixture containing polymerizable monomers is dissolved in a suitable solvent such as distilled water or an aqueous mixture containing a water miscible alcohol such as ethanol, and after flushing with nitrogen, an initiaor molecule such as 2,2'-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride is added.
  • the mixture may contain further monomers as the case requires.
  • Preferred comonomers are acrylic acid, methacrylic acid, itaconic acid, itaconic acid anhydride, maleic acid, maleic anhydride, fumaric acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, phenyl acrylate, benzyl acrylate, phenyl methacrylate, benzyl methacrylate, 2-phenylethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, sty
  • N-hydroxymethylacrylamide hydroxymethyldiacetoneacrylamide, N-(2-hydroxypropyl) ethacrylamide, vinyl acetate, and N-vinylpyrrolidone.
  • the polymerizable compounds may preferably be selected from the group of acrylic acid, methacrylic acid, itaconic acid, itaconic acid anhydride, maleic acid, maleic anhydride, fumaric acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, phenyl acrylate, benzyl acrylate, phenyl methacrylate, benzyl methacrylate, 2-phenylethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, styrene, 8-methyls
  • the reaction time may be from 5 minutes to 120 hours, preferably from 2 to 48 hours in order to complete the reaction.
  • the reaction temperature may be between room temperature and the boiling temperature of the solvent.
  • the reaction product may be isolated by precipitation in acetone.
  • the copolymer may be purified by dissolving in water and lyophilization.
  • the copolymer is reacted with HXY, wherein X and Y are as defined above.
  • the copolymer may be added to a solution of HXY in a suitable solvent such as dichloromethane in the presence of a suitable catalyst such as N-ethyl-diisopropylamine and an inhibitor such as 4-dimethylaminopyridin or 2,6-di-tert-butyl-4-methyl-phenol (BHT).
  • BHT 4-dimethylaminopyridin or 2,6-di-tert-butyl-4-methyl-phenol
  • the reaction is preferably accelerated by irradiation of microwave energy, preferably with an energy of from 1 to 100 watts.
  • the reaction time may be from 1 minute to 12 hours, preferably from 2 minutes to 30 minutes in order to complete the reaction.
  • the reaction temperature may be between room temperature and the boiling temperature of the solvent.
  • the product may be isolated by dissolution in water, and purified by reprecipitation in acetone. Purification may be carried out by lyophilization. It is possible to create a source of additional covalent cross-linking, which imparts additional strength to the ultimate ionomeric cement composition, by reacting a portion of the carboxylic acid groups or carboxylic acid anhydride groups with a further bifunctional monomer containing a carbon-carbon double bond which can take part in an ene-type reaction with -S X H groups present in the composition, and/or with a bifunctional monomer containing a reactive alpha, beta-unsaturated moiety which can take part in Michael addition reaction with the -S X H groups present in the composition, and optionally in a radical polymerization reaction.
  • the linear or branched polymer comprising acidic groups preferably has a molecular weight Mw in the range of from 1 ,000 to 1000,000, more preferably 5,000 to 400,000.
  • the dental cement according to the invention preferably comprises 10 to 80 percent by weight, more preferably 15 to 55 percent by weight, of the linear or branched polymer containing acidic groups, based on the weight of the entire composition.
  • the dental cement according to the invention further comprises a polymerizable monomer having at least one polymerizable functional group as component (b).
  • the polymerizable monomer has at least two polymerizable functional groups.
  • the polymerizable monomer may be selected from the group consisting of vinyl compounds, vinylidene compounds allyl compounds, 1 ,3-diene compounds or polymerizable monomers having at least one groups of the following formula (IV):
  • X' represents O, S, or NR', whereby R' represents a hydrogen atom or a straight or branched C ⁇ Ce alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group, and
  • R represents a hydrogen atom or a straight or branched Ci-C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group.
  • the polymerizable monomer having at least one polymerizable functional group may be selected from diglycidyl methacrylate of bis-phenol A ("bis-GMA"), glycerol diacrylate, glycerol dimethacrylate, ethyleneglycol diacrylate, ethyleneglycol dimethacrylate, polyethyleneglycol diacrylate (where the number of repeating ethylene oxide units vary from 2 to 30), polyethyleneglycol dimethacrylate (where the number of repeating ethylene oxide units vary from 2 to 30 especially triethylene glycol dimethacrylate (“TEGDMA”), neopentyl glycol diacrylate, neopentylglycol dimethacrylate, trimethylolpropane triacrylate, trimethylol propane trimethacrylate, di-, tri-, and tetra- acrylates and methacrylates of pentaerythritol and dipentaerythritol, 1 ,3-butanediol di
  • polymerizable components are divinylbenzene, urethane diacrylates or dimethacrylates, epoxy diacrylates or dimethacrylates and polyol acrylates or methacrylates.
  • the dental cement according to the invention further comprises a radical polymerization initiator as component (c).
  • Suitable radical polymerization initiators may be selected from the following classes of initiator systems:
  • organic peroxide may be benzoyl peroxide or a thermally more stable peroxide such as 2,5-dimethyl-2,5-di(benzolyperoxy)hexane, tert.-butylamyl peroxide, di-(tert.-butyl) peroxide, cumene hydroperoxide, tert.-butylhydroperoxide, tert.butyl-peroxy-(3,5,5-trimethyl hexanoate), tert.-butylperoxy benzoate and tert.butylperoxy-2-ethylhexyl carbonate.
  • the amine compound may be an aromatic amine compound such as DMABE.
  • the peroxide may be selected from benzoyl peroxide, 2,5-dimethyl-2,5-di(benzolyperoxy)hexane, tert.-butylamyl peroxide, di-(tert.-butyl) peroxide, cumene hydroperoxide, tert.-butylhydroperoxide, tert.butyl-peroxy-(3,5,5-trimethyl hexanoate), tert.-butylperoxy benzoate and tert.butylperoxy-2-ethylhexyl carbonate.
  • the reducing agent may be a protected reducing agent in inactive form, which forms an active reducing agent as disclosed in EP 0 951 894.
  • the metal ion may be a salt of a metal or an organometalic compound, which may be present as an acetate, salicylate, naphenoate, thiourea complex, acetylacetonate or ethylene tetramine acidic acid. Suitable metal ions are selected from copper, iron, and silver.
  • a suitable hydroperoxide is hydrogen peroxide.
  • a suitable metal may be selected from iron and copper.
  • Transition metal carbonyl compounds such as dicopper octacarbonyl complexes which may from radical species.
  • Alkylboron compounds such as alkyl boranes. Combinations of peroxdisulphate salts and thiol compounds.
  • the dental cement according to the invention may further comprise a particulate reactive glass.
  • the particulate reactive glass is a powdered metal oxide or hydroxide, mineral silicate, or ion leachable glass or ceramic, that is capable of reacting with an ionomer in the presence of water to form a hydrogel.
  • the particulate glass may contain mixed oxides of Ca, Ba, Sr, Al, Si, Zn, Na, K, B, Ag, or P.
  • particulate reactive glass materials include materials commonly known in the art of glass-ionomer cements such as calcium or strontium-containing and aluminum-containing materials.
  • particulate reactive fillers contain leachable fluoride ions.
  • particulate reactive glasses are selected from calcium aluminosilicate glass, calcium aluminumfluorosilicate glass, calcium aluminumfluoroborosilicate glass, strontium aluminosilicate glass, strontium aluminofluorosilicate glass, strontium aluminofluoroborosilicate glass.
  • Suitable particulate reactive glasses further include metal oxides such as zinc oxide and magnesium oxide, and ion-leachable glasses, e.g., as described in US-A 3,655,605, US-A 3,814,717, US-A 4,143,018, US-A 4,209,434, US-A 4,360,605 and US-A 4,376,835.
  • the particulate glass is a barium and/or strontium fluoroalumosilicate glass.
  • the reactive particulate glass contains silicon, aluminum, zinc, phosphorus and fluorine as essential elements, whereby silicon, aluminum, zinc and phosphorus are contained in the composition predominantly as oxides.
  • the reactive particulate glass may comprise
  • Silica (calculated as Si0 2 ) is preferably contained in the glass composition in an amount of from 10 - 35% by weight. In a more preferred embodiment, silica is contained in an amount of from 20 - 25% by weight.
  • Alumina (calculated as Al 2 0 3 ) is preferably contained in an amount of from 10 - 35% by weight. In a more preferred embodiment, alumina is contained in an amount of from 20 - 25% by weight.
  • the weight ratio between silica and alumina is preferably in a range of from 1.2 to 0.8, more preferably in a range of from 1.15 to 1.0.
  • Zinc oxide (calculated as ZnO) is preferably contained in the glass composition used according to the invention in an amount of from 3 - 30% by weight. In a more preferred embodiment, zinc oxide is contained in an amount of from 13 - 18% by weight.
  • Phosphorus pentoxide (calculated as P 2 0 5 ) is preferably contained in the glass composition used according to the invention in an amount of from 4 - 30% by weight. In a preferred embodiment, phosphorus pentoxide is contained in an amount of from 14 to 18% by weight.
  • Fluoride is preferably contained in the glass composition according to the invention in an amount of from 3 - 25% by weight. In a preferred embodiment, fluoride is contained in an amount of from 4 - 7% by weight.
  • the particulate glass composition of the present invention may further comprise from 18 - 21% by weight of calcium oxide plus strontium oxide.
  • the particulate glass composition preferably essentially does not contain any alkaline metal oxides.
  • the glass composition contains at most 2% by weight, preferably at most 1.5% by weight, of alkaline metal oxides, M 2 0, wherein M is Li, Na, or K.
  • the content of Na 2 0 in the particulate glass is less than 1% by weight.
  • the particulate reactive glass may be surface modified by a surface modifying agent.
  • the modifying compound is capable of reacting with surface atoms of the particulate reactive glass, thereby forming a covalent bond between the surface atoms of the particulate reactive glass and the modifying compound.
  • the surface modifying agent may contain a modifying compound providing a dual function.
  • the modifying compound may contain one or more functional groups capable of taking part in a crosslinking reaction, thereby facilitating the additional crosslinking, whereby the cured cement has improved flexural strength and fracture toughness.
  • the modifying agent may contain one or more modifying compounds.
  • the surface modifying agent contains a hydrolyzable organofunctional silicon compound.
  • the hydrolyzable organofunctional silicon compound may be a compound of one of the following formulae ( ⁇ ), ( ⁇ ) and (IV), or a hydrolysis product thereof
  • X' represents a hydrolyzable group
  • R represents an alkyl, cycloalkyl, cycloalkylalkyl, aralkyl or aryl group
  • L, L ⁇ L", and L'" which may be the same or different represent independent from each other an organic group containing one or more -SxH groups, wherein x is an integer of from 1 to 6;
  • n is an integer of at least 1 ,
  • X is a halogen atom or OR 1 , wherein R 1 is an alkyl, cycloalky, cycloalkylalkyl, aralkyl or aryl group. More preferably, R or R 1 are independently an alkyl group.
  • L, L', L", and L'" may contain -S X H groups, wherein x is an integer of from 1 to 6, preferably 1 , or a polymerizable group, such as a (meth)acrylate group, a (meth)acrylamide group, an allyl group or a vinyl group.
  • L, L", L", and L' may be represented by the following formula:
  • the Z * which may be the same or different and are independent from each other, represent -NR'- , -0-, S or PR', wherein R' represents independently a hydrogen atom, an alkyl group, a cycloalkyl group, an cycloalkylalkyl group, an aralkyl group or an aryl group, L IV represents a linear or branched polymer moiety comprising specific repeating units (I), (II) and/or (III) as defined above in the polymer backbone, or SxH, or a polymerizable double bond such as a (meth)acrylate group, a (meth)acrylamide group, an allyl group or a vinyl group, or a group a group of the following formula (II):
  • l_2 represents a single bond or a straight or branched C C 6 alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms;
  • l_3 represents a straight or branched C ! -C 3 alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms;
  • X' represents O, S, or NR", whereby R" represents a hydrogen atom or a straight or branched C C 6 alkyl group, C 3 -C 6 cycloalkyi group, or C 4 -C 8 cycloalkylalkyi group; m represents an integer of from 0 to 6.
  • L, L', L", and L' may be represented by the following formula:
  • R' which are independent from each other, may be the same or different and represent a hydrogen atom, an alkyl group, a cycloalkyi group, an cycloalkylalkyi group, an aralkyi group or an aryl group,
  • L IV represents a linear or branched polymer moiety comprising acidic groups and having a polymer backbone containing specific repeating units (I) as defined above, or S X H, or a polymerizable double bond such as a (meth)acrylate group, a (meth)acrylamide group, an allyl group or a vinyl group, or a group of the following formula (II) as defined above, o and p, which are independent from each other, may be the same or different and represent an integer of from 1 to 6,
  • q represents an integer of from 0 to 12
  • L, L ⁇ L", and L' may be represented by the following formula:
  • Z** represents an oxygen atom or a sulfur atom
  • L IV represents a linear or branched polymer moiety comprising acidic groups and having a polymer backbone comprising specific repeating units (I) as defined above,
  • o and p which are independent from each other, may be the same or different and represent an integer of from 1 to 6, and
  • q represents an integer of from 0 to 12.
  • modifying compounds contained in the surface modifying agent used in the present invention are 3-mercaptopropyltrimethoxysilane,
  • the surface of the reactive filler may display functional groups such as L IV groups or groups of the formula (II) which may be used for additional curing reactions such as Michael additions of S X H groups to alpha, beta unsaturated ester groups, oxidative coupling reactions of S X H groups, en-type reactions, condensation reactions or radical polymerizations.
  • functional groups such as L IV groups or groups of the formula (II) which may be used for additional curing reactions such as Michael additions of S X H groups to alpha, beta unsaturated ester groups, oxidative coupling reactions of S X H groups, en-type reactions, condensation reactions or radical polymerizations.
  • the surface modifying agent may be used as such or dissolved or dispersed in a suitable solvent.
  • suitable solvent are toluene, methanol, ethanol, isopropanol, and ethylacetate.
  • the particulate reactive glass usually has an average particle size of from 0.005 to 100 pm, preferably of from 0.01 to 40 ⁇ as measured using, for example, by electron microscopy or by using a conventional laser diffraction particle sizing method as embodied by a MALVERN Mastersizer S or MALVERN Mastersizer 2000 apparatus.
  • the particulate reactive glass may be a multimodal particulate reactive glass representing a mixture of two or more particulate fractions having different average particle sizes.
  • the particulate reactive glass may also be a mixture of particles of different chemical composition. In particular, it is possible to use a mixture of a particulate reactive material and a particulate non-reactive material.
  • the aqueous dental glass ionomer composition according to the invention preferably comprises 20 to 80 percent by weight, more preferably 40 to 70 percent by weight, of the reactive particulate glass, based on the weight of the entire composition.
  • the dental cement composition of the present invention may optionally further comprise dispersed nanoparticles comprising grafted linear or branched polymer chains comprising acidic groups, and having a polymer backbone.
  • the polymer backbone may also comprise repeating units in the polymer backbone, which are represented by the formula (I) as defined above, which is reactive with the particulate glass in a cement reaction.
  • the aqueous dental glass ionomer composition according to the invention may comprise from 0 to 75 percent by weight of dispersed nanoparticles based on the weight of the entire composition.
  • the composition contains 5 to 50 percent by weight of dispersed nanoparticles based on the weight of the entire composition.
  • the dispersed nanoparticles have an average particle size of from 1 to 100 nm.
  • the glass ionomer composition of the present invention may optionally further contain a low molecular compound.
  • the low molecular compound may have a molecular weight Mw in the range of from 100 to 5000, preferably in the range of from 200 to 2000.
  • the low molecular compound may contain one or more -SxH groups, wherein x is an integer of from 1 to 6.
  • the low molecular compound may contain moieties which may react with the -SxH groups present in the glass ionomer composition in an ene-type reaction or a Michael addition reaction.
  • suitable polythiol compounds are PEG dithiol (e.g.
  • the glass ionomer composition of the present invention may comprise -S X H groups, wherein x is an integer of from 1 to 6, which crosslink the particulate glass and/or the linear polymer comprising acidic groups and/or the optionally dispersed nanoparticles and/or the low molecular compound.
  • the -S X H groups, wherein x is an integer of from 1 to 6, are sulfane or polysulfane groups, wherein x is preferably 1 to 3.
  • the -S X H groups are preferably thiol groups (-SH), disulfane groups (-S-SH) or trisulfane groups (-S-S-SH).
  • -S X H groups are thiol groups which may be primary or secondary thiol groups.
  • the -S X H groups When the crosslinking reaction is based on an oxidative coupling of -S X H groups, the -S X H groups, wherein x is an integer of from 1 to 6, may be present on any of the reactive particulate glass, the linear or branched polymer containing acidic groups, the optional dispersed nanoparticles, or on the optional low molecular compound present in the composition.
  • oxidative coupling is metal catalyzed oxidative coupling in the presence of an oxidizing agent.
  • the composition contains preferably a transition metal ions and an oxidizing agent. Examples of the transition metal ions are iron and manganese ions.
  • the composition preferably contains an oxidizing agent.
  • oxidizing reagent examples include peroxides such as hydrogen peroxide or a peroxide compound commonly used as free-radical polymerization initiators.
  • the -S X H groups are present exclusively on either the reactive particulate glass, the linear or branched polymer containing acidic groups, or the optional dispersed nanoparticles.
  • the -SxH groups are present exclusively on an optional additional low molecular component present in the composition, then it will be necessary that the reactive particulate glass, the linear or branched polymer ⁇ ,, ⁇ . ⁇ z acidic groups, and/or the optional dispersed nanoparticles contain reactive carbon-carbon double bonds which may take part in an ene-type reaction or a Michael addition with the -S X H groups.
  • the -S X H groups may be present on the linear or branched polymer containing acidic groups.
  • the -S X H groups are present on at least two members selected from the group of either the reactive particulate glass, the linear or branched polymer containing acidic groups, the optional dispersed nanoparticles, or the optional low molecular compound. Any other member selected from this group may contain reactive carbon-carbon double bonds which may take part in an ene-type reaction or the Michael addition with the -S X H groups.
  • each of the members selected from the group of the reactive particulate glass, the linear or branched polymer containing acidic groups, the optional dispersed nanoparticles, or the optional low molecular compound contains either -S X H groups or reactive carbon-carbon double bonds which may take part in an ene-type reaction with the -S X H groups.
  • the -S X H groups may crosslink the particulate glass and/or the linear or branched polymer containing acidic groups and/or the optionally dispersed nanoparticles by oxidative coupling.
  • the sulfane or polysulfane groups of the aqueous dental cement according to the invention crosslink the particulate glass and/or the linear polymer containing acidic groups and/or the optionally dispersed nanoparticles in the absence of oxygen.
  • the -S X H groups in the aqueous dental cement according to the invention crosslink by an -S X H ene-reaction or a Michael addition.
  • the dental cements of the present invention may further contain catalysts for the
  • cross-linking reaction a retarder, stabilizers, non-reactive fillers, solvents, pigments, nonvitreous fillers, free radical scavengers, polymerization inhibitors, reactive and
  • nonreactive diluents such as to enhance reactivity of fillers, rheology modifiers, and surfactants (such as to enhance solubility of an inhibitor e. g., polyoxyethylene).
  • Suitable catalysts for the cross-linking reaction may comprise metal cations, metal complexes and/or metal particles such as metal powder or metal colloids, either alone or in combination with an oxidizing agent such as oxygen, a peroxide and/or an oxidizing metal complex.
  • the catalyst and oxidizing agent may comprise the same material.
  • the metal cations, metal complexes and/or metal particles may comprise iron, nickel, copper, cobalt or platinum atoms, or the corresponding ions thereof.
  • the peroxide may comprise hydrogen peroxide, urea-hydrogen peroxide, ethylmethylketone peroxide, or benzoylperoxide.
  • Suitable retarders are low molecular weight compounds having multiple carboxylic acid groups such as tartraic acid.
  • Suitable stabilizers may be selected from reducing agents such as vitamin C, inorganic sulfides and polysulfides and the like.
  • Suitable non-reactive fillers may be selected from fillers currently used in dental restorative compositions.
  • the filler should be finely divided and preferably has a maximum particle diameter less than about 100 pm and an average particle diameter less than about 10 pm.
  • the filler may have a unimodal or polymodal (e.g., bimodal) particle size distribution.
  • the filler can be an inorganic material. It can also be a crosslinked organic material that is insoluble in the polymerizable resin, and is optionally filled with inorganic filler.
  • the filler can be radiopaque, radiolucent or non-radiopaque.
  • non-reactive inorganic fillers are naturally-occurring or synthetic materials such as quartz, nitrides such as silicon nitride, glasses derived from, for example Ce, Sb, Sn, Zr, Sr, Ba and Al, colloidal silica, feldspar, borosilicate glass, kaolin, talc, titania, and zinc glass, and submicron silica particles such as pyrogenic silicas.
  • non-reactive organic filler particles examples include filled or unfilled pulverized polycarbonates or polyepoxides.
  • the surface of the filler particles is treated with a coupling agent in order to enhance the bond between the filler and the matrix.
  • suitable coupling agents include gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, and the like.
  • Suitable solvents or nonreactive diluents include alcohols such as ethanol and propanol.
  • Suitable reactive diluents are alpha, beta unsaturated monomers for providing altered properties such as toughness, adhesion, and set time, e.g., 2-hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate.
  • HEMA 2-hydroxyethyl methacrylate
  • diallyl compounds such as diallyl amine.
  • the mixed but unset cements of the invention will contain a combined weight of about 0.5 to about 40%, more preferably about 1 to about 30%, and most preferably about 5 to 20% water, solvents, diluents and alpha, beta-unsaturated monomers, based on the total weight (including such water, solvents, diluents and alpha, beta-unsaturated monomers) of the mixed but unset cement components.
  • a suitable free radical scavenger is 4-methoxyphenol.
  • Suitable polymerization inhibitors may be selected from hydroxytoluene, butylated hydroxytoluene (BHT), hydroquinone, 1 ,4-benzoquinone, tert-butylpyrocatechol,
  • the amount of inhibitor may be selected from 0.001 to 2% and preferably from 0.02 to 0.5% based on the total weight of the copolymer/comonomer/water mixture.
  • External energy may alternatively or additionally be employed in order to crosslink the -SxH groups by oxidative coupling.
  • Sources of external energy may be selected from radiative energy sources such as thermal energy sources, ultrasound energy sources, and/or light energy sources such as ultraviolet lamps or visible lamps.
  • the dental cement may additionally comprise photoinitiators and/or photosensitizers such as molecular oxygen, alpha-diketones, orthoquinones, organic dyes, fluorescent dyes or colorants, and/or azo-compounds such as azobisisobutyronitrile and 1 ,1'azobis(cyclohexanecarbonitrile).
  • the dental cement may be used in a dental ionomer cement.
  • Two major classes of such cements may be distinguished.
  • the first class relates to conventional glass ionomers employing as their main ingredients a homopolymer or copolymer of an
  • alpha, beta-unsaturated carboxylic acid e.g., poly acrylic acid, copoly (acrylic, itaconic acid), etc.
  • a modified particulate reactive filler such as modified fluoroaluminosilicate glass, water, and a chelating agent such as tartaric acid.
  • Such dental ionomer cements may be supplied in powder/liquid formulations that are mixed just before use. The mixture will undergo self-hardening in the dark due to an ionic reaction between the acidic groups of the polycarboxylic acid and cations leached from the glass as well as the crosslinking reaction based on the -SxH groups.
  • the second major class relates to resin-modified glass ionomer cements.
  • a resin-modified glass ionomer cement employs a modified particulate reactive filler obtainable according to the process of the present invention, whereby the organic portion of an resin-modified glass ionomer cements is different.
  • the polycarboxylic acid is modified to replace or end-cap some of acidic repeating units with pendent curable groups and a photoinitiator is added to provide a second cure mechanism, e.g., as in US-A
  • the cement includes a polycarboxylic acid, an acrylate or methacrylate-functional monomer and a photoinitiator, e.g., as in Mathis et al., "Properties of a New Glass lonomer/Composite Resin Hybrid Restorative", Abstract No. 51 , J.
  • Resin-modified glass ionomer cements may be formulated as powder/liquid or paste/paste systems, and contain water as mixed and applied. They harden in the dark due to the ionic reaction between the acidic groups of the polycarboxylic acid and cations leached from the glass as well as the crosslinking reaction of the particulate glass and/or the linear polycarboxylic acid and/or the optionally dispersed nanoparticles when the pH of the aqueous dental cement is at least 6 at the end of the main setting reaction of the linear polycarboxylic acid reactive with the particulate glass. Moreover, resin-modified glass ionomer cements also cure on exposure of the cement to light from a dental curing lamp.
  • a dental ionomer cement is prepared by mixing the ionomer with the particulate reactive filler and optionally nanoparticles in the presence of water.
  • the components of the ionomer cement system can be combined (such as by mixing or blending) in a variety of manners and amounts in order to form the ionomer cements of the present invention.
  • a concentrated aqueous solution of the ionomer may be mixed with the modified particulate reactive filler and optionally further components at the time of use. The resultant combination of ionomer, modified particulate reactive filler and water allows the setting reaction to begin.
  • the ionomer and the modified particulate reactive filler are provided as a freeze-dried or lyophilized powdered blend under conditions in which there is not sufficient water to allow the setting reaction to proceed. Such systems can then be combined with water at the time of use in order to begin the setting reaction. Once the setting reaction has begun, the resultant mixture may be formed into its desired shape, followed by curing and allowing the mixture to fully harden.
  • the weight-to-weight ratio of the ionomer to water is from about 1 : 10 to about 10: 1.
  • the concentration of ionomer in water ranges from 25 to 90 % by weight, and preferably from 40 to 65 % by weight.
  • the resultant aqueous solution has a ratio of polymer to liquid generally ranging from about 1.5 to 8.
  • the reaction mixture may also include a retarding or modifying agent such as tartaric acid, for adjusting the working time and a setting time, respectively, when preparing the cement as described in US-A 4,089, 830, US-A 4, 209,434, US-A 4,317, 681 and US-A 4,374, 936.
  • a retarding or modifying agent such as tartaric acid
  • an increase in working time results in an increase in setting time as well.
  • the "working time” is the time between the beginning of the setting reaction when the ionomer and modified particulate reactive filler are combined in the presence of water, and the time the setting reaction proceeds to the point when it is no longer practical to perform further physical work upon the system, e.g. spatulate it or reshape it, for its intended dental or medical application.
  • the "setting time” is the time measured from the beginning of the setting reaction in a restoration to the time sufficient hardening has occurred to allow subsequent clinical or surgical procedures to be performed on the surface of the restoration.
  • the modified particulate reactive glass behaves like a base and reacts with the acidic ionomer to form a metal polysalt which acts as the binding matrix (Prosser, J. Chem. Tech. Biotechnol. 29 : 69-87(1979)). Moreover, due to the presence of -SxH groups, crosslinking of the particulate glass and/or the linear polycarboxylic acid and/or the optionally dispersed nanoparticles when the pH of the aqueous dental cement is at least 6 during the reaction of the linear polycarboxylic acid reactive with the particulate glass takes place.
  • the setting reaction is therefore characterized as a dual chemical cure system that proceeds automatically in the presence of water.
  • the cement sets to a gel-like state within a few minutes and rapidly hardens to develop strength. Further reactions are polymerisation reactions and polyaddition reactions.
  • the dental composition is a multi-pack, preferably a two-pack composition.
  • the composition may be a paste/paste system, a powder/liquid system, or a liquid/paste system.
  • the composition is designed so as to avoid premature curing of the components.
  • the reactive inorganic filler component and any acid group containing component must be formulated so as to avoid a premature cement reaction.
  • the reactive inorganic glass is contained in a first pack and any acid group containing
  • the first pack may be a powder or a paste.
  • the second pack may be a liquid or paste.
  • the first pack is a powder comprising the reactive inorganic filler and a solid polyacidic polymer such as polyacrylic acid, and the second pack is a paste or liquid and contains a further acid group containing component.
  • the ratio of powder to liquid affects the workability of the mixed ionomer cement systems. Weight ratios higher than 20:1 tend to exhibit poor workability, while ratios below 1 :1 tend to exhibit poor mechanical properties, e. g., strength, and hence are not preferred. Preferred ratios are on the order of about 1 : 3 to about 6: 1 and preferably about 1 : 1 to 4: 1.
  • Example 1 Crosslinking of ally) modified PAA (136 kDa) with poly( ethylene glycol) diacrylate
  • Biaxial flexural strength was determined using disk shaped specimens of 20 mm diameter and 1 mm thickness.

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Abstract

La présente invention concerne une composition de ciment dentaire comprenant (a) un polymère polyacide polymérisable qui présente des unités récurrentes dans le squelette du polymère, représentées par la formule (I). Dans ladite formule, X représente O, S, ou NR', R' représentant un atome d'hydrogène ou un groupe alkyle en C1 à C6 linéaire ou ramifié, un groupe cycloalkyle en C3 à C6, ou un groupe cycloalkylalkyle en C4 à C8 ; Y représente un radical de la formule (II) suivante (dans laquelle L2 représente une liaison simple, un groupe alkylène en C1 à C6 linéaire ou ramifié, ou un groupe alkylène en C1 à C2O linéaire ou ramifié qui comprend 1 à 8 atomes choisis parmi des atomes d'oxygène et de soufre ; L3 représente un groupe alkylène en C1 à C3 linéaire ou ramifié, qui peut éventuellement comprendre 1 à 4 atomes choisis parmi des atomes d'oxygène et de soufre ; X' représente O, S, ou NR », R » représentant un atome d'hydrogène ou un groupe alkyle en C1 à C6 linéaire ou ramifié, un groupe cycloalkyle en C3 à C6, ou un groupe cycloalkylalkyle en C4 à C8 ; et m représente un nombre entier de 0 à 6 ; Z représente H ou -COOH ; Z' représente H ou (CH2)XCOOH, x valant 0, 1, ou 2 ; L1 représente une liaison simple, un groupe alkylène en C1 à C6 linéaire ou ramifié, un groupe alkylénylène en C1 à C6 linéaire ou ramifié, ou un groupe alkylène en C1 à C2O linéaire ou ramifié qui comprend 1 à 8 atomes choisis parmi des atomes d'oxygène et de soufre ; et les unités récurrentes dans le squelette du polymère sont représentées par la formule (III) suivante, dans laquelle L4 représente une liaison simple, un groupe alkylène en C1 à C6 linéaire ou ramifié, un groupe alkylénylène en C1 à C6 linéaire ou ramifié, ou un groupe alkylène en C1 à C2O linéaire ou ramifié qui comprend 1 à 8 atomes choisis parmi des atomes d'oxygène et de soufre, et Z » représente H ou -COOH. Ladite composition comporte également (b) un monomère polymérisable doté d'au moins un groupe fonctionnel polymérisable et (c) un initiateur de polymérisation de radical.
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