DE2301444C3 - - Google Patents

Description

definitely. The pack usually contains 0.5 to ke.t 14 kg pounds. _{acrylic acid} solution with a

In this respect, this is similar to the powder process used according to GB-PS 11 39 430 produced.

23 Ol 444

Then it became a powder with 8 weight percent stannous fluoride according to the information in Example 1 hergistellt

In the case of mixtures with a powder / liquid ratio of 0.95 g / 0.50 g, the components reacted and resulted in a cement with a compressive strength of 750 kg / cm ² and a diametrical compressive strength of 88 kg / cm ² .

Without the addition of the tin fluoride to the powder, the set cement had a compressive strength of 500 kg / cm ² and a diametrical compressive strength of 35 kg / cm *.

Further examples result from the following table (examples 4 to 9):

at proceedings Conc Conc strength game after tration of tration of the in kg / cm ⁵ No. example Polyacrylic Tin fluoride acid in in Diametral pressure Weight% Wt% pressure 4th 1 42 2 795 126 5 1 42 4th 885 130 6th 3 35 2 630 75 7th 3 35 4th 715 80 8th 1 42 12th 1340 155 9 3 30th 8th 640 470

A comparison test was used to demonstrate the surprising technical effect of the claimed mixture carried out according to Example 3 using calcium fluoride, and there were achieved the following results:

1. Using 5% stannous fluoride at a powder / liquid ratio of 2: 1, a Strength value of 850 kg / cm *, without the addition of tin fluoride for a powder / liquid mixture

ratio of 2.6: 1 achieves a strength value of only 650 kg / cm ⁸ .

2. Using 5% calcium fluoride and a powder / liquid ratio of
2.3: 1 finally became a strength value of

obtained only 460 kg / cm ² , i.e. a reduction in the strength value by almost half compared to tin fluoride.

The technical effect and thus also the proof of the existence of what is required for patenting Invention lies in the special selection of the addition of tin fluoride to the mixture, because the It is believed by those skilled in the art that additives generally reduce the strength of surgical cements decrease, while tin fluoride just had the opposite effect.

Claims (1)

> Z ¹ component in the production of conventional zinc phospbatzemente, «but _r and this is also in _Claim : Describe the patent mentioned above - purposeful ^ ^ t niäßis further deactivated by up to 40 hours \ \ Cement mix for surgical purposes on p. ^^^ for example to about 100O = C. The tin based on zinc oxide, characterized ge ISIN 5 gra, ^ £ _{or or nac} h inscribes the deactivation that they vorzu 2 weight percent, ^ - nu ^ _{Γ (1, but} usually after 2 to 12 weight percent, Zmnfluond sawn ^ rieiDt ^ ^: Subjected to zinc oxide contains _Def i _n koxydbestandteil _Z can be part of the <o be polyacrylic acid in dry powder form. The ' equilibrium of the polyacrylic acid is achieved "Cement produced as an aqueous component, ent- In the present case, in a more dilute manner - u f form It was found that the polyacrylic The invention relates to a cement mixture which is _{easy to use in the} dilute aqueous poly- Base of zinc oxide for surgical purposes, msDe- 15 * · ^ _{8 under the} conditions of a high-speed especially for use in dentistry. Vibration as it normally occurs when mixing Cements of this type essentially contain a νκ > _{m and} amalgams are used, aqueous polyacrylic acid and zinc oxide. Generally üenta contains the cement, this loading is available commercially Aunos 2 _ementmischun g according to the invention, and the constituents in separate containers, the two-piece to a ras _vacrv i _s äurekomponente can in a kung are compiled, the constituents of _{which are introduced into rjj R} , in which they are mixed indirectly before use to form a rni _n , but outside of each other plastic, fast-hardening mass together: ws B ^ ^^ ^ ^ _mix be mixed. As is known, polyacrylic acid forms ° " ^u " ™ _u f _h ⁸ _; ^ _{Njedere initial viscosity of} a replacement for part or all of the phosphorus * ₅ ertoroer _{eües is Fa "e such packages} acid, which in conventional dental cement J ^ jj ^ _wanschen swert, as example, is used in. . , _nB .pe 12 35 668 is described. From GB-PS 11 39 430 it is known that in poly Explanatory note whether _Erlä of the invention are carboxylate cements of this type other MegBtataj «** ^^ X _Beis p _iele indicated, oxides, especially magnesium oxide, bismuth oxide, 30 nacnioigci Calcium phosphate and / or calcium fluoride included examples love. . . . 1 \ Ρς was a polyacrylic acid solution with a It has now been found that the Fest.gke.tse.gen- U «corresponds to an average month consider shafts of the set cement V · «^^^ T ₀₀₀₀ and a concentration can be increased by incorporating tin 35 ' ^ekula ₄ ^r | ^e G _{e 'wicntsprozent (w} / w) by Lösungspolyfluorid in an amount of at least 2 Oewicnts- vot1 _Acry lsäuremonoraeren under application Percent, based on the zinc oxide. Zweckmaß.g ^m f ^"S ™ _{v r} S ens according to the GB-PS 11 39 430 rises over the stannous fluoride is not 12 weight percent of the method like dung of zinc oxide, and it was further found that 100 parts of zinc oxide an amount between 5 to 10 percent by weight of the 40 ^^ 'e _{parts of silicon dioxide} powdery constituent of the cement especially ge ^^^ ", iaiiyd erhiut to a dispossessed is. . c «r ^ rin» nte to achieve responsiveness. This The invention therefore relates to a cement mixture g ^ ^e ° _rfe ^R £ nn ° ζ J ₈ percent by weight stannous fluoride for surgical use based on zinc oxide, data powder was Oann characterized by that they j _{"mixture with} a powder-Flüssigkeitsvorzugs.eise 2 to 12 Ge chtsprozent 2 weight percent, 45 g ^e, Z.nnfluond, Be, d ^ he Mjsch g _g ^. ^ ^ based on the zinc oxide, containing . _{A cement} mixture with a The effect of the tin fluid in the cement is very nenten _f Una iuarx diametral-specific. A number of other fluorides including printing products of ν / υ κ _{β /} Calcium fluoride has been investigated, but you need 50 i ^^ J ^ de zÄmd. there is no comparable effect to the Pd relation. This also applies to the pressure _{resistance of the OtagdenZujatz} S ^ ÖSSS ^^ SÄ? - ^ Diametial compressive strength lagbei