WO2014066963A1 - Modified nylon mesh for structural reinforcement of dental prostheses and method for producing same - Google Patents

Modified nylon mesh for structural reinforcement of dental prostheses and method for producing same Download PDF

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Publication number
WO2014066963A1
WO2014066963A1 PCT/BR2013/000423 BR2013000423W WO2014066963A1 WO 2014066963 A1 WO2014066963 A1 WO 2014066963A1 BR 2013000423 W BR2013000423 W BR 2013000423W WO 2014066963 A1 WO2014066963 A1 WO 2014066963A1
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WO
WIPO (PCT)
Prior art keywords
polyamide
nylon mesh
structural reinforcement
mesh
modified
Prior art date
Application number
PCT/BR2013/000423
Other languages
French (fr)
Portuguese (pt)
Inventor
Tarcísio José DE ARRUDA PAES JÚNIOR
Fernanda DE CÁSSIA PAPAIZ GONÇALVES
Estevão TOMOMITSU KIMPARA
Natalia DE PASCHÔA NAVARRIAS
Marco Aurélio DE PASCHÔA
Original Assignee
Universidade Estadual Paulista "Júlio De Mesquita Filho"
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.)
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Publication date
Priority to BR102012028119-8A priority Critical patent/BR102012028119A2/en
Priority to BRBR1020120281198 priority
Application filed by Universidade Estadual Paulista "Júlio De Mesquita Filho" filed Critical Universidade Estadual Paulista "Júlio De Mesquita Filho"
Publication of WO2014066963A1 publication Critical patent/WO2014066963A1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/34Silicon-containing compounds
    • C08K3/36Silica
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/01Palates or other bases or supports for the artificial teeth; Making same

Abstract

The invention of a modified nylon mesh for structural reinforcement of dental prostheses is described, said modified nylon mesh comprising polyamide fibres and 0.3%-0.5% v/v silicon dioxide (SiO2), which enables chemical binding between the acrylic resin and the polyamide mesh in order to increase the strength of the resin/polyamide complex in said dental prosthesis.

Description

MODIFIED NYLON MESH FOR STRENGTHENING OF DENTAL IMPLANTS AND STRUCTURAL PROCEDURE FOR OBTAINING

FIELD OF THE INVENTION

The present invention describes a nylon mesh, particularly a modified polyamide, for structural reinforcement of dental prostheses and their obtaining process. More specifically comprises a polyamide fabric with the incorporation of controlled percentage of silica to allow chemical bonding to the acrylic resin of polyamide mesh, potentially useful for application in prosthetic parts, orthopedic and orthodontic appliances and removable mouthguards.

BACKGROUND OF THE INVENTION

In dentistry, the mucossuportadas dentures (dentures) are made of acrylic resin, a very versatile material, with cost-effective and easy clinical and laboratory application, and meet physical requirements and minimum biological for use in dentistry. However, these acrylic resin prostheses present risk of fractures due to the final features that prosthetic devices assume, and limitations that imposes itself clinical condition, resulting often in decreased longevity of the prosthesis.

Thus, high incidence of fractures and the constant need to repair the dentures have driven the development of materials and techniques that enable improving the flexural strength and impact (Bastos, LGC flexural strength evaluation of elastic modulus and type of fracture of an acrylic resin for temporary restorations -.. effect of several ribs 131f Dissertation University of São Paulo, Bauru School of Dentistry, Bauru, 2003).. -

Accordingly, studies have been made on the use of reinforcing fibers to improve the mechanical properties of prostheses [(HD Stipho Repair of acrylic denture base resin reinforced with glass fiber Prosthet Dent J 1998 Nov; 80 (5):.. 546- 50); (Kanie T, K. Fujii, Arikawa H., Inoue K. impact strength and Flexural properties of denture base polymer reinforced with woven glass fibers Dent Mater 2000 seas; 16 (2):.. 150-8)].

In an attempt to increase the flexural strength and reducing the risk of acrylic resins fractures, glass fibers, polyamide mesh and wire meshes have been incorporated in the resin mass to obtain better results (Perez LEC Influence of adding reinforcement and cycling mechanics on the impact resistance of resins for relining base imediato.Tese presented to the Post-Graduate Program in Oral Rehabilitation. - Implant Area, Faculty of Dentistry of Araraquara, São Paulo State University "Júlio de Mesquita Filho UNESP 2011. ). These surveys assess a variety of reinforcement materials, however, the dental market is still deficient products that combine practicality and earnings conditions in material strength.

Newell (Newell JA Foundations of Modern Materials Science and Engineering Rio de Janeiro:.. LTC 2010) classifies carbon reinforcement fibers (aesthetically poor), aramids (exhibit lack of adhesion), polyethylene (exhibit good adhesion), fiber glass (application range), polyamide (accession difficult when the fibers are intertwined).

According Newell, nylon fibers have good strength and durability characteristics justified by amide hydrogen bonds with polar groups present in the structure.

Also, it should be taken into account polyamide fiber structure, its orientation relative to the effect of the applied force, the amount of added fiber and the adhesion of the matrix (Vallittu, PK Comparison of two different silane compounds used for Improving adhesion between fibers and acrylic denture base material J Oral Rehabil 1993;. v. 20, No 5, pp 533-9,.... Jagger et al D. The effect of the addition of poly (methyl methacrylate) fibers on some properties of high strength heat-cured acrylic resin denture base material J Oral Rehabil. 2003;. v. 30, No 3, page 231-5)...

The prior art discloses metal reinforcement fabrics currently accepted bit, fiberglass and polyamide fabrics, the latter having a certain limitation on the desired effect of improvement in mechanical strength of acrylic resin. elderly people that use removable prosthetic devices such as dentures, because often their own physical condition, determine fractures of parts from falls during handling or during use by the weakening acrylic resin over time.

Thus, it is object of the present invention a modified polyamide mesh for structural reinforcement prophetic parts, orthopedic and orthodontic removable appliances and mouth guards, said polyamide fiber by incorporating controlled percentage of silica (SI0 2) to allow chemical bonding acrylic resin to the polyamide mesh, providing a grid of polyamide and desirable thick single body, facilitating the penetration of the acrylic resin in the grid, increasing the mechanical strength.

SUMMARY The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses for a body filler dentures.

The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses for reinforcing pharyngeal buccal extensions buccal maxillofacial prosthesis.

The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses for the repair and removable partial dentures.

The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses of the type prostheses protocol on temporary fixed prostheses and implants acrylic resin.

The invention provides a modified polyamide mesh for structural reinforcement of orthopedic and orthodontic removable appliances and mouth guards for use in sport.

The invention provides a modified polyamide mesh for structural reinforcement dental prosthesis that minimizes occurrences of fractures and constituting an inert material when in contact with the oral tissues.

The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses which allows easy handling for dental technicians, being resistant to chemical or thermal stress that technical maneuvers can cause the material.

The invention provides a modified polyamide mesh for structural reinforcement of dental prostheses comprising incorporating silica polyamide, allowing chemical bonding of acrylic resin W

5

Polyamide mesh together to increase the strength of the resin / polyamide.

The invention provides a modified polyamide mesh for structural reinforcement of dental implants which allows the knitting producing polyamide in a single body, and desirable thickness, allowing the mesh to present a larger grid, facilitating the penetration of the acrylic resin between their spaces which It contributes greatly to the increase in the mechanical strength of acrylic resin.

BRIEF DESCRIPTION OF THE FIGURES

It seems 1 shows schematic drawing of polyamide fabric showing the shaped openings between the fibers.

2A and 2B show images of scanning electron microscopy of polyamide mesh silica.

DETAILED DESCRIPTION OF THE INVENTION

The modified polyamide mesh for structural reinforcement of dental prosthesis, object of the present invention comprises a composition comprising polyamide fiber and silicon dioxide (SI0 2) in a proportion of 0.3% to 0.5% v / v of the composition .

The silicon dioxide incorporated in the polyamide mesh allows chemical bonding of acrylic resin to polyamide fabric, increasing the overall resistance of the resin / polyamide.

The modified polyamide knitted obtaining process comprises in a first step a mixture of polyamide fiber and silicon dioxide.

The mixture obtained is kept at a temperature between 65 and 75 ° C in order to reduce as much moisture can cause the material gases that disturb the injection and filling of the mold cavity.

Then the part is injected at a temperature between 235 and 265 ° C, injection pressure of between 198 and 202 MPa, providing a controlled thickness and mesh with openings (11) between the fibers (10) is preferably between 2.2 mm and 3.2 mm.

Preliminary studies were performed to evaluate the performance of acrylic resins such as polyamide reinforced by fibers. Therefore, one was used termoativada acrylic resin (RAAT) in microwave. specimens were used in bar shape in the dimensions of 20x10x3,3mm (n = 9) analyzed for the flexural strength in the following situations: G1 - RAAT without polyamide fiber, G2 RAAT polyamide fiber, G3, - fiber RAAT polyamide modified silica.

For the observation of dimensional change, comparison was performed of the distance between predetermined points on artificial dentures teeth positioned in the maxillary arch (n = 6) subjected to preliminary thermal cycling. In the analysis of dimensional change, capturing occlusal images before and after polymerization of the denture and testing for program Image Tool and the results given in millimeters was made. The values ​​obtained were collected and subjected to ANOVA and Tukey (5%).

TABLE 1: Mean values ​​and standard deviations for the dimensional stability test

Figure imgf000008_0001

For the evaluation of flexural strength at three points used was a universal testing machine and the results reported in megapascals (MPa).

TABLE 2: Mean values ​​(MPa) and standard deviations for the flexural test

Figure imgf000009_0001

The variance analysis and Tukey's test at 5% showed a significant difference between all groups, the groups being reinforced with mesh (G2 and G3) showed the best results.

Regarding the dimensional stability, the results showed statistical difference between the values ​​before and after polymerization measured in millimeters for the groups tested in the molar region, indicating that the groups containing fibers (G2 and G3) showed less dimensional change of acrylic resin as shown in table 1.

Claims

1. nylon mesh to reinforce MODIFIED STRUCTURAL DENTAL IMPLANT characterized by regularly spaced openings have uniform, square or circular cross-section with side or diameter measuring between 2.2 mm and 3.2 mm.
2. nylon mesh to reinforce MODIFIED STRUCTURAL DENTAL IMPLANT characterized in that the fibers that line the openings have a thickness between 0.55 1 mm and 20 mm.
3. nylon mesh MODIFIED STRUCTURAL REINFORCEMENT FOR DENTAL PROSTHESES characterized in that the fibers are preferably composed of polyamide, in which are homogeneously dispersed particles of silicon dioxide (SI0 2) preferential concentration of 0.3% to 0, 5% v / v.
4. PROCEDURE FOR OBTAINING nylon mesh for structural reinforcement modified dental prosthesis comprising the steps of:
a) mixing of the nylon fiber and silicon dioxide from 0.3 to 0.5% v / v of the composition;
b) maintaining the mixture at a temperature between 65 and 75 ° C;
c) injecting the mixture at a temperature around 235 and 265 ° C with pressure between 198 and 202 MPa.
PCT/BR2013/000423 2012-11-01 2013-10-17 Modified nylon mesh for structural reinforcement of dental prostheses and method for producing same WO2014066963A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR102012028119-8A BR102012028119A2 (en) 2012-11-01 2012-11-01 modified nylon mesh for structural reinforcement of dental prostheses and process for obtaining
BRBR1020120281198 2012-11-01

Publications (1)

Publication Number Publication Date
WO2014066963A1 true WO2014066963A1 (en) 2014-05-08

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PCT/BR2013/000423 WO2014066963A1 (en) 2012-11-01 2013-10-17 Modified nylon mesh for structural reinforcement of dental prostheses and method for producing same

Country Status (2)

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BR (1) BR102012028119A2 (en)
WO (1) WO2014066963A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687451B1 (en) * 1994-05-16 2001-08-08 DENTSPLY DETREY GmbH Method of making a dental prosthesis and curable system
US6599125B1 (en) * 1999-08-27 2003-07-29 University Of Connecticut Prefabricated components for dental appliances

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687451B1 (en) * 1994-05-16 2001-08-08 DENTSPLY DETREY GmbH Method of making a dental prosthesis and curable system
US6599125B1 (en) * 1999-08-27 2003-07-29 University Of Connecticut Prefabricated components for dental appliances

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOHN, J. ET AL.: "Flexural strength of heat- polymerized polymethyl methacrylate denture resin reinforced with glass, aramid, or nylon fibers", THE JOURNAL OF PROSTHETIC DENTISTRY, vol. 86, no. 4, 2001, pages 424 - 427 *
MAHFUZ H. ET AL.: "Reinforcement of nylon .6 with functionalized silica: nanoparticles for enhanced tensile strength and modulus", NANOTECHNOLOGY, vol. 19, no. 44, 2008, pages 445702 *

Also Published As

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BR102012028119A2 (en) 2014-10-29

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