Josna Susan, Joy (2012) Comparison of Mechanical Properties, Physical Properties & Biocompatibility of Four Different Denture Base Resins: An In Vitro Study. Masters thesis, Rajas Dental College & Hospital, Tirunelveli.
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Abstract
INTRODUCTION: Poly (methy1 methacrylate) polymers were introduced as denture base materials in 1937 as vulcanite62. Artificial dentures should be made of a material which is strong, rigid & biocompatible in order to serve successfully for a reasonable length of time. Various materials like wood, ivory, ceramics, metals, metal alloys have been used in relatively thin sections in early years of dentistry. Metal & metal alloys used in denture construction display excellent mechanical properties & can be used in relatively thin sections. However it is easier & cheaper to construct prosthesis in non-metallic materials. Also, the color & texture of these materials resemble natural gum tissues making the prostheses less conspicuous in the mouth. Materials such as vulcanite, nitrocellulose, phenol formaldehyde, vinyl plastics, and porcelain were used for denture bases. The acrylic resins were so well received by the dental profession that by 1946, 98% of all denture bases were constructed from methyl methacrylate polymers or copolymers. Other polymers developed since that time include vinyl acrylic, polystyrene, epoxy, nylon, vinyl styrene, polycarbonate, polysulfoneunsaturated polyester, polyurethane, polyvinylacetate-ethylene, hydrophilic polyacrylate, silicones, light-activated urethane dimethacrylate, rubber reinforced acrylics, and butadiene-reinforced acrylic. Acrylic polymers have a wide variety of applications in prosthetic dentistry as artificial teeth, denture repair materials, facings in crown and bridge restorations, impression trays, record bases, temporary crowns, and obturators for cleft. But most of them had a number of disadvantages like increased water sorption, decreased strength & poor color stability. But even till date it’s the most commonly, frequently used in dentistry. There are other types of polymers & copolymers like acrylic-vinyl copolymers, epoxies, polycarbonates. Also flexible like vinyl copolymers, acrylic copolymers &hydrophyllic polymers are used as denture base materials. Currently available denture base resins have drawbacks like high water sorption & solubility, cytotoxic effects of residual monomer on tissues but improved flexural strength, hardness, impact strength since they are reinforced. Accordingly, an attempt was made to assess the mechanical properties & biocompatibility of 4 different denture base resins with their cross-linking agent added to the monomer, tetra-ethylene glycol dimethacrylate (TEGDMA) as in common compared with commercially available denture base resin, DPI pink. AIM OF THE STUDY: To compare mechanical, physical property, compatibility between four heat cure denture base resins. MATERIALS AND METHODS: The materials used in this study were SR Triplex-HOT (fiber reinforced heat cure resin), Sunflex (flexible heat cure resin), Trevalon-HI (high impact heat cure resin), DPI (conventional heat cure resin). The samples were tested for flexural strength, hardness, impact strength, water sorption and solubility, cytotoxicity in accordance with ISO specification 1567 for denture base resins. RESULTS: The mean flexural strength varied from 93.82MPa for DPI to 140.95MPa for Sunflex. The mean hardness varied from 76.33kg/mm2 for DPI to 85.33kg/mm2 for SR-Triplex HOT. The mean impact strength varied from 7.99 kJ/m2 for SR to 31.71 kJ/m2 for SU. The mean water sorption varied from 0.000401gm/mm3 for SU to 0.000624gm/mm3 for TR. The mean water solubility varied from 0.14gm/mm3 for TR to 0.35gm/mm3 for SR. Statistical analysis by One-way ANOVA showed that these were statistically significant between the denture base resins for each property tested with a two-tailed probability of value. CONCLUSIONS: The Sunflex denture base resin showed superior physical and mechanical properties, biocompatible to the oral tissues, can be selected as a suitable denture base material in daily clinical practice, thus fulfilling patient’s requests.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Comparison ; Mechanical Properties ; Physical Properties ; Biocompatibility ; Four Different Denture Base Resins ; In Vitro study. |
| Subjects: | DENTAL > Prosthodontics and Crown and Bridge |
| Depositing User: | Kambaraman B |
| Date Deposited: | 12 May 2018 15:12 |
| Last Modified: | 12 May 2018 15:12 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/7736 |
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