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Volume 4 Issue 4 (July - August, 2016)

Original Articles

A COMPARATIVE STUDY OF EFFECT OF ALGINATE MOULD SEAL CONTAMINATION ON BOND STRENGTH BETWEEN RESIN TEETH AND CONVENTIONAL AND HIGH IMPACT HEAT CURING ACRYLIC RESIN DENTURE BASE MATERIAL- AN IN VITRO STUDY
Surinder Kumar Sharma

Denture base material most commonly employed in construction of denture is the heat cure acrylic resin. Acrylic resin teeth are preferred over porcelain teeth because they are claimed to be chemically bonded to the acrylic resin denture base material and are easy to adjust. An in vitro study was conducted to evaluate and compare the effect of alginate mould seal contamination on bond strength between resin teeth and conventional and high impact heat curing resin dental base materials. Eighty specimens, out of which forty were constructed by using conventional heat cure acrylic resin denture base material (Ashvin) (20 in control and contaminated group each), and forty of high impact heat cure acrylic resin denture base material (20 in control and contaminated group each) were taken to measure bond strength between tooth and denture base material. Results showed that for conventional heat cure acrylic resin denture base material (Ashvin), the maximum force needed for deboning was 371.7 N in case of contaminated group (C2) and 502.4 N in case of control group (C1). These forces were equivalent to a stress of 24 MPa and 33.49 MPa respectively. The findings show that the technical laboratory factors that contribute to the bond strength of acrylic resin tooth to the denture base polymethyl methacrylate is surface contamination. The joint surface can be contaminated with denture wax or by a tin foil substitute such as sodium alginate, both of which decreases the bond strength. Hence it was concluded that the strength of the bond achieved at the tooth / denture base interface may be related to the degree of cross-linking and the extent of copolymerization of the acrylic tooth and denture base.
Key words: Denture, acrylic resin, bonding, tooth.

 
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