Influence of onlay cavity preparation on the compression resistance of primary teeth restored with composite resin

Abstract

The aim of this study was to compare the compression re- sistance of the Z100 and Prisma TPH indirect composite resin res- torations in primary teeth. Thirty extracted primary teeth were used in this study. They were stored in 100% wet environment. The teeth were divided according to the tooth group in ten lower first molars, ten lower second molars and ten upper second molars. The teeth were prepared using a special bur. After that, impressions were taken using a condensation silicon. The models were obtained using plaster where the restorations were made. A half-number of the teeth from each tooth group was indirectly restored using Z100 and Prisma TPH resin composites. The restorations were bonded us- ing ScotchbondTM Multipurpose Plus Dental Adhesive (3M Dental Products). The teeth were sub- mitted to fracture resistance at a Losenhausenwerk machine at 0 to 200kgf range and 3mm/min speed load. The Z100 composite resin showed higher compression resistance values in comparison to Prisma TPH values (p<0.05). However, there was no significant statistical difference among the tooth groups (p>0.05). Key words: composite resins, compression resistance, primary teeth, onlay.