روش پيشنهادي تخمين منحني مشخصه ي آب - خاك براي خاك هاي چسبنده

Evaluation the effects of tooth surface conditioning on fracture resistance of compomer restorations

Background and Aim: Compomers are placed between composite resins and glass ionomers cements regarding their surface and mechanical properties. Compoglass is a trademark of compomers that is bonded to tooth surface using Syntac single component. The aim of this study was to investigate the effects of tooth surface conditioning on fracture resistance of compoglass restorations prior to Syntac agent application. Materials and Methods: In an experimental study, thirty intact maxillary premolar teeth were chosen and divided into three groups of ten each. MOD cavities were prepared and restored with compoglass as follows: Group 1: Restoring the teeth without conditioning the cavity surfaces prior to Syntac application. Group 2: Conditioning the cavity surfaces with phosphoric acid prior to Syntac application. Group 3: Conditioning the cavity surfaces with polyacrylic acid prior to Syntac application. All the samples were tested under compressive loading and the findings were statistically analyzed using ANOVA test. Results: The mean values obtained from groups 1, 2 and 3 were 1585.70, 1465.20 and 1535.60, respectively. No statistically significant differences was found in fracture resistance between tested groups. Conclusion: Conditioning tooth surfaces with phosphoric acid and polyacrylic acid prior to Syntac application had no effect on increasing the fracture resistance of compoglass restored teeth.