Abstract Background: The current study was planned to determine suitable material for restoration in class II box-only cavity. Aim: The aim of the study were to assess the fracture resistance of maxillary premolars with silver amalgam, GC Fuji Type IX glass ionomer cement (GIC), and Filtek TM P60 composite restorations in class II box-only cavities. Materials and Methods: Class II box-only cavities were restored in 90 teeth and tooth samples were divided into three groups ( n = 30 each): Group I – silver amalgam, Group II – Filtek TM P60 composite, and Group III –GC Fuji Type IX GIC. A universal testing equipment was used to load the specimens. The fracture resistance (MPa) and the fracture force (N) were noted. MINITAB software was used to analyze the data. Statistical Analysis: The fracture resistance of restorative materials was compared by one way analysis of variance (ANOVA). The significance of mean difference between groups was done by Tukey post hoc analysis at a level of family-wise error rate 5%. Results: The mean fracture resistance was highest in Silver amalgam group (9.165±1.255 MPa) followed by composite (9.133±1.066 MPa) and GIC group (4.136±0.599 MPa). One-way analysis of variance (ANOVA) test revealed a statistically significant difference between all the groups ( P = 0.005). The fracture resistance of groups I and II was substantially higher ( P = 0.00001) than that of group III, according to the post hoc Tukey test. However, there were no significant differences among the other groups ( P = 0.992). Conclusion: Considering the materials chosen to restore class II box-only cavity, both silver amalgam and Filtek TM P60 composite were superior in demonstrating good fracture resistance followed by Fuji Type IX GIC.
Wani et al. (Tue,) studied this question.