Effect of different temporary restorationsons on fracture resistance of endodontically treated premolar teeth

Abstract

Objective: To investigate the fracture strength of endodontically treated teeth temporarily restored with some commonly used interim restorations. Materials & Methods: Ninety extracted maxillary premolars were used in this study. Fifteen teeth were left intact as positive control. Endodontic treatment was performed on the remaining 75 teeth. The endodontically treated teeth were then randomly assigned into 5 groups (n=15). The teeth were not restored in the first group and served as negative control. In the remaining four experimental groups, the teeth were restored with Zonalin, IRM, Coltosol, or Fuji II LC resin modified glass ionomer (RMGI) temporary cements. Following incubation, the fracture strength of teeth was measured with a universal testing machine. One way analysis of variance (ANOVA) followed by Tukey post hoc test was used to analyze the data. Results: The fracture strength of teeth restored with Fuji II LC was significantly greater than other groups (p<0.001) including intact teeth (p=0.025); however, the fracture strength of teeth restored with other temporary materials was significantly lower than intact teeth (p<0.05) but with no significant difference from negative control. Conclusions: From structural resistance standpoint, RMGI is the best choice for short-term temporary restoration of endodontically treated teeth. Other temporary restorative materials have no reinforcing effect on tooth structure