Fracture Resistance Of Teeth With Simulated Cervical Root Resorptions Restored By Various Materials

This study aimed to compare the fracture resistance of teeth with cervical root resorptions following restoration with resin composite, resin-modified glass ionomer (RMGI), Biodentine, and mineral trioxide aggregate (MTA).Methods: 60 sound extracted single-rooted maxillary premolars were divided into 4 experimental (n=10) and 2 control (n=10) groups. Ten intact teeth served as the negative control group. In the remaining teeth, cavities were prepared with 2 mm depth, extending 1 mm above the cementoenamel junction (CEJ), and 2 mm below it. The cavities remained unrestored in the 10 positive control teeth. The cervical cavities in the remaining teeth were restored with Z250 resin composite, Fuji II LC RMGI, ProRoot MTA, and Biodentine. The teeth' fracture resistance was measured using a universal testing machine and recorded in newton (N). Data were analyzed using one-way ANOVA followed by Tukey's test with a 95% confidence interval.Results and conclusions: Significant differences were noted in the fracture resistance of composite resin and RMGI with the positive control group (P<0.05). No significant difference was noted between the Biodentine and MTA groups with the positive control group in this respect (P>0.05). Within this study's limitations, it seems that the resin composite and RMGI restorations can increase the fracture resistance of teeth with artificially-induced cervical resorption defects. However, Biodentine and MTA as bioactive cement have no strengthening effect on the tooth structure.