In vitro evaluation of fracture resistance of teeth with incomplete root development and intracanal reinforcement with different materials

The aim of this study was to evaluate the fracture resistance of teeth with incomplete root development and intracanal reinforcement with adhesives materials. 50 human central and lateral incisors were instrumented and prepared to simulate an immature tooth and filled apically with MTA. The samples were divided into four experimental groups and one control group. Group 1: resin composite Filtek (TM) P90; Group 2: glass Ionomer Vitremer (TM); Group 3: resin composite Filtek (TM) Z350 XT; Group 4: glass Ionomer Ketac (TM) N 100; Group 5: negative control (instrumented but not reinforced). After, the fracture test was performed using a fracture universal testing machine (Instron (TM)). The maximum values of resistance before catastrophic fracture were collected and analyzed by Anova (p = 0.05). The results show a significant difference between the groups compared (p = 0.02). A significant difference was found between group 1 (847.73 N) and group 5 (474.77 N) (p = 0.02) applying the Bonferroni test. Despite the limitations of the study, the conclusion is that micro-hybrid composite resins are ideal materials to strengthen teeth with incomplete root development endodontically treated.