In vitro study to Compare fracture resistance of immature teeth restored apically with mineral trioxide aggregate, Biodentine.

Abstract

Background:
The management of immature teeth with thin dentinal walls and large apical foramina presents a significant challenge due to their susceptibility to fracture. Mineral Trioxide Aggregate (MTA) and Biodentine are commonly used materials in apexification procedures to enhance the apical seal and fracture resistance of these teeth. This in vitro study compares the fracture resistance of immature teeth restored apically with MTA and Biodentine.

Materials and Methods:
Forty extracted immature mandibular premolars were divided into two experimental groups (n=20) based on the material used for apical restoration: Group 1 – Mineral Trioxide Aggregate (MTA), and Group 2 – Biodentine. The apical 5 mm of the root canals was filled with either MTA or Biodentine, while the coronal portion was obturated using gutta-percha and resin-based sealer. All specimens were subjected to thermocycling (5°C–55°C, 500 cycles) to simulate oral conditions. Fracture resistance was assessed using a universal testing machine, applying a compressive load at a crosshead speed of 1 mm/min until fracture occurred.

Results:
The mean fracture resistance in Group 1 (MTA) was 350 ± 25 N, while in Group 2 (Biodentine), it was 410 ± 30 N. Statistical analysis using a t-test revealed that Biodentine exhibited significantly higher fracture resistance compared to MTA (p < 0.05).

Conclusion:
Biodentine demonstrated superior fracture resistance compared to Mineral Trioxide Aggregate in the restoration of immature teeth. This suggests that Biodentine may be a better choice for enhancing the structural integrity of teeth undergoing apexification.