Fracture Resistance of Molars with Simulated Strip Perforation Repaired with Calcium Silicate Based & Bioceramic Root Repair Materials – An In-Vitro Study.

Abstract

Aim: This in-vitro study assessed the effect of simulated strip perforations on the fracture resistance of mandibular molars and compared three repair materials: Biodentine, Mineral Trioxide Aggregate (MTA), and Bio-C Root Repair.

Materials and Methods: Fifty extracted mandibular molars were divided into five groups (n=10). Group I: intact teeth (negative control); Group II: untreated strip perforations (positive control); Groups III–V: perforations repaired with Biodentine, MTA, and Bio-C respectively. Standardized perforations were created in the mesial root, repaired using a sandwich technique, and restored with composite. Samples were subjected to compressive loading in a universal testing machine. Data were analyzed using ANOVA and post-hoc tests.

Results: Strip perforation significantly reduced fracture resistance (p<0.001). Intact teeth showed the highest mean resistance (694.4 ± 60.49 N), while untreated perforations exhibited the lowest (273.9 ± 96.18 N). Bio-C demonstrated the highest reinforcement (685.2 ± 89.18 N), comparable to intact teeth and significantly superior to Biodentine (450.5 ± 143.15 N) and MTA (452.3 ± 126.62 N), which showed similar outcomes.

Conclusion: Strip perforations greatly compromise tooth strength. Bio-C Root Repair material restored fracture resistance closest to intact teeth, making it a promising option for clinical management. Biodentine and MTA offered moderate but comparable reinforcement.