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The fracture resistance of restored mandibular molars using different cavity designs: An in vitro comparative
Aditya Mitra1, Snigdha Sharma1, Anirban Bhattacharyya1
1Department of Conservative Dentistry and Endodontics, Haldia Institute of Dental Sciences and Research, Haldia, West Bengal, India.
Background:
The stress distribution of a restored tooth is different from that of an intact sound tooth. The fracture resistance of a restored tooth depends on cavity design, remaining tooth structure, and material used.
Aim:
This in vitro study evaluated and compared the fracture resistance of mandibular molars restored using composite resin.
Materials And Methods:
Forty freshly extracted, intact mandibular molars were used, with their roots embedded in acrylic resin for stability. Cavities were prepared using a No. 2 round bur and straight fissure diamond, then divided into four groups with specific variations in cavity dimensions. Samples were tested using a universal testing machine, applying vertical load along the long axis at the central fossa to record fracture load.
Statistical Analysis:
One-way analysis of variance and Tukey's post hoc analysis were used for statistical analysis.
Results:
Fracture resistance of the groups, listed in descending order, was: Lingual wall 1.5 mm (2417 ± 160 N) > Buccal wall 1.5 mm (2122 ± 75.9 N) > Lingual wall 1 mm (1966 ± 75.7 N) > Buccal wall 1 mm (1335 ± 216 N).
Conclusion:
The lingual wall 1.5 mm exhibited the highest fracture resistance, while the buccal wall with 1 mm thickness showed the least resistance.
