Effect of Different Designs of Endodontic Access Cavities and Instrument Taper on the Fracture Resistance – An In vitro Study

Ultraconservative cavities showed preservation of biomechanical integrity of the tooth and conservation of fracture strength in comparison with traditional cavities before instrumentation. Instrumentation of ultraconservative and traditional cavities further decreases the fracture resistance of the tooth. However, the type of taper seemed to have minimal effect on the structural and biomechanical integrity of the tooth.