Abstract
The effects of torque, torsion, and bending on teeth and the supporting structures were analyzed. The physical properties of dental materials and structures determine the success or failure of dental restorations. All dental structures and materials must be used within their proportional limits of elasticity. Unless the principles of mechanics acceptable to engineering practice are observed in applying and resisting loads on dental fabrications, failure of the foundation is likely. The kinematics of dental restorations determines cavity preparation. Important principles of cavity preparation stem from this study. Unless advantage is taken of this knowledge, failure of the abutments is likely.
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