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The decreased strength seen in endodontically treated teeth is primarily because of the loss of coronal tooth structure; it is not a direct result of the endodontic treatment. Endodontic access in the pulp chamber destroys the structural integrity provided by the coronal dentin of the pulpal roof & allows greater flexing of the tooth under function. In cases with significantly reduced remaining tooth structure, normal functional forces may fracture undermined cusps or fracture the tooth in the area of the smallest circumference, frequently at the cemento-enamel junction. The decreased volume...