What is the ideal depth for cingulum rests?

Cingulum rests are crucial in the design of removable prostheses, particularly in maximizing retention and stability. The ideal depth for cingulum rests is typically around 2 mm. This depth allows for sufficient material removal without compromising the strength of the tooth structure while providing the necessary support for the framework of the prosthesis.

At this depth, the cingulum rest provides an effective guiding surface that can enhance the fit of the prosthesis and can contribute to the overall comfort for the patient. Deeper or shallower rests may not achieve the optimal balance between support and preservation of tooth structure. For example, a rest that is too shallow may not provide adequate retention, while one that is too deep can risk weakening the tooth and may lead to potential complications.

Understanding the specific indications for cingulum rests and the need for their careful placement is critical for successful prosthetic outcomes.