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Conservative Dentistry - 3 Questions
For porcelain inlays, a butt joint or butt-type cavosurface margin is recommended. This design provides maximum bulk of the porcelain at the margin, which is crucial because porcelain is brittle and needs sufficient material thickness to withstand occlusal forces and prevent fracture.
Explanation: In a conventional Class III amalgam cavity preparation, the axial wall should be straight and parallel to the long axis of the tooth. This design ensures that the restoration has adequate resistance form and is less likely to dislodge under occlusal forces. The wall being deeper incisally than gingivally helps to maintain the integrity of the tooth structure and provides a stable base for the amalgam restoration.
The direction of the force is the most critical factor for the adaptation of gold foil to cavity walls because the force must be directed at a \(45^{\circ }\) angle to the cavity wall to ensure proper condensation and a tight seal.
MCQ