Because different biomaterials require variations in thickness for strength, the preparation dimensions for full-coverage restorations can vary.

The geometric form of the preparation varies according to the anatomical morphology of the tooth. The anterior teeth have an oval form. Low tapering of the walls provides such geometry in a simple way. This geometric shape provides inherent resistance to forces of mastication. Therefore, when sufficient tooth structure is missing, like in cases of massive destruction or a badly decayed tooth, the biomechanics of the preparation can be optimized by restoring these contours with a core build-up prior to completion of the preparation.

In order to achieve success, it is essential that the preparation presents some features and meets certain requirements. The general shape of the preparation should follow the anatomical contours of the natural tooth with smooth and rounded transitional line angles.

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