CROWN PREPARATION: General principles

Dental Preparations must be carried out according to previously established scientific principles, which are: mechanical, biological and aesthetic. 

This constitutes one of the most important stages in the construction of a dental prosthesis, either as an individual crown or a fixed dental prosthesis retainer.

Failures in the dental preparation lead to the failure of the restoration either by insufficient reduction of the dental structure that could cause over-contour, having a high aesthetic compromise and gingival inflammation affecting the periodontal health of the patient, color alteration (opacity or translucent), and insufficient thickness of the restorative material. 

If excessive tooth wear occurs, irreversible pulp damage, weakening of tooth structure and decreased retention and resistance affecting biomechanical behavior can occur. 

If the preparation of the cervical termination is located deep, invading the periodontal biological space, one of the following four pathological alterations would occur: infra-osseous pocket formation, gingival recession, localized bone loss, localized gingival hyperplasia or a combination of the alterations described above.