3. Form the cavity so that under forces of mastication the tooth or the restoration or both will not fracture and the restoration will not be displaced. 4. Esthetic and functional placement of a restorative material. FACTORS AFFECTING CAVITY PREPARATIONS
GENERAL FACTORS
PATIENTS FACTORS
1. Diagnosis : 1. Prior to any restorative procedure a complete and through diagnosis must be made assessment of both pulpal and periodontal status will influence the potential treatment of tooth especially in terms of the choice of restorative materials as well as the design of cavity preparation. 2. Assessment of occlusal relationships must be made. 3. Patient concern for esthetics should be considered 4. Other planned treatment should be considered for e.g. such as when tooth is used as an abutment for FPD or RPD, design of restoration is altered to accommodate maximum effectiveness of that prosthesis. 5. Risk assessment find out with dietary habits.
DMFT index and
microbiological examination. 2. Knowledge of Dental Anatomy : Direction of enamel rods, thickness of enamel and dentin, position of pulp relationship of tooth to the investing tissue. PATIENTS FACTORS : 1) Patients knowledge and appreciation of good Dental Health Influences the choice of restorative material. 2) Patients economic status
5