TOPIC: CLINICAL CROWN PREPARATION IN FPD

🎯 KEY POINTS:

🔺Functional cusp bevel is given on the lingual inclines of the maxillary lingual cusps and buccal inclines of the mandibular buccal cusps.

🔺Finish line of choice in cast metal is chamfer, in all-ceramic is shoulder, in PFM is shoulder with bevel on labial surface and chamfer on lingual and proximal surfaces, shoulder with bevel is proximal box of inlay and onlay.

🔺Knife-edged finish line is advocated in lingually tilted mandibular posterior teeth.

🔺Truss effect is provided to enhance the structural durability.

🔺Half-moon fracture is produced in the labiogingival area of all-ceramic crown due to overshortening of the preparation.