I will do Fixed Partial Denture procedure in Pangasinan tomorrow. Let’s see how it goes when I see the patient tomorrow morning.

Tooth preparation depends on the Fixed Partial Denture restoration needed. Here are the different types of abutment reduction:

Complete Cast Crown Preparation

Complete Cast Crown is an all metal restoration often used on single posterior teeth as a retainer for a Fixed Partial Denture. It provides greater retention and resistance than any other type of restoration.

Steps

Depth grooves for occlusal reduction minimum clearance on noncentric cusps 1 mm centric cusps 1.5mm
Functional cusp bevel
Occlusal reduction
Alignment grooves for axial reduction
Axial reduction
finising of chamfer
Additional retentive features if needed.
Finishing

Metal Ceramic Crown Preparation

Metal Ceramic Crown is one of the most widely used fixed restorations.

Steps

Incisal (Occlusal) reduction guide grooves 1.5 – 2mm clearance
Incisal (Occlusal) reduction
Labial reduction guide grooves (two-plane) 1.2 – 1.5 mm reduction for metal and ceramic
Labial reduction (two-plane)
Axial reduction 1 mm or 1.5mm if occlusal is porcelain
Lingual reduction
Finishing of shoulder (or beveled shoulder) shoulder must extend 1 mm lingual to proximal contact area
Finishing

All Ceramic Crown Preparation

All Ceramic Crown most esthetically pleasing prosthodontic restoration. Advantages include excellent translucency and good tissue response.

Steps

Depth grooves for incisal reduction – approximately 1.3 mm deep
Incisal reduction – clearance of 1.5 mm
Depth grooves for facial reduction – 0.8 mm
Facial reduction – 1 mm
Depth grooves and lingual reduction – initial depth 0.8 mm
Depth grooves for cingulum reduction – 1 mm reduction, shoulder follows free gingival margin
Lingual shoulder preparation – 1 mm
Finishing

Porcelain Laminate Veneers Preparation

Porcelain Laminate Veneers is a conservative method of restoring the appearance of discolored, pitted or fractured anterior teeth.

Steps

Depth cuts
Facial reduction
Proximal reduction
Incisal and lingual reduction
Margins
Finishing

Partial Veneer Crown Preparation (Posterior)

Partial Veneer Crown Preparation (Posterior) has 3 Types
1. three-quarter
2. modified three quarter
3. seven eights

Steps

Depth grooves for occlusal reduction
Occlusal reduction – clearance of 1 mm on noncentric cusp, 1.5 mm on centric
Depth grooves for axial reduction – chamfer depth of 0.5 mm
Axial reduction
Chamfer finishing
Proximal groove
Buccal and occlusal bevel
Finishing

Partial Veneer Crown Preparation (Anterior)

Partial Veneer Crown has 2 types
1. 3 quarter crowns
2. pinledges

Steps

Depth grooves for ligual reduction – 1 mm clearance
Lingual reduction – 1 mm clearance
Incisal bevel – > = .7 mm
Depth grooves for axial reduction 0.5 mm
Axial reduction – extends to interproximal about 0.4 mm lingual of contact area
Retention form
Finishing and flare

Source: Tooth Preparation / Abutment Reduction for Fixed Partial Denture