Fixed Prosthodontics I Quiz

What is the recommended finish line for the lingual surface during tooth preparation?

• Chamfer finish line (0.5-0.8 mm)

• Knife-edge finish line (2-2.5 mm)

• Shoulder finish line (1-1.5 mm)

• Beveled finish line (1.5-2 mm)

Why is a shoulder finish line recommended for the buccal surface?

• To enhance bonding with veneered material

• To conserve tooth structure

• To ensure esthetics

• To provide clearance for metal contacts

How much lingual reduction is needed in anterior teeth for clearance if the contact is on porcelain?

• 1 mm

• 1.5 mm

• 2 mm

• 2.5 mm

What is the direction of cutting for incisal reduction during tooth preparation?

• Bucco-occlusal

• Linguo-incisal

• Disto-lingual

• Mesio-distal

Why should the labial surface be prepared in two distinct planes?

• To conserve tooth structure

• To ensure proper bonding with veneered material

• To provide clearance for metal contacts

• To prevent over-contoured restoration

Where should the labial reduction end around the labio-proximal line angle?

• 1 mm labial to the proximal contact

• At the proximal contact

• 1 mm lingual to the proximal contact

• At the labio-proximal line angle

What is the purpose of the wing or 1/2 groove in tooth preparation?

• To improve occlusal clearance

• To increase the thickness of the crown

• To provide resistance to rotation & torque

• To enhance esthetics

Why is a shoulder with bevel finish line better in marginal adaptation?

• To provide resistance to rotation & torque

• To increase metal collar adaptation

• To improve bonding with veneered material

• To enhance esthetics

What is the purpose of the wing extension in tooth preparation?

• To improve occlusal clearance

• To provide resistance to rotation & torque

• To enhance esthetics

• To increase the thickness of the crown

Which method is used for bonding acrylic resin to metal substructure?

• Chemical - Formation of oxide layer

• Mechanical - Beads

• Chemical - Gold alloys

• Mechanical - Undercut