Partial coverage restoration

Question 1

Indications of onlay

Answer 1

Large restoration
Endodontic ally treated tooth
Teeth at risk to fracture
Removeble Prosthodontic abutment

Question 2

Contraindications of onlay

Answer 2

High caries rate
Young patient
Esthetics
Small restoration

Question 3

Advantages and disadvantages of onlay

Answer 3

Strength
Biocompatibility
Lower wear
Control of contours
,
Number of appointment
Higher chair time
Temporary restoration
Coast
Technique sensitive

Question 4

Preparation , internal form

Answer 4

1.5 mm of pulpal depth
Rounded internal line angles
10 to 12 degrees of axial wall convergence
Greater than or equal to 10 degrees of divergence on buccaneers and lingual walls
1to 1.5 mm of axial wall reduction

Question 5

Preparation , external form

Answer 5

90 degrees convergence margins
2 mm of isthmus width
2mm of occlusal reduction for cuspal coverage smooth flowing margins

Question 6

For onlay restoration, nonworking and working cusps are with at……… of material respectively

Answer 6

least 1.5 and 2 mm