Indirect Restorative Procedures Flashcards
Recommended taper for indirect tooth preparation
6-11
Surface area for indirect preparation
Molar more retentive than premolar, tall axial wall more retentive than short
When strength of the luting agent is less than induced stress it will cause
Cohesive failure through cement layer
The feature of the preparation that resist dislodgement along any axis other than path of placement
Resistance form
What determines if cuspal coverage is required
Amount of tooth structure lost between cusp tip and central groove
If tooth structure loss is <= to 1/2 the distance between central groove and cusp tip
No cuspal coverage required
MOD inlays will increase the risk of cusp fracture due to
Wedging effect
Central groove preparation for inlays
Depth: 1.8 mm
Perpendicular to occlusal table
Proximal box preparation for MO/DO cast inlay
Width of gingival seat mesiodistally 1.0 mm
Minimum of 0.6 mm clearance
MOD cast onlay preparation dimensions
Functional cusp: 1.5mm
Non-functional cusp: 1.0 mm
Functional cusp chamfer margin: 1.0 mm
External walls of inlays divergence
10-12 degrees
Bevels in inlays and onlays
Bevel placed in cast inlay but not in ceramic inlay
In bruxism which type of inlay or onlay is contraindicated
Ceramic
Advantages of ceramic inlays over composite
-Less marginal leakage
-Superior wear resistance
-Superior esthetic durability
Disadvantages of ceramic inlays
Brittle
Causes wear of opposing tooth
Technique sensitive
