CLASS 2 Flashcards
Occlusal margin should be narrower on the ______ than the _______
State the Rationale and Principle
Rationale: To lock amalgam in the cavity
Principle: Retention of Amalgam / Restoration
Isthmus width should be _____ the distance from the Buccal to Lingual cusp
State the Rationale and Principle
1/4
Rationale: Less tooth reduction to preserve the strength of both amalgam and tooth structure
Principle: Resistance of tooth and amalgam / restoration
Cavity has a _________ dovetail
State the Rationale and Principle
Inverted Truncated
Rationale: To lock amalgam in the cavity
Principle: Retention of amalgam / restoration
State the Rationale and Principle of Dovetail in Class 2
Rationale: Extend of questionable grooves
Principle: Extension for prevention
Pulpal wall is made flat
State the Rationale and Principle
Rationale: To evenly distribute the forces of mastication to prevent fracture amalgam and tissue
Principle: Resistance of both amalgam and tooth
No beveling on the occlusal CSM
State the Rationale and Principle as well as the name of the margin
Butt margin
Rationale: Amalgam has weak edge structure and to prevent fracture
Principle: Resistance of Amalgam
Mesial and Distal wall is made _______
State the Rationale and Principle
Divergent
Rationale: Follow direction of enamel rods and prevent unsupported enamel
Principle: Resistance of tooth
No undercut on __________ line angle
State the Rationale and Principle
Mesiopulpal
Rationale: To conserve marginal ridge and to not make it unsupported
Principle: Resistance of Tooth
Internal line angles are rounded
State the Rationale and Principle
Rationale: Reduce concentration of stress to prevent fracture of amalgam
Principle: Resistance of amalgam / restoration
Bucco and Linguo proximal wall are slightly convergent
State the Rationale and Principle
Rationale: Increases bulk for the restoration
Principle: Retention of restoration
Axial length is 1.5 mm from the ______ to the __________
State the Rationale and Principle
Gingival wall to the Axiopulpal line angle (APLA)
Rationale: For Bulk of restoration & Gingival wall should be beyond the contact area
Principle: Bulk -> Resistance of restoration
Gingival wall -> Extension for prevention
Axial wall is placed ____to _____ mm within the DEJ
State the Rationale and Principle
0.2 to 0.5 mm
Rationale: Pulp protection and Give bulk to amalgam
Principle: Resistance of amalgam
Axial wall is _______ to the long axis of the tooth and follows the tooth contour making the axial wall _________
State the Rationale and Principle
Parallel and Slightly convex
Rationale: Better resistance to biting force
Principle: Resistance of amalgam / restoration
Reverse curve or ____ curve is placed on the proximal buccal wall at 90 degrees in relation to the occlusal CSM
State the Rationale and Principle
S curve
Rationale: Increase bulk for amalgam to prevent fracture
Principle: Resistance for amalgam or restoration
