Operative- Test 2- Cavity Preparations For Amalgam Restorations

Front 1

Definition of Class I Carious Lesions

Back 1

1) Occlusal pit and fissure lesions on posterior teeth

2)Caries in the occlusal and middle third of posterior teeth

3)Caries in the lingual pits of maxillary anterior teeth

3) Groove extension preparations

Front 2

Features: Walls of the Preparation

Back 2

1) The walls are named after the surfaces they approximate

2) Wall names: mesial, distal, pulpal, buccal and lingual

Front 3

Features of the Preparation

Back 3

1) There are two additional walls: axial and gingival

2)The axial wall is parallel to the long axis of the tooth

3)The gingival wall is closest to the gingiva

Front 4

Features: Angles of the Preparation

Back 4

1) Line angle : the intersection of two walls that form a line

2)Point angle: the intersection of three walls that form a point

Front 5

Outline Form

Back 5

The placement of the cavity margins in the final positions they will occupy on the tooth

Front 6

Ideal Outline Form

Back 6

1) Preparation is centered over the grooves

2)Goes around the cusp (triangular) ridges

3)Cavosurface margins on sound tooth structure

4) Isthmus width is as narrow as possible

Front 7

Occlusal Outline Form

Back 7

1) Maintain mesial and distal marginal ridge integrity

2) Smooth flowing preparation

Front 8

Bur Orientation

Back 8

The bur should always be held perpendicular to the occlusal plane

Front 9

Bur Orientation: Maxillary Teeth

Back 9

the bur is oriented along the long axis of the tooth

Front 10

Bur Orientation: Mandibular Teeth

Back 10

bur will have a slight lingual tilt because of the orientation of the occlusal table to the root of the tooth

Front 11

Resistance Form

Back 11

The ability of the restorative material and the tooth not to fracture once placed into function

Front 12

Retention Form

Back 12

1) The shape of the prepared cavity that resists displacement or removal of the restoration from lifting or tipping forces

2) Facial and lingual walls are parallel or slightly convergent

3) Mesial and distal walls are divergent at the cavosurface margin to ensure there is dentin support

Front 13

Convenience Form

Back 13

The ability of the operator to visualize all remaining caries and to also be able to use the appropriate instruments in the preparation

Front 14

Removal of Remaining Carious Dentin and Undermined Enamel

Back 14

The elimination of any infected carious tooth or faulty restorative material in the tooth after the initial cavity preparation

Front 15

Two ways the pulpal wall is modified only in the area of the caries

Back 15

1) With a large round bur in the conventional speed handpiece

2) With a hand instrument such as a spoon excavator

Front 16

Finish of the Enamel Walls

Back 16

The further development of a specific cavosurface margin and degree of smoothness that produces the maximum effectiveness of the restorative material being utilized

Front 17

Toilet of the Cavity

Back 17

Ensuring that the preparation is free of debris before a base, liner, varnish and/or an adhesive or restorative material is placed