Chapter 10: Clinical Technique for Amalgam (Pages 368 - 386)

Class 3 preparation

proximal surfaces of anterior teeth; do not include incisal edge

What type of restoration material is typically used for a class 3 preparation?

composite = for aesthetic reasons

When is amalgam material used for class 3 restoration?

When there is minimal facial involvement

When is a lingual dovetail used for class 3 restorations?

When bevels do not provide enough retention or additional retention is needed with a larger restoration

Where is the initial punch cut for a class 3 preparation made?

Slightly gingival to contact point because decay is below the HOC

In a class 3 preparation the burr should be --- to the lingual surface of the tooth

perpendicular

Penetration of a preparation should be limited to the initial axial depth of

0.5 mm into dentin

In a class 3 preparation the facial wall / margin should be extended ---- into the facial embrace

0.2 - 0.3 3 mm

In a class 3 preparation the cavosurface margins should be ---

90 degrees

Why should internal line angles be rounded?

Allow for more condensation of enamel

reduce risk of stress fracture

How deep should retention grooves be?

0.2 mm - 0.5mm

If a lingual dovetail is needed in a class 3 preparation, it is prepared only after ---- preparation of the proximal portion has been completed

initial

Lingual dovetail should be conservative and non extend past the ---- of the lingual surface

mesiodistal midpoint

Patients with ---- are predisposed to root caries lesions because dents is more susceptible to demineralization than enamel

gingival recession

True / False: Prophylactic, preventive treatment alone will be inadequate if the caries lesion has progressed to decalcify and soften enamel to an appreciable depth

True

True / False: Generally Class V amalgams placed on the facial surface of mandibular canines, premolars, and molars are not readily visible.

True

In a class 5 restoration, the gingiva can be retracted using a ----

retraction cord

The retraction cord should be placed in the sulcus before ---- to reduce the possibility of cutting instruments damaging the free gingiva

initial tooth preparation

The retraction cord may be moistened with ---- before, during, ir after placement if bleeding is to be observed / excepted

hemostatic solution

What is the axial depth when inside the cementum?

0.75 - 1 mm

What does significant blanching of the free gingiva with a retraction cord mean?

Too much pressure is applied

True / False: A braided or woven retraction cor dis usually easier to use because it does not unravel during placement

true

A full-coverage indirect restoration should be considered for teeth with extensive --- decalcification (but only after caries risk has been reduced).

cervical

In a class 5 preparation, where is the enamel thicker: incisal or gingival wall?

Incisal (occlusal)

If a class 5 preparation is on a root surface, the initial axial depth is approximately --- mm

0.75 - 1mm

If external walls are perpendicular to the external tooth surface, that means they are --- to the enamel rods

parallel

If external walls are ---- to the external tooth surface, that means they are parallel to the enamel rods

perpendicular

What is the ideal depth of a retention groove?

0.25 - 0.5mm

How is a restoration approached when the caries lesion of a class 5 extends past the transitional line angle?

Prepare facial portion first

Then extend mesial or distal past transitional line able

Is the 75-85 gingival marginal trimmer mesial or distal?

Mesial

Is the 90-100 gingival marginal trimmer mesial or distal?

distal

True / False: If the Class V outline form approaches an existing proximal restoration, it is better to extend slightly into the bulk of the proximal restoration rather than to leave a thin section of the tooth structure between the two restorations

true

When proper treatment requires Class II and V amalgam restorations on the same tooth, which preparation and restoration is completed first?

Class 2

Where is amalgam condensed into first?

Retention grooves

What walls is amalgam condensed into after condensation into retention grooves?

Mesial and distal walls

What is done once amagalm is condensed into the retention grooves and mesial and distal walls?

Bulk placed in the center of the restoration to fill / carve

True / False: amalgam material should remain at the margins

False - should not remain at the margins. Risk of fracture

What happens when softer dentin is exposed / dentin is exposed due to loss of enamel such as in abrasion/bruxism?

Dentin wears down faster than surrounding enamel

When exposed dentin wears out faster than surrounding enamel what kind of areas form?

Cupped areas

What is a measure of clinical success of amalgam restorations?

Length of time without failing

When is a matrix usually used?

When 3 surfaces of the tooth have been prepared

What does it mean when a matrix is burnished?

Intentional deformation to produce rounded edges so that the matrix can fit the curvature of the tooth