Class III Cavity Preparation Flashcards

Questions and Answers

_ cavity preparation and restoration is a procedure that involves the proximal surface of anterior teeth.

Class III

Most of the lesion in a class III is _______ to the contact area.

cervical

Class III __________ is not frequently used due to aesthetics.

amalgam

Indications of class III amalgam:

Distal surface of max and mandibular canines, where the prep has = minimal facial involvement Gingival margin is primarily in = cementum Difficulty in = moisture control Preps that do NOT involve the facial surface or undermine the = incisal corner Signup and view all the answers

Class III prep involves __________ prewedging in the gingival embrasure.

prewedging Signup and view all the answers

What specific bur is used for entry cut on the DL marginal ridge in class III preparations?

No. 2 bur Signup and view all the answers

Class III outline form is determined by _____ AND extent of AND _ of the composite restorative material.

access Signup and view all the answers

Weak enamel at the _________ needs to be removed from the outline form.

outline Signup and view all the answers

When creating the outline form, the bur is oriented in a way that penetrates the carious and positioned so the long axis is ___ to the lingual surface of the tooth.

lesion; perpendicular Signup and view all the answers

Access is preferred from the lingual for aesthetic purposes, but a facial approach may be used if which of the following conditions are met?

All of the above Signup and view all the answers

Class III outline form may include only the _________ surface.

proximal Signup and view all the answers

In a class III tooth prep: penetration of bur should be at a limited axial depth of _______ mm inside the DEJ.

0.5mm Signup and view all the answers

In a class III tooth prep: internal and external line angles are ___, proximal and gingival contact may be if necessary.

rounded; broken Signup and view all the answers

In a class III tooth prep: for small lesions, the facial margin is extended -_ mm into the facial embrasure.

0.2-0.3 mm Signup and view all the answers

In a class III tooth prep: lingual outline blends with the incisal and gingival margins in a curve, creating a preparation with little or no wall.

smooth; lingual Signup and view all the answers

Cavosurface margin angle should be 90 at ______ margins; although the lingual wall does NOT have to be @ 90 degrees.

ALL Signup and view all the answers

Study Notes

Class III Preparation and Restoration

Class III cavities involve proximal surfaces of anterior teeth.
Most lesions in Class III are located cervical to the contact area.
Use of amalgam for Class III is uncommon due to aesthetic concerns.

Indications for Class III Amalgam

Minimal facial involvement of the distal surface of maxillary and mandibular canines indicates appropriateness for amalgam.
Gingival margin primarily resides in cementum.
Situations with difficulty in moisture control are candidates for amalgam.
Preparations that do not compromise the facial surface or the incisally undermined corner are suitable.

Prewedging in Class III Prep

Prewedging aids in better protection of soft tissue and rubber dam.
Improves access during the procedure.
Enhances reestablishment of proximal contact.

Burs for Class III Preparation

Use a No. 2 bur for entry cuts on the distolingual marginal ridge.
Employ a 330 or 245 bur for the main preparation.
Retention grooves utilize 1/2 or 1.4 mm burs.

Determining Outline Form

The outline form depends on access, the extent of caries, and the placement of composite restorative material.

Weak Enamel Removal

Enamel considered weak in the outline form should be removed to enhance strength and longevity of the restoration.

Bur Orientation in Outline Creation

Burs should penetrate the carious lesion, aligned perpendicular to the lingual surface while angling mesially to conserve the marginal ridge.

Access Approaches

Lingual access is preferred for aesthetics; however, facial access may be warranted if:
- Cavitation primarily arises from the facial area.
- An existing facial restoration is present.
- Teeth are overlapped or misaligned, which makes a facial approach more conservative.

Outline Form Limitations

The outline may only involve the proximal surface.
A dovetail may be included for previous restorations or larger restorations.

Depth of Penetration

Burs should penetrate to a limited axial depth of 0.5 mm inside the DEJ, or 0.75 mm if the gingival margin is on the root surface.

Line Angles and Contacts

Internal and external line angles are rounded; proximal and gingival contacts may be broken if necessary.

Facial Margin Extension

For small lesions, extend the facial margin into the facial embrasure by 0.2-0.3 mm with a curved outline.

Lingual Outline Characteristics

Lingual outline should smoothly blend with incisal and gingival margins, resulting in minimal to no lingual wall.

Cavosurface Margin Angles

Maintain 90-degree angles at all margins; the lingual wall does not necessitate a 90-degree angle, and may be continuous with the axial wall.

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Description

Test your knowledge with these flashcards on Class III cavity preparation and restoration. Focus on key concepts related to the proximal surfaces of anterior teeth and indications for amalgam use. Boost your understanding of this important dental procedure!