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:
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Class III prep involves __________ prewedging in the gingival embrasure.
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What specific bur is used for entry cut on the DL marginal ridge in class III preparations?
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Class III outline form is determined by ___________ AND extent of ________ AND _______ of the composite restorative material.
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Weak enamel at the _________ needs to be removed from the outline form.
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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.
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Access is preferred from the lingual for aesthetic purposes, but a facial approach may be used if which of the following conditions are met?
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Class III outline form may include only the _________ surface.
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In a class III tooth prep: penetration of bur should be at a limited axial depth of _______ mm inside the DEJ.
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In a class III tooth prep: internal and external line angles are ___________, proximal and gingival contact may be ________ if necessary.
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In a class III tooth prep: for small lesions, the facial margin is extended -_ mm into the facial embrasure.
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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.
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Cavosurface margin angle should be 90 at ______ margins; although the lingual wall does NOT have to be @ 90 degrees.
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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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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!