Questions and Answers
What is a Class 3 lesion?
Carious lesion on the inter proximal surface of anterior teeth not involving the incisal edge.
What are the contraindications for Class III composites?
An operating area that cannot be adequately isolated.
What clinical procedures are needed for a Class III restoration?
- Anesthesia is usually necessary for patient comfort. 2. Occlusal assessments should be made to determine the tooth preparation design. 3. The composite shade must be selected before isolation. 4. The area must be isolated for effective bonding. 5. If restoration involves the proximal contact, inserting a wedge may assist in re-establishment.
What is the purpose of tooth preparation for a Class III restoration?
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How do you access a Class III lesion from the facial approach?
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How do you access a Class III lesion from the lingual approach?
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Which side should you access the Class III lesion if it is not seen from either side?
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Name the walls of the Class III preparation:
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What should be the dimensions of the Class III preparation?
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How should the anteriors be isolated with a rubber dam?
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Describe the internal form of the Class III preparation.
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What do you need to do to finish the Class III preparation?
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Why do we bevel the margins in preparation?
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What kind of matrix band do we use on a Class III preparation?
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What are the steps in restoring the Class III preparation?
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Study Notes
Class III Lesions
- Carious lesion located on the inter proximal surface of anterior teeth, excluding the incisal edge.
Contraindications for Class III Composites
- Inadequate isolation of the operating area prevents effective bonding.
Clinical Procedures for Class III Restorations
- Anesthesia may be required for patient comfort.
- Conduct occlusal assessments to inform tooth preparation design and restoration function.
- Select composite shade before tooth dehydration occurs.
- Ensure proper isolation for effective bonding.
- Use wedges to help re-establish proximal contact if the restoration involves the proximal area.
Purpose of Tooth Preparation for Class III
- Access the defect directly.
- Remove defective structures, including caries and prior restorations.
- Design convenience form for optimal restoration placement.
Accessing Class III Lesion from Facial Approach
- Accessing from facial conserves tooth structure significantly in cases of facially positioned caries or irregular alignment.
Accessing Class III Lesion from Lingual Approach
- Preferred for better esthetics as it conserves facial enamel.
- Color matching of the composite is less critical.
- Discoloration is less noticeable, enhancing the restoration’s aesthetic longevity.
Accessing Non-visible Class III Lesions
- If the lesion is invisible from either side, a lingual access is preferred for aesthetic reasons.
Dimensions of Class III Preparation
- Axial wall depth: 1-1.25 mm.
- Incisogingival length: 1.75-2.0 mm.
- Incisal extension: at the middle of contact area.
- Gingival extension: should break contact with adjacent tooth (1.75-2.0 mm).
- Facial extension: approximately 1.5 mm to clear facial contact area.
- Incorporate a 45-degree bevel at the cavosurface margin.
- Maintain a rectangular outline shape with rounded internal line angles.
Rubber Dam Isolation for Anteriors
- For canine to canine: use floss for isolation.
- For premolar to premolar: apply retainers on both teeth.
- Utilize retainers 212 and 9 for anteriors; retainers W2 and 212 for premolars.
Internal Form of Class III Preparation
- Incisal and gingival walls should be parallel or slightly divergent, at 90 degrees to proximal and lingual surfaces.
- Facial wall remains parallel to the lingual surface and at 90 degrees to proximal.
- Axial wall parallels proximal surface, also at 90 degrees to lingual.
- Primary retention achieved through bonding techniques.
Finishing Class III Preparation
- Smooth and regular margins established, with 45-degree bevels where accessible.
- Walls should be flat, smooth, and with well-defined line angles.
- Ensure no damage to adjacent teeth.
Purpose of Beveling in Restorations
- Increases surface area for improved bonding.
- Facilitates a smooth transition between restoration and tooth structure for enhanced aesthetics.
Matrix Band for Class III Preparation
- Utilize a Mylar strip for better visibility and flexibility than metallic bands.
- Allows for light curing through the matrix.
- Position wedge below the cervical margin to prevent overhang and stabilize the mylar strip.
Steps in Restoring Class III Prep
- Select composite shade before tooth dehydration.
- Isolate the area to ensure effective bonding, employing Mylar strip for light curing.
- Rinse, dry, and etch the preparation for 15-30 seconds, extending 1 mm beyond margins before rinsing again and drying lightly.
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Description
Test your knowledge on Class III Composite Restorations in clinical dentistry. This quiz covers important definitions and procedures related to class 3 lesions. Perfect for dental students and professionals looking to reinforce their understanding of restorative techniques.