Class I&II Cavity Preparation for Composite Restoration

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What is the purpose of preoperative wedging in the gingival embrassure and bitine rings for Class II direct composite restorations?

To separate teeth and re-establish proximal contact with the composite restoration (correct)

To achieve proper occlusal relationship

To improve the adhesion of the composite restoration to the tooth surface

To prevent microleakage around the restoration

What type of tooth preparation design is indicated when only the proximal surface is defective, without any lesions on the occlusal surface?

Scooped-out appearance prep

Class II amalgam tooth preparation

Box-only tooth prep (correct)

Facial or lingual slot prep

What is the purpose of the proximal extensions prepared using another instrument with straight sides in a scooped-out appearance prep?

To create a bevel for better adhesion of the composite restoration

To maintain pulpal and axial depths uniformity

To prepare walls that are 90 degrees or greater (correct)

To aid in separating teeth for better access to the lesion

What type of tooth preparation design resembles a more traditional Class II amalgam tooth preparation for moderate to large Class II direct composite restorations?

Occlusal step and proximal box Signup and view all the answers

Why is it contraindicated to use occlusal cavosurface margin bevel in Class II direct composite restorations?

To avoid loss of sound tooth structure Signup and view all the answers

What is the purpose of placing conservative bevels in Class II direct composite restorations?

To achieve more effective etching pattern Signup and view all the answers

What is the advantage of using an inverse or internal bevel at the gingival margins in Class II direct composite restorations?

Reduces microleakage compared to butt joint Signup and view all the answers

Why is it important to extend the diamond over the DEJ with the tip positioned to create a gingival directed cut inside the DEJ in Class II direct composite restorations?

To include the entire caries for removal Signup and view all the answers

Why is it not required to extend the proximal box beyond contact with the adjacent tooth in Class II direct composite restorations?

To simplify matrix, composite insertion, and contouring procedures Signup and view all the answers

What does holding the diamond over the DEJ with a slightly convex arc outward aim to achieve in Class II direct composite restorations?

Exposing enamel rods transversely for better adhesion pattern Signup and view all the answers

Why is it important to maintain enamel margins at the gingival margin during Class II direct composite restorations?

For better adhesion of the composite restoration to tooth surface Signup and view all the answers

What is indicated if an external cavosurface margin forms a right angle with the tooth surface during Class II direct composite restorations?

Beveling at facial and lingual proximal margins Signup and view all the answers

What is not required for strength in composite restorations, unlike in amalgam?

Mechanical retention Signup and view all the answers

According to the clinical tip, what is unnecessary for the removal of a slightly undermined tooth?

Bonded composite reinforcement Signup and view all the answers

Which type of caries is unnecessary for a Mesio-occlusal (MO) Class II direct composite restoration, according to the clinical tip?

Occlusal secondary caries Signup and view all the answers

In the context of composite restorations, what reinforces tooth structure, including enamel?

Bonded composite Signup and view all the answers

What does not require bulk for strength in composite restorations, as does amalgam?

External and internal outlines with minimum width and depth Signup and view all the answers

What type of restoration is unnecessary for the removal of a slightly undermined tooth, according to the clinical tip?

Mesio-occlusal (MO) Class II direct composite restoration Signup and view all the answers

What relies on adhesive instead of requiring mechanical retention in composite restorations?

Bonded composite Signup and view all the answers

What is unnecessary for a Mesio-occlusal (MO) Class II direct composite restoration, according to the clinical tip?

Matrix application and placement of the adhesive Signup and view all the answers

What reinforces tooth structure, including enamel, in the context of composite restorations?

Bonded composite reinforcement Signup and view all the answers

What does not require bulk for strength in composite restorations, as does amalgam?

External and internal outlines with minimum width and depth Signup and view all the answers

Which of the following is NOT one of the objectives of cavity preparation for direct posterior composites?

Providing mechanical retention for the restoration Signup and view all the answers

What type of preparations are required for small to moderate Class I direct composite restorations?

Preparations with a scooped-out appearance Signup and view all the answers

In moderate to large Class I direct composite restorations, what areas should be preserved as much as possible?

The cuspal and marginal ridge areas Signup and view all the answers

What provides the retention in tooth preparation for direct posterior composites?

Chemical bonding Signup and view all the answers

Which type of bur is typically used for preparing small to moderate Class I direct composite restorations?

Pear diamond bur Signup and view all the answers

What is the appearance of preparations required for small to moderate Class I direct composite restorations?

Scooped-out appearance Signup and view all the answers

What form should be followed in moderate to large Class I direct composite restorations?

Outline of decay only Signup and view all the answers

Which of the following should be preserved as much as possible in moderate to large Class I direct composite restorations?

The cuspal and marginal ridge areas Signup and view all the answers

What is retained by bonding in tooth preparation for direct posterior composites?

Bonded restorative material to tooth structure Signup and view all the answers

What type of feature is NOT necessary in tooth preparation for direct posterior composites due to the use of bonding?

Mechanical retention features Signup and view all the answers

Class I&amp;II Cavity Preparation for Composite Restoration

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Questions and Answers

What is the purpose of preoperative wedging in the gingival embrassure and bitine rings for Class II direct composite restorations?

What type of tooth preparation design is indicated when only the proximal surface is defective, without any lesions on the occlusal surface?

What is the purpose of the proximal extensions prepared using another instrument with straight sides in a scooped-out appearance prep?

What type of tooth preparation design resembles a more traditional Class II amalgam tooth preparation for moderate to large Class II direct composite restorations?

Why is it contraindicated to use occlusal cavosurface margin bevel in Class II direct composite restorations?

What is the purpose of placing conservative bevels in Class II direct composite restorations?

What is the advantage of using an inverse or internal bevel at the gingival margins in Class II direct composite restorations?

Why is it important to extend the diamond over the DEJ with the tip positioned to create a gingival directed cut inside the DEJ in Class II direct composite restorations?

Why is it not required to extend the proximal box beyond contact with the adjacent tooth in Class II direct composite restorations?

What does holding the diamond over the DEJ with a slightly convex arc outward aim to achieve in Class II direct composite restorations?

Why is it important to maintain enamel margins at the gingival margin during Class II direct composite restorations?

What is indicated if an external cavosurface margin forms a right angle with the tooth surface during Class II direct composite restorations?

What is not required for strength in composite restorations, unlike in amalgam?

According to the clinical tip, what is unnecessary for the removal of a slightly undermined tooth?

Which type of caries is unnecessary for a Mesio-occlusal (MO) Class II direct composite restoration, according to the clinical tip?

In the context of composite restorations, what reinforces tooth structure, including enamel?

What does not require bulk for strength in composite restorations, as does amalgam?

What type of restoration is unnecessary for the removal of a slightly undermined tooth, according to the clinical tip?

What relies on adhesive instead of requiring mechanical retention in composite restorations?

What is unnecessary for a Mesio-occlusal (MO) Class II direct composite restoration, according to the clinical tip?

What reinforces tooth structure, including enamel, in the context of composite restorations?

What does not require bulk for strength in composite restorations, as does amalgam?

Which of the following is NOT one of the objectives of cavity preparation for direct posterior composites?

What type of preparations are required for small to moderate Class I direct composite restorations?

In moderate to large Class I direct composite restorations, what areas should be preserved as much as possible?

What provides the retention in tooth preparation for direct posterior composites?

Which type of bur is typically used for preparing small to moderate Class I direct composite restorations?

What is the appearance of preparations required for small to moderate Class I direct composite restorations?

What form should be followed in moderate to large Class I direct composite restorations?

Which of the following should be preserved as much as possible in moderate to large Class I direct composite restorations?

What is retained by bonding in tooth preparation for direct posterior composites?

What type of feature is NOT necessary in tooth preparation for direct posterior composites due to the use of bonding?

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