Class II Cavity Preparation for Amalgam Restoration

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Questions and Answers

Which is the primary reason for performing a Class II simple cavity preparation?

Malpositioned or rotated tooth

Teeth spacing

Wide embrasure due to senile gum recession

Missing adjacent tooth (correct)

What is the conical pattern of spread of caries in enamel and dentin referred to as?

Radial spread (correct)

Spiral spread

Linear spread

Continuous spread

What is the main advantage of a slot preparation in Class II cavity restoration?

Preservation of proximal contact

Does not alter occlusal relationship

Conservative approach

Minimal risk of injury to adjacent teeth (correct)

What type of carious lesion would be suitable for a Class II simple cavity preparation?

Superficial carious lesion Signup and view all the answers

In what pattern does caries spread in enamel and dentin in Class II simple cavity preparations?

Conical pattern Signup and view all the answers

What should be intact and not undermined by caries in cases suitable for Class II simple cavity preparations?

Ridge Signup and view all the answers

What is the primary disadvantage of slot preparation in Class II cavity restoration?

Alteration of occlusal relationship Signup and view all the answers

Which condition is NOT a potential reason for performing a Class II simple cavity preparation?

(Orthodontically) aligned adjacent teeth Signup and view all the answers

What type of ridge should be intact for a Class II simple cavity preparation?

Marginal ridge Signup and view all the answers

What does Class II simple cavity preparation preserve?

Proximal contact Signup and view all the answers

What type of carious lesion is unsuitable for Class II simple cavity preparation?

Extensive carious lesion Signup and view all the answers

What can a slot preparation potentially injure?

Adjacent tooth Signup and view all the answers

What is the initial depth for the isthmus portion of the cavity preparation?

0.8 mm from the marginal ridge Signup and view all the answers

What is the maximum width of the isthmus portion in the cavity preparation?

¼ the intercuspal distance Signup and view all the answers

What is the purpose of incorporating a reverse or 'S' curve into the cavity preparation?

To create a butt joint margin without destroying excessive tooth structure Signup and view all the answers

What should the gingival floor depth be in relation to the contact area in the proximal portion of the cavity preparation?

0.5 mm below contact area Signup and view all the answers

What is the purpose of placing the cavity margins in the embrasures?

To allow for easier cleaning Signup and view all the answers

What is the purpose of creating mechanical undercuts in the retention form of the cavity preparation?

To provide resistance against dislodgement of the restoration Signup and view all the answers

What instrument is used for finishing the enamel wall in the convenience form of cavity preparation?

Gingival margin trimmer Signup and view all the answers

What type of curve approach is used in case of broad/wide contact areas in the proximal portion?

Reverse curve Signup and view all the answers

What is the minimum width of the isthmus portion in the convenience form of cavity preparation?

¼ the intercuspal distance Signup and view all the answers

What is used to protect the neighboring tooth while accessing the proximal area in cavity preparation?

Matrix band Signup and view all the answers

How are proximal axial grooves prepared for providing retention form?

Using a small round bur ¼ or small tapered fissure bur No. 169 bur. Signup and view all the answers

What is the purpose of extending cavity margins beyond proximal contact in cavity preparation?

To provide additional retention for the restoration Signup and view all the answers

Study Notes

Class II Simple Cavity Preparation

The primary reason for performing a Class II simple cavity preparation is to remove decayed tooth structure and prevent further caries progression.
The conical pattern of spread of caries in enamel and dentin is referred to as the "inverted cone" or "carious triangle".

Advantages and Disadvantages

The main advantage of a slot preparation in Class II cavity restoration is that it allows for easier access and instrumentation of the proximal box.
The primary disadvantage of slot preparation is that it may weaken the tooth.

Carious Lesions and Tooth Condition

A Class II simple cavity preparation is suitable for carious lesions with minimal extension into dentin.
The intact dental ridge is essential for a successful Class II simple cavity preparation.
Class II simple cavity preparation preserves tooth structure.

Cavity Preparation

Caries spreads in a triangular pattern in enamel and a cylindrical pattern in dentin in Class II simple cavity preparations.
The gingival floor should be 0.5-1.0 mm below the proximal contact area.
Incorporating a reverse or 'S' curve into the cavity preparation helps to prevent ledging.
Mechanical undercuts are created in the retention form of the cavity preparation to improve retention.
Cavity margins are placed in the embrasures to facilitate cleaning and prevent plaque accumulation.

Instrumentation and Finishing

An enamel hatchet is used for finishing the enamel wall in the convenience form of cavity preparation.
A broad, sweeping curve approach is used for broad/wide contact areas in the proximal portion.
A protective rubber dam or matrix band is used to protect the neighboring tooth while accessing the proximal area in cavity preparation.

Retention Form and Proximal Axial Grooves

Proximal axial grooves are prepared for providing additional retention form.
The minimum width of the isthmus portion in the convenience form of cavity preparation is 0.5 mm.
The cavity margins are extended beyond the proximal contact area to prevent microleakage.

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Description

Learn about the techniques and procedures for preparing a Class II cavity for amalgam restoration. This quiz covers the steps and considerations involved in treating smooth surface lesions on the proximal surfaces of molars and premolars, addressing the spread of caries in enamel and dentin.