Class II Cavity Preparation
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Questions and Answers

What type of restorations typically require a single increment in slot preparations?

Class II and III restorations

What is essential for improving adhesion of glass ionomer to dentin in conventional glass ionomer systems?

Mild dentin conditioning to remove the smear layer

Why is a thin coat of light-cured, resin-based coating applied on the surface of a conventional glass ionomer restoration?

To limit dehydration and resultant disintegration (cracking) of the restoration during the initial setting phase

What is a disadvantage of glass ionomer restorations in terms of esthetics?

<p>The esthetic is not as good as composite</p> Signup and view all the answers

What is an advantage of glass ionomer restorations in terms of thermal expansion?

<p>The linear coefficient of thermal expansion is almost similar to that of the tooth</p> Signup and view all the answers

What type of restorations are contraindicated for glass ionomer materials?

<p>Typical Class I, II, and IV restorations, and Class II or III (involving proximal contact) restorations</p> Signup and view all the answers

What is the main purpose of the dovetail in a Class II cavity preparation?

<p>To provide retention for the amalgam, ensuring it is locked into the cavity.</p> Signup and view all the answers

What is the primary reason for beveling the gingival floor in a Class II preparation?

<p>To remove unsupported enamel rods and prevent fracture.</p> Signup and view all the answers

What is the minimum clearance required for a proximal box in a Class II preparation?

<p>1mm</p> Signup and view all the answers

What is the purpose of the reverse curve or S curve in a proximal box?

<p>To increase bulk to the amalgam and prevent fracture.</p> Signup and view all the answers

What is the principle behind the design of the occlusal box in a Class II preparation?

<p>Retention, as the amalgam has to be locked into the cavity.</p> Signup and view all the answers

What is the significance of the axial wall in a proximal box?

<p>It provides bulk for the amalgam and protection for the pulp.</p> Signup and view all the answers

Why is it important to conserve tooth tissue during a Class II preparation?

<p>To preserve the strength of both tooth tissue and amalgam.</p> Signup and view all the answers

What is the purpose of the proximal retentive groove?

<p>To prevent dislodgement of the amalgam restoration.</p> Signup and view all the answers

Why is it important to have a beveled CSM in a Class II preparation?

<p>To remove unsupported rods on enamel and prevent fracture.</p> Signup and view all the answers

What is the significance of the pulpal floor in a Class II preparation?

<p>It provides a flat surface for the amalgam and helps to distribute stress.</p> Signup and view all the answers

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