Class II Cavity Preparations Quiz

Questions and Answers

Class II cavities originate on the _______ surfaces of premolars and molars.

proximal

What are different types of Class II cavity preparations?

slot, conventional: MO/DO, MOD, complex

What are the advantages of a slot prep?

minimally invasive, resistance

What are the different slot prep variations?

1 contact, M/D, Modified 1 contact Signup and view all the answers

It is okay to leave non-carious grooves or pits ______!

unrestored Signup and view all the answers

What is the occlusal outline form for amalgam Class II cavity preparations?

Include only the carious grooves if fissure is not sealable. No sharp corners. Signup and view all the answers

Proximal outline form: Break contact buccal, lingual, and gingival walls approximately _____ mm.

0.5 Signup and view all the answers

Buccal and lingual walls should be parallel or slightly ______.

convergent Signup and view all the answers

Resistance form prevents dislodgment or fracture of the restoration or fracture of the remaining tooth structure by oblique or ______ forces.

compressive Signup and view all the answers

How does retention form prevent dislodgement of the restoration along the path of insertion?

depth of cavity, convergent box form, relationship of opposing walls and retention features Signup and view all the answers

What is the axial extension of the gingival box for premolars and molars?

Premolars: 1 mm, Molars: 1.2-1.5 mm Signup and view all the answers

How should the gingival floor be established?

Establish gingival floor just below the caries. Just break contact with adjacent tooth gingivally. Tip of your explorer rule 0.5 mm separation. Signup and view all the answers

Why must enamel spurs be removed?

To create a 90 degree cave surface margin for amalgam. Signup and view all the answers

Cave surface margin needs to be at ___ degrees to avoid undercutting enamel rods.

90 Signup and view all the answers

What are retention grooves?

Extension of axial wall NOT into axial wall, cut into facial and lingual axio line angles, do not cut into axial wall to avoid pulp, cut on upstroke. Signup and view all the answers

What might recurrent decay around amalgam restorations be indicative of?

Inadequate retention form Signup and view all the answers

Why do we burnish the matrix at the contact area?

To impart a convex contour to the matrix band. Signup and view all the answers

What is considered clinically acceptable for the axial wall?

Convex, follows contour of F/L on the M/D Signup and view all the answers

What is the clinically acceptable width for gingival seat M/D for molars?

1.2-1.5 mm Signup and view all the answers

What is important for clinically acceptable proximal box and cavosurface?

Slight 6 degree convergence of occlusal and proximal walls, occlusal walls form 90 degree angle to cavosurface margins, no unsupported enamel. Signup and view all the answers

What is the requirement for clinically acceptable retention?

Retention grooves placed in axiolingual and axiofacial line angles, from base of gingival floor to level of pulpal floor, 0.25 mm in depth. Signup and view all the answers

What are clinical requirements for proximal and gingival preparation?

Facial and lingual contact (M or D) broken 0.3-0.5 mm, can pass tip of explorer; depth of prep is determined by distance required to break gingival contact. Signup and view all the answers

Why do we pre-wedge?

Protect gingival tissue and adjacent tooth, space for development of occlusal embrasure, eases insertion of matrix following prep. Signup and view all the answers

Study Notes

Class II Slot Preparation Key Concepts

Class II cavities are found on the proximal surfaces of premolars and molars.
Types of Class II cavity preparations include slot, conventional (MO/DO, MOD), and complex.

Advantages of Slot Preparation

Minimally invasive approach reduces tooth structure removal.
Increased resistance to fracture; larger isthmus correlates with a higher fracture risk.

Slot Preparation Variations

Variants include 1 contact, M/D, and modified 1 contact.

Non-carious Structures

Non-carious grooves or pits can be left unrestored.

Occlusal Outline Form for Amalgam Cavity Preparations

Focus on carious grooves when fissures are sealable; avoid sharp corners.

Proximal Outline Form Specifications

Break contact on buccal, lingual, and gingival walls by approximately 0.5 mm.

Wall Orientation

Buccal and lingual walls must be parallel or slightly convergent.

Resistance Form Characteristics

Prevent displacement or fracture from oblique or compressive forces with flat floors and rounded line angles.

Retention Form Requirements

Prevent dislodgment of restoration along the insertion path through cavity depth, box form convergence, and effective wall relationships.

Axial Extension Guidelines

Premolars: 1 mm, Molars: 1.2-1.5 mm for axial extension of the gingival box.

Establishing Gingival Floor

Place gingival floor just below caries, ensuring 0.5 mm separation with the adjacent tooth using an explorer tip.

Importance of Removing Enamel Spurs

Necessary for achieving a 90-degree cavosurface margin for amalgam restorations.

Cavosurface Margin Angle

Must be at a 90-degree angle to prevent undercutting of enamel rods.

Retention Groove Specifications

Extend from the axial wall to the facial and lingual axio line angles, avoiding pulp by cutting on the upstroke.

Recurrent Decay Indications

Presence of recurrent decay around amalgam restorations may signify inadequate retention form.

Matrix Contouring Technique

Burnishing the matrix band at the contact area creates a convex contour, assisting in achieving a larger contact area.

Acceptable Axial Wall Profile

The axial wall should be convex and follow the contours of the facial and lingual surfaces.

Acceptable Gingival Seat Width

Molar: 1.2-1.5 mm; Premolar: 1.0 mm for gingival seat width.

Proximal Box and Cavosurface Requirements

Slight convergence (6 degrees) of occlusal and proximal walls, occlusal walls must form a 90-degree angle to cavosurface margins, and no unsupported enamel should remain.

Acceptable Retention Groove Placement

Groove depths of 0.25 mm extending from the base of the gingival floor to the level of the pulpal floor.

Contact Break Specifications

Facial and lingual contacts (M or D) should be broken by 0.3-0.5 mm, with the depth of preparation determined by gingival contact break distance, and axial wall height should exceed 1.5 mm.

Purpose of Pre-wedging

Protects gingival tissue and adjacent teeth, creates room for occlusal embrasure, and facilitates matrix insertion, while preserving tooth strength with a smaller outline form.

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Description

Test your knowledge about Class II cavity preparations with this informative quiz. Covering definitions, advantages, and types of cavity preps, it's perfect for dental students and professionals alike. Prepare effectively for your examinations with these flashcards.