Class 3 Prep Dental: Practice Quiz and Flashcards

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Questions and Answers

What is the purpose of using a wedge guard or metal matrix when breaking the proximal wall in a Class II cavity preparation?

To improve matrix band insertion

To protect the adjacent tooth (correct)

To enhance adhesion

To facilitate caries removal

What is the benefit of removing the sharp external cavosurface margin?

To make restoration easier and more predictable

To improve proximal clearance

To remove loose enamel rods and enhance adhesion (correct)

To facilitate matrix band insertion

What is the purpose of using a flame diamond in Class II cavity preparation?

To remove loose enamel rods and enhance adhesion (correct)

To remove old restorations

To polish the cavity margin

To remove infected dentin

Which bur is used for conservative opening of suspect grooves?

Very small-diameter flame bur Signup and view all the answers

What is the purpose of using an Arkansas stone in Class II cavity preparation?

To polish the cavity margin Signup and view all the answers

What technique can simplify matrix band insertion and work for minor interproximal beveling?

Margin separation technique Signup and view all the answers

What is the purpose of using a tungsten carbide rosehead bur in Class II cavity preparation?

To remove infected dentin Signup and view all the answers

When should the supragingival protocol be employed?

When caries approaches the gingival margin Signup and view all the answers

What is the primary reason for administering anaesthesia during a proximal caries restoration procedure?

To reduce salivary flow and enhance bonding Signup and view all the answers

When restoring a proximal caries lesion, what is the purpose of inserting a wedge in the area beforehand?

To help re-establish the proximal contact with composite Signup and view all the answers

What is the primary purpose of tooth preparation in a proximal caries restoration?

To determine the tooth's design Signup and view all the answers

Which of the following matrix systems is designed for use in anterior teeth restorations?

Manauta Custom Ring Signup and view all the answers

What is the primary purpose of isolating the area during a proximal caries restoration?

To permit effective bonding Signup and view all the answers

What type of wedge is commonly used in proximal caries restorations?

All of the above Signup and view all the answers

What is the primary purpose of restoring the proximal wall during a proximal caries restoration?

To re-establish the proximal contact with composite Signup and view all the answers

What is the primary consideration when selecting a composite shade for a proximal caries restoration?

The shade of the adjacent tooth Signup and view all the answers

When preparing a Class III cavity, what is the recommended direction of the cutting instrument?

Perpendicular to the enamel Signup and view all the answers

What is the maximum recommended thickness of composite increments in a Class III restoration?

2mm Signup and view all the answers

What is the purpose of using a mylar strip in a Class III restoration?

To create the proximal anatomy Signup and view all the answers

When removing interproximal excess material in a Class III restoration, what instrument should be used in the gingival area?

A No. 12 surgical blade Signup and view all the answers

What is the recommended location of the point of entry when preparing a Class III cavity?

Within the incisogingival dimension of the lesion Signup and view all the answers

What is the recommended instrument to use when initiating a Class III cavity preparation?

A round bur Signup and view all the answers

When using a finishing strip to contour and smooth a Class III restoration, what part of the strip should be used first?

The grit-free middle portion Signup and view all the answers

What is the recommended direction of motion when using a finishing strip to contour and smooth a Class III restoration?

Buccally and lingually Signup and view all the answers

Study Notes

Proximal Caries Restoration

Anaesthesia is usually necessary for patient comfort and to decrease salivary flow during the procedure
The restoration involves selecting the composite shade before the tooth is dehydrated and lightened
The area must be isolated to permit effective bonding

Class III Preparation

The preparation is initiated from a lingual approach using a round bur instrument
The bur is positioned for entry and rotated at high speed using air-water spray
The point of entry is located within the incisogingival dimension of the lesion or defect and as close to the adjacent tooth as possible
The cutting instrument is directed perpendicular to the enamel
Incorrect entry overextends the lingual outline and unnecessarily weakens the tooth

Composite Restoration

Place composite into the most facial portion of the preparation, beginning at the facial-axial line angle
Increments of composite should be no more than 2mm thick
Use the index finger to hold down on the facial portion of the mylar strip and wrap the lingual portion over the lingual contour of the tooth to create the proximal anatomy

Finishing and Polishing

Remove gross excess material or overhang as needed
Use the more abrasive side of the finishing strip to reduce interproximal excess
Insert the finishing strip by the grit-free middle portion and move it buccally and lingually to contour and smooth
Do not use the finishing strip in the contact area
Use a No. 12 surgical blade or scaler to remove interproximal excess material in the gingival area

Cavity Preparation and Removal

Remove caries until all infected dentin has been removed
When breaking the proximal wall, use a wedge guard or a metal matrix to protect the adjacent tooth
Protect the external fluoride-rich layer to avoid the increased possibility of caries
Full interproximal clearance is not mandatory for Class II cavities

Matrix and Wedges

Use a wedge guard or a metal matrix to protect the adjacent tooth
A margin separation technique can simplify matrix band insertion and work for minor interproximal beveling
Placing a wedge to separate the tooth and a matrix band may be all that is necessary
Another possibility is to pre-separate the teeth by placing a ring in advance of the cavity preparation

Class II Cavity

When caries approaches the gingival margin, the supragingival protocol should be employed
Minimally invasive removal of caries and old restorations and enamel preservation techniques will make restoring easier, more predictable, and healthier for the periodontium
Remove the sharp external cavosurface margin throughout, to remove loose enamel rods and enhance adhesion using a flame diamond

Essential Burs

Very small-diameter flame bur (FG; 006–008): used for conservative opening of suspect grooves
Cylindric bur with rounded head (FG; 007–0014): used for most Class 1 and 2 cavity preparations
Tungsten carbide rosehead bur (CA; 010–020): used to remove infected dentin
Fine-grained flame bur (FG; 010): used to finish Class 2 box walls
Arkansas stone (FG): used to smooth the cavity margin
Brownie polisher (CA): used to polish the cavity margin

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Description

Learn about the preparation process for Class III cavities in dentistry, including the use of round bur instruments and air-water spray.

Class III Preparation in Dentistry

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