Class V Restorations Overview

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Questions and Answers

What is a Class V restoration?

Restorations involving the cervical 1/3 of the facial or lingual aspect of any tooth (usually anterior or bicuspid).

Class Vs involves the?

Facial aspect of anterior and bicuspid teeth.

Why are Class V restorations performed? (Select all that apply)

Abrasion (correct)

Caries (correct)

Erosion (correct)

Abfraction (correct)

Combination of above (correct)

What are cervical caries?

Commonly below CEJ, can be irregularly shaped, chronic = darker. Signup and view all the answers

What is the #1 cause of cervical caries?

Poor hygiene. Signup and view all the answers

What is abrasion?

Caused by mechanical wear (like by toothbrush for example), tends to have dished out appearance with rounded cavo-surface edge. Signup and view all the answers

What is abfraction?

Combination of abrasion and micro fractures = stress corrosion. Signup and view all the answers

What causes erosion in teeth?

Caused by chemical dissolution of enamel. Signup and view all the answers

Is there a prep with GI restorations?

False Signup and view all the answers

What are the requirements for amalgam prep for Class V?

Undercuts, retention, and angular outlines w/ a butt joint. Signup and view all the answers

What is included in composite prep for Class V?

Bevels on enamel and retention grooves in dentin w/ a butt joint. Signup and view all the answers

What are the steps to place a GI?

<ol> <li>Apply polyacrylic acid for 30s, 2. Rinse and dry well, 3. Apply GI + cure, 4. Use bur + H2O to remove excess, 5. Apply resin coat.</li> </ol> Signup and view all the answers

What are the composite prep steps for Class V?

<ol> <li>Occlusal and gingival walls converge, 2. Retention groove in dentin at least .5mm from cavo-surface, 3. Beveled enamel approx 1mm long cut at 45 degrees, 4. Maintain 90 degree joint without bevel in dentin.</li> </ol> Signup and view all the answers

What are the internal walls of Class V composite prep like?

Rounded and converging occlusal/gingival. Signup and view all the answers

Where are Class V bevels located?

In enamel, do not extend beyond line angle, may be larger on occlusal, NEVER placed on dentin if below the CEJ. Signup and view all the answers

What should be done before starting prep?

Isolate with rubber dam or retraction cord and cotton rolls. Signup and view all the answers

What burs are used for prep?

1/4 round - retention grooves, 34D - initial cut, 330D - refined cut, 132F - bevels. Signup and view all the answers

How should composite be applied?

In 2 mm increments. Signup and view all the answers

What is the occlusal depth for Class V composite?

Occlusal depth = 1-1.25mm. Signup and view all the answers

What is the gingival depth for Class V composite?

Signup and view all the answers

Study Notes

Class V Restorations Overview

Class V restorations address the cervical third of the facial or lingual surfaces on any tooth, typically anterior or bicuspids.
Key purposes for these restorations include the treatment of caries, abrasions, abfractions, erosion, or a combination of these issues.

Cervical Caries

Cervical caries often develop below the cemento-enamel junction (CEJ) and can present irregularly.
Chronic cervical caries may appear darker compared to acute forms.

Causes of Cervical Caries

Poor oral hygiene is the primary cause of cervical caries.
Other contributing factors include exposed roots, defective restoration margins, reduced salivary flow, and exposure due to irradiation.

Types of Damage

Abrasion: Mechanical wear from tools like toothbrushes, causing a dished appearance with rounded edges.
Abfraction: A mix of abrasion and stress fractures, displaying sharp "V-cut" notches, often due to occlusal forces or habits.
Erosion: Chemical breakdown of enamel resulting in thin, translucent, and polished surfaces; often linked to diet, eating disorders, or gastric issues.

Restoration Preparations

Glass ionomer (GI) restorations require minimal preparation—only light smoothing of the tooth structure and no extensive drilling.
Amalgam preparations entail creating undercuts and angular outlines with a butt joint.
Composite preparations involve bevels on enamel, retention grooves in dentin, and specific joint angles; care must be taken near the CEJ.

GI Restoration Process

Begin by applying polyacrylic acid to condition the dentin for better bonding.
Rinse thoroughly, then apply GI material, followed by curing.
Use a 12-fluted bur to eliminate excess material, then finish with a resin coat.

Composite Restoration Steps

Ensure walls converge at the occlusal and gingival areas.
Retention grooves should be at least 0.5mm from the cavo-surface.
Create a 1mm long, 45-degree bevel on enamel, avoiding beveling on the gingival floor if near the CEJ.

Bevels and Internal Walls

Bevels should only be placed in enamel and must not cross into dentin or beyond line angles.
Internal walls of composite preparations should have rounded and converging features.

Preparation Considerations

Isolate the area with a rubber dam or retraction system to prevent contamination during the procedure.
Specific burs are used for different steps: 1/4 round for retention grooves, 34D for the initial cut, 330D for refinement, and 132F for bevels.

Composite Application

Composite resin should be applied in 2mm increments to minimize the risk of contraction gaps, which lead to microleakage and restoration failure.
Recommended occlusal depth for Class V composites is between 1-1.25mm, with specific gingival depth guidelines as well.

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Description

This quiz focuses on Class V restorations, which are crucial for treating cervical third issues in teeth. Key topics include cervical caries, their causes, types of damage, and the significance of proper oral hygiene. Test your understanding of these restorative techniques and their implications for dental health.