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)
What are cervical caries?
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What is the #1 cause of cervical caries?
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What is abrasion?
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What is abfraction?
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What causes erosion in teeth?
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Is there a prep with GI restorations?
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What are the requirements for amalgam prep for Class V?
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What is included in composite prep for Class V?
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What are the steps to place a GI?
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What are the composite prep steps for Class V?
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What are the internal walls of Class V composite prep like?
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Where are Class V bevels located?
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What should be done before starting prep?
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What burs are used for prep?
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How should composite be applied?
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What is the occlusal depth for Class V composite?
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What is the gingival depth for Class V composite?
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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.
