Questions and Answers
What is Class III lesions?
Proximal surface of anterior teeth, usually incisor and canines, smooth surface anterior only, point of origin is gingival to contact but can grow beyond.
What does Class III lesions not involve?
Does not involve an incisal angle like mesial incisal or distal incisal, no pits or grooves.
What would you do if the caries lesion involves an incisal edge?
Change classification.
Class III preparation is used with what type of material?
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What instrument can you use to detect the caries lesion?
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What are some Class III carious lesions?
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What are some classifications for Class III lesions?
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What are the types of Class III lesions by tooth structure involved?
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What are the 3 types of Class III lesions by access?
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What shape does the prep make when viewed from the proximal view and from lingual view?
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What is incipient enamel caries?
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What is cavitated enamel caries?
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What is the definition of cavitation?
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What kind of prep do you use?
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What kind of bur would you use?
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Composite restoration requires mechanical retention.
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What is the depth, location, and outline form of a Class III prep?
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What are enamel and dentin lesions?
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What technique would you use for root surface caries with no gingival enamel for bonding?
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What are some initial prep steps?
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Cotton roll isolation is an effective way to isolate.
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How would you create an outline form?
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What is the depth of the prep?
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How do you want the facial margin on the prep?
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What is the purpose of the caries outline?
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What is beveling the margins?
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What is the purpose of beveling the enamel?
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Do you bevel thin enamel?
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Historically, what are some restorative materials for Class III?
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Restoration of silver amalgam vs. silicate cement vs. composite vs. gold foil.
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Where do you primarily use amalgams on Class III?
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Study Notes
Class III Lesions Overview
- Class III lesions affect the proximal surfaces of anterior teeth, specifically incisors and canines.
- These lesions remain as smooth surfaces and originate gingival to the contact point, potentially extending beyond.
Characteristics of Class III Lesions
- Do not involve an incisal angle, distinguishing them from mesial-occlusal (MO) or distal-occlusal (DO) cavities.
- Utilize composite, gold foil, or amalgam for Class III preparations.
Diagnosing Lesions
- Detection methods include radiographs, explorers, and transillumination using light.
- Prominent examples of Class III carious lesions include those on teeth #7 (mesial) and #8 (distal), as well as #9 (distal) and #10 (mesial).
Classification of Lesions
- Class III lesions can be classified based on the structure involved (enamel only, enamel & dentin, enamel, dentin & cementum) and access type (facial only, lingual only, or through & through).
Preparation and Technique
- The outline form is C-shaped when viewed from both proximal and lingual perspectives.
- Incipient caries are V-shaped, non-cavitated, typically dormant, and limited to enamel.
- Cavitated caries indicate irreversible damage, marked by shallow cavities that may not be aesthetically pleasing.
Cavitation and Treatment
- Cavitation signals a critical transition where plaque-induced mineral loss allows bacteria to invade deeper tooth structures.
- Conservative prep techniques focus on preserving healthy tooth structure, primarily using composite material.
Instruments and Initial Steps
- Recommended tools for preparation include a #2 round bur (diamond or carbide) and appropriate isolation methods such as a rubber dam.
- Preparation depth should be uniform, measuring 1.25 to 1.5 mm wide, maintaining at least 0.5 mm clearance from adjacent teeth.
Margins and Beveling
- The facial margin should be slightly visible, with the axial wall being flat or slightly convex.
- Beveling enamel margins at a 45-degree angle promotes aesthetic bonding and ensures the removal of unsupported enamel, but thin enamel should remain unbeveled to avoid exposing dentin.
Historical Materials and Applications
- Historically used restorative materials include gold foil, amalgam, silicate cement, and composite, each with unique advantages and limitations in longevity and aesthetics.
- Amalgams are primarily applied to the distal surfaces of canines and the proximal surfaces of mandibular incisors, remaining advantageous due to poor bonding surfaces.
Key Considerations for Restoration
- Restoration selection should prioritize functionality and aesthetic considerations, factoring in service longevity and bonding strength peculiarities of each material used.
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Description
Test your knowledge of Class III cavity preparations with these flashcards. Each card covers essential definitions and concepts related to Class III lesions, including their characteristics and treatment considerations. Perfect for dental students and professionals looking to refresh their knowledge.
