Questions and Answers
What are Class III caries?
What is the classic preparation for Class III?
Extends 0.5mm into dentin as does a classic amalgam preparation
The outline form of Class III preparations generally starts __ the contact point.
just below
Is it necessary to break facial contact in Class III preparations?
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What should be the axial depth of a Class III preparation?
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What is the resistance form in Class III preparations?
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What are the nine steps in cavity preparation for Class III?
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Which method is used for retention in Class III fillings?
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To prevent erosion, one should avoid ____ foods.
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What is an indication for Class V preparations?
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Class V carious lesions only occur on the lingual surface.
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Study Notes
Class III Overview
- Class III caries involve smooth surface lesions on proximal areas of incisors and canines.
- Initial lesions appear V-shaped and develop laterally at the dentin-enamel junction (DEJ).
- Detection methods include radiography, visual inspection, and transillumination.
Class III Preparation
- Classic preparation extends 0.5mm into dentin; modifications may allow enamel-only finishing in some cases.
- Maintaining the integrity of the incisal edge is crucial to prevent fractures.
- Preparation shape might be influenced by proximity to the incisal edge.
Class III Composite Preparations
- Steps in cavity preparation include: outline form, resistance form, retention form, removing decay, pulp protection, finishing the cavosurface, and ensuring cleanliness.
Outline Form
- Represents the outer shape of the cavity and includes decay removal.
- Cavity margins must connect with healthy tooth structure, maintaining contact with adjacent teeth at the gingival margin.
Initial Entry Technique
- Utilize a #330 bur positioned perpendicular to the lingual surface and make entry gingival to the contact area.
Resistance and Retention Forms
- Resistance form prevents fractures through internal shape; the axial wall resides in dentin at 0.5mm depth.
- Retention form holds fillings in place using acid-etching without requiring undercuts.
Margination Techniques
- Cavosurface margins should meet at 90 degrees without bevels for optimal strength and esthetics.
Class V Lesions Overview
- Class V lesions can arise from caries, abrasions, erosions, or abfractions, typically affecting the cervical third of the tooth.
- Outline forms correlate with tooth diameter and follow the contour of the cementoenamel junction (CEJ).
Erosion and Abrasion
- Abrasion often results from hard toothbrushes and abrasive pastes; its clinical manifestation is a well-defined V-shaped notch.
- Erosion is a chemical process leading to smooth, dish-shaped loss of tooth structure, commonly from acidic foods.
Abfraction
- Caused by flexure forces leading to micro-fractures at the tooth neck, often seen in bruxers, presenting as V or wedge-shaped defects.
Clinical Management
- Potential surgical intervention for non-carious lesions involving teeth sensitivity; esthetics can also be a significant factor.
- Carious lesion detection involves assessing soft or leathery textures for active lesions versus hard, shiny textures for inactive lesions.
Class V Preparations
- Preparations are determined by the extent of caries, often requiring no classic form for non-carious abrasions or erosions.
- Amalgam preparations require retention grooves in dentin, while composites necessitate beveled enamel margins.
Choosing Restorative Materials
- Consider isolation capabilities, esthetic requirements, and moisture control for material selection. Moisture cannot be managed, composites are unsuitable.
Protection of Pulp
- Amalgam utilizes Resin Modified Glass Ionomer (RMGI) for pulp protection; composites involve etching and bonding agents to maintain vitality.
Tooth Fracture Classification
- Classifications include uncomplicated and complicated fractures based on the involvement of enamel, dentin, and pulp.
- Crowns can sustain fractures in varying degrees, classified into classes I (enamel only) to IV (complete crown loss).
Rubber Dam Isolation
- For tooth #20, quadrant rubber dam isolation should extend from tooth #18 to #25 for effective moisture control.
Important Points About Caries and Class IV
- Caries genesis involves bacterial acid production leading to demineralization.
- Class IV causes include caries, trauma, and anatomical defects, warranting proper management in restorative dentistry.
Finishing Techniques
- Finishing involves the use of sequential disks, finishing burs, and sandpaper strips to achieve a smooth restoration surface.
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Description
This quiz features flashcards focusing on Class III cavities and preparations. It encompasses definitions, characteristics, and methods for detecting these types of caries. Ideal for dental students seeking to reinforce their understanding of restorative dentistry.
