Questions and Answers
What is Class I cavity?
What is Class II cavity?
What does Class III cavity involve?
What distinguishes Class IV cavity?
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What area does Class V cavity affect?
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What does Class VI cavity refer to?
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What defines a simple cavity?
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What defines a compound cavity?
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What defines a complex cavity?
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List the elements of cavity preparations.
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What does the preparation of the tooth form?
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What is a wall in cavity preparation?
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What are the types of walls in a cavity prep?
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What defines a cavity wall?
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What is an internal wall?
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What is the external wall?
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What is the axial wall?
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What is the pulpal wall?
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What are line angles?
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What are point angles?
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What is the cavosurface margin?
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What is the outline form?
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What is resistance form?
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What is retention form?
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What is convenience form?
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What is the removal of carious dentin?
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What is the finishing or refinement of the cavity preparation?
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What is cleansing or debridement?
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Study Notes
Cavity Classification
- Class I: Developmental cavities found in pits and fissures on occlusal surfaces of posterior teeth, molars' buccal or lingual pits, and lingual pits of maxillary incisors.
- Class II: Cavities located on the proximal surfaces of posterior teeth.
- Class III: Cavities affecting interproximal surfaces of anterior teeth.
- Class IV: Similar to Class III but also involves the incisal edge of anterior teeth.
- Class V: Cavities on the cervical third of facial or lingual surfaces, often due to sweet consumption.
- Class VI: Not part of original classifications; identifies cavities on incisal or occlusal surfaces due to abrasion.
Cavity Types
- Simple Cavity: Involves one tooth surface.
- Compound Cavity: Involves two surfaces of a tooth.
- Complex Cavity: Involves three or more surfaces of a tooth.
Elements of Cavity Preparations
- Include outline form, resistance form, retention form, convenience form, finishing/refinement, and cleansing/debridement.
- All elements are essential during cavity prep.
Tooth Preparation Forms
- Builds walls, lines, and angles in the cavity.
Walls of Cavity Preparation
- Defined as sides or floors of the cavity, named after adjacent tooth surfaces:
- Axial Wall: Runs parallel to the tooth's long axis.
- Pulpal Wall: Also known as the pulpal floor, is perpendicular to the long axis.
- Gingival Wall: Nearest to the gingiva, perpendicular to the long axis.
- Internal Wall: Does not extend to external tooth surfaces.
- External Wall: Extends to the tooth's external surface, named by the surface it involves.
Cavity Structure
- Line Angles: Junctions of two walls in cavity prep.
- Point Angles: "Corners" formed by the junction of three walls.
- Cavosurface Margin: Angle formed where cavity walls meet unprepared tooth surface; critical for preventing leakage.
Cavity Preparation Forms
- Outline Form: Overall shape determined by decay extent and restorative material, stays within cavosurface margin.
- Resistance Form: Internal shape protects from masticatory stresses; involves shape and placement of walls.
- Retention Form: Shape that retains restoration; often includes undercutting walls for mechanical locking in amalgam preparations.
- Convenience Form: Access form necessary for instrumentation and restoration placement, often expanding beyond outline form.
Removal of Carious Dentin
- Involves cutting tooth structure using instruments like enamel hatchets, chisels, and spoon excavators.
Final Cavity Preparation Steps
- Finishing/Refinement: Final planning of cavity walls before restoration.
- Cleansing/Debridement: Removal of debris through spraying and rinsing, typically using high-volume evacuation and air/water syringes.
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Description
Test your knowledge on cavity classifications, including Class I through VI, and the characteristics of simple, compound, and complex cavities. Additionally, explore the elements involved in cavity preparations. Perfect for dental students and practitioners alike!