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What is the primary objective of tooth preparation?
What is the main purpose of removing defects during tooth preparation?
Which class of G.V. Black's classification pertains specifically to proximal surfaces of posterior teeth?
Which option best describes a common reason for tooth restoration?
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What aspect of tooth preparation is aimed at preventing fracture under masticatory forces?
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What does G.V. Black's classification help diagnose?
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Which of the following is NOT a part of the working knowledge required for tooth preparation?
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Which restorative material is commonly mentioned as part of the biomaterials knowledge for tooth preparation?
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What is the classification for proximal surfaces of anterior teeth that do NOT include the incisal edge?
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Which class entails the gingival third of the facial or lingual surfaces of all teeth?
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Which term best describes caries found on the root surface of any tooth?
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What is involved in the naming of preparations?
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Which class includes the incisal edges of anterior teeth or the occlusal cusp tips of posterior teeth?
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Which orientation is essential for the walls of preparations to maintain enamel strength?
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What causes Non-Carious Cervical Lesions (NCCL)?
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Which of the following factors is NOT mentioned as impacting preparation design?
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What primarily retains amalgam within a dental preparation?
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What is the purpose of convergence in the context of resin composite restorations?
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Why is divergence important for indirect restorations?
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What is an example of an indirect restoration?
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Which statement best reflects the importance of the tooth preparation procedure?
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What is meant by divergence in dental preparations?
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Which of the following materials typically do not react chemically with tooth structure during placement?
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What is the key factor to consider before initiating any steps in tooth preparation?
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What is the ideal thickness of restorative material for amalgam to resist fracture?
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What is the relationship between isthmus width and intercuspal distance that impacts cusp strength?
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What occurs when there is an extensive carious lesion affecting cusps?
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To maintain enamel strength, what should the direction of wall preparations take into account?
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What is the primary form of retention for amalgam restorations?
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What is the main purpose of convenience form during tooth preparation?
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What influences the clinical decisions regarding the removal of carious tissue?
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Which characteristics describe a converging wall in tooth preparation?
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What should be preserved to maintain the strength of marginal ridges during preparation?
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Which form is associated with composite restorations primarily?
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What should be ensured during the final procedures of debridement and inspection?
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What is the minimum remaining marginal ridge thickness that must be maintained?
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What is the required angle for the cavosurface margin in dental preparations?
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What should be the width of groove extensions in the tooth preparation?
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What is the ideal depth for the pulpal floor at its shallowest point?
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What should the isthmus width be at the cavosurface measured perpendicular to the occlusal table?
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Which of the following describes the internal line angles in the preparation?
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What describes the orientation of the buccal and lingual walls in a dental preparation?
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What effect can remaining debris have on the final restoration?
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During the preparation assessment, what should be included in the occlusal outline?
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Study Notes
Tooth Preparation Objectives
- Conserve as much healthy tooth structure as possible.
- Remove all defects and protect the pulp-dentin complex.
- Form the preparation to withstand mastication forces, preventing tooth/restoration fracture or displacement.
- Enable esthetic placement of restorative material when necessary.
Tooth Preparation Principles
- Understand tooth morphology (enamel, dentin, pulp).
- Have knowledge of cariology.
- Be familiar with various biomaterials, including amalgam, composite, ceramics, gold, and pulp protection materials.
- Understand instrumentation, including handpieces, burs, and hand instruments.
G.V. Black Classification System
- Used for diagnosing caries and identifying preparations/restorations.
- Class I: Pit and fissure lesions on occlusal surfaces of premolars/molars, occlusal two-thirds of facial/lingual surfaces of molars, and lingual surfaces of maxillary incisors.
- Class II: Proximal surfaces of posterior teeth (can include multiple surfaces).
- Class III: Proximal surfaces of anterior teeth, excluding the incisal edge.
- Class IV: Proximal surfaces of anterior teeth, including the incisal edge.
- Class V: Gingival third of facial/lingual surfaces of all teeth (may be referred to as smooth surface caries).
- Class VI: Incisal edges of anterior teeth or occlusal cusp tips of posterior teeth.
Additional Carious and Non-Carious Lesions
- Root surface caries: Caries on the root surface of any tooth.
- Non-Carious Cervical Lesion (NCCL): Caused by abrasion, erosion, and abfraction.
Naming Tooth Preparations
- Use the capitalized first letter of each involved tooth surface.
- Additional surfaces are also capitalized.
- Examples: O (occlusal), MOB (mesio-occlusal-buccal), MOD (mesio-occlusal-distal), DO (disto-occlusal).
Tooth Preparation Design
- Takes into account tooth structure and the chosen restorative material.
Factors Impacting Preparation Design
- Enamel Rod Orientation: Preparation walls should be oriented at least 90 degrees to the external enamel surface to maintain dentinal support.
- Amalgam: Converging walls retain the material due to its hardening properties.
- Composite: Converging walls help retain the composite after curing with a light.
- Divergent Walls: Walls that move further apart (opposite of converging) are necessary for indirect restorations (e.g., gold and ceramic inlays/onlays) to allow them to be tried in and removed before final cementation.
Tooth Preparation Procedure
- Step 1: Outline form: Define the preparation's boundaries based on the extent of the lesion.
- Step 2: Primary resistance form: Shape the preparation to resist occlusal forces and prevent fracture of the tooth or restoration.
- Step 3: Primary retention form: Design the preparation to resist displacement or removal of the restoration from tipping or lifting forces.
- Step 4: Convenience form: Provide adequate access and visibility for preparation and restoration.
- Step 5: Removal of defective restorative material and/or soft dentin: Remove caries and defective restorations.
- Step 6: Placement of the restorative material: Insert the chosen material.
- Step 7: Contouring: Shape and smooth the restoration to the tooth anatomy.
- Step 8: Finishing and polishing: Refine the restoration for a smooth, esthetic surface.
- Step 9: Debridement and inspection: Clean the preparation and ensure proper design.
Preparation Assessment
- Occlusal outline: Smooth, flowing shape, centered on the central groove, maintaining at least 1.5mm of marginal ridge.
- Groove Extensions: Slightly divergent, extend halfway up grooves, 1mm wide.
- Triangular ridges, cusps, and marginal ridges: Not compromised or undermined.
- Isthmus width: 1.25mm wide at the cavosurface.
- Margins: Cavosurface angle of 90 degrees or more, smooth, continuous, well-defined, no unsupported enamel or bevels.
- Pulpal floor: 1.5mm deep at the shallowest point, flat, parallel to the occlusal table.
- Buccal/Lingual Walls: Slightly convergent occlusally towards the long axis of the crown.
- Mesial/Distal Walls: Slightly divergent occlusally towards the long axis of the crown.
- Walls and floors: Smooth
- Internal line angles: Well-defined, smooth, and rounded.
- No damage to the prepared tooth, adjacent teeth, or soft tissue.
Key Points
- Amalgam: Retained by converging walls.
- Composite: Retained by micro-mechanical retention through bonding.
- Indirect restorations: Rely on diverging walls and cementation/bonding.
- Isthmus width: Narrower isthmus is less likely to result in cusp fracture.
- Debridement: Thorough cleaning after preparation is crucial for a successful restoration.
- Marginal ridge: Conserve as much as possible for strength.
Critical Errors
- Recognize and avoid any errors in preparation to ensure proper restoration.
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Description
Explore the objectives and principles of tooth preparation while understanding the G.V. Black classification system for caries diagnosis. This quiz covers key aspects of tooth morphology, cariology, biomaterials, and instrumentation essential for effective dental restorations.