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Tooth Preparation Fundamentals

Basic Principles

Biological Considerations

Preserve tooth structure
Protect the pulp
Consider the periodontium
Maintain occlusal relationships

Mechanical Principles

Provide adequate retention form
Ensure resistance form
Consider stress distribution
Plan for margin placement

Initial Tooth Preparation

Outline Form

Establish external boundaries
Extend to sound tooth structure
Include all caries and defects
Maintain marginal ridge strength

Resistance Form

Flat, level pulpal floor
Box shape with parallel walls
Rounded internal line angles
Adequate thickness of restorative material

Black's Classification of Cavity Preparations

Class	Location	Key Features
I	Pits and fissures	Occlusal surfaces, buccal/lingual pits
II	Proximal surfaces of posterior teeth	Involves one or both proximal surfaces
III	Proximal surfaces of anterior teeth	Doesn't involve incisal angle
IV	Incisal edges of anterior teeth	Involves incisal angle or edge
V	Gingival third of facial/lingual	Non-carious cervical lesions
VI	Cusp tips/incisal edges	Wear or trauma cases

Clinical Tips

Remember: Always start with proper isolation and use appropriate burs and hand instruments.

Maintain proper water cooling to prevent thermal damage
Check preparations with direct vision and tactile sensation
Confirm proper occlusal clearance
Use magnification when necessary
Consider the final restoration during preparation

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