Introduction to Class I Composite Cavity Preparation Principles and Techniques 낱말 카드

What is the primary reason teeth require restorative intervention?

Carious lesions have progressed to the point that they require a restoration.

What are some reasons teeth may need restorative treatment?

Congenital malformation, improper positioning, previous restoration failure, recurrent decay.

What are the anatomical factors to consider before tooth preparation?

Enamel rod orientation, dentin thickness, pulp location, extent of previous restoration.

What procedural factors influence tooth preparation?

Operator skill, instrument design, type of rotary cutting instrument, ability to isolate.

What patient factors should be considered in tooth preparation?

Desires, caries risk status, age, cooperation.

What are the lesion/defect factors to consider before tooth preparation?

Bone support, occlusion, severity, gingival condition, pulpal condition, risk of fractures.

What are the restorative material factors to consider?

Physical properties, color characteristics, cost effectiveness.

What is an external wall in cavity preparation?

A wall that extends to the outer tooth surface.

Can an internal wall touch the cavosurface margin?

No, an internal wall does not extend to the outer tooth surface.

What is the isthmus in a cavity preparation?

The narrowest portion of a cavity preparation.

What are the classifications of cavity preparations?

Simple (one surface), compound (two to three surfaces), complex (four or more surfaces).

What is the initial depth and outline form in cavity preparation?

Establishing the initial depth and extending walls until reaching sound dentin-enamel junction.

What should be the access direction to a carious lesion?

The opening must be conservative and follow the orientation of enamel rods.

What is the minimum depth required in dentin during cavity preparation?

A minimum of 0.5 mm into dentin is required.

What is primary resistance form in cavity preparation?

Shaping of walls to withstand masticatory forces and resist fracture.

What is the minimum thickness of restorative material to prevent fracture?

Minimum thickness of 1.5 mm is required to withstand forces.

What should be done with unsupported enamel during cavity preparation?

All unsupported enamel must be removed.

What is the role of the pulpal floor in primary resistance form?

It should be flat and provide adequate depth for material thickness.

What defines the outline form of a cavity preparation?

The shape and perimeter of the cavity preparation in width, length, and depth.

What is the significance of the cavosurface margin?

It is the junction between the external walls of the cavity preparation and the uncut tooth surface.

What is the primary resistance form in tooth preparation?

It is the design that prevents tooth or restoration fracture from occlusal forces along the long axis.

What are the characteristics of primary resistance form?

Well-defined rounded internal line and point angles; sharp line angles are not recommended.

What is the difference in edge strength between amalgam and composite materials?

Amalgam has low edge strength, while composite has moderate edge strength with prime and bond.

What is the purpose of primary retention form?

It prevents displacement or removal of the restoration by tipping or lifting forces.

What is mechanical retention in tooth preparation?

It is the retention provided by the physical shape of the restoration, used by all restorative materials.

What is chemical retention in tooth preparation?

It is the bonding that composite materials rely on, heavily using prime and bond.

What is convenience form in tooth preparation?

It is the shape that allows for observation, preparation, and restoration of the tooth.

What is the significance of removing defective restorative material?

It is crucial for ensuring the integrity of the tooth structure and preventing infection.

What materials are used for pulp protection?

Liners like calcium hydroxide, zinc oxide, resin-modified glass ionomer (RMGI), and bases like zinc oxide-eugenol.

What is the role of sealer/desensitizer in tooth preparation?

It occludes dentinal tubules to reduce sensitivity, commonly using GLUMA.

What are secondary retention forms?

Additional features like pins, bevels, retention grooves, and slots that help avoid dislodgement.

Why is external wall finishing important?

To remove irregularities and unsupported enamel rods, ensuring the best marginal sealing possible.

What should be the maximum width of the isthmus area in cavity preparation?

The isthmus B-L dimension should not exceed 1/3 of the intercuspal distance.

What is the ideal final pulpal floor depth in cavity preparation?

The final pulpal floor depth should be between 1.5 mm and 1.75 mm.

What is the purpose of the 330 bur in cavity preparation?

It is used for initial access and removal of carious lesions and unsupported enamel.

What is the significance of the outline refinement in cavity preparation?

It ensures the outline is centered and the isthmus areas are appropriately sized.

What is the conservative approach to cavity outline?

The cavity outline should extend around the cusps with flowing curves around triangular ridges.

What should be done if the cavity outline is too wide?

Avoid widening the outline excessively; isthmus areas should be 1-1.2 mm.

What is the ideal depth for a punch cut when starting an outline?

The depth of the cut should be 1.3 mm, slightly short of the bur head.

What is the final step in finishing the cavity preparation?

Ensure the pulpal floor is flat and smooth, and the cavosurface margin is free of unsupported enamel.

What should be the approach if two cavities are present?

They should not be united unless the separating ridge is less than 0.5 mm.

What is the role of the 956 bur in cavity preparation?

It is used to flatten the pulpal floor during the finishing process.

What is the importance of conservation of tooth structure?

To preserve as much healthy tooth structure as possible while removing defects.

What is the purpose of bevels in secondary retention forms?

Bevels help enhance the retention of the restoration by increasing surface area.

What is the ideal approach to cavity preparation dimensions?

The dimensions should be ruled by the successful removal of carious tissue and unsupported enamel.