Cavity preparation basics: Internal and External wall terminology and Ideal cavity form

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                         TOOTH PREPARATION:

  • Mechanical alteration of defective and injured tooth disease such that placement of restoration re-establish normal form and function ,aesthetics.

OBJECTIVES:

  1. Conserve
  2. Remove defect 
  3. Masticatory force
  4. Aesthetics

CONVENTIONAL PREPARATION:

  • Require wall form 
  • Uniform depth 
  • Margin

example: Amalgam, cast metal





CONSERVATIVE PREPARATION:

  • Remove defect : Example composite ,glass ionomer cement 

POLYCRYSTALLIC MATERIAL ;

  • Limited ability to flex 
  • Removal of defect 
  • Uniform depth

Example: Amalgam, glass ceramic 

POLYMERIC:

  • Greater ability to flex 
  • Removal of defective tooth

Example: Composite resin 






NOMENCLATURE:

TERMINOLOGY

One surface: Simple

Two surface: Compound

Three surface: Complex






ABBREVATION:

OCCLUSAL: O

MESIAL AND OCCLUSAL : MO

MESIAL,DISTAL AND OCCLUSAL :MOD

TOOTH PREPARATION WALL:

INTERNAL: Does not extend to external tooth 

AXIAL: Internal wall parallel to long axis

PULPAL WALL: Internal wall perpendicular to long axis

EXTERNAL WALL: Prepared surface to external tooth 

FLOOR: Reasonable horizontal and perpendicular to occlusal force that is directed parallel to long axis of tooth 

ENAMEL WALL: Portion of prepared external wall consisting enamel 

DENTINAL WALL: portion of prepared external wall consisting dentin 







ANGLE:

Rounded

LINE ANGLE: Two planar surface, different orientation along line

POINT ANGLE : Three planar surface ,different orientation 

CAVOSURFACE MARGIN : Angle formed by tooth structure of prepared wall and external surface of tooth.






To learn more about terminologies used in the field of conservative dentistry link on the link below TERMINOLOGY IN CONSERVATIVE

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