INITIAL STEPS OF
CAVITY
PREPARATION
PRANJALA MATHUR
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Steps of cavity prep., Schemes and Mind Maps of Endodontics
The primary retention form and convenience form in cavity preparation for amalgam restorations of different classes. It explains the importance of occlusal convergence and enamel margins in retaining the materials in the tooth. It also covers the features of convenience form, including the extension of walls and refinement of line and point angles. useful for dental students and professionals who want to learn about cavity preparation for amalgam restorations.
Typology: Schemes and Mind Maps
2021/2022
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INITIAL STEPS OF
CAVITY
PREPARATION
PRANJALA MATHUR
AGENDAAGENDA
3. Primary Retention Form
4. Convenience Form
Presentation title 2
PRINCIPLEPRINCIPLE
- (^) Retention needs are related to the restorative material used, the
principles of primary retention form vary depending on the material.
AMALGAM RESTORATIONS CLASS I
AND ALL CLASS II
AMALGAM RESTORATIONS CLASS I
AND ALL CLASS II
- (^) OCCLUSAL CONVERGENCE:
- (^) Materials is retained in the tooth by developing external tooth wall that converge occlusally
- (^) Cavosurface angle = 90 degree
- (^) In this way, when the amalgam is placed in the preparation and hardens, it cannot be dislodged without some type of fracture occurring.
- (^) This convergence should not be overdone for fear of leaving unsupported enamel rods on the cavosurface margin of the occlusal surface 5
CAST METAL RESTORATIONCAST METAL RESTORATION
- (^) Preparing diverging walls that are almost parallel to each other.
- (^) Divergence = 2-5 degrees per wall.
OTHER FEATURESOTHER FEATURES
- (^). In many respects, retention form and resistance form are accomplished in the same cutting procedure.
- (^) the same prepared form may contribute to the resistance and the retention qualities of the preparation.
- (^) 1. Dovetails
- (^) 2. Flat pulpal floor
- (^) 3. Dentine undercuts( near pulpal wall)
- (^) 4. Enamel bevel
FEATURES OF CONVENIENCE
FORM
FEATURES OF CONVENIENCE
FORM
- (^) Extension of distal, mesial, facial, or lingual walls to gain adequate access to the deeper portion of the preparation (1/4th^ the intercuspal distance).
- (^) These are prepared by deepening, or making more acute, one or more point angles of the preparation
- (^) Proper refinement of the line and point angles of Class I and V preparations is sufficient
- (^) The occlusal divergence of vertical (longitudinal) walls of tooth preparations for Class II cast restorations also may be considered as convenience form
- (^) Extending proximal preparations beyond proximal contacts.