Definition: Convenience form is defined as that form of cavity preparation that allows adequate observation, accessibility and case of operation in preparing and restoring the cavity.
Modification in tooth preparation for convenience form:
- Occlusal step in classII.
- Labial/lingual access for classIII/classIV.
- Occlusal divergence of cavity walls in cast restorations.
- Contra angling
- Addition of angles to the shank of the instrument.
- Wedging of teeth.
SUPPORT OF ENAMEL RODS:
- All enamel walls should be supported by sound dentin.
CAVOSURFACE ANGLES FOR DIFFERENT RESTORATIVE MATERIALS
- Amalgam-90 degree cavosurface
- Inlay– beveled cavosurface (20-40 degrees)
- The margins should always should be always located on self-cleansing areas. They should be in smooth curves.
Low speed with tungsten carbide burs are preferred for finishing cavity walls and the margins, as there is lessening of tactile sense and rapid removal of tooth structure with high speed.
Partha Pratim Kalita says
Its nice to read your articles. Very useful and easy to understand. Keep it up. Try to add more standered informations regarding the topic.
Sure will try to do so, and please let me know which topics you would like me to write about more. Your feedback will be quite useful.