- Temporization if much tooth tissue has been removed.
The casting is constructed in the laboratory, and the fit surface is sand blasted.
Visit 2.
- Local analgesia.
- Rubber dam.
- Tooth is brushed with pumice, washed, and dried.
- Casting is tried in to check marginal adaptation and fit.
- Casting is re-sandblasted to obtain optimum conditions for bonding.
- Tooth is etched, washed, and dried.
- Cement is applied to fit surface of casting ensuring there are no bubbles.
- The casting is held in position under pressure for 3 min.
- Excess cement is removed.
- Oxygen inhibiting material (oxyguard) is applied over the margins of the casting
and maintained in position for a further 3 min. - The oxyguard is removed by washing; margins rechecked; and occlusion checked.
508H
Fig. 9.47 An etched coping covering the
occlusal surface of a hypoplastic molar.9.12 ALTERNATIVES TO CONVENTIONAL CAVITY PREPARATION
9.12.1 Air abrasion
There has recently been a resurgence of interest in air abrasion technology with
several different commercial units available. With air abrasion machines, aluminium