Abstract
The purpose of this study was to investigate the cavity form for the conposite resin in the deciduous molars.
The materials were 57 buccolingually continuous nondcacicified ground specimens which were made from 15 lower second deciduous molars with composite resin restoration, having shown good progress up to the exchange of the successive permanent teeth.
The relationship between the cavity floor and the enamel-dentin junction was was examined and the distance from the cavity to the pulp chamber was measured.
The results were as follows:
1. The cases in which the cavity floor was in the enamel came to 5 of 15 teeth (33%). This ratio was smaller in comparison with that of the upper second deciduous molars (75%).
2. The obervation area in which the cavity floor was frequently in the enamel was in the center of the tooth (40.0%).
3. The minimum distance from the cavity to the pulp chamber was 1.12∼27mm at the mesio-buccal and lingual horn of the pulp chamber. The maximum distances were 2.11∼2.17 mm at the central fossa. The distance from the cavity to the pulp chamber was 1.12∼2.17 mm in all of the cavities.
4. The distance from the cavity to the pulp chamber tended to be shorter at the mesial and distal sides than at the center sides.
