Abstract
The purpose of this study was to evaluate clinically low viscosity composite resin used as class II restorations in primary molars. The subjects of the present study were 61 children aged 2 to 10 years who visited the Pedodontic Clinic of Tohoku University Dental Hospital. A total of 153 class II cavities were treated with Clearfil SC-II (Kuraray). The observation period varied from 6 to 74months after the treatment. The restorations were examined with regard to spacing or stepped abrasion in the marginal region of the fillings, fracture, loss, attrition and discoloration and recurrent caries and/or pulpal involvement of the treated teeth.
The following findings were obtained:
1) 101 cases (66.0%) were evaluated as clinically acceptable. About 80% of those treated primary molars exfoliated and were replaced by permanent teeth.
2) 52 cases (34.0%) exhibited poor restorative conditions. Of those cases,31(20.3%) were treated again,4 (2.6%) are being observed periodically as follow up cases, and in 17 cases (11.1 %) the primary molar exfoliated phisiologically or was extracted when the succeeding permanent tooth appeared.
3) The incidences of poor restorative conditions among children who were treated at the ages of three and four years were higher than among children treated at the ages of greater than six years.
4) There was a tendency for poor restorative conditions to occur comparatively soon after treatment.
5) Among the poor restorative conditions, recurrent caries and stepped abrasion in the marginal region of the restorations occurred more frequently.
6) Those conditions were observed most in cases involving upper first primary molar restorations.
