Proximal cavities of 25 deciduous posterior molars and 25 immature permanent posterior molars, each with C2, were restored with the use of GRAFT LC II and a clinical observation was made.
The results were as follows:
1. Both deciduous posterior molars and immature permanent posterior molars showed steps at the margin as early as one week after restoration. No abnormality in marginal adaptation one year after was seen in 23 cases (92.0%) in each group.
2. One year after, morphological changes were seen in one case each in the deciduous posterior molars and immature permanent posterior molars. The immature permanent posterior molar especially showed changes in the whole tooth.
3. Staining and discoloration were seen from one week after restoration in both deciduous posterior molars and immature permanent posterior molars. No abnormality was seen one year after in 23 cases (92.0%).
4. Marginal discoloration was seen from one week after restoration. Discoloration was not seen in 23 cases (92.0%) one year after.
5. Secondary caries were seen from three months after restoration. No abnormality was seen one year after in 23 cases (92.0%).
6. Pulp reaction at the restoration was seen in one case each in both the deciduous posterior molars and immature permanent posterior molars, but pulpal procedure was not required.
7. At the time of recall, pulpal procedure for retreatment was required for one case in the deciduous posterior molars and immature permanent posterior molars.
On the basis of the foregoing findings, it is suggested that light cured composite resin is effective for restoration of Class II cavities in deciduous posterior molars and immature permanent posterior molars.