[영문]The purpose of this study is to investigate the differences of root formation by using differnt three materials histopathologically.
11 beagle dogs about 6 months old and 11.2 Kg by mean weight were used for root canal filling, a total of 94 root canals from 54 mandibular premolars with immature roots. Pulp tissues were extirpated and root canals were left open for 2 weeks before debrldement, and filled with Ca(OH)2-CMCP paste for control group and vitapex A.S.R.(Apatite Root Sealer type Ⅱ)for experimental groups. the teeth were then observed for the healing of periapical tissues, tapes of epical closure and hard tissue formation at 30, 70, 180 days after the treatment histopathologically.
The results were a8 follows :
1. In flnal evaluation, It revealed 70% as good, 20% as fair and 10% as poor In control group, 74% as good, 20% as fair and 6% as poor in Vitapex group, and 36% as good, 45% as fair and 19% as poor in A.S.R. group.
2. In the status of apical closure, 80% of the control group, 91% of the Vitapex group and 13% of the A.R.S. group were observed for Complete and incomplete spical closure.
3. Of the 5 typeg of apical closure, cloaure at apical foramen type was most common (mean 52%) In all groups. And extracanal closure types were more common In control group compaired with experimental grouts. Root growth types were not observed.
4. In X-ray evaluations , proper canal filling cased were more evaluated as good and fair , and poor cases were not observed In experimental groups.
In the treatment of immature permanent teeth with infected root canals. Vitapex produced better results than Ca(7H)2-C77P paste. Cases evaluated as poor for A.R.S. were more common and so moer longer period observation is needed.