The purpose of this study was to examine the closure of root canal at the apex by using 2 % fuchsin dye solution after application of retrofilling materials. Retrofilling was done with gutta-percha point, gutta-percha point by Amagasa's method, composite resin, and amalgam. As control, teeth undergoing apicoectomy teeth were filled with orthograde guttea-percha. We compared and investigated the results obtained with each material.
The conclusions were as follows:
(1) Amagasa's method showed the best blockage as well as good treatment results.
(2) The results indicated that sealer was indispensable for good blockage by retrofilling with gutta-percha point.
(3) Composite resin is expected to be a promising material after establishment of its biocompatibility as a retrofilling material, because it showed good blockage comparable to Amagasa's method and requires a simple operative procedure.
(4) The results mentioned above showed that in cases undergoing apicoectomy with orthograde gutta-percha filling Amagasa's method or retrofilling of composite resin should be concrrently performed to ensure complete blockage of the root apex.
