オブチュレーションガッター^®とNTコンデンサーによる根尖孔封鎖性に関する研究

抄録

Abstract : In 1993, the new automated thermatic condensation technique with Multi-phase gutta-percha and NT (material as nickel-titanium) condenser on a contra angle electric engine was introduced by McSpadden. This technique enable to seal root canal obturation of even complex root canal quickly.

 But, a cost of Multi-phase gutta-percha is expensive, so Multi-phase gutta-percha was not popularized. There, we thought of a utilization of a cheap Obturation gutta with NT condenser for root canal filling.

 The purpose of this study was compare the sealing ability of Obturation gutta by NT condenser ( : Obturation technique) with lateral condensation technique, Multi-phase gutta-percha by NT condenser ( : Multi-phase technique), main gutta-percha point and Obturation gutta by NT condenser ( : Hybrid technique).

 The root canals of seventy-seven extracted mandibular incisors were endodontically prepared and obtrurated by the four techniques and immersed in the India ink. The penetration distance of the dye was measured from apex of the root.

 The results were as follows :

 1. The penetration distance of dye on obturated root canals were observed with order of Hybrid technique, Obturation technique, Multi-phase technique, lateral condensation technique. However, at a penetration distance, there were not difference among result of Mann-Whitney U-test, each.

 2. At Obturation technique and Multi-phase technique, it was 57.9% that there were not penetration of dye from apex of the root. Hybrid technique was 47.4%, lateral condensation technique was 45.0%.

 3. Obturation technique and Multi-phase technique were judged, as there were capability for apical seal by two-way analysis (test for the proportion). But, the lateral condensation technique occurred question against a capability.

 4. By the test of the curve of life (generalized Wilcoxon test) used to assess the effect of treatment, there was no difference between Obturation technique and Multi-phase technique. And then, lateral condensation technique was slightly inferior from the formers.

 Finally, the automated thermatic condensation technique depend on Obturation gutta and NT condenser proved to be effective in sealing the apical foramen.