표백방법에 따른 변색된 무수치의 색조 변화에 관한 연구
A study on the color changes of discolored nonvital teeth by the nonvital bleaching techniques
박현희, 조영곤,
소속 상세정보
박현희 ( Park Hyun-Hee ) - 조선대학교 치과대학 보존학교실
조영곤 ( Cho Young-Gon ) - 조선대학교 치과대학 치과보존학교실
KMID : 0353319930170020417
Abstract
The purpose of this study was to compare and evaluate the bleaching efficacy of three nonvital bleaching techniques: Walking bleaching, Walking bleaching and heat application, and Walking bleaching and bleaching light application.
36 extracted anterior teeth with intact crowns were immersed in 5% sodium hypochlorite solution for twenty-four hours to loosen extrinsic debris. Lingual access openings were prepared in all teeth and the pulps were extirpated. The teeth were
stored in
5% sodium hypochlorite for twenty-four hours to open the dentinal tubules and they were stained via whole blood. Once the teeth were stained, they were evaluated with Colorimeter.
The teeth in each group were ranked from lightest to darkest and divided equally into three experimental group in which the following bleaching techniques were used. Intracoronal base was placed 2mm below cementoenamel junction.
Group 1:Walking bleaching (Superoxol+Sodium perborate)
Group 2:Heat application+Walking bleaching (Superoxol+Sodium perborate)
Group 3: Light application+Walking bleaching (Superoxol+Sodium perborate)
The bleaching agents were changed every 3 days and the teeth were bleached for a total of 14 days. The teeth were evaluated with Colorimeter before the start of any bleaching and on day 14.
@ES The results were as follows:
@EN 1. At the end of 14 days, all the sample teeth demonstrated the increase of Lightness
Index at cervical 1/3 of crown (p<0.05) Lightness Index was significant difference in group 2 and 3, but there were some minor differences among groups (p>0.05).
2. In all groups, there was significant difference in red chromacity (p<0.05). but there were some minor differences among groups (p.0.05).
3. In all groups, there was no significant difference in yellow chromacity (p>0.05).
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