치아 미백 효과의 장기화를 위한 Resin Infiltration의 활용
Utilization of Resin Infiltration for Prolonging of Tooth Whitening Effects
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최근 들어 치아 미백술이 대중화되고 있으나, 단기간내 색소 재침착 등 고유의 한계점이 극복되지는 못 하고 있는 실정이라 할 수 있다. 본 연구는 치아 미백 효과의 색조 안정성을 향상시킬 방법의 하나로서, resin infiltration의 활용 타당성을 평가할 목적으로 시도되었다. 건전한 총 40개 우치 전치 순면으로부터 법랑질 시편을 채취, 제작하여 1차 착색 및 미백술을 시행하였다. 21일 경과후 시편을 무작위로 3개 군으로 나누어, resin infiltration군(RI군) 과 레진 접착제군(RA군)에 각 15개씩, 그리고 나머지 10개를 대조군으로 하였다. 마지막으로 전체 시편에 대하여 2차 착색을 시행하였다. 전 연구과정에서 색조 평가는 최초상태, 착색 직후, 미백제 적용후, 각 재료 적용후 및 2차 착색 후의 총 5회를 시행하였으며, spectrophotometer를 이용하여 측정하고 CIE L*a*b* 색조계로 기록하였다. 모든 군이 착색 후 L* 값은 감소, a*, b* 값은 증가하였으며, RI군과 RI군 모두 재료 적용 전후의 유의한 색조변화는 없었다(p 〉0.05). 1차 착색 전후의 색조변화량은 RI군, RA군 및 대조군에서 각각, 12.16 ± 3.50, 12.16 ± 3.38, 15.81 ± 6.39 였던 반면, 2차 착색 전후의 변화량은 각각 15.21±7.19, 15.93±4.31, 그리고 26.62 ± 17.89 로 나타났다. 2차 착색 후의 색조변화량은 RI군과 대조군간에 유의한 차이를 보였다. 또한, 1, 2 차 착색 전후의 각 군내 색조변화량 비교에 있어서는, RA 군과 대조군에 있어서는 유의한 차이를 보였으나(p < 0.05), RI군에서는 차이가 존재하지 않았다(p = 0.26). 이상의 결과로 보아, 재착색에 민감한 미백후의 치아에 대하여 레진 접착제의 적용으로는 미흡하며, resin infiltration을 통하여 색조 안정성을 향상시킬 수 있음을 확인할 수 있었다.
Abstract
The present study aimed to evaluate the validity of resin infiltration in improving color stability after tooth whitening. Enamel samples were extracted from 40 healthy bovine upper incisors, and primary staining and whitening were performed. After that, specimens were randomly divided into 3 groups : resin infiltration group(n = 15, RI group), resin adhesive group(n = 15, RA group), and control group (n = 10). Secondary staining was performed on all samples. Coloration was assessed 5 times as follows: initial color, immediately after staining, after whitening, after resin application, and after secondary staining. Color was measured using a spectrophotometer and recorded by using the CIE L*a*b* color space. The color changes after primary staining for the RI, RA, and control groups were 12.16 ± 3.50, 12.16 ± 3.38, and 15.81 ± 6.39, whereas those after secondary staining were 15.21 ± 7.19, 15.93 ± 4.31, and 26.62 ± 17.89. Color changes after secondary staining showed a significant difference between the RI and control groups. In the within-group comparison between primary and secondary staining, there was no significant difference found in the RI group only (p = 0.26). The results suggest that Color stability after tooth whitening can be improved using resin infiltration.
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