근관 삼출액에서의 기질금속단백분해효소-8과 substance P의 수준에 관한 연구
Matrix metalloproteinase-8 and substance P levels in root canal exudates of nonvital teeth
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연구목적: 근관 치료를 전후로 근관 삼출액을 추출하여 MMP-8과 SP의 양을 측정하고 근관 치료에 따른 변화 및 이들간이상관관계를 보는 것을 본 연구의 목적으로 하였다. 연구 재료 및 방법: 치수괴사, 혹은 이전 근관 치료 후 치근단 병소가 있어서 근관 치료가 예정된 35개의 치아를 대상으로 하였으며, 근관 치료 첫날, 2주 후, 4주 후 paper point를 이용하여 근관 삼출액을 채취하였다. MMP-8과 SP의 양은enzyme-linked immunosorbent assay (ELISA)를 이용하여 정량 하였다. 삼출액의 채취 시점에 따른 MMP-8, SP 양의변화 및 환자의 통증 정도, 임상증상에 따른 MMP-8, SP의 변화는 mixed model을 이용하여 통계 분석하였으며 MMP-8과SP의 상관관계는 Pearson correlation coefficient를 구하여 분석하였다(p < 0.05). 결과: 근관치료가 진행됨에 따라 MMP-8, SP의 양은 유의성 있게 감소하였으며(p < 0.0001), 환자의 통증이나 타진검사시 반응이 SP의 발현에 영향을 주는 것으로 나타났다. MMP-8의 경우 SP와 미약한 양의 상관관계가 있었지만 환자의 증상이나 다른 임상검사와 상관관계가 발견되지 않았다. 결론: 본 실험에서 사용된 paper point를 이용한 근관 삼출액의 채취를 통하여 치근단 염증과정에서 발현되는 MMP-8, SP 를 검출할 수 있었으며 특히 SP의 경우 환자의 증상과 보다 관련이 깊은 것으로 나타났다.
Abstract
Objectives: The aim of this study was to investigate levels of matrix metalloproteinase-8 (MMP-8) and substance P (SP) in root canal exudates during root canal treatment (RCT) of nonvital, painful teeth. Materials and Methods: Patients scheduled for nonsurgical RCT were prospectively selected; the study was performed after obtaining informed consent from the patients and was approved by the Institutional Review Board for Clinical Research of Gangnam Severance Hospital, Yonsei University (3-2008-0118). Canal exudates samples were collected using sterilized paper points from teeth scheduled for RCT across three different time periods. MMP-8 and SP levels were measured using enzyme-linked immunosorbent assay (ELISA). Data were analyzed using a mixed model analysis and the Pearson correlation analysis (p < 0.05). Results: MMP-8 and SP levels in GCF were decreased during RCT (p < 0.0001), and they showed a weak positive correlation to each other (p < 0.05). Patients’subjective pain levels and the response from percussion test were significantly related to SP level. Conclusions: This study demonstrated that periradicular inflammation endodontic origin can elevate SP and MMP-8 levels in root canal exudates. Interestingly, SP level of canal exudates showed a possibility of being used as an indicator of pain due to periapical pathosis. [J Kor Acad Cons Dent 2011;36(3):196-202.]
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