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MTA를 이용한 직접치수캐핑법과 치수절단법 후 형성된 수복상아질의 조직학적 연구
박슬희(Seul-Hee Park),황호길(Ho-Keel Hwang),김흥중(Heung-Joong Kim),박주철(Joo-Cheol Park) 대한해부학회 2006 Anatomy & Cell Biology Vol.39 No.3
손상된 상아질은 수복상아질을 형성하는 과정에 의하여 치유되지만 치수캐핑법이나 치수절단법 후 형성되는 수복상아질에 대한 연구는 미미하다. 본 연구에서는 MTA를 이용한 직접치수캐핑법과 치수절단법에 의하여 형성된 수복상아질을 형태학적 방법 및 DSP와 BSP의 항체를 이용한 면역조직학적 방법으로 연구하여 다음과 같은 결과를 얻었다. MTA를 이용한 치수캐핑법 시행군과 치수절단법 시행군에서 술 후 2주의 소견에서 치수 손상부에 연속적인 수복상아질다리가 형성되었다. 치수캐핑법 시행군의 상아질다리를 형성하는 세포들은 전형적인 상아모세포의 소견을 보였으나, 치수절단법 시행군의 세포들은 세포의 형태가 둥글고, 모여 있거나, 소강에 함입되어 전체적으로 뼈모세포와 유사한 소견을 보였다. 치수캐핑법 시행군의 수복상아질다리 위쪽은 석회화된 물질 사이사이에 세포 소강이 관찰되었으나, 아래쪽에서는 세관의 구조와 석회화되지 않고 유기기질만 분포한 풋상아질이 관찰되어 전형적인 상아질의 특징을 보였다. 그러나 치수절단법 시행군에서는 전체적으로 뼈모양상아질 형태의 수복상아질이 관찰 되었다. 시술 후 4주 소견에서 치수캐핑법 시행군의 수복상아질다리를 형성한 세포들에서는 DSP 단백질이 강하게 발현되었으나 치수절단법 시행군에서는 수복상아질다리의 내부의 소강과 주위에 존재하는 세포들에서는 BSP단백질이 강하게 발현되었다. 위의 연구 결과는 치수가 자극의 정도와 상아모세포의 손상정도에 따라 다양한 특성의 수복상아질을 형성하여 치아를 보호함을 시사한다. The ultimate goal of a regenerative pulp treatment strategy is to reconstitute normal tissue continuum at the pulp-dentin border, regulating tissue-specific processes of reparative dentinogenesis. However, little is known about the molecular mechanism of reparative dentinogenesis. The purpose of this study was to investigate the pulpal response after direct pulp capping and pulpotomy with mineral trioxide aggregate (MTA) by histological and immunohistochemical studies. There was continuous reparative dentin bridge formation at 2 weeks after treatment with MTA in both the pulp capping and the pulpotomy groups. The cells in the pulp capping group showed typical odontoblast characteristics, while the cells of reparative dentin in pulpotomy group were round in shape, lost their polarity, organized as a sheet of cells, and trapped in osteodentin-like mineralized tissue. In pulp capping group, upper layer of the reparative dentin showed cell lacunae indicating osteoblastic characteristics, whereas lower layer of the reparative dentin contained predentin and dentinal tubule-like structures as normal dentin. However, there was osteodentin formation in pulpotomy group. DSP protein was expressed at 4 weeks in odontoblasts of pulp capping group, while BSP was expressed at 4 weeks after pulpotomy. These results suggest that two different types of reparative dentin formation, dentin-like and bone-like dentin, may depend on the type and extent of the injury and the effect of the associated defense reaction on the structural and functional integrity at the dentin-pulp border.
DNA probe Pn25를 이용한 Prevotella intermedia 및 Prevotella nigrescens의 동정
김화숙 ( Hwa Sook Kim ),김미광 ( Mi Kwang Kim ),유소영 ( So Young Yoo ),최민호 ( Min Ho Choi ),임상수 ( Sang Soo Lim ),박헌동 ( Heon Dong Park ),송수근 ( Soo Keun Song ),신환선 ( Hwan Seon Shin ),박슬희 ( Seul Hee Park ),임선아 ( 조선대학교 구강생물학연구소 2003 口腔生物學硏究 Vol.27 No.2
박슬희,노봉환,황호길 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.6
The aim of this study was to compare the initial apical file (IAF) length between the mesio-buccanl and mesio-lingual canals of the mandibular molar before and after early coronal flaring. Fifty mandibular molars with complete apical formation and patent foramens were selected. After establishing the initial working length of the buccal and lingual canal of the mesial root using the Root-ZX, radiographs were taken for the working length with a 0.5 ㎜ short of #15 K-file tip just visible at the foramen under a surgical microscope (OPMI 1-FC, Carl Zeiss Co. Germany) at 25X. After early coronal flaring using the K³ file, additional radiographs were taken using the same procedure. The root canal morphology and the difference in working length between the buccal and lingual canals were evaluated. These results show that the difference in the length between the mesio-buccal and mesio-lingual canals of the mandibular molar was ≤ 0.5 ㎜. If one canal has a correct working length for the mesial root of the mandibular molar, it can be used effectively for measuring the working length of another canal when the files are superimposed or loosening. In addition, the measured the working length after early coronal flaring is much more reasonable because the difference in the length between the mesio-buccal and mesio-lingual canals can be reduced.
중합효소연쇄반응법을 이용한 급성 치수 및 치근단 질환의 병원성 세균의 동정
김지훈,유소영,임선아,국중기,임상수,박슬희,황호길 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.2
The purpose of this study was to investigate the frequency of 7 putative pathogens in endodontic infections. The specimens were collected from infected pulpal tissue of patients who were referred for root canal treatment to the department of conservative dentisty, Chosun University. Samples were collected aseptically using a barbed broach and a paper point. The cut barbed broaches and paper points were transferred to an eppendorf tube containing 500 ml of 1 X PBS. DNAs were extracted from the samples by direct DNA extraction method using lysis buffer (0.5% EDTA, 1% Triton X-100). Identification of 7 putative pathogens was performed by PCR based on 16S rDNA. The target species were as follows: Porphyromonas endodontalis, Porphyromonas gingivalis, Prevotella intermedia, Prevotella nigrescens, Bacteroides forsythus, Actinobacillus actinomycetemcomitans, and Treponema denticola. Our data revealed that the prevalence of P.endodontalis was found in 88.6% (39 / 54), P.gingivalis 52.3% (23 / 44), P.nigrescens 18.2%(8 / 44), P.intermedia 15.9% (7 / 44), B.forsythus 18.2% (8 / 44), A.actinomycetemcomitans 2.3% (1 / 44), T.denticola 25% (11 / 44) of the samples. The high prevalence of P. endodontalis and P.gingivalis suggests that they may play an important role in the etiology of endodontic infections.