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RISS 인기검색어
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- 저자 : Jin-Wha Chung(장진화) (검색결과 2 건)
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상$\cdot$하악 대구치 부위에 식립된 임플란트의 생존율에 대한 후향적 연구
장진화,류경호,정현주,Jang, Jin-Wha,Ryoo, Gyeong-Ho,Chung, Hyun-Ju 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.2
Dental Implants have been proved to be successful prosthetic modality in edentulous patients for 10 years. However, there are few reports on the survival of implant according to location in molar regions. The purpose of this study was to evaluate the $4{\sim}5$ years' cumulative survival rate and the cause of failure of dental implants in different locations for maxillary and mandibular molars. Among the implants placed in molar regions in Gwangju Mir Dental Hospital from Jan. 2001 to Jun. 2002, 473 implants from 166 patients(age range; $26{\sim}75$) were followed and evaluated retrospectively for the causes of failure. We included 417 implants in 126 periodontally compromised patients, 56 implants in 40 periodontal healthy patients, and 205 maxillary and 268 mandibular molar implants. Implant survival rates by various subject factors, surgical factors, fixture factors, and prosthetic factors at each location were compared using Chi-square test and Kaplan-Meier cumulative survival analysis was done for follow-up(FU) periods. The overall failure rate at 5 years was 1O.2%(subject level) and 5.5%(implant level). The overall survival rates of implants during the FU periods were 94.5% with 91.3% in maxillary first molar, 91.1% in maxillary second molar, 99.2% in mandibular first molar and 94,8% in mandibular second molar regions. The survival rates differed significantly between both jaws and among different implant locations(p<0.05), whereas the survival rates of functionally loaded implants were similar in different locations. The survival rates were not different according to gender, age, previous periodontal status, surgery stage, bone graft type, or the prosthetic type. The overall survival rate was low in dental implant of too wide diameter(${\geq}5.75$ mm) and the survival rate was significantly lower for wider implant diameter(p<O.01) in mandibular second molar region, Among 5 surface types(acid etched, SLA, TPS, REM, and HA), the survival rate of SLA type implant was the highest during the FU periods and the failure rates of HA type implants was significantly high following functional loading. Among 26 failed implants, 20 resulted in early failure of osseointegration or infection prior to functional loading, and 6 were removed because of progressive bone loss or implant fracture. In conclusion, implant survival rates were different in different locations on the posterior jaws, and the fixture diameter and surface type were the significant factor for implant survival in mandibular 2nd molar region. This observation suggests that implant treatment planning might require region-specific manner.
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Osteonecrosis of the Femoral Head Associated with Butane Gas Inhalation
Soon-Yong Kwon(권순용),Jin-Wha Chung(장진화),Ki-Won Kim(김기원),Young-Kyun Woo(우영균),Sung-Woo Huh(하성우),Yong-Sik Kim(김용식) 대한정형외과학회 2005 대한정형외과학회지 Vol.40 No.8
저자들은 부탄가스 흡입으로 인해 조직 소견상 대퇴골두의 심한 울혈을 보이는 괴사증 2예를 보고하였으며, 이에 그 병인을 밝히기 위하여 본 동물실험을 계획하였다. 특별히 고안된 상자를 통해 15마리의 토끼에 대하여 8주간 부탄가스를 흡입 시켰으며, 혈액학적 검사 및 대퇴골두의 조직학적 검사를 시행하였고, 그 결과를 대조군과 비교하였다. 혈액학적 검사에서 혈중 콜레스테롤과 triglyceride의 증가를 보였으며, 대퇴골두에 대한 조직학적 검사에서 골내혈관들의 심한 울혈과 함께, 혈관벽 기저막의 손상을 관찰할 수 있었다. 그러므로, 부탄가스 흡입은 대퇴골두의 무혈성 괴사에 대한 하나의 새로운 원인 인자로 생각되어 질 수 있을 것이다. We have reported two clinical cases of osteonecrosis of the femoral head caused by butane gas inhalation with the characteristic findings of severe congestion of the intraosseous vessels, and we would like to illustrate the pathologic mechanism in an animal study. Butane gas was administered to fifteen rabbits using a specially designed box. Blood chemistry including triglycerides and lipoprotein electrophoresis were performed. The changes in the of blood vessels and marrow of the proximal femur were subject to histopathologic study. The levels of triglyceride and total cholesterol were increased after butane gas inhalation. Disruption of the basement membrane of veins with thrombosis and thrombus of the small to medium sized vessels were observed in and around femoral head. Severe congestion of intraosseous blood vessels was also observed within the femoral head of the rabbits. In conclusion, butane gas inhalation should be considered as a new etiology for the development of osteonecrosis of the femoral head.
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