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RISS 인기검색어
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- 저자 : 장진화 ( Jang Jin Wha ) (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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콘크리트 미관창출과 열화저감을 위한 3D프린팅 폼라이너 디자인 연구
장중식 ( Jang Jungsik ),황가영 ( Hwang Ga Yeong ),윤문구 ( Youn Mun Ku ),장진화 ( Jang Jin Wha ),천수경 ( Cheon Soo Gyeong ) 디자인융복합학회 2017 디자인융복합연구 Vol.16 No.1
현대에 들어서 건축물의 외관 디자인에 대한 관심이 커짐에 따라 기존의 획일화된 건축물이 아닌 다양한 미관의 건축물에 대한 니즈가 증가하고 있다. 그러나 아직까지 미관창출을 위한 국내의 폼 라이너 재료 및 디자인은 한정되어 있는 실정이다. 따라서 본 연구는 3D프린터를 활용하여 기존의 값비싼 몰드 제작과정을 생략하고 디지털 데이터를 이용하여 입체구조의 제품을 다양한 소재를 사용하여 경제적으로 제작, 콘크리트의 열화방지 수단을 겸비하고 구조물의 수명을 연장시켜 생애주기비용을 절감하는 효과를 기대할 수 있다. 본 연구는 3D 프린터를 활용하여 콘크리트 구조물의 위치, 주변 환경, 용도에 적합한 폼 라이너의 미관 및 입체조형 디자인을 다양하게 개발하는 것을 목적으로 한다. 본 연구에서는 3D 프린트를 활용한 실물 출력 실험을 통해 3D프린터를 활용한 콘크리트 폼 라이너가 실제 적용이 가능하다는 가능성을 확인하였으며, 콘크리트 구조물의 용도, 지역특성, 주변 환경, 사용자 등을 고려하여 입체적이며 예술적인 조형미관을 위한 폼 라이너 디자인을 제안하였다. Interest in the exterior design of buildings has increased in recent years. Demand for various architectural structures is increasing. However, domestic form liner and design are still limited. Thus, this research uses 3D printers to omit the existing mold production process. Use digital data to produce products economically using various materials. It can be hoped that extending the lifespan of the concrete structure will reduce the cost of saving costs. The purpose of this study is to utilize the 3D printers to develop the design of a suitable formative shape for the purposes of the concrete. In this study, 3D printed form enables the possibility that the actual application is practical. Consideration for the artistic design of the art line was proposed for the purpose of considering the use of concrete structures for concrete structures.
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