군 치과 CAD/CAM 시스템으로 제작한 보철물의 변연적합도 평가 : In vivo study

홍용신 ( Yong-shin Hong ),정건석 ( Gun-suk Jung ),이일구 ( Il-gu Lee ),홍진선 ( Jin-son Hong ) 국군의무사령부 2016 대한군진의학학술지 Vol.47 No.1

Objectives : The purpose of this study is to evaluate effectiveness of ROK dental CAD/CAM(computer-aid design/computer-aid manufacture) system, which is newly introduced since 2015 by measuring marginal fitness of all ceramic final prostheses(zirconia crown) in labial(buccal), palatal(lingual), mesial and distal marginal area on molar and premolar teeth. Methods : twenty patients who need caries removal and prosthetic treatment participated in this study to fabricate crown prostheses by using ROK dental CAD/CAM system. total twenty-four teeth(seven maxillary premolar, six maxillary and mandibular molar, five mandibular premolar) are treated to CAD/CAM prostheses. final prostheses is adapted to teeth, and marginal fitness was evaluated by using replica technique. Results : labial/buccal marginal gap of bucco-lingual section is 57.1μm(±11.8μm), palatap/lingual is 64.9μm(±17.3μm), and mesial marginal gap of mesio-distal section is 61.9μm(±9.6μm), distal area is 62.5μm(±13.8μm). In comparison of tooth area, the marginal gap of maxillary premolar, mandibular premolar, maxillary molar, mandibular molar is respectively 54.9μm, 63.9μm, 64.0μm, 64.8μm. In periodic check after 1 month, non specific finding is seen such as periodontal or prosthetic problem. Conclusions : In this study, mean marginal distance of zirconia crown prostheses by using ROK dental CAD/CAM system is 61.6μm, so it seems that it had clinically acceptable marginal fitness.

군 치과 고정성 보철물의 재제작 및 실패 요인 분석 : 지르코니아 기반 완전도재전장관에 한해서

홍용신 ( Yong-shin Hong ),신경호 ( Kyung-ho Shin Jung ) 국군의무사령부 2016 대한군진의학학술지 Vol.47 No.1

Objectives : The aim of this study is to analyze about cause of remake and failure of zirconia-based all ceramic crown and to discuss to reduce possible error while prosthetic process both in clinic and in laboratory. Methods : This study is performed from Oct 2015 to Aug 2016 (about ten months). All remake cases are classified according to cause of failure ; marginal problem(open or overhanging margin), improper proximal contact(loosening or tightening), tooth shade problem, posterior occlusal unanatomical morphology, anterior labio-lingual shape, posterior occlusal fracture, endodontic treatment caused by post-cementation hypersensitivity or pulpal necrosis, anterior porcelain fracture of margin or incisal area over zirconia coping. Results : Among all prosthetic treatment by zirconia crown by using CAD/CAM system, total twelve cases needed remake because of failure of final setting. marginal problem is reported by four cases, esthetic problem of shape of prostheses in anterior area is reported by three cases, posterior occlusal surface fracture and contact problem in posterior area is reported by two cases inspectively, endodontic treatment caused by pulpal damage after cementation of zirconia crown is reported by one case. Conclusions : In this study, most cause of remaking and failure of prostheses was marginal problem of zirconia-based all ceramic crown prostheses. In order to reduce possible problem of fabrication of zirconia prostheses, close communication and cooperation between dentist and dental technician is need

헬기 조종사의 임무수행에 지장을 주지 않는 형태의 맞춤형 구강보호장치 제작에 관한 연구

홍용신 ( Yong-shin Hong ),강인석 ( In-suk Kang ),이일구 ( Il-gu Lee ),김민혁 ( Min-hyuk Kim ),김일형 ( Il-hyung Kim ) 국군의무사령부 2016 대한군진의학학술지 Vol.47 No.1

Objective : The purpose of this study is to fabricate custom-made mouthguard for helicopter pilots who need to protect oral and maxillofacial system(teeth, periodontal tissue, muscle of head and neck, and temporomandibular joint) from external damage such as bruxism and clenching not to disturb to perform their task. Methods : seventeen helicopter pilots who had bruxism or clenching habit, or severe teeth attrition, teeth fracture, and temporomandibular disorder participated in this study. At first, four type custom-made mouthguard(1mm, 2mm, 3mm, 4mm thickness) were constructed by soft material by using vaccum machine. And then, each mouthguard was adapted for one week respectively. Finally, participant were asked to fill out a questionnaire with a five point rating scale regarding the wearability. Results : All items showed significantly greater satisfaction level in 1mm mouthguard. Except for the 'occlusion' item, there is significantly lowest satisfaction level in 4mm mouthguard. In comparison to 2mm and 3mm mouthguard, no significant difference is seen in all items. Among all items, 'occlusion' item showed highest, and 'speaking' showed lowest satisfaction level. Conclusions : Despite of limitation of this study, 3mm thickness mouthguard which is minimum thickness to do it's own function is considered not to disturb to perform helicopter pilots's task.

시대별 장애아동 관련 신물 보도 경향에 관한 연구

홍용신 ( Yong Shin Hong ),천희영 ( Hui Young Chun ) 대한가정학회 2005 Human Ecology Research(HER) Vol.43 No.5

전자 서베잉을 이용한 서베이드 금관과 국소의치 프레임워크 디자인

홍용신,박은진,김성균,곽재영,허성주,박지만,Hong, Yong-Shin,Park, Eun-Jin,Kim, Seong-Kyun,Koak, Jai-Young,Heo, Seong-Joo,Park, Ji-Man 대한치과보철학회 2011 대한치과보철학회지 Vol.49 No.4

There are still many limitations on fabricating dentures using digital method while computerized production of fixed prostheses utilizing intraoral scanner and CAD/CAM technology has propagated rapidly. Recently the digital solution of fabricating removable partial denture by applying haptic input device, electronic surveying, and rapid prototyping was introduced. In this case presentation, five patients were treated with surveyed crown and removable partial dentures by this digital solution. Fit of dentures was excellent except for one case which showed morphological difference between the actual teeth and that of master cast by the erroneous impression process. There also was not any problem of stability and retention after adaptation in the clinical setting. 구강 스캐너와 CAD/CAM 기술로 인해 컴퓨터로 제작하는 방식이 활발히 보급된 고정식 보철 증례와는 달리, 의치를 디지털 방식으로 제작하는 데에는 아직 한계가 많다. 촉각을 느낄 수 있는 입력 장비와 전자 서베잉의 개념, 그리고 쾌속 조형법의 적용으로 인해 국소의치를 디지털로 제작할 수 있는 솔루션이 최근 소개되고 있다. 본 증례보고에서는 이러한 국소의치의 디지털 솔루션을 이용하여 총 다섯 명의 환자에서 서베이드 금관 및 국소의치를 제작하였다. 인상 과정상의 문제로 모형과 실제 치아 사이의 형태적 차이가 있었던 경우를 제외하고는 국소의치의 적합도는 우수했으며, 장착 후 안정성과 착탈 시의 유지력 또한 임상에서 적용하는 데에 문제가 없었다.

구강 내 디지털 인상채득을 통한 맞춤형 지대주와 시멘트 합착 후 나사형 임플란트 보철 수복 증례

홍용신,박은진,김선종,김명래,허성주,박지만 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.1

최근 디지털 인상채득 시스템이 개발되면서 이를 기존의 CAD/CAM 시스템과 접목한 인레이, 온레이, 크라운이나 간단한 계속가공의치 등의 고정성 보철물의 제작이 활발히 소개되고 있다. 그러나 임플란트 보철에서는 주로 기존의 아날로그식 인상채득 후 이를 스캔하여 제작하는 방법이 사용되어 왔으나, 구강 내 디지털 스캔한 데이터를 이용하여 나사형 보철물을 제작하는 술식은 아직 활발히 이루어지지 않았다. 이에 본 증례보고에서는 6명의 환자를 대상으로 구강 내 스캐너인 iTero를 사용하여 디지털 스캔을 시행한 후 그중 다섯명은 맞춤형 지대주와 시멘트 합착 후 나사형 임플란트 보철물(screw-retained implant prosthesis after cementation, or SCRP)을 제작하였고, 임상적으로 기능과 심미적인 측면으로 만족할 만한 결과를 얻었기에 이를 보고하고자 한다. Fixed dental prostheses such as inlay, onlay, crown, and bridge fabricated by CAD/CAM technique combined with digital impressions is getting popular due to the recent rapid progress of digital impression taking system. For the scope of implant prosthesis, however, digital intra-oral scan hasn’t been actively utilized for the fabrication of superstructures. In this case report, 6 cases of titanium-milled custom abutment based on the iTero intra-oral scan data were introduced, five of them were restored with screw-type prosthesis after cementation (SCRP) and the clinical results were satisfactory on restoring the function and esthetics.

전자 서베잉을 이용한 서베이드 금관과 국소의치 프레임워크 디자인

홍용신,박은진,김성균,곽재영,허성주,박지만 大韓齒科保存學會 2011 Restorative Dentistry & Endodontics Vol.36 No.6

구강 스캐너와 CAD/CAM 기술로 인해 컴퓨터로 제작하는 방식이 활발히 보급된 고정식 보철 증례와는 달리, 의치를 디지털 방식으로 제작하는 데에는 아직 한계가 많다. 촉각을 느낄 수 있는 입력 장비와 전자 서베잉의 개념, 그리고 쾌속 조형법의 적용으로 인해 국소의치를 디지털로 제작할 수 있는 솔루션이 최근 소개되고 있다. 본 증례보고에서는 이러한 국소의치의 디지털 솔루션을 이용하여 총 다섯 명의 환자에서 서베이드 금관 및 국소의치를 제작하였다. 인상 과정상의 문제로 모형과 실제 치아 사이의 형태적 차이가 있었던 경우를 제외하고는 국소의치의 적합도는 우수했으며, 장착 후 안정성과 착탈 시의 유지력 또한 임상에서 적용하는 데에 문제가 없었다. There are still many limitations on fabricating dentures using digital method while computerized production of fixed prostheses utilizing intraoral scanner and CAD/CAM technology has propagated rapidly. Recently the digital solution of fabricating removable partial denture by applying haptic input device, electronic surveying, and rapid prototyping was introduced. In this case presentation, five patients were treated with surveyed crown and removable partial dentures by this digital solution. Fit of dentures was excellent except for one case which showed morphological difference between the actual teeth and that of master cast by the erroneous impression process. There also was not any problem of stability and retention after adaptation in the clinical setting.