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CEREC$^{(R)}$ AC system으로 채득된 디지털 인상의 재현성, 정확성 평가에 관한 연구
김재홍,김기백,김혜영,김정애,김웅철,김지환,Kim, Jae-Hong,Kim, Ki-Baek,Kim, Hae-Young,Kim, Jung-Ae,Kim, Woong-Chul,Kim, Ji-Hwan 대한치과기공학회 2012 대한치과기공학회지 Vol.34 No.2
Purpose: The aim of this study was to determine the reliability and accuracy of measurements in digital models(CEREC$^{(R)}$ AC) compared to stone models. Methods: A master model(500B-1, Nissin Dental Product, Japan) with the prepared upper full arch tooth was used. Conventional impression and then stone model(n=10) were produced from this master model, and on the other hands, digital impressions were made with the CEREC$^{(R)}$ AC intra-oral scanner(n=10). One examiner measured two times the intercanine, intermolar distance, dental arch length. The stone model were measured using a digital caliper. The t-student test for paired samples and intraclass correlation coefficient(ICC) were used for statistical analysis. Results: The measurement of two methods showed very good reliability. At the intra-examiner reliability of measurement, ICC at the stone and CEREC$^{(R)}$ AC model were 0.81 and 0.94. The mean difference between measurements made directly on the stone models and those made on the CEREC$^{(R)}$ AC model was 0.20~0.28mm, and was statistically significant(P=0.001). Conclusion: These in vitro studies show that accuracy of the digital impression is similar to that of the conventional impression. These results will have to be confirmed in further clinical studies.
디지털 인상 채득 시 흔히 발생하는 오류에 관한 연구 - CEREC$^{(R)}$ AC의 사례 중심으로 -
김재홍,김지환,김혜영,Kim, Jae-Hong,Kim, Ji-Hwan,Kim, Hae-Young 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.3
Purpose: The purpose of the study was a quantitative evaluation of common errors in digital impression procedure using CEREC$^{(R)}$ AC system. Methods: Two-hundreds digital impression data comprising 174 inlays, 26 onlays by CEREC$^{(R)}$ AC in-office CAD/CAM system were obtained from a dental clinic. One evaluator assessed errors of the digital impression data and divided into five categories of errors: inappropriate scanner positioning (ISP), improper handling with a scanner (IHS), irregular powder arrangement (IPA), improper cavity preparation (ICP), and insufficient scanned data (ISD). Results: The most common errors were IPA(21%), and ISP and ISD were followed by 17% respectively. IHS was found in 14.5% of all digital impression data. ICP comprising only 6.5% was the rarest. Conclusion: Most errors were due to inaccurate manipulation with an intraoral scanner or improper cavity preparation for scanning. A deliberate manipulation to prevent common errors mentioned may deliver an optimal result in the digital impression procedure.
김재홍,김정호,조성일,박상학,김상훈,추일한,김승곤,Kim, Jae Hong,Kim, Jung Ho,Cho, Sung Il,Park, Sang Hag,Kim, Sang Hoon,Choo, Il Han,Kim, Seung Gon 대한생물정신의학회 2015 생물정신의학 Vol.22 No.1
Objectives The purpose of this study was to examine the psychiatric characteristics of outpatients with tinnitus. Methods A total of 88 subjects were included in this study. According to Tinnitus Handicap Inventory (THI) scores, the subjects were classified into two group ; a mild tinnitus symptoms (mild-tinnitus) group and a severe tinnitus symptoms (severe-tinnitus) group. A questionnaire was used for an assessment of demographic characteristics, and the THI, the Visual Analogue Scale (VAS) about tinnitus, the Beck Depression Inventory (BDI), and the Beck Anxiety Inventory (BAI) are applied for evaluation of other clinical psychiatric characteristics. Results Higher THI scores were positively correlated with tinnitus course, the number of accompanying symptoms, and the VAS. BDI total scores, BDI factors, and BAI total scores were significantly higher in the severe-tinnitus group than in the mild-tinnitus group. Also suicidal ideation, interpersonal problems, sleep problems, occupational impairment, and fatigue were significantly higher in the severe-tinnitus group than in the mild-tinnitus group. Conclusions Tinnitus is a common disorder of hearing which is associated frequently with psychiatric problems. This study suggests that psychiatric interventions should be taken into consideration in the treatment of patients suffering from tinnitus.
ShadeEye$^{(R)}$ NCC system을 이용한 Vita CAD/CAM Ceramic Block의 크기에 따른 색조 일치성 비교연구
김재홍,김혜영,김웅철,김지환,Kim, Jae-Hong,Kim, Hae-Young,Kim, Woong-Chul,Kim, Ji-Hwan 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.3
Purpose: The purpose of this study was to compare color correspondence of different sizes of Vita Mark II$^{(R)}$ and TriLuxe$^{(R)}$ Feldspar blocks. Methods: The three commercially available shades(1M2, 2M2, 3M2) of Mark II & TriLuxe blocks for the CEREC$^{(R)}$ CAD/CAM system were examined. For each of three colors, three different sizes were tested, 5 blocks each. The measurements were made using a spectrophotometer equipped with an integrating sphere using the CIE $L^*$, $a^*$, $b^*$ colorimetric system. Results: The $L^*$, $a^*$, $b^*$ value of Vita Mark II$^{(R)}$ ceramic block showed significantly higher than TriLuxe$^{(R)}$ ceramic block(p<0.05). In comparing the Vita Mark II$^{(R)}$ specimen of the three different shade, color differences between materials(${\Delta}E^*$) showed the lowest value of 2.09, and the highest was 2.24. ${\Delta}E^*$ values of the materials of Vita Mark II$^{(R)}$ were higher than 2. As the size of ceramic block differed, the color correspondence of Vita Mark II$^{(R)}$ showed statistically significant difference but, this result is clinically acceptable. Conclusion: All the different sizes of the different shades of Vita TriLuxe$^{(R)}$ blocks for the CEREC$^{(R)}$ system showed the high degree of color correspondence necessary in industrially prefabricated CAD/CAM blocks. The results of the present study suggested that it would be necessary to establish the reproducible and constant color specification system for an esthetic restoration.
CEREC<sup>ⓡ</sup> system에서 사용하는 세라믹 소재로 가공된 CAD/CAM 전부도재관의 변연간격 비교분석
김재홍,김기백,김사학,Kim, Jae-Hong,Kim, Ki-Baek,Kim, Sa-Hak 대한치과기공학회 2016 대한치과기공학회지 Vol.38 No.3
Purpose: The purpose of this study is to evaluate the marginal gap of all-ceramic crowns fabricated by CEREC$^{(R)}$ in-office CAD/CAM system. Methods: The mandibular first molar was selected as the abutment for the experiments. Thirty working models were prepared. VITA Mark II(VM) and VITA Enamic(VE), LAVA Ultimate(LU) blocks were milled using CEREC MCXL with CEREC 3D system to construct 10 crowns for each groups. To measure marginal gap, milled restorations were examined under digital microscope with scale under 160x magnifications. The results were statistically analyzed using the one-way ANOVA and Tukey's HSD test(${\alpha}=0.05$). Results: There was no significant difference in the marginal gap regarding to ceramic materials(p>0.05). Conclusion: Single crowns fabricated using CEREC in-office CAD/CAM system provided clinically acceptable marginal gap. This confirmed that the type of ceramic material used does not determine the precision of fit of a prosthesis.
김재홍,Kim, Jae-Hong 한국단미사료협회 2004 사료산업 Vol.2 No.8
뉴캐슬병은 국제동물보건기구인 국제수역사무국(OIE)에서 고병원성 조류인플루엔자, 구제역, 돼지콜레라 등과 같이 세계적인 악성 가축전염병 (15종)인 A등급으로 분류하여 관리할 정도로 피해가 심각한 질병으로서 국가간의 축산물 교역과 방역에 이TDj 특별히 취급하도록 권장하고 있고, 예방접종을 하지 않은 계군에 감염되면 거의 100%의 폐사를 일으킬 정도로 무서운 닭의 전염병이다.(중략)
만성요통환자에 대한 Bee Venom과 Sweet Bee Venom의 치료효능 비교 연구
김재홍,장선희,윤현민,안창범,장경전,김철홍,송춘호,최하나,Kim, Jae-Hong,Jang, Sun-Hee,Yoon, Hyun-Min,Jang, Kyung-Jun,Ahn, Chang-Beohm,Kim, Cheol-Hong,Song, Choon-Ho,Choi, Han-Na 대한약침학회 2008 Journal of pharmacopuncture Vol.11 No.4
Objective The aim of this study is to investigate if Sweet Bee Venom(SBV) Therapy has the equal effect in comparison with Bee Venom (BV) Therapy on Chronic Lower Back Pain. Methods Clinical studies were conducted to 39 patients who were treated Chronic Lower Back Pain in Dept. of Acupuncture and Moxibustion, Dongeui University from March 1 to June 30, 2008. Subjects were randomly devided into 2 groups : BV treated group(Group A, n=19), SBV treated group(Group B, n=20) In BV treated group(Group A), we treated patients with dry needle acupuncture and BV Therapy. In SBV treated group(Group B), we treated patients with dry needle acupuncture and SBV Therapy. All process of treatment were performed by double blinding method. 1. To estimate the efficacy of venom in controlling pain, we have checked Visual Analog Scale(VAS). 2. For evaluating functional changes of patients, we have checked Oswestry Lower Back Disability Questionnaire(ODI). 3. To estimate Itching which is the most prominent symptom of allergic reaction, we have checked Visual Analog Scale(VAS). Results 1. In controlling pain, the results of BV treated group(Group A) is more effective than that of SBV treated group(Group B). 2. In promoting function, the results of BV treated group (Group A) is more effective than that of SBV treated group(Group B). 3. In controlling itching, the results of SBV treated group(Group B) is more effective than that of BV treated group(Group A). Conclusions According to the study, SBV Therapy shows more effective result than BV Therapy in controlling itching. But BV Therapy is more effective than SBV Therapy in controlling pain and promoting function.
김재홍,하영국,박천수,장민수,이미경,윤여훈,손주찬,Kim, J.H.,Ha, Y.G.,Park, C.S.,Jang, M.S.,Lee, M.K.,Yoon, Y.H.,Sohn, J.C. 한국전자통신연구원 2005 전자통신동향분석 Vol.20 No.2
로봇 지능은 다양하게 해석될 수 있으며 해석에 따라 다른 요소기술들을 포함하게 된다. 본 고에서는 '사용자의 명령과 주어진 상황을 이해하여 수행할 서비스 목표를 설정하고 이를 달성하기 위한 일련의 작업들을 계획'하는 데 필요한 지적 능력을 로봇 지능으로 정의한다. 이와 같은 로봇의 지능적 서비스 수행 능력을 실현하기 위한 기본적인 요소 기술에는 자연언어 기반의 인간-로봇 인터페이스, 컨텍스트 처리, 서비스 컴포지션 기술이 포함된다. 본 고에서는 이들 요소 기술의 현황과 로봇에의 응용 방향을 살펴본다