염화수화물용액 침지법으로 제작한 유색 지르코니아와 전장도재의 전단결합강도

윤귀덕,유수경,방몽숙,양홍서,김현승,박상원,Yun, Kwi-Dug,Ryu, Su-Kyoung,Vang, Mong-Sook,Yang, Hong-So,Kim, Hyun-Seung,Park, Sang-Won 대한치과보철학회 2010 대한치과보철학회지 Vol.48 No.2

Purpose: The purposes of this study was to evaluates shear bond strength between zirconia core and veneer-ceramic in order to examine the clinical practice of colored zirconia block fabricated by infiltration method into the metal chloride solution. Material and methods: CNU block and $Everest{(R)}$ ZS blank were used. VITA In-$Ceram{(R)}$2000 YZ Coloring liquid (LL1) and 3 aqueous metal chloride solutions containing chromium and molybdenum ingredients were used. 40 zirconia specimens were prepared into cuboid shape ($5{\times}5{\times}10 mm$). All specimens were divided into 5 groups by infiltrating into the coloring liquids. After that, porcelain was build up into the shape of $5{\times}5{\times}4mm^3$, followed by sintering. The maximum loading and shear bond strength was measured. Failure patterns and failure sites were examined. Results: 1. There were no statistical differences in shear bond strength between zirconia blocks (P > .05). 2. There were no statistically significant differences in shear bond strength between non-colored and colored zirconia blocks, while shear bond strength of non-colored zirconia blocks is higher than that of colored specimen (P > .05). 3. In the comparison with shear bond strength among colored zirconia blocks, there were no statistical differences according to kinds of coloring liquid (P > .05). 4. Mixed failure patterns were mainly observed in the failure between zirconia and veneering ceramic. The veneering ceramic failure of all specimens was observed in either interface of zirconia or veneering ceramic. Conclusion: Shear bond strength between colored zirconia and veneering ceramic shows lower tendency than non-colored zirconia, but there was clinically allowable value.

구강 내 사진과 치아 모형 스캔을 이용한 교정 발치 패턴 예측에서의 인공지능 정확도

엄효정(Hyojung Eom), 이경민(Kyungmin C. Lee), 윤귀덕(Kwidug Yun), 이재서(Jae-Seo Lee), 국민석(Min-Seok Kook) 대한치과교정학회 2025 대한치과교정학회 임상저널 Vol.15 No.4

Introduction: This study aimed to evaluate the accuracy of an artificial intelligence model in predicting orthodontic extraction patterns using intraoral photographs and dental model scans. Methods: Orthodontic treatment plans and pre-treatment patient data, intra-oral (IO) images and 300 right-side digital scans of pre-treatment gypsum model casts, were collected from patients who had completed orthodontic treatment at the Department of Orthodontics. Data set consisted of 150 extraction cases and 150 non-extraction cases, divided into 85% training and 15% test set for AI models. Model performance was evaluated by accuracy, precision, recall, and F1 scores. Results: The AI model trained with IO images at level 2 showed 65.90% accuracy, 66.80% precision, 65.90% recall, and 66.30% F1 score. In addition, the AI model trained with the digital scans at level 1 showed 61.63% accuracy, 61.60% precision, 61.40% recall, and 61.50% F1 score. At level 2, the digital scan model showed 61.18% accuracy, 68.30% precision, 68.20% recall, and 68.20% F1 score. Moreover, the AI model trained with the digital scans at level 3 showed 43.18% accuracy, 41.80% precision, 43.20% recall, and 42.50% F1 score. Among the tested models, the AI model trained with the digital scan level 2 showed the highest scores. Conclusions: These findings indicate the potential utility of an artificial intelligence model in supporting extraction decision-making in orthodontic treatment based on intraoral photographs or digital model scans.

Fabrication of PLGA film modified with cell - derived matrix and their osteogenic potential with preosteoblasts

윤미림,김익환,박귀덕 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.4

치조제 흡수가 심한 무치악 환자에서 흡착원리를 이용한 총의치 수복 증례

김현아,윤귀덕,조유진,양홍서,박상원,박찬,Kim, Hyun-Ah,Yun, Kwi-Dug,Jo, Yu-Jin,Yang, Hongso,Park, Sang-Won,Park, Chan 대한치과보철학회 2020 대한치과보철학회지 Vol.58 No.2

Fabrication of complete denture with suction mechanism was introduced to enhance the retention and stability of denture by sealing around the denture border by forming negative pressure on the inner side of denture base during functional movement such as swallowing or masticating. Mandibular suction dentures reduce denture dislodging force during opening by taking preliminary impression without pressure on retromolar pad area in rest position. In this case, fabrication of complete denture using suction mechanism for an edentulous patient with severe alveolar bone resorption allowed us to clinically enhance retention and stability of denture and improve satisfaction of patient.

냉간 정수압 성형법으로 제작된 지르코니아 코어의 적합도에 관한 연구

서윤정,윤귀덕,김현승,박상원,Seo, Yoon-Jeong,Yun, Kwi-Dug,Kim, Hyun-Seung,Park, Sang-Won 대한치과보철학회 2010 대한치과보철학회지 Vol.48 No.2

Purpose: The purpose of this study is to fabricate the new zirconia block (CNU block) and to evaluate fit of core and porcelain veneered zirconia crown. Material and methods: The experimental blocks were fabricated from the commercial ytrria-stabilized zirconia powder (KZ-3YE Type A). The powder was uniaxial pressing and the green bodies were conducted using the Cold Isostatic Pressing. The zirconia blocks were presintered at $1040^{\circ}C$ and the final sintering was performed at $1450^{\circ}C$. The Kavo Everest ZS $blank{(R)}$ (KaVo, Biberach/ $Ri{\beta}$.) was used as a control group. The linear shrinkage of CNU block and Kavo block were compared. Twenty-one cores for porcelain veneered crowns were fabricated with CAD/CAM system ($Everest{(R)}$, Biberach/ $Ri{\beta}$.). Group I; seven cores fabricated from Kavo blocks, Group II; seven cores fabricated from CNU blocks, Group III; seven cores from CNU blocks and porcelain veneering for crowns. All specimens were cemented and sectioned into two planes; diagonal and bucco-lingual. The measurement of the marginal, internal, and occlusal fit was carried out using SEM ($S-4800^{(R)}$) at $30{\times}$. The results were analyzed by one-way ANOVA test. Results: The linear shrinkage of the CNU block and the KaVo block was 19.00% and 20.09%. The marginal gap of cores ($29.67{\pm}6.58{\mu}m$) fabricated from CNU blocks showed significantly smaller than that of the cores of Kavo blocks ($36.84{\pm}7.18{\mu}m$) (P < .05). The internal gaps of the porcelain veneered crowns ($32.23{\pm}6.33{\mu}m$) were larger than those of the other two groups ($37.57{\pm}6.81{\mu}m$ and $38.14{\pm}6.81{\mu}m$). Conclusion: No statistically significant difference was found in between experimental groups and control group. The experimental groups in marginal gap showed significantly smaller than the control group.

Rabbit calvaria를 이용하여 hyaluronic acid (HA)를 처리한 poly (D,L-lactic-co-glycolic acid) 차폐막들의 골 생성능력에 대한 비교 연구

김남숙,윤귀덕,방몽숙,양홍서,임현필,강성수,박상원,Kim, Nam-Sook,Yun, Kwi-Dug,Vang, Mong-Sook,Yang, Hong-So,Lim, Hyun-Phil,Kang, Sung-Soo,Park, Sang-Won 대한치과보철학회 2010 대한치과보철학회지 Vol.48 No.2

Purpose: The objective of the present study was to histologically evaluate durability and bone regeneration capacity of new synthetic membranes in comparison to clinically available collagen membrane. Material and methods: To the skulls of 12 rabbits, we created 4 bone defects of 6 mm in diameter on each of them. Each of defects were covered with at least one of 5 membranes; No membrane, Collagen ($Ossix^{TM}$), PLGA, HA-coated-PLGA and HA-PLGA/PLGA. After 4, 8, 12 weeks, we cut the skulls and dyed with H-E. And then, the histologic observation was done. Results: In current study, the control group which did not use the membrane showed bone regeneration at 12 weeks and covered the bone defect partially. New bones were formed through the underneath of endocranium, and the upper defect was filled with connective tissues and fats. Collagen membrane ($Ossix^{TM}$) showed new bones after 4 weeks, and they were formed through the membrane which maintained until 12 weeks. PLGA, HA-coated-PLGA, HA-PLGA/PLGA showed bone regeneration after 4 weeks and after 8 weeks, they mostly filled defects. At 12 weeks, we could find new bones and previous bones almost look alike and also, they united well. Membranes were unnoticeable after 4 weeks and were absorbed. Conclusion: Bone formation and maturation of PLGA, HA-coated-PLGA and HA-PLGA/PLGA were faster than the control group. They showed no difference on the application of HA and after 4 weeks, they were absorbed.

순측으로 식립된 상악 우측 측절치 임플란트의 즉시 수복 증례

공성지,송지은,윤귀덕,박찬,장우형 대한치과보철학회 2024 대한치과보철학회지 Vol.62 No.3

즉시 임플란트 식립과 수복은 치료 기간을 단축하고, 최종 수복 시까지 심미성을 유지할 수 있다는 장점이 있다. 하지만 상악 전치부에서의 단일 임플란트 수복은 심미적인 부분에서 어려움이 있을 수 있는데, 임플란트 식립 중 연조직과 경조직에 전달된 수술적 외상은 향후 심미적 결과에 영향을 미칠 수 있다. 이러한 전치부 임플란트 식립 및 수복 시 예측 가능한 결과를 얻기 위해서는 치간골의 높이, 치은의 특성, 환자 치아의 형태적 특성 등을 고려하여 수술 및 수복 계획을 세워야 한다. 본 증례에서는 경제적 문제로 PFM (Porcelain Fused-Metal) 수복을 원하는 환자의 계획보다 순측으로 식립된 상악 전치부 임플란트를 치은 형성과 디지털 인상을 통해 emergence profile 과 안정화된 연조직 형태를 재현하고자 했다. Immediate implant placement and restoration have the advantage of shortening the treatment period and maintaining aesthetics until final restoration. However, single implant restoration in the maxillary anterior region may be aesthetically difficult, and surgical trauma delivered to soft and hard tissues during implant placement may affect future aesthetic results. In order to obtain predictable results during anterior implant placement and restoration, surgery and restoration plans must consider the height of the interdental bone, characteristics of the gingiva, and morphological characteristics of the patient’s teeth. In this case, we attempted to reproduce the emergence profile and stabilized soft tissue through gingiva modification and digital impression of a labially placed maxillary anterior implant in a patient who desired porcelain fused-metal (PFM) restoration due to economic issues.

완전 무치악 환자에서 BPS를 이용한 흡착식 총의치 수복증례

김수헌,임현필,윤귀덕,박찬,장우형 대한치과보철학회 2024 대한치과보철학회지 Vol.62 No.4

BPS (Biofunctional Prosthetic System)는 Ivoclar Vivadent사가 개발한 의치 제작 시스템으로, 술자의 숙련도와 크게 관계없이 의치를 체계적으로 제작하는 것을 목표로 한다. Abe가 소개한 흡착 의치란 의치상연의 전체 주위를 가동성 점막으로 봉쇄함으로써 의치상 내면을 음압으로 하여 의치의 유지와 안정을 강화하는 개념으로, 흡착 의치 제작 시 BPS를 이용하는 것이 이상적이라고 하였다. 본 증례에서는 완전 무치악 환자에게 BPS를 이용하여 흡착식 총의치를 제작하여 우수한 의치 유지력과 환자의 만족도를 얻었다.

상악절제술로 인한 경구개 결손 환자에서의 closed hollow obturator 제작 증례

장우형,임현필,윤귀덕,박찬,양홍서,Jang, Woo-Hyung,Lim, Hyun-Pil,Yun, Kwi-Dug,Park, Chan,Yang, Hong-So 대한치과보철학회 2020 대한치과보철학회지 Vol.58 No.1

Maxillectomy is performed to remove the tumor in the palate, maxillary sinus, buccal mucosa or nasal cavity. The resection range depends on the size and the extent of the tumor and it affects speech production or cause nasal regurgitation during feeding. Obturator can occlude an opening such as an oro-nasal fistula and protect the defect area. Successful reconstrucion of the patient's oral cavity who have gone over the maxillectomy is a difficult task. The condition and number of teeth, the remaining support area, and the extent of the defect area have a great influence on manufacturing the obturator. If these factors are disadvantageous, the prognosis of the prosthesis is uncertain. The final obturator must have a sufficient retention in the patient's oral cavity and must not irritate the surrounding tissue and support area where the resection was performed.In this case, a 55 year old female went through the maxillectomy and the only 3 teeth remained. And the retention of the maxillary prosthesis seems to be poor. So that, we fabricated the closed hollow obturator which has reduced weight compared to the conventional obturator. Consequently the closed hollow obturator can give better sealing and the adaptation.

3D 프린팅을 이용한 양악 총의치 제작 증례

이은수,박찬,윤귀덕,임현필,박상원 대한치과보철학회 2022 대한치과보철학회지 Vol.60 No.2

최근 디지털 치의학의 발달로, Computer-aided design-Computer-aided manufacturing (CAD-CAM)을 이용한 의치 제작이 증가하는 추세이다. CAD 소프트웨어를 통해 디자인된 의치를 제작하는 방식에는 밀링을 이용한 절삭가공방식과 3D 프린팅과 같은 적층가공방식이 있으며, 적층가공방식은 보다 복잡한 구조를 재현하는데 유리하게 사용될 수 있다. 본 증례는 뇌경색으로 인해 신체적 장애를 갖게 된 상·하악 완전무치악 환자에서 제작 기간과 내원 간격을 단축하기 위해 광경화 Stereolithography (SLA) 기반의 3D 프린팅을 이용한 디지털 제작 방식의 양악 총의치 수복 증례이다. 최종인상채득을 위해 기존 임시의치를 디지털 방식으로 복제 및 출력하여 개인트레이로 활용하였고, 부가중합형 실리콘 인상재로 채득한 최종인상체에는 수직고경과 중심위, 상악 전치부의 각도 및 길이에 대한 정보가 포함되었다. 또한 임시의치를 장착하고 촬영한 안면 스캔 데이터를 추가로 획득하여 기공작업 시 교합평면 결정이나 인공치 배열에 참고할 수 있도록 하였다. 인상체를 3차원 스캔 후 CAD 프로그램을 통해 인공치를 배열하였고, 연마면을 형성하여 의치 디자인을 완성하였다. 시적 의치 및 최종 의치는 FDA 승인을 받은 액체 광경화성 레진을 이용하여 SLA 기반 3D 프린터로 출력하였고, 최종 의치는 적절한 안정과 유지, 지지를 보였으며, 기능적, 심미적으로 만족스러운 결과를 얻을 수 있었다. 최종 의치의 전달까지 3회의 내원 횟수를 필요로 하였으며, 기공시간의 단축으로 내원 간격을 줄임으로써 환자의 만족도를 증진시켰다.