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황대석(Dae-Seok Hwang) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.11
Surgery first approach in orthognathic surgery is to proceed the orthognathic surgery without preoperative orthodontic treatment. This approach has many advantages, which include a shorter total treatment period, a high level of patient satisfaction due to immediate post-surgical facial improvement, easy postoperative orthodontic treatment due to early normalization of skeletal muscle, and the rapid tooth movement reflecting the regional accelerated phenomenon. However instability due to transient occlusal interference after surgery make worse of long-term skeletal stability. Especially increasing of vertical occlusion caused by interference of interbicupid and molar happen postsurgical skeletal change. Until now, there is no common consensus about treatment protocol of surgery first approach in orthognathic surgery. The purpose of this paper is to introduce our treatment protocol of the surgery first approach and to evaluate indication and limitation with case analysis.
황대석(Dae-seok Hwang),도의송(Ui-song Do),이영우(Young-Woo Lee) 한국정보기술학회 2003 Proceedings of KIIT Conference Vol.2003 No.-
본 논문에서는 분광 연구와 광섬유 증폭 시스템 및 remote sensing과 의학분야와 LIDAR 등에서 적용 할 수 있는 Cr:Mg₂SiO₄를 이용한 레이저 광원의 출력 특성을 알아보았다. 이를 위해 l064㎚ Nd:YAG레이저로 여기된 Cr:Mg₂SiO₄ 레이저의 발진 실험을 행하였으며, 레이저 출력 펄스폭 15㎱ 레이저 출력 1nJ인 1310㎚ 파장의 레이저 펄스를 얻었다.
III급 부정교합에서 선수술 교정치료를 통한 양악 수술 후 안정성
황대석,김용일,이재열,이성탁,김태훈,이주민,안경용,Hwang, Dae-Seok,Kim, Yong-Il,Lee, Jae-Yeol,Lee, Seong-Tak,Kim, Tae-Hoon,Lee, Joo-Min,Ahn, Kyung-Yong 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.5
Purpose: The purpose of the present study was to evaluate the postoperative skeletal stability of two-jaw surgery (Le Fort I osteotomy and bilateral sagittal split ramus osteotomy) via surgery first orthodontic treatment (SFOT) in class III malocclusion. Methods: Thirty-two patients who had two-jaw surgery via SFOT were included in this study. Serial lateral cephalograms were obtained before (T0), immediately after (T1), and six months after (T2) surgery. Twelve variables were measured for horizontal and vertical skeletal stability as well as for dental change. All measurements were evaluated statistically by a paired t-test ($P$ <0.05). Results: The mean skeletal changes were $0.1{\pm}2.5$ mm at point A and $-12.0{\pm}7.4$ mm at the pogonion. The mean horizontal relapse was 11.6% at the pogonion, and the mean vertical surgical changes included an upward displacement of $2.1{\pm}7.1$ mm and a forward displacement of $1.4{\pm}4.6$ mm at the pogonion. Upper incisor inclination decreased after surgery and was maintained at T2, and lower incisors were proclined from T1 to T2 by postsurgical orthodontic treatment. Conclusion: Postoperative skeletal stability of two-jaw surgery via surgery first orthodontic treatment in class III malocclusion was clinically acceptable.
하우헌,황대석,김용덕,신상훈,김욱규,김종렬,정인교,Ha, Woo-Hun,Hwang, Dae-Seok,Kim, Yong-Deok,Shin, Sang-Hun,Kim, Uk-Kyu,Kim, Jong-Ryoul,Chung, In-Kyo 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.2
The ameloblastoma is a common odontogenic tumor of the jaw bone and represents approximately 1% of tumor in the jaw. However, it might be able to infiltrate into the adjacent tissue, causing bony destruction and high recurrent rate. In this study, expression of RANKL and OPG in ameloblastoma in relation to age and gender of patient and recurrence, location of the lesion were examined through immunohistochemisry study. The RANKL and OPG antibody staining were used. The obtained result were as follow. 1. Positive immunoreactivity to RANKL/OPG in all specimens was found. 2. 1n recurrenc, location of ameloblastoma and age, gender of patients using immunohistochemical expression of RANKL. There was not significant difference. 3. 1n recurrence, location of ameloblastoma and age, gender of patients using immunohistochemical expression of OPG. There was not significant difference. In summary, it is suggested that activation of osteoclasts by RANKL is an important mechanism by which ameloblastomas cause bone destruction.
차성복,황대석,이영우,Cha, Seong-Bok,Hwang, Dae-Seok,Lee, Young-Woo 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.11
본 연구에서는 키보드나 마우스와 같은 기존의 입력 방식이 아닌 CdS센서 배열을 이용하여 비접촉 방식의 입력방식을 제안하였다. 여기에 측정 하고자 하는 위치에 빛을 조사하였다. 이 때 CdS 센서에서 측정된 값을 A/D 변환하였고 주변 CdS 센서와의 비를 구해 좌표 값을 획득하였다. 획득된 좌표값은 RS-232통신으로 PC에 전송하여 LabVIEW를 이용해 모니 터 화면에 나타내었다. 구현된 장치를 이용하여 측정한 결과로 CdS 센서간 거리를 100등 분 했을 때 위치 값을 정확히 표시함을 확인할 수 있었다. This study presented the non-contact human interface using by CdS sensor array. We are pointing the light on the target to measure the value. We converted the CdS sensors value to digital value and applied the digital value to set the coordinate value from the ratio of it to the adjacent sensors. The indicated coordinate-value is presented on the PC screen by LabVIEW The experimental result, we could confirm the right value divided between each sensor distance into In parts.
김종렬,황대석,Kim, Jong-Ryoul,Hwang, Dae-Seok 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.5
The columella, nasal tip, lip relationship in the secondary bilateral cleft deformity remains an enigma and a great challenge for the cleft surgeon. A subset of patients with bilateral cleft lip still require columellar lengthening and nasal correction, despite the advances in preoperative orthopedics and primary nasal corrections. An approach to correct this deformity is described. This consists of 1) lengthening the columella, 2) open rhinoplasty, allowing definitive repositioning of lower lateral cartilages, ear cartilage grafting to the tip and columella when necessary, 3) nasal mucosal advancement, 4) alar base narrowing and 5) reconstruction of the orbicularis oris as required. In surgical repair of the cleft lip nose, the timing of the operation(during lip closure, before or after the puberty growth sput), and the operative technique play a key role in the final result. In this study, 13 cleft lip patients who had undergone a secondary cheilorhinoplasty at the Department of Oral and Maxillofacial Surgery, Pusan National University Hospital were evaluated to check the proper time and method of the operation.
김욱규,차승만,황대석,김용덕,신상훈,김종렬,정인교,Kim, Uk-Kyu,Cha, Seong-Man,Hwang, Dae-Seok,Kim, Yong-Deok,Shin, Sang-Hun,Kim, Jong-Ryoul,Chung, In-Kyo 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.3
The challenging task of classifying the fibro-osseous(FO) lesions has been previously attempted but only in the past 15 years has the entire spectrum of diversity been appreciated. For the clinicians, it is hard to clearly diagnose the lesions before operations. The purpose of this study was to review the literature about fibro-osseous lesions of the jaws and to analyse our clinical cases. As the results of the review of clinical features, radiography and histopathologic findings of sixteen cases of fibro-osseous lesions, we could elucidate diagnostic aids for treatment of benign FO lesion in jaws. Six patients involving fibrous dysplasia complained the facial swelling and facial asymmetry. The radiographic features of the lesions showed ground-glass radiopacity mostly and the histologic findings showed typically Chinese character-shaped trabeculae without osteoblastic rimming in the fibrous stroma. Six patients with ossifying fibroma were notified as swollen buccal cheek state. Their radiographic findings showed cortical expanded radiolucent lesion with sclerotic defined border, which was contrast to the normal adjacent bone. The lesions showed variant radiolucent lesions. Histological findings were revealed as cellular fibrous stroma with woven bones, variable patterns of calcifications. Three patients with cemental dysplasia didn't have specific complaints. Well circumscribed radiopaque lesions on mandibular molar area were observed. Cementum-like ossicles with fibrous stroma were found on microscopic findings. A osteoblastoma case with jaw pain was found. The radiographic feature was a mottled, dense radiopacity with osteolytic border on mandibular molar area. Under microscopy trabecule of osteoid with vascular network were predominantly found. Numerous osteoblast cells with woven bone were found. These clinical, radiographic and microscopic findings of benign fibrous-osseous lesions would suggest diagnostic criteria for each entity of FO lesions.
구강 결손부에 적용된 요골 유리전완 피부피판 적용례 분석
김욱규,이광호,송원욱,황대석,김용덕,신상훈,김종렬,정인교,Kim, Uk-Kyu,Lee, Kwang-Ho,Song, Won-Wook,Hwang, Dae-Seok,Kim, Yong-Deok,Shin, Sang-Hun,Kim, Jong-Ryoul,Chung, In-Kyo 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.4
The radial forearm free flap (RFFF) has become a workhorse flap as a means of reconstructing surgical defects in the head and neck region. We have transferred 12 RFFFs with fasciocutaneous type on oral cavity defects in 12 patients after cancer resection and submucous fibrotic lesion ablation from 2005 to 2007 at Department of oral and maxillofacial surgery, Pusan National University Hospital. We reviewed retrospectively patients' charts and followed up the patients. Clinical analysis on the cases with RFFFs focusing on flap morbidity, indications and available vessels was done. The results of study are follows: 1. RFFF could be applied for all kind of defects after resection of tongue, floor of mouth, buccal mucosa, denuded bone of palate, maxilla, and mandible. 2. All free flaps could be used for primary reconstruction. The survival rate of 12 RFFFs was 92%. Partial marginal loss of the flaps was shown as 3 cases among 12 cases. Large size-vessels like superior thyroid artery, facial artery, internal jugular vein were favorable for microvascular anastomosis. 3. Parenteral nutrition instead of nasal L-tube also can be favorable for postoperative a week for better healing of the flap if the patients couldn't be tolerable with nasal tubing. 4. Donor sites with thigh skin graft were repaired with wrist band for 2 weeks. The complications included scarring, abnormal sensation on hand, and reduced grip strength in few patients, but those didn't induce major side effects. 5. Most RFFFs were well healed even if mortality rate of cancer patients was shown as 50% (5/10 persons). The mortality of patients was not correlated with morbidity of the flaps. We could identify the usefulness of RFFF for restoration of oral function, esthetics if the flap design, tissue transfer indications, and well controlled operation are proceeded.
치성각화낭종에서 receptor activator nuclear $factor-{\kappa}B$ ligand(RANKL)와 osteoprotegrin(OPG) 발현에 관한 연구
안동길,하우헌,김성식,황대석,김용덕,신상훈,김욱규,김종렬,정인교,Ahn, Dong-Kil,Ha, Woo-Hun,Kim, Seong-Sik,Hwang, Dae-Seok,Kim, Yong-Deok,Shin, Sang-Hun,Kim, Uk-Kyu,Kim, Jong-Ryoul,Chung, In-Kyo 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1
The odontogenic keratocyst(OKC) is a common developmental odontogenic cyst and represents approximately 11% of odontogenic cysts. It is decided by microscopic and histopathologic determinant rather than by clinical appearance. In this study, expression of RANKL and OPG in OKC in relation to age and gender of patient and recurrence, location of lesion were examined through immuno- histochemical study. The RANKL and OPG antibody staining were used. The obtained result were as follow. 1. Positive immunoreactivity to RANKL/OPG in all specimens was found. 2. There was no significant difference in immunohistochemical expression of RANKL relating to recurrence, location of OKCs and age, gender of patients. 3. There was no significant difference in immunohistochemical expression of OPG relating to recurrence, location of OKCs and age, gender of patients. From above results, it is suggested that activation of osteoclasts by RANKL is an important mechanism by which OKCs cause bone destruction.