하악 전돌증으로 인한 악교정수술후의 안면 연조직 변화 예측을 위한 컴퓨터 프로그램

이충국(Choong Kook Yi),박영철(Young Chel Park) 대한구강악안면외과학회 1990 대한구강악안면외과학회지 Vol.16 No.3

The purpose of this study is to predict the change of the facial soft tissue following orthodontic surgery associated with mandibular prognathism. Twenty-one patients were selected who recieved orthognathic surgery in mandible only (13 cases) and in maxilla and mandible simultaneously (8 cases). Ages of the patients were over the 16.8 years. Lateral cephalometric head films were taken just before the operation and post operative film were used that of post-operative minimum 6 months. We evaluated the cases by two methods, 1:1 mean ratios and stepwise multiple regression analysis. The results were as follows. 1. The prediction is more accurate by stepwise multiple regression analysis than by 1:1 mean ratios. 2. The prediction by stepwise multiple regression equation is always available regardless the method of operation. 3. We can make a soft ware program for computerizing by obtaning the stepwise multiple regression equation.

안모비대칭의 진단 및 처치

이충국(Choong Kook Yi),장현호(Hyun Ho Chang),김희경(Hee Kyung Kim) 대한구강악안면외과학회 1991 대한구강악안면외과학회지 Vol.17 No.3

In some individuals, facial asymmetry appears conspicuously and it causes esthetic problem with other several symptoms. It has been long that the authors have introduced the classifications and diagnostic methods of facial asymmetry. In this report, we will introduce more developed diagnostic method in two viewpoints. First, in diagnosis of facial asymmetry, we added the concept of mandibular independent growth unit, and studied that which unit tends to cause the jaw deformity. Second, we present improved three-dimensional diagnostic method for systemize spatial problem. Several surgical cases which are applicated by this diagnostic method will be also presented. Such cases will show the necessity of treatment on the etiopathogenic area.

하악지 길이증가를 위한 수술방법들간의 회귀현상에 관한 실험적 연구

이충국(Choong Kook Yi),장현호(Hyun Ho Chang),박정현(Jung Hyun Park) 대한구강악안면외과학회 2000 대한구강악안면외과학회지 Vol.26 No.6

Facial asymmetry is the most frequent disease in craniofacial deformities. And the primary causing area of that is mostly placing in mandible. That is to say, it is known that primarily, mandible grows excessively or deficiently, and other facial region involving maxilla undergoes compensatory growth secondarily, so asymmetric face develops. In facial asymmetry, the surgical correction of undergrowth is more difficult than that of overgrowth and the reason of it is the postoperative relapse caused by stress of surrounding soft tissues. It means the stress of surrounding soft tissues occurring after bone lengthening and reducing above stress is the same meaning with reducing postoperative relapse. Among various areas, mandibular ramus is the most difficult area to lengthen vertically and maintain its length. The reason of it is considered by many authors as the stress of surrounding pterygomasseteric sling which is enveloping lower border of mandible and interrupting elongation of ramal height. So we applied two different surgical procedures in which pterygomasseteric slings have different stress respectively to monkeys which have similar masticatory function and anatomy to human being and compared relapse by radiographic film and observed periodically the histochemical change of masseteric muscle fiber. So we could see the following results. The relapse was less in EVRO group in which we separated pterygomasseric sling in inferior border and didn’t approximate muscle sling after vertical lengthening to minimize the stress of soft tissues than IVRO group in which we elongated ramal height preserving pterygomassetric sling. Of course, we could see a problem in EVRO group such as bone resorption in inferior border caused by uncovering the periosteum of inferior border. But we expect that such problem will be solved by developing periosteum substitutes for covering the exposed bone and minimizing the surgical trauma. In histochemical study of masseteric muscle fiber, the fiber constituents of EVRO group in which we minimized soft tissue stress was changed immediately after operation and maintained it for 1 year, whereas that of IVRO group in which we preserved soft tissue stress was changed in more portion after operation and recovered it by 1 year . By the histochemical results, we can see that the recovery of fiber constituents reflect the recovery of muscle stress and it is closely related with relapse phenomenon.

A study on the temporomandibular disorders in dentofacial deformity patients

이충국(Choong Kook Yi),박정현(Jung Hyun Park) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.4

악안면기형은 측두하악장애의 발생과 예후에 있어 중요한 기여인자 중의 하나이다. 최근에는 여러 학자들에 의해 교합평면의 변화가 악안면기형환자의 악기형수술을 통한 기능적, 심미적 개선에서 중요한 한 요인임이 보고되었다. 저자는 41명의 악안면기형환자를 대상으로 하여 측두하악장애의 발생율을 조사하고 교합평면 및 하악평면을 중심으로한 두개안면방사선사진 계측을 통해 악교정수술 전후의 측두하악장애의 변화양상을 관찰하고 그 상관관계를 조사하여 다음과 같은 결론을 얻었다. 1. 악안면기형환자의 측두하악장애의 발생율은 46%로 나타났고 악교정수술후 전체환자의 20%로 감소하였다. 2. 측두하악장애의 술전후의 변화양상과 악안면기형의 유형 및 전치부의 피개상태 사이에는 상관관계가 없었다. 3. 측두하악장애의 술전후의 변화양상과 교합평면 및 하악평면의 변화사이에는 상관관계가 높았다. 4. 악안면기형의 교정시에 적절한 저작계의 기능을 얻기 위해서 술후의 교합평면 및 하악평면을 각 개인의 이상적인 교합평면 및 하악평면과 평행하도록 설정하는 것이 바람직할 것으로 사료된다. Dentofacial deformities are important contributing factors in developments and prognosis of temporomandibular disorders. Nowadays, several authors have reported that alteration of occlusal plane is the important factor in functional and esthetic improement of orthognathic surgery of dentofacial defomty patients. The objects of this article are to investigate the incidence and the changes of the symptoms of the temporomandibular disorders through the orthognathic surgery of 41 dentofacial deformity patients and to suggest the interrelation between changes of temporomandibular disorder and occlusal plane and mandibular plane. The result s are as follows ; 1. The incidence of the temporomandibular disorder was 46% and it was decreased to 20% after orthognathic surgery. 2. There were no significant relationships between types of DFDs, types of anterior bite and changes of temporomandibular disorder symptoms. 3. There was a significant relationship between postoperative occlusal and mandibular planes and changes of temporomandibular disorder symptoms. 4. To obtain a optimal function of gnathologic system in correction of dentofacial deformities, it is proposed to achieve the parallelism of postoperative occlusal plane and mandibular plane to its individual ideal occlusal plane and mandibular plane.

DEEP BITE를 동반한 골격형 제Ⅱ급 부정교합의 치험례

이충국(Choong Kook Yi),차인호(In Ho Cha) 대한구강악안면외과학회 1991 대한구강악안면외과학회지 Vol.17 No.1

Skeletal Class Ⅱ malocclusion with deep bite is difficult to manage properly. Generally the lower facial height is short and the curve of Spee is severe. We managed these cases as fellowe. 1) Tooth alignment through the pre-op. orthodontic treatment. 2) Surgically mandibular advanced with modified wafer. 3) Using the modified wafer, by rapid extrusion of posterior teeth, Curve of Spee was decreased during IMF. The rapid extrusion process is begun the IMF periods, thereby decreasing total treatment time. Our two cases result were satisfactory by means of more simple surgical technique and orthodontic treatment.

치조골 파열 부위로부터의 치아 맹출 유도

이충국(Choong Kook Yi),박형래(Hyung -ae Park) 대한구강악안면외과학회 1991 대한구강악안면외과학회지 Vol.17 No.4

The choice of the optimal time for secondary bone-grafting must depend on the tooth eruption stage than the chronologic age. And the success of alveolar graft is affected by the grafting materials and the appropriate orthodontic treatment. This is a case report of 2 bilateral alveolar clefts and 1 unilateral alveolar cleft, which impacted tooth was erupted through the alveolar grafted area.

개교증을 야기한 관절염

이충국(Choong Kook Yi),최수원(Soo Won Choi),전주홍(Ju Hong Jeon) 대한구강악안면외과학회 1990 대한구강악안면외과학회지 Vol.18 No.4

There can be many causative factors for open bite, and arthritides on temporomandibular joint can be one of those. Arthritides on temporomandibular joint are classified as: infectious, traumatic, inflammatory, degenerative and metabolic. Authors have examined two patients, who came in with open bites as their a chief complanits, and have found bone resorptions of mandibular condyles. Various diagnostic methods have resulted in diagnosis of rheumatoid arthritis and degenerative arthritis for each patient, and appropriate treatment planning has been established.

Isolation and Differential Expression of an Acidic PR-1 cDNA Gene from Soybean Hypocotyls Infected with Phytophthora sojae f. sp. glycines

Choong Seo Kim,Seung Youn Yi,Yeon Kyung Lee,Byung Kook Hwang 한국식물병리학회 2000 Plant Pathology Journal Vol.16 No.1

Isolation and Differential Expression of an Acidic PR-1 cDNA Gene from Soybean Hypocotyls Infected with Phtophthora sojae f. sp. glycines

Kim, Choong-Seo,Yi, Seung-Youn,Lee, Yeon-Kyung,Hwang, Byung-Kook The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.1

Using differential display techniques, a new acidic pathogenesis-related (PR) protein-1 cDNA (GMPRla) gene was isolated from a cDNA library of soybean (Glycinemax L.Merr, cultivar Jangyup) hypocotyls infected by Phytophthora sojae f. sp. glycines. The 741 bp of fulllength GMPRla clone contains an open reading frame of 525 nucleotides encoding 174 amino acid residues (pI 4.23) with a putative signal peptide of 27 amino acids in the N-terminus. Predicted molecular weight of the protein is 18,767 Da. The deduced amino acid sequence of GMPRla has a high level of identity with PR-1 proteins from Brassica napus, Nicotiana tabacum, and Sambucus nigra. The GMPRla mRNA was more strongly expressed in the incompatible than the compatible interaction. The transcript accumulation was induced in the soybbean hypocotyls by treatment with ethephon or DL-$\beta$-amino-n-butyric acid, but not by wounding. In situ hybridization data showed that GMPRIa mRNAs were usually localized in the vascular bundle of hypocotyl tissues, especially phloem tissue. Differences between compatible and incompatible interactions in the timing of GMPRla mRNA accumulation were remarkable, but the spatial distribution of GMPRla mRNA was similar in both interactions. However, more GMPRla mRNA was accumulated in soybean hypocotyls at 6 and 24 h after inoculation.

유년기(8-12세) 아동에 있어서 악관절장애의 증상에 대한 역학적 연구

이주형(Ju-Hyong Yi),이충국(Choong-Kook Yi),김인권(In-Kwon Kim) 대한턱관절교합학회 1993 구강회복응용과학지 Vol.9 No.2