악골의 낭종에 관한 임상적 연구

임재석(Jae Suk Rim),장현석(Hyon Seok Jang),손형민(Hyoung Min Son),남영원(Young won Nam) 대한구강악안면외과학회 2000 대한구강악안면외과학회지 Vol.26 No.3

The purpose of this study is to find the histopathological pattern of cysts. We reviewed the hospital chart, out-patient chart, roentgenogram, histopathologic report and operation report of 152 patients who had been diagnosed as cyst and treated at the department of Oral and Maxillofacial Surgery of Korea university hospital between Jan. 1, 1995 and Dec. 31, 1998. And then we studied clinically with regard to pathological classification, age and sex distribution, anatomical distribution and so on. The results were as follows: 1. In pathologic classification, radicular cyst (97cases, 64%), dentigerous cyst (35cases, 23%), odontogenic keratocyst (8cases, 5.3%) were dominant among cases of cyst. 2. The pattern of age distribution in cases of radicular cyst, dentigerous cyst and odontogenic keratocyst was similar to that found in previous studies. The peak incidence was in the second decade (27%) and third decade (29%) in overall cases. 3. The male-to-female ratio was 1.9:1. 4. Radicular cyst occured most frequently in the maxillary incisor teeth area, dentigerous cyst in mandibular wisdom teeth area, and odontogenic keratocyst in mandibular molar area.

하악구치부 유리단결손의 임플란트 수복에 관한 임상적 연구

손형민,오화선,임재석 고려대학교 임프란트 연구소 2000 임프란트연구지 Vol.2 No.1

Many long-term study have demonstrated the successful use of osseointegrated implants to replace posterior teeth in the partially dentate patients. Implant were recently selected as the treatment of the choice for this population, instead of the previous resolves for the shortened dental arch (removable partial dentures, single or multiple cantilevers, or continued premolar occlusion). Advantages of patients with implant-supported prosthesis included an improved masticatory apparatus, reduced stress on the remaining anterior segments of the dentition, esthetics, comfort, and psychological benefits etc. But, there are many obstacle to implant placement in posterior mandible. The shape, quantity, and quality of bone in the mandible as anatomicla limitation and heavy occlusal force as mechanical disadvantage are significant factors in deciding which implant options possible. Consideration of these factors is necessary for the successful diagnosis and implant treatment of partially edentulous arches. PURPOSE : The purpose of this retrospective longitudinal study is to evaluate the long-term outcome, determinants of outcome, and the type and prevalance of prosthetic complications in the series of the patients treated with implants in the partially edentulous posterior mandible. MATERIAL AND METHODS : A total of 107 consecutively placed implants were inserted in 38 partially edentulous patients and restored with single-tooth and fixed partial dentures restoration at Korea University Guro-hospital from April 1991 to December 1999. The patients ranged in age from 22 to 72 years, and 54% were female. We analysed statistically long-term outcome according to type. RESULTS : The results were as follows : 1. The overall outcome showed an implant success rate of 97.2% in posterior partially edentulous mandible 2. In the proportion of the fixture length ; 10mm (22.4%), 11.5-12.0mm (19.6%), 13.0mm (19.6%) fixture were respectively predominant in order. In the proportion of the fixture width ; 3.75mm (47.7%), 5.0mm (36.4%) were predominant in order. 3. According to surface types of fixture, success rate were pure titanium 95.9%, TPS coating 100%, HA coating 100%. 4. A total of the 107 implants showed 20 complications (18.7%) the most common complications (7cases) was loosening of the abutment screw and gold screw. 5. Prosthetic complications with regard to fixture number showed higher prevalence one implant (30%) two implant (12.9%), three implant (11.1%) in order. 6. According to the prosthetic type, complications of screw type were 10 cases and cementation type were 4 cases. CONCLUSION : This study offers efficacious results of implant supported fixed prostheses as an alternative to traditional prostheses in patients with posterior partial edentulism. Therefore, we think that implant prosthesis is a relatively safe and predictable method for restoring partially posterior edentulous areas.

전치부 개교합을 가진 골격성 제 Ⅲ급 부정교합 환자에 있어서 하악지 시상분할 골절단술후 술후 안정성에 관한 평가

임재석,권종진,장현석,손형민,남영원,최철민 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.6

The purpose of this study is to assess the postoperative stability and the tendency of relapse after both sagittal split ramus osteotomy in skeletal class III with anterior open bite. This retrospective study was based on the examination of 15 patients, 6 males and 9 females, with a mean age 23.1 years. The patients were divided into two groups based on the amount of preoperative overbite(group I:<1mm, group II:≥1mm). Serial lateral cephalometric radiographs were taken within 2 weeks preoperatively, within 1 week postoperatively and at a follow up period that ranged from 7 to 24 months postoperatively. All cephalometric radiographs were traced and digitized using the Quick ceph image Pro for analysis. And then, horizontal and vertical changes of reference points(B point, Pogonion, L1) were assessed by the linear measurements in millimeters on both axes. The results were as follows : 1 Mean horizontal relapses were 0.67±0.93mm (11%) at B point (P<.05) and 0.81±1.01mm (13.2 %) at Pogonion (P<.01). 2, Mean vertical relapses were 0.63±1.62mm (33.3%) at B point and 0.53±1.95mm (31.4%) at Pogonion (P>.05) 3. The mean angular change of occlusal plane to SN was 0.24±1.19 (P>.05) and that of mandibular plane to SN was 1.03±1.85 (P<.05). 4. There was correlation between the extent of preoperative overbite and the postsurgical relapse at B point and Pogonion. 5. There was no correlation between the amount of surgically produced horizontal movement and the postoperative horizontal relapse at B point.

골격성 제3급 부정교합환자의 하악지 시상분할 골절단술후 하안면 폭경 및 고경의 변화에 대한 두부계측 방사선학적 연구

장현석,임재석,권종진,이부규,손형민 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3

Purpose : The purpose of this study was to analyze the lower third facial changes in frontal view after mandibular setback surgery. Materials and Methods : In this study, fifteen subjects(6 males and 9 females) with class III dental and skeletal malocclusions who were treated with BSSRO(Bilateral Sagittal Split Ramus Ostetomy) were used. Frontal cephalometric radiographs were taken preoperatively and more than 6 months postoperatively, and hard tissue(H2-Hl) and soft tissue changes (S2-S1) were measured on vertical and horizontal reference lines. In 15 cases, changes which developed more than 6 months after surgery were studied. Results : The results were as follows. 1.In the facial height, hard tissue decreased(2.46±2.76mm) with statistical significance(P<0.01), and soft tissue also decreased(1.64±3.66mm). As a result, the facial height generally becomes shorter after sagittal split ramus osteotomy. 2.In the mandibular width, hard tissue decreased(2.08±3.59mm) with statistical sgnificance(P<0.05), but soft tissue increased (2.14±5.73mm) without statistically significant difference (P>0.05) postoperatively. 3.In the facial index, hard tissue decreased(0.23±2.21%), but soft tissue increased(2.41±3.46%) with statistical significance. Conclusion : One of the main purpose of orthognathic surgery is to achieve facial esthetics and harmony. In order to fullfill this purpose, it is important to carry out a precise presurgical treatment planning by estimating the changes of frontal profile after surgery.