Journal of Yeungnam Medical Science

Byung Rho Chin

26 Articles

Comparision of Mandible Changes on Three-Dimensional Computed Tomography image After Mandibular Surgery in Facial Asymmetry Patients.: Mi Ryoung Kim, Byung Rho Chin; Yeungnam Univ J Med. 2008;25(2):108-116. Published online December 31, 2008; DOI: https://doi.org/10.12701/yujm.2008.25.2.108

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Abstract PDF: BACKGROUND
When surgeons plan mandible ortho surgery for patients with skeletal class III facial asymmetry, they must be consider the exact method of surgery for correction of the facial asymmetry. Three-dimensional (3D) CT imaging is efficient in depicting specific structures in the craniofacial area. It reproduces actual measurements by minimizing errors from patient movement and allows for image magnification. Due to the rapid development of digital image technology and the expansion of treatment range, rapid progress has been made in the study of three-dimensional facial skeleton analysis. The purpose of this study was to conduct 3D CT image comparisons of mandible changes after mandibular surgery in facial asymmetry patients. MATERIALS & METHODS: This study included 7 patients who underwent 3D CT before and after correction of facial asymmetry in the oral and maxillofacial surgery department of Yeungnam University Hospital between August 2002 and November 2005. Patients included 2 males and 5 females, with ages ranging from 16 years to 30 years (average 21.4 years). Frontal CT images were obtained before and after surgery, and changes in mandible angle and length were measured. RESULTS: When we compared the measurements obtained before and after mandibular surgery in facial asymmetry patients, correction of facial asymmetry was identified on the "after" images. The mean difference between the right and left mandibular angles before mandibular surgery was 7degrees, whereas after mandibular surgery it was 1.5degrees. The right and left mandibular length ratios subtracted from 1 was 0.114 before mandibular surgery, while it was 0.036 after mandibular surgery. The differences were analyzed using the nonparametric test and the Wilcoxon signed ranks test (p<0.05). CONCLUSION: The system that has been developed produces an accurate three-dimensional representation of the skull, upon which individualized surgery of the skull and jaws is easily performed. The system also permits accurate measurement and monitoring of postsurgical changes to the face and jaws through reproducible and noninvasive means.

Treatment in Bimaxillary Prognathism with Anterior Open Bite: A Case Report.: Sang Deuk Chun, Byung Rho Chin; Yeungnam Univ J Med. 2004;21(2):242-250. Published online December 31, 2004; DOI: https://doi.org/10.12701/yujm.2004.21.2.242

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Abstract PDF: In general, the skeletal class III has the characteristics of mandibular overgrowth with a normal maxillary growth or maxillary undergrowth with a normal mandibular growth And clinical and radiographic evaluations of the patient are needed. However, the treatment plan is not dependent on these evaluations alone, because patient's general condition and hope for aesthetics varies. The aim of this report is to consider the treatment of a medically compromised patient with an anterior open bite and skeletal class III, which showed a severe mandibular overgrowth. In 2003, a 17-year-old boy with epilepsy, mental retardation presented at our clinic complaining of concave profile. A clinical examination showed severe mandibular prognathism with an anterior open bite. The radiographic examination revealed a short cranial base, a moderate maxillary overgrowth, severe mandibular overgrowth and skeletal open bite tendency. In 2004, he was verified to have no potential of growth by hand-and-wrist radiographs and an endocrine examination. He completed the preoperative orthodontic treatment and orthognathic surgery (sagittal split ramus osteotomy, genioplasty). He was evaluated on the first visit, the preoperative period and the postoperative period with a clinical and radiographic examination. At the first visit, the patient showed moderate overgrowth of the maxilla, severe overgrowth of the mandible, and a subsequential skeletal open bite. After the preoperative orthodontic treatment (preoperative period), the patient showed the same skeletal problem as before and a decompensated dentition for orthognathic surgery. After orthognathic surgery, his profile had improved, but he had still a skeletal openbite tendency because the maxillary orthognathic surgery was not performed. Severe mandibular prognathism with a maxillary overgrowth and anterior open bite should be treated by bimaxillary orthognathic surgery. However, one-jaw orthognathic surgery on the remaining the skeletal open bite tendency was performed for his medical problem and facial esthetics. This subsequential open bite should be resolved with a postoperative orthodontic treatment.

Results of Maxillary Sinus Elevation for Endosseous Implant Placement.: Sang Deuk Chun, Bo Yeon Jung, Seung Eun Lee, Hong Sik Yoon, Byung Rho Chin; Yeungnam Univ J Med. 2003;20(2):169-176. Published online December 31, 2003; DOI: https://doi.org/10.12701/yujm.2003.20.2.169

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Abstract PDF: BACKGROUND
Although dental implantation has become widespread and acceptable treatment for dental prosthodontics, maxillary posterior jaw region is often complicated by the pneumatization of the maxillary sinus and physiological resorption of the alveolar bone. When this occurs, the residual bone between the floor of the sinus and the crestal ridge is inadequate for the placement of implants. The sinus elevation procedure provides a way to increase the amount of available bone and to allow the placement of longer implants. MATERIALS & METHODS: We studied 11 patients requiring the implant placements and the maxillary sinus elevation simultaneously from 1996 to 2003 in our clinic. Nine patients were males and two patients were females, aged from 39 to 72(mean=51.6). Four patients had medical compromised states; angina pectoris, diabetes, hypertension, hepatitis. Patients didn't show any pathologic findings clinically or radiographically. We studied the success and survival rate of implants, factors increasing the osseointegrating capacity of implants. RESULTS: The success rate of osseointegration of implants was 93%. At least 6 months after loading on implants, the survival rate of implants was 78.5%. Autogenous bone graft and adequate residual bone height(>6mm) increased survival rate of implants. CONCLUSION: Successful implant placement with maxillary sinus elevation mainly depends on sufficient residual bone height, healthy maxillary sinus, autogenous bone graft.

Clinical Evaluation about the Immediate Implant Replacement after Tooth Extraction.: Eun Young Yang, Sang Deuk Chun, Jae Hwan Rho, Seung Eun Lee, Jae Chul Song, Byung Rho Chin; Yeungnam Univ J Med. 2003;20(1):45-52. Published online June 30, 2003; DOI: https://doi.org/10.12701/yujm.2003.20.1.45

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Abstract PDF: BACKGROUND
Immediate implant placement has become an acceptable treatment for the edentulous area. The advantages of the immediate implant placement include considerable decrease in time from tooth extraction to placement of the finial prosthesis, fewer surgical procedures, and better acceptance of the overall treatment plans. But the success is dependent on the quantity and quality of the extraction socket. The purpose of this study is to evaluate the success of the immediate implant placement. MATERIALS AND METHODS: Twenty-one sites in 16 patients were selected for the evaluation of the immediate implant placement. All of the cases were followed using clinical and radiographic examinations. Criteria of success were the absence of peri-implant radiolucency, mobility, and persistent pain or sign of infection. RESULTS: Of the 21 implants, 13 implants have been succeeded. Of the 13 implants, 10 implants were replaced for the periodontal disease and 3 implants were replaced for the trauma. CONCLUSION: The criteria of the success in immediate implant placement are as follows. 1) Implants placed into fresh extraction sockets have a high rate of survival. 2) Implant should be placed as close as possible to the alveolar crest. 3) Implant placed into available bone beyond the apex have a high success rate.

Non-Surgical Treatment of Mandibular Condylar Fracture with Functional Appliance: Clinical and Radiographic Analysis of 1 Case.: Sang Deuk Chun, Jae Hwan Rho, Jae Chul Song, Byung Rho Chin; Yeungnam Univ J Med. 2002;19(2):144-150. Published online December 31, 2002; DOI: https://doi.org/10.12701/yujm.2002.19.2.144

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Abstract PDF: Mandibular condylar fracture is common in mandibular fractures. Unlike other facial, skeletal fractures, most of mandibular condylar neck or head fractures are treated with closed reduction and subsequent functional therapy is essential for preventing complications including ankylosis, arthrosis and growth disturbance. From January, 2000 to September, 2002, we have treated 15 cases of mandibular condylar fractures with closed reduction by using functional appliance with bite block. Among these cases, we report a case of 14-year-old female with mandibular condylar neck fracture, resulted in good clinical and radiographic progress.

A Lateral Cephalometric Study of Maxillofacial Morphologic Features in Class III Malocclusion Children.: Woo Ill Sohn, Ic Jun Chang, Jae Chul Song, Byung Rho Chin; Yeungnam Univ J Med. 2001;18(2):208-214. Published online December 31, 2001; DOI: https://doi.org/10.12701/yujm.2001.18.2.208

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Abstract PDF: BACKGROUND
When we make treatment plan of class III malocclusion children, it is difficult to determine whether we treat it with orthognathic surgery or without orthognathic surgery. To determine that, we must consider many factors, such as cephalometric analysis, growth pattern, family history, and skeletal age. A Harvold cephalometric analysis is useful in determining the amount of discrepancy by comparing the maxillary unit length with mandibular unit length. We tried this study to help the decision of treatment planning in class III malocclusion children by comparison in class III malocclusion and normal occlusion children using a Harvold analysis. MATERIALS AND METHODS: The materials for this study consisted of 20 class III malocclusion children. Cephalometric tracing and measurements were performed by one investigator. The control group consisted of 18 normal occlusion children and lateral cephalograms were obtained from 8.5 to 14.5 years old children biannually. The relationships between class III malocclusion group and normal occlusion group were evaluated statistically. RESULTS: The lower anterior facial heights between two groups were not significantly different, although the lower anterior facial heights of class III malocclusion group was higher than those of normal occlusion group in all age groups. The Maxillary-mandibular unit length differences of class III malocclusion group were significantly higher than those of normal occlusion group(p < 0.05). CONCLUSION: A Harvold analysis was useful to make treatment planning for class III malocclusion children.

A Cephalometric Study of Lateral Morphologic Features in Adult Cleft Lip and Palate Patients.: Ic Jun Chang, Woo Ill Sohn, Jae Chul Song, Byung Rho Chin; Yeungnam Univ J Med. 2001;18(1):112-122. Published online June 30, 2001; DOI: https://doi.org/10.12701/yujm.2001.18.1.112

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Abstract PDF: BACKGROUND
Cleft lip and palate deformity have unknown patterns of maxillofacial growth and development. The maxillofacial growth can be affected either by congenital or environmental factors such as infection and trauma. Surgical repair of cleft lip and palate may interfere the subsequent growth and development of maxillofacial region. The purpose of this study is to evaluate the characteristics of maxillofacial growth patterns in adult cleft lip and palate patients. MATERIALS AND METHODS: The material for this study consisted of 17 adult male patients with cleft lip and palate. Cephalometric tracing and measurements were done by one investigator. The relationship between 17 cleft lip and palate patients and Korean norms were evaluated statistically. RESULTS: There were statistically difference in Na, perpendicular to point A, SNA angle, effective maxillary length, maxillofacial differencial, Wit's appraisal and upper incisor to point A (p < 0.01). Pogonion to Na. perpendicular also statistically differed (p < 0.05). Other measurements didn't statistically differ. CONCLUSION: It was evident that in adult cleft lip and palate patients, maxilla was retruded and short. Careful cleft lip and palate repair and treatment are recommended for facilitating normal growth of maxilla.

Clinical Features of the Temporomandibular Disorder Patients with Occlusal Splint Therapy.: Jae Chul Song, Byung Rho Chin; Yeungnam Univ J Med. 1998;15(2):316-324. Published online December 31, 1998; DOI: https://doi.org/10.12701/yujm.1998.15.2.316

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Abstract PDF: This study was performed to evaluate the clinical features and treatment results on 55 temporomandibular disorder patients who had treated by conservative treatment using occlusal splint. The results were as follows; 1. The ratio of men to women was about 1:2.2 and most of the patients were second and third decades. 2. Pain was the most frequent symptom, followed by clicking and mouth opening limitation. 3. The number of acute and chronic groups on the basis of 6 months duration of symptoms were similar. 4. Most of patients had Angle's Class 1 molar relationships(78.2%), followed by Class 3 and Class 2. 5. Centric Relation splints were used alone for treatment of 34 patients and 21 patients were treated with Centric Relation splints and Anterior Repositioning splints. The treatment duration of the patients who had complained pain was average 9.8 weeks and 6 patients of them had slight pain continuously during follow-up. 6. Eleven patient's maximum mouth opening who had mouth opening limitation was improved from 30.7mm to 43.0mm during procedures.

Soft Tissue Change After Single Jaw(mandible) Surgery in Skeletal Class III Malocclusion.: Kwang Soo Park, Hee Kyung Lee, Byung Rho Chin; Yeungnam Univ J Med. 1997;14(1):197-208. Published online June 30, 1997; DOI: https://doi.org/10.12701/yujm.1997.14.1.197

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Abstract PDF

The purpose of this study was to evaluate the amount and interrelationship of the soft and hard tissue change after mandibular setback surgery in skeletal Class III malocclusion. The sample consisted of 25 adult patient (12 male and 13 female) who had severe anteropostrior skeletal discepancy. These patient had received presurgical orthodontic treatment and surgical treatment which is bilateral sagittal split ramus osteotomy. The presurgical and postsurgical lateral cephalograms were evaluated. The computerized statistical analysis was carried out with SPSS/PC program. The result were as follows: 1. After mandibular bilateral sagittal split ramus osteotomy, lower facial soft tissue horizontal posterior changes were high significance value. but vertical soft tissue changes were low significance value. 2. After mandibular bilateral sagittal split ramus osteotomy, relative upper lip protrusion increased(p<0.01) and relative lower lip protrusion decreased(p<0.01) and lower facial soft tissue thickness increased(p<0.01).

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Soft Tissue Changes After Posterior Impaction and Setback of the Maxilla With Le Fort I Osteotomy in Skeletal Class III Patients
Hyeong-Min Jeon, Jin-Young Choi, Seung-Hak Baek
Journal of Craniofacial Surgery.2014; 25(4): 1495. CrossRef

A Case reports of a Surgical Correctiona of the Mandibular Retrusion.: Nan Hee Im, Jin Ho Park, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1995;12(2):393-399. Published online December 31, 1995; DOI: https://doi.org/10.12701/yujm.1995.12.2.393

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Abstract PDF: Mandibular retrusion showing the facial problem with a marked maxillarry incisors protrusion and chin deficiency, resulting in a highly convex profile is uncommon in Korea.. The large incisor overjet and deep-bite create functional limitations and unpleasing esthetic result. The majority of theses cases are susceptible to correction by orthodontic therapeutic methods. But severe Class II retrognathic cases in which orthodontic treatment alone has not been capable of achieving good results. Orthognathic surgery offers several approaches. In this case, mandibular advancement by bilateral sagittal split ramus osteotomy and augmentation genioplasty has a special surgical problems. The suprahyoid muscle gorup are lengthened if the body of the mandible is surgically repositioned anteriorly. Instability of results and relapse return to original position shoud predicted during post-surgical muscular readjustment.. To maintain maximum correction with this technique, it is suggested that the mandibular body be well rotated forward at time of surgical intervention and overcorrected anteriory as much as possible. So, the authors report the case with review of concerned literature.

Diagnostic Reliability & Case Reports Of The Dynamic MRI For Temporomandibular Joint Disease: Jin Ho Park, Byung Rho Chin, Woo Mok Byun; Yeungnam Univ J Med. 1995;12(1):141-148. Published online June 30, 1995; DOI: https://doi.org/10.12701/yujm.1995.12.1.141

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Abstract PDF: The Magnetic resonance imaging has been used widely to evaluate the disk position without any interruption of the TMJ structures, and the dynamic MRI presenting computed serial imaging or the video-recorded simulation images is thought to be very effective to evaluate the disk position under function. This is to study the correlation between the clinical diagnosis and the findings of dynamic MRI for diagnosis of internal derangement of the 7 patients were examined clinically, and the movement of TMJ meniscus was reviewed in the dynamic MRI. MRI was very reliable to diagnose the amount of anterior displacement of articular disc, the structural abnormality of temporomandibular joint, the cause of functional limitation, and to differentiate the muscle related pain & dysfunction

Noninvasive Functional therapy of Mandibular Condylar Fracture.: Jin Ho Park, Jong Sup Kim, Nan Hi Im, Hong Sik Yun, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1994;11(2):398-404. Published online December 31, 1994; DOI: https://doi.org/10.12701/yujm.1994.11.2.398

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Abstract PDF: Functional recovery after mandibular condyle fracture was a contradictory result of many authors. The treatment goal of condyle fracture has been directed primarily toward restoration of functional movement of the mandible. We selected some patients who requested functional therapy in many cases of condylar fracture, depend on pattern of fracture, patient's demand, occlusion, age. Without intermaxillary fixation, we induced the patients to rapid healing of temporomandibular function and normal mandibular protrusive, lateral movement as a result of early functional therapy by activator. So, the authors report the cases with review of concerned literature.

The Distribution and Trend of Malocclusion Patients Visited at Department of Dentistry in Orthodontics.: Jong Sup Kim, Jin Ho Park, Hong Sik Yun, Nan Hi Im, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1994;11(2):323-331. Published online December 31, 1994; DOI: https://doi.org/10.12701/yujm.1994.11.2.323

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1.050 patients who visited orthodontic dental department from 1983 to 1994, were surveyed on the yearly tendency of orthodontic patient distribution and state by means of Angle's classification. The results were as follows : 1. There was increased visiting rate of patient per year and higher visiting rate in female than in male. 2. 8-15 age group was 61.4% in total visiting patients and over 20 age group was 18.5%, under 7 age group was 8.1%. 3. Class I malocclusion was 42.2%, class II div 1 was 22.5%, class II-2 was 3.9%, class III was 29.1% and cleft lip & palate was 2.0% in total visiting patient. 4. As showed the living distribution, Namgu and Susunggu's patients were 43.7% of the total patients. 5. There was increased tendency for the number of the patient to be received orthognathic surgery.

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The effect of a malocclusion status of a patient for orthodontic treatment, a fee for orthodontic and oral health behavior on orthodontic satisfaction
In-Ho Jeong, Sook-Jeong Lee, Si-Duk Lim, Byung-Sik Kim, Young-Dae Park, Ji-Young Park, Jong-Hwa Lee
Journal of Korean Acedemy of Dental Technology.2013; 35(4): 395. CrossRef

A case report of hemifacial microsomia.: Chang Kon Lee, Myung Jin Lee, Jong Sup Kim, Jin Ho Park, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1993;10(1):218-225. Published online June 30, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.1.218

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Abstract PDF: This is a case report and review of literature that deals with hemifacial microsomia corrected by costochondral graft, Lefort I osteotomy and bilateral intraoral sagittal split ramus osteotomy. Patient, 23 years old female, had visited to treat the esthetic problem due to a deviation of jaw. On the basis of clinical and radiographic examinations, she was diagnosed as hemifacial microsomia. First, costochondral graft was performed to bridge the defect between glenoid fossa and body of mandible. After 11 months,. Patient was performed a Lefort I osteotomy and bilateral intraoral sagittal split ramus osteotomy to create a symmetric jaw. Patient was satiesfied with final esthetics and there have been no evidence of infection ill now.

The comparison of influence of difficulties in nasal breathing on dentition between different facial types.: Myeong Jin Lee, Chang Kon Lee, Sup Jong Kim, Jin Ho Park, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1993;10(1):37-47. Published online June 30, 1993; DOI: https://doi.org/10.12701/yujm.1993.10.1.37

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Abstract PDF: It is. commonly assumed that nasorespiratory function can exert a dramatic effect upon the development of the dentofacial complex. Specially, it has been stated that chronic nasal obstruction leads to mouth breathing, which causes altered tongue and mandibular positions. If this occurs during a period of active growth, :the .outcome is development of the "adenoid facies". Such patients characteristically: manifest a vertically long lower third facial height, narrow alar bases, lip incompetence, a long and narrow maxillary arch and a greater than normal mandibular plane angle. But several authors have reported that so-called adenoid facies is not always associated with adenoids and mouth breathing, and that a particular type of dentition is not alwarys found in mouth breathers with or without adenoids. Some authors have believed adenoids lead to mouth breathing in cases with particular facial characteristics and types of dentition. We assumed that the ability to adapt to individual's neuromuscular complex is various. So, we compared the difference of influence of mouth breathing between childrens who have different facial types. This study included 60 patients and they were divided into three groups by Rickett's facial type. Their dentition and tongue position were compared. The results are as follows. 1. There is a significant difference in arch width of upper molars between different facial types. Especially dolichofacial type patients have narrowest arch width. 2. There is a significant difference in tongue position between different facial types. Especially dolichofacial type patients have lowest positioned tongue.

A case of orthognatic surgery in congenital alveolar-palatal cleft patient.: Jae Hyun Park, Myung Jin Lee, Chang Kon Lee, Jong Sub Kim, Byung Rho Chin, Hee Kyung Lee; Yeungnam Univ J Med. 1992;9(1):189-196. Published online June 30, 1992; DOI: https://doi.org/10.12701/yujm.1992.9.1.189

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Abstract PDF: Pre-surgical and post-surgical change in adult clef lip and palate patient following Le Fort I advancement osteotomy combined with bone graft was evaluated clinically and cephalometically. We obtained a successful function and esthetic improvement. The bone graft of alveolo-palatal clefts provides a stable bone support to the adjacent teeth of the cleft area, and well union of adjacent bone tissue, the closure of oronasal fistula and improvement of speech problem. Le Fort I osteotomy following the ostectomy of nasal septum for advancement of the maxilla was obtained relative improvement of esthetics and functional occlusion. 1. The orthodontic correction was required before and after surgery. 2. In this case, there was a limited range of anterior advancement of the Premaxillary-segment due to the scar tissue. 3. After 8 months of operation, we could show the new bone deposition on the cleft sites in dental radiograph and then the prosthetic treatment to the missing teeth was done.

Case reports of bone grafting in unilateral alveolar-palatal cleft patients.: Yun Ho Bae, Jae Hyun Park, Myeong Jin Lee, Chang Gon Lee, Byung Rho Chin, Hee Kyeung Lee; Yeungnam Univ J Med. 1991;8(1):198-205. Published online June 30, 1991; DOI: https://doi.org/10.12701/yujm.1991.8.1.198

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Abstract PDF: We obtained successful functional and esthetic results by grafting of iliac marrow-cancellous bone in 2 cases of alveolar-palatal cleft patients. Bone graft of alveolar-palatal clefts provide bony support to adjacent teeth of cleft area, prevented from relapse of orthodontic arch expansion, closure of oroantral fistula and improvement of speech problem. 1. In one case, extraction of upper right central incisor that was little bone support, alignment of rotated teeth and expansion of collapsed arch segment were done with pre-orthodontic treatment. The other case. Bone grafting was done after removal of prosthesis with no pre-orthodontic treatment. 2. After mucoperiosteal incision in cleft area, the mucosal flap of labial area, palate and nose were separation and the raised nasal mucosa was sutured for closure of oroantral fistula. Then, the iliac marrow-cancellous bones were grafted to cleft site. 3. After 6 months of operation, we had seen the new bone deposition to cleft site in dental radiograph and prosthetic treatment of missing teeth were done.

Roentgenographic Cephalometric Study for Normal Occlusion in Korean Adults According to the Ricketts Analysis.: Byung Rho Chin; Yeungnam Univ J Med. 1990;7(2):131-139. Published online December 31, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.2.131

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Abstract PDF: The purpose of this study was to assess the skeletal characteristics of the maxillofacial norms and the interpretation of craniofacial relations in Korean adults by applying the Ricketts Analysis. The factors of the applied lateral cephalometric measurements were composed of the 10 factor analysis (Summary Analysis) and 7 internal structures to be suggested by Ricketts. Lateral cephalograms were obtained from 60 subjects over 21 years old that consisted of 30 males and 30 females with normal occlusion, acceptable profile. The results were as follow: 1. The tables of means, standard deviations in each item and sex were made. 2. The author performed whether there was significance (P<0.05) between the registered male and female's measurement in each item.

Le Fort I Osteotomy and Posterior Maxillary Segmental Osteotomy for Correction of Malunioned Maxilla.: Hui Dae Park, Yun Ho Bae, Jae Hyun Park, Myeong Jin Lee, Byung Rho Chin, Hee Keung Lee; Yeungnam Univ J Med. 1990;7(1):203-210. Published online June 30, 1990; DOI: https://doi.org/10.12701/yujm.1990.7.1.203

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Abstract PDF: This is a case report of correction of malunioned maxilla after traffic accident by Le Fort I osteotomy and posterior segmental osteotomy. By this procedure, authors obtained the following results. 1. The malunioned maxilla after traffic accident which had anterior crossbite, posterior open bite and scissor's bite were corrected by Le Fort 1 osteotomy and posterior segmental osteotomy. 2. No postoperative infection and specific complication were seen in this case. 3. Postoperative intermaxillary fixation was maintained for 8 weeks. And then, the patient could open his mouth in normal range after a week of intermaxillary fixation removal. 4. For rigid fixation and reducing relapse, the osteotomized maxilla was fixed with miniplates.

A Case Report of Correction of Mandibular Prognathism by Intraoral Oblique Splitting Osteotomy of Mandibular Rami.: Hui Dae Park, Kee Young Doe, Yun Ho Bae, Sang Kill Byun, Byung Rho Chin, Hee Keung Lee; Yeungnam Univ J Med. 1989;6(2):183-194. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.183

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Abstract PDF: This is a report of 2-cases of mandibular prognathism corrected by Intraoral oblique splitting osteotomy of mandibular rami. The Intraoral oblique splitting osteotomy is a modification of sagittal split osteotomy of ramus and it is documented by Yoshida, on 1985. By this method, authors obtained the following results. 1. The patients' esthetic, psychological and functional problems were dissolved by setback of mandibular prognathism. 2. The postoperative infection splitted bone segments fracture, paresthesia of the face and T.M.J. dysfunction were not appeared. 3. Postoperative intermaxillary fixation was maintained for 8 weeks. The patients could open their mouths in normal range after a week of intermaxillary fixation removal. 4. The soft tissue changes of lower lip and chin were about 1:1 to the hard tissue changes. 5. During intermaxillary fixation period and postoperative orthodontic treatment, slight relapse was observed. Now, the patients are under postoperative orthodontic treatment.

Roentgraphic Cephalometric Standard for Maxillofacial Normals with Ideal Occlusion in Korean Adults.: Byung Rho Chin; Yeungnam Univ J Med. 1989;6(1):141-149. Published online June 30, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.1.141

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Abstract PDF: The purpose of this study was to aid the case analysis and diagnosis of the maxillofacial deformities for orthognathic surgery. The applied method for analysis was a Cephalometrics Orthognathic Surgery (COGS) by Burstone. Lateral cephalograms werer obtained from 59 subjects over 21 years old, that consisted of 30 males and 29 females with normal occlusion, acceptable profile. The results were as follows: 1. The author made the tables of means, standard deviations in each item, sex. 2. The author performed whether there was significance (P<0.05) between the registered male and female's measurement in each item.

Osteogenic Sarcoma of the Mandible.: Sang Kil Byun, Hee Kyung Lee, Byung Rho Chin, Tae Ju Kim, Young Joon Kim, Jong Won Kim, Jeung Mee Lee, Kee Young Do; Yeungnam Univ J Med. 1987;4(2):173-178. Published online December 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.2.173

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Abstract PDF: Osteogenic sarcoma is a malignant primary tumor of bone composed of a malignant connective tissue stroma with evidence of malignant osteoid, bone and/or cartilage formation. A 23 year old man was admitted to dental department of Yeungnam University hospital with chief complaint of swelling and pain on alveolar ridge of lower right molar region. It was certain of osteogenic sarcoma through clinical and radiographic features and biopsy. Surgical resection of the lesion was performed by partial mandibulectomy and resin plate insertion. By follow up check of the patient, we made good result of functional reconstruction without any sign of recurrence of the lesion.

Angle's Class II Division 2 Malocclusion Treated by Bioprogressive Mechanism: Report of a Case.: Sang Kil Byun, Hee Kyung Lee, Byung Rho Chin, Meung Chul Oh; Yeungnam Univ J Med. 1987;4(1):151-156. Published online August 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.1.151

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Abstract PDF: A 25 year and 7 month old man patient who had Angle's class II division 2 malocclusion combined with anterior crowding of upper & lower part was treated by bioprogressive mechanism. After setting out objectives through the use of V. T. O., we programmed a sequence of mechanic. The possible objectives of treatment in the class II division 2 malocclusion can be listed as follows. 1) Relief of crowding & irregularities. 2) Relief of anterior gingival trauma & correction of interincisal inclination. 3) Correction of buccal segment relationship We'd applied the class II intermaxillary elastics, Quad helix, utility arch wire and sectional arch wire in order to achieve anticipated objectives. As compared with pre & post treatment cephalogram, the result accomplished by this mechanics showed to us that interincisal angle was improved and favorable molar relationship was achieved.

Surgical Treatment of Phenytoin Induced Gingival Hyperplasia: A Report of Case.: Sang Kil Byun, Hee Kyung Lee, Byung Rho Chin, Meung Chul Oh; Yeungnam Univ J Med. 1986;3(1):383-386. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.383

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Abstract PDF: Enlargement of the gingival caused by phenytoin. An anticonvulsant used in the treatment of epilepsy, occurs in some of the patients receiving the drug. Its incidence varies from 3 to 62 percent, with the greater frequencies in younger patients. The hyperplasia is usually generalized throughout the mouth, but is more severe tendency in the maxillary and mandibular anterior regions. 18 year old male patient was admitted to our Department of Dentistry with the complaint of generalized painless gingival swelling. After the consult of the N.M. and laboratory study, the gingivectomy and gingivoplasty was performed. The periodontal pack and tin foil was applied on the attached gingival to protect a surgical site and bleeding control. We obtained a good result of improved esthetics and function.

A Study of Types and Distribution of Orthodontic Patients in the Department of Dentistry.: Sang Kil Byun, Hee Kyung Lee, Byung Rho Chin; Yeungnam Univ J Med. 1986;3(1):243-247. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.243

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Abstract PDF: 174 patients who visited in the Department of Dentistry, College of Medicine, Yeungnam University from 1983. 7. 15 to 1986. 11. 30 were surveyed on the tendency of patient distribution and the state of Angle's classification. The results were as follows 1. There was increased visiting rate of patient per year. Female outnumbered male by a ratio of 1.3:1. 2. 8-15 age group was 74% in total visiting in the most frequency. The average visiting numbers of each month were higher among the vacation and was about 74% in that period. 3. As showed the living distribution, Nam Go and Su Sung Gu's patients were 53% of the total. 4. As the motive of visiting in Dental Department, patient of 30% in total patients visited for themself to receive orthodontic treatment and other was introduced patients. 5. By classification, Class I malocclusion was 63% in total visiting patient, Class II malocclusion 17%, Class III malocclusion 20%. Crowding among Class I malocclusion was 60%.

Combined Surgical and Orthodontic Treatment of Bimaxillary Dento-Alveolar Protruvion: A Report of Case.: Sang Kil Byun, Hee Kyung Lee, Byung Rho Chin, Meung Chul Oh, Tae Ju Kim, Young Joon Kim; Yeungnam Univ J Med. 1985;2(1):271-279. Published online December 31, 1985; DOI: https://doi.org/10.12701/yujm.1985.2.1.271

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