ABSTRACT
Subject(s)
Adolescent , Humans , Dentistry , Dentofacial Deformities , Osteotomy , Root Resorption , ToothABSTRACT
The contour of mandibular angle is important for facial esthetics in the oriental population, because the wide and square face is thought to have had an unhappy life. A prominent mandibular angle produces a characteristics quardrangle, coase, and muscular appearance. So, uni- or bi-lateral mandibular angle reduction is usually performed. However, there is little guideline for bi-lateral angle reduction. So, this study was to investigate the pattern of Korean mandibular angle for bi-lateral mandibular angle reduction as guideline. This study was included 66 adult men and women over 19 years old who are having the normal mandibular angle. We measured the posterior border, angle, and inferior border of mandible using cephalometric view. The results of study was as followed : 1. The ratio of posterior mandible was 96.6, 97.3% in male, and 103.0, 106.0% in female. 2. The ratio of mandibular angle(R1-Go/R1-R2) was 120.2% in male, and 117.3% in female. 3. The ratio of inferior mandible(D5, 6, 7, E, F, G/D4) was 97. 3, 90.9, 79.5, 65.2, 57.8, 46.9% in male, and 98.5, 91.2, 80.5, 67.6, 59.1, 50.2 % in female. The results of this study should be useful to decide accurate amount of reduction.
Subject(s)
Adult , Female , Humans , Male , Young Adult , Esthetics , MandibleABSTRACT
The retraction of anterior teeth could be performed more easier by inducing of skeletal anchorage system rather than by conventional method on orthodontic treatment. But, we wonder how effective the system draws well without anchorage loss and draws anterior teeth aside posteriorly, and if the system can reduce the time, in comparison with the anchorage of posterior teeth. For that reason we have studied on the subject of patients, who were required the maximum anchorage on orthodontic treatment and the cases without crowding. The subjects of the experimental group are 35 areas of 20 people who were inserted miniscrews after Mx or Mn 1st premolar extracted. Also, the subjects of the control group are 81 areas of 45 people who were not inserted miniscrews. Compared the anchorage loss of experimental group with control one, we could get the result that the anchorage loss of experimental group is 1.034+/-0.891mm and control group is 2.790+/-1.882mm(P<0.01). Compared the space closing time of experimental group with control one, we could get the result that the space closing time of experimental group is 369.40+/-110.81days and control group is 406.56+/-231.63days. But the result of comparing space closing time has no significance in statistics. We recognized that the experimental group is more faster than the control group in the canine retraction velocity from the result ; the speed of a experimental group has as much as 0.60+/-0.23mm/30days while the speed of a control group has 0.44+/-0.35mm/30days(P<0.05). So, we could convince that orthodontic miniscrew is used effectively in the cases required the maximum anchorage.
Subject(s)
Humans , Bicuspid , Crowding , ToothABSTRACT
At orthodontic treatment, we have made every effort to get rigid anchorage which is not stirred when teeth move. As a result, the miniscrew that is rigid anchorage was invented recently, and now it is used widely. Concerning the advantage of miniscrew, it is reduced dependence of extraoral anchorage and it shortens treatment time for rapid tooth movement. In contrast, the defect of miniscrew is falling off it resulted from increasing of the mobility. So the purpose of this research is to be of help to prognose clinical use of miniscrew, which is inserted for intraoral anchorage, by investigating and comparing the failure rate of miniscrew for loading time. This study researches the failure rate of miniscrew for teeth movement at the orthodontic treatment. The failure rate of miniscrew in mid course, after inserting 147 miniscrews in 51 patients, is 13%(20/147). It showed no statistically significant differences as compared man with woman, maxilla with mandible, double-head with uni-head miniscrew, and drilling and non-drilling before inserting the miniscrew. In comparison below twenties with over twenties and the times that we give load to miniscrew, it produced that the failure rate of miniscrew is 9.7% higher in the case of below the twenties than over the twenties. Also, the failure rate of loading immediately is 10.8% higher than loading after 7 days. According to using driver for the insertion of miniscrew, the failure rate of miniscrew is higher in the case of using machined driver than in the case of using hand driver when the level of significance is 95%. According to the research, we can suppose that the failure rate has no concern with using miniscrew on man or woman, maxilla or mandible, the shape of head, and drilling or non-drilling before insertion of miniscrew. Therefore, we can choose eclectic miniscrew as demands. In addition, we must notify the patient, below twenties, to be possibility of high failure rate. And It is strongly recommended to give load after 1.2 weeks for healing of the insertion area.
Subject(s)
Female , Humans , Hand , Head , Mandible , Maxilla , Tooth , Tooth Movement TechniquesABSTRACT
Subject(s)
Collagen , Cyclosporine , Extracellular Matrix , Gingival Overgrowth , Graft Survival , Hemorrhage , Kidney , Kidney Transplantation , Nifedipine , Oral Hygiene , Organ Transplantation , Orthodontic Appliances , Phenytoin , Quality of Life , Transplantation , TransplantsABSTRACT
The facial patterns were expressed by the interrelation of variable factors such as heredity, function and environment. Such variable factors have an effect on the growth and development of maxillofacial bones. The malocclusions with skeletal discrepancies are caused by abnormal forms, sizes and positions of cranial base, maxilla and mandible. For the proper diagnosis and treatment planning, the analysis of such structures is necessary. Lateral cephalograms of 54 adults with class III malocclusion patients (test group) and 61 adults with normal occlusion (control group) were analyzed. Anteroposterior relations and sizes of cranial base, maxilla, mandible were estimated to compare with those of normal ones. In test group, the anterior cranial base length was within normal range, but posterior cranial base, maxilla and mandibular body were longer than those in control group, significantly. Based on the cranial base, the location of maxilla in test group was normal, but the location of mandible was more anterior than that in control. Based on the maxilla, the location of mandible was more anterior in test group than that in control. Both mandibular body and ramus anteroposterior lengths in test group were larger than those in control. Both mandibular plane angle and upper gonial angle were within normal range, but lower gonial angle was significantly high in test group.
Subject(s)
Adult , Humans , Diagnosis , Growth and Development , Heredity , Malocclusion , Mandible , Maxilla , Reference Values , Skull BaseABSTRACT
Anatomical shape of the mandibular ramus, which includes the area from the rear of the mandibular second molar to the mandibular posterior border and from the mandibular sigmoid notch to the inferior mandibular border, must be carefully considered to perform orthognathic surgery. The locations of the lingula and mandibular foramen in medial side of mandibular ramus are one of the most important factors to decide the location of the horizontal medial osteotomy in sagittal split ramus osteotomy and to select the line of vertical osteotomy in intraoral vertical ramus osteotomy. Sixty-five different Korean human dry mandibles were surveyed. All mandible have permanent dentition including complete eruption of the mandibular second molar. The locations of the lingula and mandibular foramen in medial side of the ramus were identified and following results were obtained. Anterior ramal horizontal distance from lingula was 16.13+/-3.53mm(range:8.6~24.3mm), anterior ramal horizontal distance from mandibular foramen was 23.91+/-4.79mm(range: 14.1~39.7mm), horizontal width of mandibular foramen was 2.79+/-0.95mm(range: 1.5 ~6.1mm), height of lingula was 10.51+/-3.84mm(range: 3.1~22.4mm), vertical distance from sigmoid notch to lingula was 19.82+/-5.11mm(range: 9.1~35.3mm). From this study, the result could be used to select the location of osteotomy lines and to decide amount of periosteal elevation to avoid injury of neurovascular bundle, and to accomplish the appropriate split in Korean patients in mandibular orthognathic surgery.
Subject(s)
Humans , Colon, Sigmoid , Dentition, Permanent , Mandible , Molar , Orthognathic Surgery , Osteotomy , Osteotomy, Sagittal Split RamusABSTRACT
Subject(s)
Female , Humans , Male , Bicuspid , Biopsy , Dentistry , Incidence , Mandible , Maxilla , Molar , Periapical Abscess , Periapical Granuloma , Radicular Cyst , ToothABSTRACT
The development and progression of oral cancer is associated with an accumulation of multiple genetic alterations through the multistep processes. Comparative genomic hybridization(CGH), newly developed cytogenetic and molecular biologic technique, has been widely accepted as a useful method to allow the detection of genetic imbalance in solid tumors and the screening for chromosome sites frequently affected by gains or losses in DNA copy number. The authors examined 19 primary oral squamous cell carcinomas using CGH to identify altered chromosome regions that might contain novel oncogenes and tumor suppressor genes. Interrelationship between these genetic aberrations detected and major oncogenes and tumor suppressor genes previously recognized in carcinogenesis of oral cancers was studied. 1. Changes in DNA copy number were detected in 14 of 19 oral cancers (78.9%, mean: 5.58, range: 3~13). High level amplification was present in 4 cases at 9p23, 12p21.1~q13.1, 3q and 8q24~24.3. Fourteen cases(78.9%, mean: 3.00, range: 1~8) showed gains of DNA copy number and 12 cases(70.5%, mean: 2.58, range: 1~9) revealed losses of DNA copy number. 2. The most common gains were detected on 3q(52.6%), 5p(21.0%), 8q(21.0%), 9p(21.0%), and 11q(21.0%). The losses of DNA copy number were frequently occurred at 9p(36.8%), 17q(36.8%), 13q(26.3%), 4p(21.0%) and 9p(21.0%). 3. The minimal common regions of gains were repeatedly observed at 3q24~26.7, 3q27~29, 1q22~31, 5p12~13.3, 8q23~24, and 11q13.1-13.3. The minimal common regions of losses were detected at 9q11~21.3, 17p31, 13q22~34, and 14p16. 4. In comparison of CGH results with tumor stages, the lower stage group showed more frequent gain at 3q, 5q, 9p, and 14q, whereas gains at 1q(1q22~31) and 11q(11q13.1~13.3) were mainly detected in higher stage group. The loss at 13q22~34 was exclusively detected in higher stage. The results indicate that the most frequent genetic alterations in the development of oral cancers were gains at 3q24~26.3, 1q22~31, and 5p12~13.3 and losses at 9q11~21.3, 17p31, and 13q. It is suggested that genetic alterations manifested as gains at 3q24~26.3, 3q27~29, 5p12~13.3 and 5p are associated with the early progression of oral cancer. Gains at 1q22~31 and 11q13.1~13.3 and loss at 13q22-34 could be involved in the late progression of oral cancers.
Subject(s)
Humans , Carcinogenesis , Carcinoma, Squamous Cell , Comparative Genomic Hybridization , Cytogenetics , DNA , Genes, Tumor Suppressor , Mass Screening , Mouth Neoplasms , OncogenesABSTRACT
Subject(s)
Humans , Carcinogens , Cytochrome P-450 CYP1A1 , Cytochrome P-450 CYP2E1 , Cytochrome P-450 Enzyme System , Cytochromes , DNA Repair , Exons , Genes, Suppressor , Genetic Predisposition to Disease , Genotype , Head and Neck Neoplasms , Head , Metabolism , Neck , Negotiating , Oncogenes , Polymorphism, Genetic , XenobioticsABSTRACT
0.05). 3. There were no statistically significant differences in the condylar ratio between the groups (p>0.05). 4. There were no statistically significant differences in the discrepancies of the left and right ramus length measurements between the groups (p>0.05). 5. The relative size of condyle to fossa in the group of temporomandibular disorders was smaller than that in the normal group (p<0.05).
Subject(s)
Humans , Temporomandibular Joint Disorders , Temporomandibular Joint , VolunteersABSTRACT
Subject(s)
Humans , Genioplasty , Incisor , Lip , Maxillary Osteotomy , Orthognathic Surgery , Osteotomy , Osteotomy, Sagittal Split Ramus , Prognathism , Surgery, OralABSTRACT
Subject(s)
Female , Humans , Middle Aged , Antibodies, Antinuclear , Arthritis, Rheumatoid , Autoimmune Diseases , Biopsy , Brain , Butterflies , Drug Therapy , Endothelium , Immune System , Liver , Lupus Erythematosus, Systemic , Lymph Nodes , Lymphoma , Maxilla , Oncogenic Viruses , Sjogren's SyndromeABSTRACT
For the establishment of the basis of treatment and study in the patients of facial bone fracture, we performed a clinico-statistical study about 28 papers and 9564 cases reported as facial bone fractures in the journal of Korean association of oral and maxillofacial surgeons, the journal of the Korean academy of maxillofacial plastic and reconstructive surgery, and related journals. The results were as follows: 1. The ratio of men to women was 4.50:1. 2. The age frequency was highest in the third decade(37.6%), and fourth(21.5%), second(15.5%), fifth(10.3%) decade in orders. 3. The most common location of facial bone fractures was the mandible(62.7%), and zygoma complex (22.6%), nasal bone(15.0%), and maxilla(13.0%) were next in order of frequency. 4. The major etiologic factors were traffic accident(37.9% ), fisticuffs(26.4%), and falldown and slip down(23.4%). 5. The frequent fracture site of mandible is symphysis(39.3%), angle(24,4% ), and condyle(22.5%). The ratio of left to right was 1.31:1. Open reduction(69.1%) was the more frequently using method of treatment in mandibular fracture than colsed reduction (28.6%). 6. The sites of zygoinatic fractures were zygoma complex(48.0%), zygornatic arch(35.7%), and combined(16.3%). The left to right ratio was 1.37:1. 7. The most frequent maxillary fracture was Le Fort I (31.4% ), and Le Fort II (27.1%), unilateral(14.3%), Le Fort III (7.6%) were next in order of frequency.
Subject(s)
Female , Humans , Male , Facial Bones , Mandible , Mandibular Fractures , Maxillary Fractures , Plastics , Statistics as Topic , ZygomaABSTRACT
No abstract available.