The effect of cortical punching on the expression of OPG, RANK, and RANKL in the periodontal tissue during tooth movement in rats / 대한치과교정학회지

OBJECTIVE: The purpose of this study was to investigate whether cortical punching could stimulate the expression of OPG, RANK, and RANKL during tooth movement by immunohistochemistry. METHODS: 34 sprague-dawley rats (15 weeks old) were allocated into 3 groups: TMC group (experimental group; Tooth Movement with Corticotomy, n = 16), TM group (control group; Tooth Movement only group, n = 16), and non-treatment group (n = 2). 20 gm of orthodontic force was applied to rat incisors by inserting elastic bands. The duration of force application was 1, 4, 7 and 14 days. A microscrew (diameter 1.2 mm) was used for cortical punching of the palatal side of the upper incisors in the TMC group. RESULTS: Distributions of OPG, RANK, and RANKL were evaluated by immunohistochemistry. OPG, RANK and RANKL were observed on experimental and control groups. On the compression side, the degree of the expression of OPG decreased in both groups. The expression of RANK was most prominent in the experimental group of day 4. The expression of RANKL was most intensive and extensive in the experimental group of day 7. However, the expression of OPG was decreased in the experimental and control groups compared to the non treatment group. The expression of OPG, RANK and RANKL after force application were decreased at day 14. CONCLUSIONS: These findings suggested that cortical punching might stimulate remodeling of alveolar bone during a 2 week period of tooth movement without any pathologic change.

A Study on the Personality Characteristics of Orthognathic Surgery Patients Through the MMPI / 대한치과교정학회지

This study was designed to evaluate the personality characteristics of orthognathic surgery patients preoperatively and postoperatively through the MMPI. Comparison was made between the personality characteritics of preoperative and postoperative groups. Motivation for undergoing orthognathic surgery and postoperative satisfaction were examined through the questionnaire. Subjects used in this study consisted of 50 patients under presurgical orthodontic treatment and 22 patients who had received orthognathic surgery. From this study, the results were followings. 1. In preoperative patients group, all T-scores were within the normal range except for K-scale. The T-score of K-scale is 57.7, this showed that these patients underwent some or less stress. 2. In postoperative patients group, all T-scores were within the normal range. 3. Only in K-scale, there was statistically significant increase after surgery (P<0.05). 4. In male patients group, all T-scores were within the normal range except for that of preoperative K-scale. Postoperatively, there were statistically significant increase in K and Hs scales(P<0.05) 5. In female patients group, all T-scores were within the normal range. 6. Motivation for undergoing orthognathic surgery could be divided into 4 categories: esthetic goal(28.2%), functional goal(32.1%), TMJ problem(9.0%), and psychosocial reason(30.7%). 7. The degree of postoperative satisfaction was quite high(85.7%). 14.3% of all patients were very satisfied, 71.49/o were satisfied, 9.5% were neither satisfied or dissatisfied, and 4.8% were very dissatisfied.

Evaluation on the psychosocial status of the orthognathic surgery patient before surgeryy / 대한치과교정학회지

This study was undertaken to evaluate the psychosocial status of the preoperative orthognathic surgery patient through SCL-90-R. Subjects used in this study were composed of 67 patients under presurgical orthodontic treatment Males are 40 and females are 27. Comparison between the personality characteristics of male and female patients was made by the t-test. From this study, the results were as follows. 1. In preoperative patients group, all T-scores were within the normal range. 2. In male patients group, all T-scores were within the normal range. 3. In female patients group, all T-scores were within the normal range. 4. Only in PHOB scales, the T-scores of male patients group were higher than those of female patients group. 5. Although all T-scores were within the normal range, 9 patients(13.4% of all patients) shows abnormal T-scores in at least one scale.(T> or =65)