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Diode Laser 조사가 가토경골의 골재형성에 미치는 영향에 관한 연구
강봉기(Bong Ki Kang),천재식(Gae Sig Chun) 대한구강악안면병리학회 2010 대한구강악안면병리학회지 Vol.34 No.6
Currently, Low-level laser therapy (LLLT) is widely used in medicine and dentistry. It has been suggested that LLLT may be beneficial in management of many different medical conditions, including pain, wound healing and nerve injury. Stimulation with LLLT can enhance bone repair as reported in experimental studies on bone defects and fracture healing also. As far as hard tissue is concerned, the biostimulating effect of laser has been demonstrated more rapid healing of tibial bone fracture in mice. This study was performed to compare new bone formation between with LLLT and without LLLT. Two cylinder implants(5mm diameter, 5mm length) were implanted on rabbit's tibia. LLLT was done to one implant with 632mm diode laser. And than Rabbit's were sacrificed after 2nd, 4th, 6th, 8th weeks after implantation. Bone with implant were removed and fixed with 10% formaline. Undecalfied sample were prepared after spurr low resin embedding. Sample were grind and polished to 100㎛. The results were as follows. The amount of trabeclue of experimental group were superior to that of control group from 2 weeks to 8 weeks. There were no difference in arrangement of trabecule between two groups. Bone implant contact were significantly increased at 4th weeks in experimental group. The number of ostecytes in trabecule were different at 4th weeks experimental group. Osteone were appeared dominantly at 6th weeks experimental group, while at 8th weeks experimental group were superior than control group. LLLT group showed increased amount of trabecule, bone implant contact, number of osteocytes & osteone. It suggested that LLLT might be increase the bone formation rate and accelerate the bone formation time.
정중구개봉합의 급속확대술에 의한 Angle씨 3급부정교합의 교정치험예
강봉기(Kang Bong-Ki),서정훈(Seo Jeong-Hoon) 대한치과교정학회 1977 대한치과교정학회지 Vol.7 No.1
The patient, 18-year-old girl, had a class III malocclusion with the lateral compression of the maxilla due to the premature loss of the canines, mild mandibular prognathism, and mouth breathing habit. The treatment plan consisted of 1) rapid maxillary expansion 2) a period of retention 3) extraction of the first mandibular premolars instead of surgical correction 4) completion of orthodontic treatment with multibanded system. The maxilla was separated in the midline by the application of orthopedic forces via a cemented rapid maxillary expansion device. After 18 months, She gained functional overbite-overjet relationship, good interdigitation of buccal segments, and facial harmony due to the retraction of lower anterior teeth.
강봉기(Bong-Ki Kang) 대한치과교정학회 1977 대한치과교정학회지 Vol.7 No.1
The purpose of this study was to investigate the resorption potential in human permanent teeth by analyzing the frequency and the degree of root resorption as revealed by routine intraoral roentgenograms. The following conclusions were obtained: 1) The distribution of root resorptions was as follows; a) 65.3 per cent were no root resorption. b) 7.0 per cent showed questionable root shortening. c) 25.2 per cent were definite root shortening. d) 2.5 per cent showed very severe resorption. 2) The order of susceptibility of teeth to resorption in this study was consistent with other studies. 3) The maxillary teeth showed a much higher incidence (52.2 per cent) than the mandibular teeth (17.1 per cent) 4) The sex ratio of the sample in this study was 1.3 female to 1 male.
Prostaglandin E가 백서의 치아이동시 치조골 흡수에 미치는 영향에 관한 실험적 연구
강봉기(Kang Bong Ki),서정훈(Suhr Cheong Hoon) 대한치과교정학회 1983 대한치과교정학회지 Vol.13 No.2
Faces of normal occlusion, open bite and class-111 malocclusion were measured using cephalogram in 190 finale and female subjects. Using M.K.G., types of mandibular movement, amount of horizontal -and vertical movement were studied in relation to. occlusal types, and were compared with each other. The following conclusions were obtained. 1 Movement of protrusion was most different in relation to occlusal type. In normal occlusion, maximal protrusion were horizontal 7.66mm, vertical 3.01mm in male, 6.41, 2.92mm respectively in female and maximal inferior position were -24.32, 33.63mm in male, -23.48, 32.27mm respectively in female. 3. Angle between maximal inferior position and horizontal plane were 53.510 in male, 53.84° in female. 4. Generally, amount of mandibular movement was greater in male than female. 5. In open bite, path of protrusion was nearly straight without curve 69.2% in male, 70.2% in female. 6. In class III malocclusion, angle and amount of protrusion were smaller than normal occlusion and path was directed anterior-superiorly in 22.7%. 7. There was no correlation coefficient between measurement of face and mandibular movement.