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호선에 부여한 loop와 교정용 고무가 치궁만곡도 개선에 미치는 영향에 관한 광탄성학적 연구
이병태 대한치과교정학회 1993 대한치과교정학회지 Vol.23 No.4
Multiloop Edgewise Archwire(MEAW) is effective in relief the Curve of Spee in mandibular arch but up & down orthodontic elastics must be used with it. The purpose of this study was to analyse the effect of orthodontic elastics, like as up & down elastics, Class Ⅱ elastics, and Class Ⅲ elastics, and the effect of L loop in multioop Edgewise Archwire. 1. Intrusive force of MEAW in anterior teeth was reduced and uprighting force in premolars was increased by up & down elastics. 2. Uprighting force was significantly increased with Class Ⅲ elastics in multiple L loop arch wire. 3. The force of Class Ⅱ elastics made molars tip mesially and Curve of Spee deep.
박수병,이병태 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.2
The purpose of this experiment was to measure the amounts of nickel and chromium released from a simulated orthodontic appliance in artificial saliva. Simulated mandibular half-arch orthodontic appliances were composed of American Iron and Steel Institute type 304 brackets. Permachrome, Elgiloy, Australian wire, T.M.A.and Nitinol. The amounts of nickel and chromium released from sample were measured with atomic absorption spectrophotometer after 3, 6, 9, 12, 15 days. The cumulative amounts of nickel released from Pemachrome, Elgiloy, Australian wire and T.M.A. reached a plateau after 6 days. But the cumulative amounts of nickel released from Nitinol increased continuously. Significant amounts of both nickel and chromium were solubilized from the simulated orthodontic appliances into artificial saliva. After 15 days, total cumulative amounts of nickel were 152.15㎍, 150.27㎍, 134.74㎍, 114.67㎍ and 93.39μ from the Elgiloy, Australian wire, Nitinol, Permachrome and T.M.A., respectively. Total cumulative amounts of chromium from Permachrome, Australian wire, Elgiloy, Nitinol and T.M.A. were 100.83㎍, 83.64㎍, 81.61㎍, 14.90㎍ and 12.43㎍, respectively. The result showed that nickel released from Elgiloy and chromium released from Permachrome were more than any others.
염정배,이병태 대한치과교정학회 1987 대한치과교정학회지 Vol.17 No.1
The aim of this study was to clarify whether bonding/debonding procedure will affect the occurance of enamel crack. The frequency of enamel crack was compared between before-bonding and after-debonding on 200 human extracted teeth. Each facial surface of the tooth was divided in 9 fragments. A presence of crack, which was classified by its direction as vertical, horizontal and oblique crack, was surveyed in each fragment. Number of all cracks in facial surface was 1355 at before-bonding, and 1605 at after-debonding, so it revealed significant increase rate of 18.5%, but compared by fragment, cracks were significantly increased in OC, OD, CC and GC fragments. All kinds of cracks were significantly increased, especially increase rate of oblique crack reached 54.9%. The increase rate of cracks was not superior at any fragment or region, but some evidence was seen in CC fragment. Judging from the above, increase of crack is unavoidable with bonding/debonding procedures.
연령에 따른 편측성 순구개열자의 안모형태 변화에 관한 연구
김영미,이병태,박수병 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.3
Orthodontic treatment of cleft patients is difficult as the growth is different from that of normal ones. So it is very important to know the characteristic features of the craniofacial morphology and growth pattern in unilateral cleft lip and palate patients. The materials for this study consisted of 55 normal males and 50 unilateral cleft lip and palate ones who received cheiloplasty and palatoplasty previously. The cleft subjects were divided into 4 groups according to their ages kto find out the growth pattern of hard and soft tissue, and to compare the features with those of normal ones. Each cephalogram analysed by McNamara method and others. The obtained results were as follows 1. In the unilateral cleft lip and palate subjects, forward growth of the maxilla was smaller than that of normal ones form 9 years old. So the maxilla was retruded. The maxillary incisors were severely retruded in all age groups. 2. The mandibular overall length and its anteroposterior position did not show any significant differences between two groups. But the height of ramus was very short and the mandible had vertical growth tendency to compensate for undergrowth of the maxilla in cleft subjects after 12 years of age. 3. Horizontal growth of the soft tissue in middle face was smaller than that of any other facial region from 9 years old. The vertical growth rate of upper lip was decreased as growing old. 4. In cleft subjects, the upper and lower facial component angle and the facial convexity angle were large. So their facial profile changed to straight or concave as growing old.
김화민,최제헌,이병로,김태만,윤대현 대구효성가톨릭대학교 자연과학연구소 1991 基礎科學硏究論集 Vol.1991 No.1
CSVT법에 의해 증착시킨 CdS 박막의 전기적 특성 및 열전기 특성을 조사하기 위하여 시료의 X-선 회절, 직류 전기전도도, Hall 이동도 그리고 TSC를 측정하였다. 그 결과 CSVT 법에 의해 제작된 CdS 박막이 보통중착법에 의한 것에 비하여 결정성장이 향상되고 Hall 이동도가 크며 저항이 작다는 것을 알았다. 또한 TSC 측정결과, 광조사 조건에 따라 TSC 피크가 다르게 나타나며 이러한 피크 특성은 photochemical reaction model로서 설명될 수 있고, 그리고 제작조건이 다른 두 CdS 박막에서 나타나는 TSC 피크의 비교로부터 CSVT법에 의해 제작된 시료가 보통증착법에 의한 것보다 상온 이상에서의 photochemical reaction 효과 적음을 알 수 있다. To investigate electrical property and thermally stimulated current (TSC) for the CdS films which were grown by close-spaced vapor transport (CSVT), the measurements of X-ray diffraction pattern (XRD), d.c. conductivity, Hall mobility and TSC were carried out. Form the result of the measurements, CSVT-CdS films are found to be better oriented and to be less resistive with better mobility as compared with the films evaporated by the conventional method. TSC spectra under illumination conditions show different TSC peaks. These can be explained by photochemical reaction model. The result suggests that the effect of photochemical reaction above room temperature is to be less than conventional evaporated films in the case of CSVT-CdS films.
Cyclophosphamide가 백사하악과두의 성장에 미치는 영향에 관한 실험적 연구
이병태(Byung-Tae Rhee) 대한치과교정학회 1982 대한치과교정학회지 Vol.12 No.1
In this study, effects of cyclophosphamide on the growth of the mandibular condyle head were investigated with Spraque-Dawley rats of the 28 days of age. Rats were devided into four groups. Three were used as experimental groups, and one as control. Each rat in experimental group was injected intraperitoneally with cyclophosphamide repeatedly three times, 20mg/kg for the first group, 40mg/kg for the second, and 60mg/kg for the third each time. Rats in control group were injected with physiological salime in the same method. Rate in each group were sacrificed at 5, 10, and 15 days following the 1ast injection. The specimens were stained with H-E, toluidine blue, PAS, and alcian blue. The results were as follows; 1. In experimental group, with increasing the injection doses, the thickness of the condylar cartilage from the transitional zone to the hypertrophic zone became thinner in control group. 2. Weaker metachromasia to toluidine blue and less positive reaction to PAS were seen. 3. In promary marrow cavity the fewer trabecular was formed, the direction of trabecular formation became obscuerer, and the lower density of bone was resulted in.
이병태(Byung-Tae Rhee),이희주(Hee-Ju Lee),양원식(Won-Sik Yang) 대한치과교정학회 1976 대한치과교정학회지 Vol.6 No.1
19 years old female had untreated Veau classification class II cleft palate with ectopic eruption of upper right lateral incisor and congenital missing of lower lateral incisors. Upper left lateral incisor, left first molar aid lower left first molar were root restswithperiapicalpathologiclesions. So all root rests were extracted and prosthodontic rehabilitation after orthodontic treatment was planned. She was treated by means of multibanded system with face bow. After 23 months all orthodontic correction were achieved and, as soos as debanding procedure was done she was referred to oral surgeon and prosthodontist for surgical operation and bridge construction.