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Frankel appliance(FR-2)를 이용한 2급 부정교합 환자의 치험례
이긍호,최영철,부성언 大韓小兒齒科學會 1990 大韓小兒齒科學會誌 Vol.17 No.2
The functional regular(FR-2) is a removable orthodontic appliance developed by Rolf Frankel that is used during the mixed and early permanent dentition stages to effect changes in anteroposterior, transverse, and vertical jaw relationship in class Ⅱ malocclusions. This appliance serves as a template against which the craniofacial muscles function. The framework of the appliance provides an artificial balancing of the environment, thereby promoting more normal patterns of muscle activity. The Frankel also influences skeletal and dental development. The appliance removes muscle forces in the labial and buccal areas that restrict skeletal growth, thereby providing an environment that maximizes mandibular growth. The case presented here and the progressive analysis reveals the forward and downward growth of the mandible remarkably. This patient with severe overjet, convex profile, underdeveloped and retrognathic mandible have been treated with FR-2, and forward and downward growth of the mandible was observed.
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이긍호,부성언 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.1
The purpose of this study was to assess the thickness of unpolymerized layers on sealants and to estimate the degree of polymerization of sealants. In this study, amterials used were four kinds of visible light-cured sealants and two kinds of chemically cured sealants. The thickness of unpolymerized layer was assessed by light microscope and the degree of polymerization was analysed by FTIR spectroscopy and following results were obtained. 1. The thickness of unpolymerized layers ranged from 6.33 to 13.89㎛ in light cured sealants and from 67.11 to 75.00㎛ in chemically cured sealants, and the thickness of unpolymerized layer of light cured sealants were thinner than those of chemically cured sealants(p<0.001). 2. As the exposure time incureased, the differences of thickness of unpolymerized layers in light cured sealants were statistically insignificant except differences between 10 seconds group and 20 seconds group of Concise(p<0.01). 3. As the exposure time increased, the increases of degree of polymerization between 10 seconds group and 20 seconds group of Pit & Fissure Sealant and Teethmate-A were statistically significant (p<0.01). 4. The detree of polymerization of Teethmate-A, Fissureseal and Hi-Pol was greater than that of other visible light cured sealants(p<0.01).
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