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Segmented TMA T-loop spring 에의한 견치 후방이동시의 응력분포에 관한 광탄성법적 분석
유필식 朝鮮大學校 口腔生物學硏究所 2001 Oral Biology Research (Oral Biol Res) Vol.25 No.1
Retraction of the canines represents a fundamental stage in a considerable number of orthodontic treatments. The patient who have anterior arch length problems with anterior crowding required separate canine retraction. Controlled canine retraction requires the creation of a biomechanical system to deliver a predetermained force and a relatively constant moment to force ration in order to avoid distal tipping movement. The segmented TMA T-loop spring. used for reciprocal space closure and described by Burstone, was used to achieve bodily movement of canine. Photoelastic analysis is a technique for the transformation of internal stress into visible light patterns. The two-dimensional photoelastic stress analysis was performed, and stress distribution was recorded by photography. The purpose of this study was to visualize photoelastically the distribution of forces transmitted to the alveolus and surrounding structures using new segmented TMA T-loop spring for canine retraction. The results were as follows: 1. Decreased activation produced decreased stress of upper 1st. premolar extraction site and increased intrusive stress of upper 1st. molar. regardless of T-loop position. 2. At 5㎜ activation. More posterior positioning of T-loop produced an increased stress in upper 1st. premolar extraction site. 3. At 3㎜ activation. More posterior positioning of T-loop produced an increased stress in upper 1st. premolar extraction site and mesial lower half of upper 1st. molar mesio-buccal root. 4. At 1㎜ activation. More posterior positioning of T-loop produced an increased stress in upper mesial and blew apex area of upper canine root. 5. 0.25 B/L ratio and 3㎜ activation produced bodily movement of canine. To summarize. desired tooth movement and anchorage requirement is possible by altering the activation and mesio-distal position of the T-loop spring.
유필식,김동훈,김중한,이승미,김미애,박관수,박형수,임한호,윤영주,김광원 朝鮮大學校 口腔生物學硏究所 2000 Oral Biology Research (Oral Biol Res) Vol.24 No.2
Class Ⅲ malocclusion occurs in the number of patients of Asians and is one of the most difficult types of malocclusion to treat Class Ⅲ malocclusion primarily results from maxillary skeletal retrusion and mandibular skeletal protrusion, and combination of both. Treatment of Class Ⅲ malocclusion usually includes growth modification (Fra¨nkel. Face mask, Chin cup etc.), comprehensive orthodontic therapy, either combined with extraction and/or orthognathic surgery. This study describes the diagnosis and treatment methods of Class Ⅲ malocclusion with the illustrations of clinical cases.
이승미,김미애,박관수,박형수,임한호,윤영주,김광원,유필식,김동훈,김중한 朝鮮大學校 口腔生物學硏究所 2001 口腔生物學硏究 Vol.25 No.2
The most common Class Ⅱ malocclusion is one that is caused by an underlying Class Ⅱskeletal discrepancy. The Class Ⅱ malocclusion that is present in an individual with a normal skeletal jaw relationship is less frequent and caused by forward movement during dental development of the maxillary molars relative to the mandibular molars. This less common condition may be unilateral or bilateral in presentation. There are two alternatives for treatment of the dental Class Ⅱ malocclusion : a nonextraction approach involving distal movement of the maxillary teeth and the extraction approach involving unilateral or bilateral extractions. This study describes the diagnosis and treatment of Class Ⅱ malocclusion with the illustrations of clinical cases.