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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.
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.
Segmented TMA T-loop spring에 의한 견치 후방이동시의 응력분포에 관한 광탄성법적 분석
유필식,윤영주,김광원 대한치과교정학회 2001 대한치과교정학회지 Vol.31 No.2
본 연구는 교정치료를 시행함에 있어 전치부 crowding을 해결하기 위한 견치의 단독견인 방법중 새로운 segmented TMA T-loop spring으로 견치 후방견인시 치근단과 그 주위 치조골에서의 응력상태를 알아보기 위해 시행되었다. PL-3 epoxy resin으로 광탄성 모형을 제작하여 B/L ratio가 0.25, 0.5, 0.75인 위치로 T-loop을 위치시키고 각 위치에서 5mm, 3mm, 1mm activation하였다. 이후 광탄성 응력 해석장치를 이용하여 견치견인시 치근단과 그 주위 치조골에서의 초기 응력 상태를 광탄성법으로 분석한 바, 다음과 같은 결론을 얻었다 1.T-loop 위치에 상관없이 activation량이 감소할수록 상악 1소구치 발치부위에 응력이 감소하였고 상악 1대구치의 함입응력은 증가하였다. 2.5mm activation시 T-loop위치가 구치부쪽으로 이동할수록 상악 1소구치 발치부위에 응력이 증가하였다. 3.3mm activation시 T-loop위치가 구치부쪽으로 이동할수록 상악 1소구치 발치부위와 상악 1대구치 협측 근심치근 근심면하방 1/2부위에 응력이 증가하였다. 4.1mm activation시 T-loop위치가 견치쪽으로 이동할수록 상악 견치의 근심치근면 상방과 치근첨 하방의 응력이 증가하였다. 5.B/L ratio가 0.25이고 3mm activation시 상악견치의 치체이동이 나타났다. 이상의 결과를 종합해볼 때 segmented T-loop spring의 근,원심 위치와 activation량을 조절하여 원하는 치아이동과 고정원 조절이 가능하다고 사료된다. The segmented TMA T-loop spring, used for reciprocal space closure and described by Burstone, was used to achievebodily movement of canine. Photoelastic analysis is a technique for the transformation of Internal stress into visiblelight patterns. The two-dimensional photoelastic stress analysis was performed, and stress distribution was recorded byphotography. 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 resuts 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 5mm activation, More posterior positioning of T-loop produced an increased stress in upper 1st. premolar extraction site. 3.At 3mm activation, More posterior positioning of T-loop produced an increased stress in upper 1st. premolar extraction site and menial lower half of upper 1st. molar mesio-buccal root. 4.At 1mm activation, More anterior positioning of T-loop produced an increased stress in upper menial and blew apex area of upper canine root. 5.0.25 B/L ratio and 3mm activation produced bodily movement of canine. To summarize, desired tooth movement and anchorage requirement is possible byaltering the activation and mesio-distal position of the T-loop spring.
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.