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성장기 II급 부정교합 환아의 기능성 악교정 장치의 치료 효과에 관한 연구
강힘찬,이고은,김미선,남옥형,이효설,김광철,최성철 대한소아치과학회 2020 大韓小兒齒科學會誌 Vol.47 No.3
The purpose of this study was to evaluate the skeletal and dentoalveolar effects and optimal timing for treatment of class II malocclusion with functional appliances in children and adolescents. A group of 30 patients with class II malocclusion were divided into 3 groups according to their use of functional appliance: Twin block, Activator, Fränkel appliance. The group was also divided into 2 groups according to the cervical vertebrae maturation method. Lateral cephalometric radiographs were analyzed pretreatment (T0) and posttreatment (T1). Among the functional appliances, treatment with Twin block and Activator showed significant increase in the length of the mandible (Co-Gn) and the lower anterior facial height (ANS to Me), whereas the overjet and overbite were significantly reduced. Treatment with Fränkel appliance showed significant improvement in the relationship of maxilla and mandible. In addition, if the functional appliance was used during the period of pubertal growth peak, there was a significant increase in mandibular length, improvement in the relationship of maxilla and mandible, labial inclination of lower incisors and decrease in overjet compared to the treatment before pubertal growth peak. Therefore, this study indicates that using functional appliances for patients with class II malocclusion is effective and the optimal timing for using functional appliances is during pubertal growth peak. 이 연구의 목적은 소아청소년에서의 2급 부정교합 치료에 사용되는 기능성 악교정 장치의 효과 및 치료 시기에 따른 효과를 평가하고자 하였다. 경희대학교 소아치과에 내원한 2급 부정교합환자 30명을 대상으로 하였으며 치료에 사용된 기능성 악교정 장치에 따라군을 나누었다. 치료 시기에 따른 비교를 위하여 경추골 성숙도 방법을 이용하여 2개의 군으로 나누어졌다. 각 실험군은 치료 전(T0)과치료 후(T1)의 측모두부방사선사진을 비교 분석하였다. 기능성 악교정 장치 중, Twin block과 Activator는 하악골의 길이(Co-Gn)와 하안모의 길이(ANS to Me)의 유의한 증가를 보였으며, overjet과 overbite의 유의한 감소를 보였다. 반면 Fränkel appliance를 이용한 환자에서는 상하악 간의 관계 및 overjet의 유의한 개선을 보였다. 최대성장기에 기능성 악교정 장치를 사용하였을 때 최대성장기 전에 사용한 것에 비하여 유의한 하악 길이의 증가, 상악과하악간의 관계 개선, overjet의 감소, 하악 중절치의 순측 경사의 증가를 보였다. 이 연구를 통하여 2급 부정교합을 가진 소아청소년에서 기능성 악교정 장치의 효과를 검증하였으며, 최대성장기에 치료를 시행하는 것이 더 효과적인 것을 확인하였다.
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가부키 증후군(Kabuki syndrome) 환자의 치과적 관리의 치험례
강힘찬(Him Chan Kang),남옥형(Ok Hyung Nam),김미선(Mi Sun Kim),최성철(Sung Chul Choi),김광철(Kwang Chul Kim),이효설(Hyo-Seol Lee) Asia association of Disability and Oral health 2017 International Journal of Disability and Oral Healt Vol.13 No.2
Kabuki syndrome is characterized by typical facial features (elongated palpebral fissures with eversion of the lateral third of the lower eyelid; arched and broad eyebrows; short columella with depressed nasal tip; large, prominent, or cupped ears), minor skeletal anomalies, persistence of fetal fingertip pads, mild to moderate intellectual disability, and postnatal growth deficiency. A 6-year-old male with kabuki syndrome was referred from the local dental clinic for left facial swelling and dental caries on all primary molars. He was treated for acute periapical abscess with incision and drainage under physical restraint, and left maxillary second primary molar was extracted. Other caries treatment was performed under general anesthesia. As the syndrome involves many different medical problems, special cares should be considered. Dental treatment should be carried out in comprehensive consultation system.
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권재경,김정현,이선영,강힘찬 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
For producing wood plastic composites (WPCs) having lightweight and cost efficiency, a microcellular injection foaming process is applied in our present work. Two types of exothermic foaming agents (EFA) with different range of particle size are used for formation of microcellular structure in WPCs. This research examines effects of particle size and concentration of the exothermic foaming agents on mechanical and physical properties of WPCs. The average cell size in WPCs is decreased with increasing the content of exothermic foaming agents. The large foaming agent shows small cell size compared to the small foaming agent case. Cell population density of foamed WPCs increases with increasing the EFA content, but decreases with decreasing the size of EFA. Concerning density and void fraction of foamed WPCs, the density is reduced but the void fraction is increased with increasing the EFA concentration. For the flexural strength, increment of amount of EFA decreases the mechanical strength because of the increase of cell density and void fraction. Also, the smaller size foaming agent (an AC9000 case) increases more strength due to influence of EFA size.
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