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정상교합자의 Ⅲ급 부정교합자의 저작근 근전도에 관한 연구
박영국,이기수,주보훈 대한치과교정학회 1991 대한치과교정학회지 Vol.21 No.1
The purpose of the present study was to investigate the differences of EMG activity of the masticatory muscles between normal occlusion and Class Ⅲ malocclusion during various jaw functions. 46 subjects of 18.4-25.7 years were employed in this study: 26 subjects were normal occlusions, and 20 subjects were Class Ⅲ malocclusions. The EMG data from the anterior and posterior temporal, anterior and posterior masseter muscles in both sides as mandibular elevators and supra-hyoid muscle group(close to the anterior belly of digastric muscle in right side) as mandibular depressor were recorded with the Medelec MS 25 electromyographic machine. The EMG recordings were analyzed during mandibular rest position, maximal biting, mastication with chewing gum, and swallowing of peanuts. All data were recorded and statistically processed. 1.The maximal mean amplitude of the anterior temporal muscle was stronger significantly in Class Ⅲ malocclusion than in normal occlusion, and then the posterior temporal was weaker during mandibular rest position. 2.The maximal mean amplitudes in the anterior and posterior temporal muscles and the anterior masseter muscle of Class Ⅲ malocclusion was weaker significantly than that of normal occlusion during maximal biting. 3.During mastication of the chewing gum, the maximal mean amplitudes of Class Ⅲ malocclusion was weaker significantly than normal occlusion in the anterior and posterior temporal muscles of the working side, and the duration of Class Ⅲ malocclusion was longer in the anterior temporal muscles of both sides and the posterior temporal and the anterior masseter muscle of the balancing side. There were significant increasings of the latency in balancing anterior temporal, working posterior temporal muscles and supra-hyoid muscle group of Class Ⅲ malocclusion. The silent period durations was 16.36 ms in Class Ⅲ malocclusion while 10.76 ms in normal occlusion, which was statistically different(P<0.05). 4.At swallowing of peanuts, the maximal mean amplitude of Class malocclusion was weaker significantly in the posterior temporal muscle than that of normal occlusion. There was no significant difference of duration between normal occlusion and Class Ⅲ malocclusion. 5.The muscle activities of Class Ⅲ malocclusion had a tendency of decrease less than normal occlusion. And then the muscle activities of the anterior temporal and anterior masseter muscles in Class Ⅲ malocclusion showed the tendency of the increase more than other muscles of Class Ⅲ malocclusion.
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주보훈(Bo-Hoon Joo),이기수(Ki-Soo Lee) 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.1
부정교합의 평가는 질적, 양적인 면에서 모두 평가되어야 한다. 이는 부정교합의 경중도의 평가뿐만 아니라 이의 치료가 얼마나 어려운가를 반영할 수 있는 치료의 난이도로 발전되어야 한다. 이러한 부정교합의 경중도와 치료의 난이도를 객관적이고 효율적으로 측정하기 위한 방법의 개발이 필요하다. 이는 치과 교정학에서 치료의 효과 및 효율의 평가에서 치료난이도를 반영하는 부정교합 경중도 측정을 가능하게 하여 교정치료의 양적 그리고 질적 평가를 가능하게 할 것이다. 본 연구는 부정교합의 객관적 정량분석을 위한 연구로써 객관적 부정교합의 경중도와 주관적 치료 난이도를 측정하고 이들간의 상관관계를 연구하고자 하였다. 이를 위하여, 100쌍의 교정용 치아모형을 이용하여 경험있는 8명의 치과교정의가 주관적인 치료의 난이도를 평가하기 위하여 치료의 어려움과 예상치료기간을 추정하였으며 객관적인 부정교합의 경중도를 측정하기 위하여 저자는 동료평가등급 지수 (PAR index) 를 사용하여 각 부정교합의 구성요소 별 경중도를 계측하였다. 이들간의 상관관계의 조사에서 객관적으로 계측한 부정교합의 경중도와 평가단의 치료 예상난이도 사이에는 유의한 관련성이 있었으며. 특히 상악 전치부 배열, 구치부교합, 수평피개도, 수직피개도, 그리고 정중선 일치도에서 높은 상관성을 보였다. 본 연구를 통하여 객관적으로 계측된 부정교합의 경중도가 치과 교정의사가 느끼는 주관적 치료 난이도에 미치는 영향을 조사할 수 있으며. 이는 치료의 주관적 난이도를 내포하는 새로운 국내형 교합지수개발에 도움이 될 것으로 사료된다. The evaluation of malocclusion has to be done quantitatively and qualitatively. This will be lead toward an analysis of malocclusion severity as well as treatment difficulty, The method of proper evaluation of malocclusion severity and treatment difficulty is necessary to assess treatment effect and efficiency for the orthodontists and to establish fundamentals for planning and executing the health-related policies in private and public institutions. The purposes of this study as the first part of the objective and quantitative analysis of malocclusion were 1) to measure treatment difficulty based on the opinions of several orthodontists, and 2) to investigate the relationships between objective malocclusion severity and subjective treatment difficulty. 100 pairs of dental casts that had various types and severity of malocclusion were selected from the orthodontic departments of Kyunghee University and Samsung Medical Center. The objective malocclusion severity was measured with the PAR (Peer Assessment Rating) index and the subjective treatment difficulty was evaluated by 8 experienced orthodontists. The relationships between objective malocclusion severity and subjective treatment difficulty were statistically evaluated. There were significant relationships between objective malocclusion severity and subjective treatment difficulty, especially in the measurements of the upper anterior alignment, the buccal occlusion, the overjet, the overbite and the midline discrepancy inthe malocclusion components. The results of this study can provide the background knowledge to develop a new occlusal index, which contains both the malocclusion severity and treatment difficulty for Korean orthodontists.
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