선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The purpose of this study was to evaluate the effects of oral habits on the muscles of mastication and facial expression by means of two parameters: muscle stiffness and elasticity.
- To minimize the influence on muscle condition to be evaluated, the exclusion criteria included followings; those with malocclusion including bimaxillary protrusion, anterior open bite and anterior deep bite, TMD, missing teeth (except wisdom teeth) or extensive bridge-work (≥ 3-unit bridge-work), and serious dental caries and periodontal diseases.
- Oral habits experimentally performed were clenching, jaw thrust and lip bracing habits. In order to maintain a constant clenching force exerted during measuring the muscles, all the subjects were asked to clench with a force of 50 kg while clenching a bite force recorder placed on between the first molars on their preferred sides, which was defined as unilateral clenching in this study. The bite force recorder used had biting portion with a width of 20 mm and a thickness of 4 mm.
- The distance moved by the sensor probefor each muscle was determined separately in regards with the thickness of muscle and relation with adjacent structures; 8 mm for Mm and Zm, 5 mm for OOrs and OOri, and 3 mm for the rest. The examinations were performed bilaterally for each muscle. Fig 2-1 and 2-2 shows hysteresis curves from the muscle measurement with the tactile sensor.
- Each measurement per muscle was performed two times and their average values were collected for data analyses. An interval of 3 min was given for each examination and rest period of 30 min was also given before performing each oral habit in order to minimize muscle tiredness.
- A hysteresis curve composed of two parts, which are formed when the sensor pushes down(bottom) and then retracts(top),6) was obtained through each examination against the two masticatory and six different facial expression muscles while oral habit was performing (Fig 2-1,2). The slope of the tangent of the hysteresis curve (∆f/∆x) is defined as stiffness of the muscle being measured and the distance between the two parts as its elasticity.
- To the best of our knowledge, as there existed very few studies concerning a relation of oral habit with facial expression muscles, this study aimed to investigate effects of oral habits on the facial expression muscles as well as the masticatory muscles using two parameters of muscle stiffness and elasticity with a tactile sensor.
- There were several methodological aspects to be concerned in this study. The first problem was to identify the facial expression muscles to be measured. Previous studies on facial musculature with EMG8,25) demonstrated the high inter- and intra-individual variability in location and morphology of the individual muscles, as well as in the overlying soft tissue.
- 8,26) In this regard, it is thought that the tactile sensor will be a simple and easy way to evaluate the specific facial muscle in clinical setting. Specific measuring sites for facial expression muscles tested in this study were determined based on the anatomical knowledge from textbook and previous EMG studies. To lessen individual's variability, all the subjects in this study were selected from healthy young male in their twenties.
대상 데이터
- 10 healthy, fully-dentate men in their twenties (mean age of 23.4±2.0 years) were voluntarily selected for this study.
- To lessen individual's variability, all the subjects in this study were selected from healthy young male in their twenties.
데이터처리
- The values indicating stiffness and elasticity of each muscle in varied oral condition was obtained from its hysteresis curve and their mean values from the two examinations were compared. The values obtained from unilateral clenching were compared between the clenching and non-clenching sides of the jaw by paired t-tests and their correlation coefficients were investigated. One-way ANOVA was also used to determine the influence of oral habits on the masticatory and facial muscles.
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