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.
가설 설정
- 1. Muscle fatigue was first felt after opening the jaw. The time of muscle pain was fastest after clenching.
- 3. There was no change found in the muscle where experimental muscle fatigue was induced.
제안 방법
- So as to induce experimental muscle fatigue, a number of methods have employed: temperature, electric stimulation, exercise, ischemia, injection of hypertonic saline. This study employed overly long minutes of opening the jaw, gum chewing, tooth clenching and induced muscle fatigue.
- In this research, in order to evaluate the changes on occlusal state caused by muscle weakness, and malfunction of masticatory muscle at the points of muscle pain, T-scan was used and then recorded the number of contact and contact force. T-scan is useful to observe in real time at the moment of occlusion in a computer screen and makes a kinetic evaluation and is highly reproducible.
- To begin with this research, all the subjects were tested to fit in this study: TMD charting sheet was recorded for an evaluation of clinical symptoms like joint pain, joint sound, mouth opening limitation. Among them, 24 subjects with no TMJ symptoms were finally selected.
- Subjects were heard to keep the record of muscle fatigue in every minute using 10 cm visual analog scale (VAS) and mark the level of pain when they detected first pain.
- On the other hand, in this study subjects were told to open their jaw wide enough 3 fingers to stick in and stay until mouth started to get closer, and to chew gum in preferred side so as to step up to muscle fatigue status. As far as gum chewing is concerned, subjects chewed with either side of teeth and made the gum more smoothly enough.
- In order to minimize interaction in each experiment, subjects were given enough break and applied tooth clenching, opening the jaw and chewing gum in one side in random. Subjects were told to keep the record of muscle fatigue in every minute using 10 cm visual analog scale (VAS) and mark the level of pain when they detected first pain.
- Previous scholars mentioned above usually electomyogram to study muscle state during experimental muscle fatigue produced. Due to not enough researches on occlusal changes during muscle fatigue or muscle pain, this study used T-scan II system to access muscle weakness that patients felt muscle fatigue and analyzed contact factors like the number of contact points and contact force on first contact point, intercuspal position, maximum contact point, and end contact point and then observed its relevance.
- In this study, in order to assess the level of muscle weakness subjects felt during muscle fatigue, it was categorized into contact time, contact force, %contact force, and was measured and analyzed. As a result, contact time, contact force, and %contact force on the first contact point did not show significant difference, but after each event on intercuspal position contact point, contact force meaningfully decreased after opening the jaw for a long time (Table 2,3).
- , USA) recorded occlusal contact points before subjects induced experimental muscle fatigue and after they induced the fatigue after clenching, opening the jaw for several minutes and chewing gum with the preferred side. Following categories were researched: the time of first contact, force of first contact, %contact force and the time of maximum contact, the force level exerted on that tooth during occlusion, %contact force, time and force of maximum contact point, %contact force, the time of end contact point. Here are results.
대상 데이터
- Among non-patient volunteers and patient volunteers who visited Wonkwang University Dentistry Hospital, 24 subjects(average age of 25.7)were selected. They had not TMD symptoms and normal range of occlusion.
- In order to evaluate occlusal patterns on how muscle fatigue from excessive tooth clenching, jaw opening and gum chewing affect, and whether changes in sensory nerve influence muscle pain, 24 subjects at the average age of 25.7 participated in this research. They were non-TMD patients, and had ordinary occlussion.
성능/효과
- There were not much significant difference between the number of contact on first contact point and on maximum contact point from first contact, and the contact number in left side declined significantly after chewing gum on intercuspal position(P=0.001 P<0.01), and contact number on both sides showed significant decreases after opening the jaw for a long time and chewing gum(Table 7,8).
- In this study VAS recorded pain after chewing gum was 3.46±1.96, which was lower than VAS after clenching and long minutes of opening the jaw.
- Muscle fatigue caused by low level of clenching, headache, and similar symptom realized in positive, in VAS research. Male subjects were recorded significantly high, and in this study when subjects clenched their teeth, muscle fatigue was marked high VAS. In active electromyogram, female marked high on masticatory muscle, and when experimental muscle pain was induced by injection of glutamate, there were no difference between male and female.
- 2. There were not much difference on contact force at the first contact time, but contact time decreased after chewing gum, and contact force also dropped after long minutes of jaw opening and gum chewing on intercuspal position contact point. Contact force decreased after a long time of opening the jaw and after chewing gum.
- In conclusion, a series of events in and out of oral cavity proved that when patients claim experimental muscle weakness, it causes damages on the occlusal pattern. These events that long minute of jaw opening, clenching, excessive chewing, can affect on bad oral system confirmed that especially during dental treatment dentists should be careful with the occlusal changes.
후속연구
- In this view, further study should be pursued in that right side chewing group has less contact number on right side, while left side chewing group has no difference between left and right side. Following research on the occlusal pattern was not accompanied after experimental muscle fatigue was rehabilitated, and on this, the evaluation on occlusal pattern of acute and chronic muscle disorder is unsatisfactory so that further study should be done. There is high probability that pain caused in masticatory muscle is usually protective muscle splinting that first appears in masticatory muscle disorder when patients move the muscle, they claim pain increasing and jaw problem, but it does not accompany structural changes in muscle.
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