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KMID : 0386219970090020040
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Journal of Korean Academy of Craniomandibular Disorders
1997 Volume.9 No. 2 p.40 ~ p.49
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EFFECTS OF THE HEAD POSTURES AND THE CHEWING SIDE PREFERENCE ON THE TOOTH CONTACT PATTERN
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김병욱/Kim, Byung-Wook
이창규/한경수/Lee, Chang-Kyu/Han, Kyung-Soo
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Abstract
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This study was performed to investigate the effects of change of the head posture and of the chewing side preference on the tooth contact pattern. For the study, the author randomly selected 44 dental students without any signs and symptoms of temporomandibular disorders. The head postures taken in this study were 4 postures : natural head posture(NHP), upward head posture(UHP), downward head posture(DHP), and forward head posture(FHP). Each head posture except natural head posture was observed in two postures by angle of head inclination, 10 and 20 degree, respectively. Electronic occlusal contact analyser, T-Scan(Tekscan Co., USA), was used to record tooth contact pattern related to contact number, force, duration, and total left-right statistics (TLR) which was occlusal unbalance between left and right dental arch on clenching. Difference of value between in preferred chewing side and in contralateral chewing side in same head posture and differences by head postures were analyzed.
The results obtained were as follows :
1. Mean value of contact number and force in natural head posture were the highest and the difference between the postures by head inclination in each head posture except in natural head posture was significant in general.
2. Mean value of contact number and force in upward head posture and in downward head posture were higher in 20 degree head inclination than in 10 degree head inclination, and the score of the occlusal unbalance between left and right dental arch(TLR) on clenching was lowered in 20 degree whereas the pattern in forward head posture showed reverse tendency.
3. Contact duration in natural head posture was the longest, and there was no difference in duration between in 10 and in 20 degree head inclination in other postures.
4. In unilateral chewing subjects, contact number and force were always higher in left side without regard to preferred chewing side.
5. Correlation in contact number and in force between head postures were highly significant, but correlation between items of contact pattern was shown between number and force only.
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