顎顔面形態がこう合力およびそしゃく筋筋放電活動に及ぼす影響について VI‐2. 上顎,下顎あるいは上下顎両側第一大臼歯歯根膜麻酔におけるこう合力の方向

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タイトル別名
  • The Influence of Craniofacial Form on Bite Force and the EMG Activity of Masticatory Muscles. VI-2. The Direction of Bite Force under Intraligamentary Anesthesia of the Upper, Lower and Upper/Lower First Molar.
  • VI-2. The Direction of Bite Force under Intraligamentary Anesthesia of the Upper, Lower and Upper/Lower First Molar
  • VI-2. 上顎, 下顎あるいは上下顎両側第一大臼歯歯根膜麻酔における咬合力の方向

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In order to determine the effects of craniofacial form and periodontal mechanoreceptors on the direction of bite force, this study classified the bite force during vertical clenching in four steps, namely, the bite forces under no anesthesia, lower-jaw anesthesia, upper-jaw anesthesia and upper/lower-jaw anesthesia. The correlation of direction of bite force with craniofacial form was evaluated. The conclusions were as follows:<BR>1. Comparison of anesthetic environments in each designated range of direction of bite force (θ and θ') The directions of bite force (θ and θ') were similar in both 100% and 75% MC in both the increased and maintained portions regardless of the anesthetic environment. Significant differences (p<0.05) were noted between anesthetic environments in 50% and 25% MC except between no anesthesia and upper anesthesia and between lower anesthesia and upper/lower anesthesia.<BR>2. Correlation of 11 measured items on craniofacial form and the direction of bite force<BR>For no anesthesia and upper anesthesia, significant correlations were found in Ar-Go-Me and AG-KR for θ, and Ar-Go-Me, MM-OP, SN-OP, MP-OP, CC⊥AG-KR and CC⊥F for θ' in each of the designated ranges.<BR>For lower anesthesia and upper/lower anesthesia, significant correlations were found with no anesthesia in θ and θ'. Further, a significant positive correlation was found in 50% and 25% MC in MM-OP for θ.

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