下顎側方移動による蝸牛の機能変化

DOI 被引用文献1件 参考文献31件
  • 竹村 雅宏
    日本大学大学院松戸歯学研究科局部床義歯学専攻
  • 松本 敏彦
    日本大学松戸歯学部歯科補綴学第三講座

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タイトル別名
  • Changes of cochlear function stemming from jaw side shift

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This study was conducted to investigate the functional change of auditory path way stemming from jaw position. Therefore, we measured tympanogram and distortion product otoacoustic emission in closed position and canine apical position (lateral position) of 11 healthy subjects, and reviewed a functional change of auditory pathway by mandibular lateral move.<BR>1. The incisal point moved 0.8 (1.1) mm in sagittal direction (X), 3.8 (0.9) mm in lateral direction (Y), 2.8 (1.3) mm in vertical direction (Z) . In the condyle point, working side (WS) moves 0.2 (0.3) mm in front direction, 0.3 (0.3) mm in outside direction, 0.3 (0.5) mm in a downward course. The inclination of sagittal condyle path was 23.7 (59.3) °, lateral condyle path was -4.7 (63.1) °. The non-working side (NWS) moved 2.9 (1.2) mm in front direction, 0.5 (0.4) mm in an inside direction, 3.3 (1.3) mm in a downward course. The inclination of sagittal condyle path was 49.6 (6.8) °, lateral condyle path was 9.6 (7.0) °.<BR>2. In tympanogram, WS showed significant decline in IMP, but the difference was not recognized in PRS and EAC. The difference was recognized in neither in NWS for this.<BR>3. A DP level of lateral position showed significant degradation at 2000Hz and elevation at 5031Hz in WS. On the other hand, it recognized a significant rise at 1250Hz and 5031Hz, degradation at 2000Hz in NWS. The change was not accepted with other frequency.<BR>4. Correlation with quantity of displacement to lateral position and quantity of DP level change is accepted. In incisal point, positive correlation was accepted between Z and 1250Hz, between Y and 2000Hz, negative correlation was accepted between Z and 2531Hz, 5031Hz in WS. However, the significance was not recognized in all measured value in NWS. At condyle point, positive correlation was accepted between inclination of lateral condyle path and 2531Hz in WS, but the reference was recognized in neither between other measured value.<BR>From these results, it was suggested that mandibular position had an influence on auditory pathway, the change on auditory pathway was recognized in the response threshold of a DP level.

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