咬合高径が聴覚路に及ぼす影響

• 町山 由花

  日本大学大学院松戸歯学研究科

• 松本 敏彦

  日本大学松戸歯学部顎咬合機能治療学講座

書誌事項

タイトル別名

• Influence of Vertical Changes on Jaw Position to Auditory Pathway

抄録

This study was examined the functional change in the auditory pathway caused by increased jaw vertical position at upper and at lower point of the free-way-space. Then, we investigated the mechanism of response in auditory pathway accompanying with increasing of vertical dimension, focusing on the outer-hair-cells-activities in cochlear, between jaw closed position (V₀) and 3.0 mm vertical increased (V₃) and 5.0 mm vertical increased (V₅) which were standardized on articulator, each vertical dimensions on articulator were calculated at incisor point showed 2.30 mm ±0.19 in range of V₀ to V₃, 3.68 mm ±0.30 mm in range of V₀ to V₅, distance of V₀ to V₃ was located in the range of free-way-space, and also distance of V₀ to V₅ was over the free-way-space but was in the range of terminal-hinge-movement. At these three vertical positions, that were at V₀ and at V₃ and at V₅, neuro-otological examinations were done as follows: (1) Activities of the outer-hair-cells in cochlear were evaluated by DPOAE-gram (threshold level of distortion-product otoacoustic emission) using GSI-60 system (Grason-Stadler Co.) in the frequency wave band from f₁1250 Hz 5031 Hz. (2) And responses on stapedial muscle were examined with SR (by acoustic-stimuli) using GSI-33 middle ear analyzer (Grason-Stadler Co.), it proves as threshold level and latency L₁. (3) The changes of middle ear compliance were measured on tympanogram using impedance meter SI-501 (Morita Co.), it proves as the static compliance in tympanic membrane (STC), peak pressure (PRS) and volume (EAC) in middle ear cavity. Those data were gathered from eleven healthy dentulous persons (male, average 24.5 years old, 22 ears), and were analyzed by Wilcoxon's ranks test for comparing with values at position V₀.<BR>We obtained the following results, the differences of values between V₀ and V₃ and also between V₀ and V₅ are significantly noted as follows: (1) STC was increasing significantly with jaw opening and showed the difference between V₀ and V₃, between V₀ and V₅ noted. (2) DPOAE value was also increased and showed significantly difference between V₀ and V₃, between V₀ and V₅, it was limited frequency at the band in f₁ 5031 Hz, it suggests that threshold range in outer-hair-cells located at nearest basement in cochlear. (3) However any difference of values in PRS, in EAC, in threshold value, and in latency L₁ weren't noted.<BR>A worthy finding is the changes of DPOAE at band in f₁5031 Hz, which means that the increase of vertical dimension stimulates trigeminal ganglion that sends projections to tympanic nerve, at the same time, the outer-hair-cells on cochlear basement, without any functional derangement in crossed olivo-cochlear bundle.

収録刊行物

• 日本顎口腔機能学会雑誌

  日本顎口腔機能学会雑誌 14 (2), 82-88, 2008

  日本顎口腔機能学会

キーワード

• 咬合高径
• 静的コンプライアンス
• 歪成分耳音響放射

詳細情報

• CRID: 1390001204352310272
• NII論文ID: 130004010433
• NII論文ID: 110006666071
• NII書誌ID: AN1047134X
• DOI: 10.7144/sgf.14.82
• ISSN: 1883986X
• ISSN: 13409085
• Web Site: https://search.jamas.or.jp/link/ui/2008295560
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可