Reproducibility of Border Jaw Movements in Healthy Dentulous Subjects: Analyses of the Back and Forth Width and the Right and Left Width of Border Jaw Movements.:Analyses of the Back Forth Width and the Right and Left Width of Border Jaw Movements
スポンサーリンク
概要
- 論文の詳細を見る
In this study, daily reproducibility of ranges of border jaw movements in healthy dentulous subjects was examined in the short term. We also examined the reproducibility of positions of reference points that determine the standard of coordinates used for a jaw movement-analyzing device and that are thought to be one of factors that influence the daily reproducibility of jaw movements.<BR>‹Methods› The subjects were 5 healthy dentulous people aged 26 to 31 years. Tracings of border jaw movements in sagittal and frontal planes were recorded five times a day using a Gnatho-hexagraph JM-1000 (Ono Sokki Co.) . The recording was repeated for five successive days. The back and forth width of border jaw movements in the sagittal plane (B-F width) and the right and left width in the frontal plane (R-L width) were measured and examined. The reference points for coordinates of Gnatho-hexagraph were the right orbitale and bilateral porions, and the analyzed point was the lower incisal point. To fix these points, dimples made of self-cured resin were set using a Pro-arch face bow.<BR>‹Results› 1. Standard deviations (SD) of coordinates of the incisal points among the five days were 0.48-1.49 mm, and SD of the distances between the right orbitale and the bilateral porions were 0.31 1.55 mm for the five subjects, while SD of coordinates of the reference points and the incisal point on each day for one subject were 0.23-0.38 mm, and those of the incisal point of the subject's cast on an articulator were 0.19-0.42 mm. Therefore, it was thought that the variance among days was mainly due to the gap of each reference point at re-wearing each day.<BR>2. As for variance of R-L width and B-F width within each day, there was a significant difference in R-L widths in one subject within each day. As for variance among the five days, on the other hand, there were significant differences in the B-F widths of one subject and in the R-L widths of four subjects. SD of R-L and B-F widths among the five days ranged from 0.12 to 0.62, tending to be larger than those within each day. However, SD of R-L and B-F widths among the five days were smaller than SD concerning reference points among the five days.<BR>In concluding, it was suggested that R-L and B-F widths in some healthy dentulous subjects could change in the short term, while it became clear that the change is relatively small.
- 日本顎口腔機能学会の論文
日本顎口腔機能学会 | 論文
- 1. 咬合接触と咀嚼機能(第30回学術大会)
- 骨格性下顎前突の外科的矯正治療前後における下顎運動の変化
- 11.骨格性下顎前突症患者における嚥下時筋活動パターンの定量的評価
- 日本顎口腔機能学会第31回学術大会報告
- 5. 顎関節の潤滑メカニズムに関する咬合の影響(第31回学術大会)