Kimio Shimizu

A study on the fit of the base plate —Influence of canditions of storage—

The aims of this study was to define the effect of storage conditions of base plates, which consist of self-curing resin.Examinantions were made on the dimensional accuracy with the passage of time of base plate stored in water and air on a plaster model for standerdized maxillary edentulous. The following conclusions were obtained;1.The fit of base plate stored in water proved to be beter than that stored in air.2.No significant difference was noted among 7 times points.3.In terms of sites of measurement along the base plate, the more posteror the site of measurement, the greater the gap between a base plate and a cast, was observed.4.The best fitting base plate proved to be Ostron II. The second best fitting base plate proved to be Trayresin II.

The Effects of Wearing Laminate Mouth Guard on Body Sway in Upright Posture with the Eyes Closed

目的: 本研究の目的は, ラミネートマウスガードの装着が閉眼時の静的平衡機能に及ぼす影響を明らかにすることである.方法: 被験者は健常有歯顎者11名である. 被験条件は, 閉眼時においてマウスガード非装着での咬頭嵌合位とマウスガードを装着して軽く咬合接触させる2条件とし, 各被験条件での直立姿勢の重心動揺を立位足底圧分布測定装置を用いて計測した. 計測項目は, 重心動揺の左右成分の標準偏差 (XS. D.), 前後成分の標準偏差 (Y-S.D.) および重心移動距離である.被験条件間の統計解析には, Wilcoxon の符号付順位検定を用いた.結果: マウスガード装着, 非装着時でのX-S. D., Y-S. D., 重心移動距離の中央値と四分位範囲は, マウスガード装着時では, 0.19 (0.13), 0.12 (0.10), 9.54 (3.90) cmであり, マウスガード非装着時では, 0.19 (0.11), 0.11 (0.11), 10.19 (4.68) cmであった. 検定の結果, すべての計測項目でマウスガード装着とマウスガード非装着間について有意な差を認めなかった.結論: 以上のことより, ラミネートマウスガードの装着による閉眼時の静的平衡機能への影響を見いだしえなかった.

Study on the Mandibular Rest Position. Changes of Mandibular Position with Tongue Space Narrows.

The purpose of this study was to investigate the effects of tongue space reduction on the mandibular positioning at the mandibular rest position. The three-dimensional positioning of the mandibular incisor tooth point and its variable range were determined at the mandibular rest position using three different tongue space reducing devices. The results were as follows:1. The vertical and anteroposterior components of mandibular positioning range at the mandibular rest position were increased by tongue space reduction.2. The lateral component of mandibular positioning range at the rest position was not significantly affected by hemilateral reduction of the tongue space.