No abstract

An easy examination for oral dryness in dental patients is needed. This study suggested that oral dryness can be examined using either an oral moisture checking device or a modified cotton method.

The purpose of this study was to verify the cytotoxicity of a temperature data logger (Thermochron iButton, DS1921G; Maxim, Dallas, TX, USA) and to show the clinical use of such loggers in measuring compliance with oral appliances (OA). In the first experimental study (in vitro cytotoxicity test), we used Testskin (Toyobo, Osaka, Japan) to examine the influence on cytotoxicity caused by use of a temperature data logger (Thermochron) in a human dermal tissue model. The cytotoxicity of extracted fluid in which Thermochron was immersed was calculated and only minimal cytotoxic effects were observed. In the second study, six patients with obstructive sleep apnea-hypopnea syndrome were studied to determine compliance with OA use. Thermochron was attached to the surface of the appliance on the buccal side and was used by the patients. After 1 month, the Thermochron was extracted from the OA and analyzed. Two patients used the OA every day, but one patient used it on only 20% of the recording days. No negative results associated with the use of the Thermochron were reported. The results indicated that temperature data loggers are effective for measuring compliance with the use of OAs.

抄 録 目的：スポーツ時の顎口腔領域の外傷予防には，マウスガードの装着が有効である．本研究は，吸引成形 後のシート各部の厚みについて，色の異なる 2 種のシートを用いて比較検討した． 方法：マウスガードシートに 10 mm 四方の格子を印記し，各格子の厚さをメジャリングディバイス Ⓡ を用 いて測定した．マウスガードシートは白色(MG-W)および紫色(MG-P)のものを用いた．作業用模型 は上顎有歯顎模型をシリコンラバー複製印象材を用いて印象採得後，硬質石膏を注入して作製し，上顎中 切歯切縁で 20 mm，上顎第一大臼歯近心頬側咬頭で 15 mm になるようトリミングしたものを使用した． 加熱条件は，基底面からの垂れ下がり距離が 15 mm のもの(条件 A) ，30 mm のもの(条件 B) ，45 mm のもの(条件 C)の 3 条件とした．2 色のマウスガードシート各部の厚みの違いを t 検定および Wilcoxon 符号付順位和検定を用いて分析を行った． 結果：シートの模型圧接部は，すべての部位で厚みが減少した．前歯部および口蓋部では，すべての加熱 条件において MG-W のほうが MG-P に比較して厚みの変化率が大きかった (p<0.

The aim of this study was to investigate the possible association between sleep bruxism and sleepdisordered breathing. Twenty-six patients who snored (nine women and 17 men) participated in this study. All-night polysomnographic recordings, including masseter electromyography (EMG), were performed in all subjects. The frequency of masseter contraction (MC) episodes was measured. Masseter contraction episodes were classified under the phasic and tonic forms. The analyzed data indicated that the termination of apnea and hypopnea events are often accompanied with tonic MC. It is suggested that tonic MCs can be linked to apnea and hypopnea episodes.