歯及び歯周組織の周波数測定について : ユニットパルス加振と高速フーリエ変換機による解析

スポンサーリンク

概要

• 論文の詳細を見る

• The purpose of this study was to clarify the mechanism of the tooth mobility by measuring the frequency of a tooth and its surrounding tissue. A unit pulse technique was used to vibrate the tooth by hitting it with a hammer with plastic tip. The frequency range from 0 Hz to 5,925Hz was given in a moment to the examined tooth. An accelerated pick up (NP-501s: BBN, U.S.A.) was used for detection of frequency from a tooth and its surrounding tissue. It was adhesived to the palatal surface of a maxillary central incisor. Analysis of data was perfomed by FFT (Fast Fourier Transformer, CF-400; ONO SOKKI Co., Tokyo, Japan). Tooth mobility was measured in visco-elastical model and extracted teeth, and then 41 maxillary central incisors of the patients with healthy periodontal condition and with early to advanced periodontal disease. As the results, two components of frequency were fonud in visco-elastical model and in the patient. One was below 1,000Hz (Peak 1: P. 1) and the another was above 1,000Hz (Peak 2:P. 2). From the result obtained from extracted teeth, the characteristic frequency value of the maxillary central incisor was 2,255. 4Hz, which was average frequency of five teeth. This value was corresponded with the frequency of P. 2. The frequency of P. 1 was caused mainly by vibrating its surrounding tissue. The frequency value of P. 1 and the frequency spectrum of P. 2 were found to relate with the destruction of periodontal tissue. The frequency value of P. 1 decreased according to the progress of periodontal destruction. The frequency spectrum of P. 2 became wider according to the advance of destruction. The shapes of wave of P. 2 was classified into 4 types. There were Bell-type, Voigt-type, Maxwell-type and Mixed Voigt-Maxwell-type. Healthy periodontum showed Bell-type. According to an advance of periodontal disease, the shape of wave of P. 2 change to show a tendency to appear Maxwell-type.

• 特定非営利活動法人日本歯周病学会の論文
• 1982-03-28

著者

• 大倉 博顕

  昭和大学歯学部歯周治療学教室

• 大倉 博顕

  東京医科歯科大学歯学部第2歯科保存学教室

関連論文

• 歯肉炎および辺縁性歯周炎に対するパスター剤「アセスA」の二重盲検法による薬効評価
• 55.歯周外科手術におけるSynthograft^[○!R]の応用(第1報)(第25回 秋季日本歯周病学会)
• A-26.ルートプレーニング時の周波数分析と歯根表面の性状観察
• 30.ルートプレーニング時に生じる擦過音の臨床的分析(第26回 秋季日本歯周病学会)
• 歯周疾患患者における食片圧入について : その頻度・分類・臨床症状との関係
• 歯及び歯周組織の周波数測定について : ユニットパルス加振と高速フーリエ変換機による解析
• 38. FFTアナライザーを用いた歯及び歯周組織の固有振動の測定について : 第2報(一般講演要旨,第24回 秋季日本歯周病学会)
• 最後臼歯遠心面清掃に適した試作ハブラシの歯垢除去効果について
• 26.最後臼歯遠心面清掃に適した試作歯ブラシの歯垢除去効果について(第22回 春季日本歯周病学会)

スポンサーリンク