予測不可能な力制御タスク中の切歯歯の力制御に対する頂部マイクロサージェリーの効果

Effect of Apical Microsurgery on Force Regulation of Incisor Teeth during Unpredictable Force Control Task.

抄録

背景:

アピカルマイクロサージェリー（AMS）は、歯根端の除去を伴うため、歯のフォースコントロールに影響を与える可能性がある。

BACKGROUND: Apical microsurgery (AMS) involves removal of the root-end which can affect the force regulation of teeth.

目的:

歯根端切除術を行った切歯は、歯根端が完全に残っている歯と比較して、予測不可能な力制御課題中の力制御を調査すること。

OBJECTIVE: To investigate the force regulation of incisor teeth treated with AMS during the unpredictable force control task in comparison to their contralateral teeth with complete root apices, in humans.

方法:

15名の参加者（女性8名、男性7名、平均年齢52.9±SD4.4歳）が、AMS治療を行った切歯とその反対側の対照歯（n =30）を用いて、力変換器を引き、保持するという標準的な予測不可能な力制御課題を行った。4つの負荷質量が設定された。100, 200, 50, 300 gmの4つの負荷質量が，紐で力変換器に予測不可能に取り付けられた．得られた力プロファイルは，初期とそれ以降の時間区分に分けられた．初期時間帯のピーク力とピーク力率、後期時間帯の保持力と変動係数を算出し、反復測定分散分析により比較した。

METHODS: Fifteen eligible participants (8 women and 7 men; mean age 52.9 ± SD 4.4 years) performed a standardized unpredictable force control task which involved pulling and holding a force transducer with AMS-treated incisors and its contralateral control teeth (n =30 teeth). A series of four load masses: 100, 200, 50, and 300 gm were attached to the force transducer through a string in an unpredictable manner. The force profile obtained was divided into initial and later time-segments. The peak force and peak force rate during the initial time-segment, and the holding force and coefficient of variability during the later time-segments were calculated and compared by the repeated measures analysis of variance.

結果:

初期時間帯において、AMS投与歯は対照歯に比べ、ピーク力およびピーク力率が有意に低かった（それぞれP = 0.001, P = 0.013）。しかし，その後の時間区間では，AMS処理歯と対照歯との間で，保持力および変動係数に有意差は認められなかった（それぞれ，P = 0.755，P = 0.213）．

RESULTS: During the initial time-segment, the peak force and peak force rate were significantly lower in the AMS-treated teeth than in the controls (P = 0.001, P = 0.013, respectively). However, during the later time-segment, no significant differences in the holding force nor the coefficient of variability were observed between the AMS-treated teeth and their controls (P = 0.755, P = 0.213, respectively).

結論:

AMS を投与した切歯は、正常な根尖を持つ切歯とは対照的に、力の調節に強固な変化を示さない。

CONCLUSION: In contrast to incisors with complete normal root apices, AMS-treated incisors do not show robust changes in force regulation.