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動的圧縮荷重下におけるヒト切歯歯根膜の粘弾性特性の周波数依存性
Frequency-related viscoelastic properties of the human incisor periodontal ligament under dynamic compressive loading.
PMID: 32658896 DOI: 10.1371/journal.pone.0235822.
抄録
動的圧縮荷重下におけるヒト歯根膜の力学的特性に関する研究は稀である．本研究では，動的圧縮荷重下におけるヒト歯根膜の粘弾性特性を明らかにすることを目的とした．上顎中切歯5本と上顎側切歯5本を含む10本のヒト切歯標本を用いて動的力学解析を行った．周波数掃引試験は，0.05Hzから5Hzの間の選択された周波数で，PDLの初期幅の2%の圧縮振幅で実施した．圧縮ひずみはPDLの初期幅の4%から8%の範囲で変化した。貯蔵弾性率は，28.61MPaから250.21MPaの範囲で，周波数の増加とともに増加した．損失弾性率(6.00MPaから49.28MPaまで)も0.05Hzから0.5Hzまでは周波数とともに増加したが、0.5Hzより高い周波数では一定であった。また，tanδは周波数に対して負の対数相関を示した。また，中切歯の動弾性率と損失正接は側切歯の動弾性率よりも高かった．本研究では，使用周波数0.05Hz-5Hzの範囲内で圧縮荷重を加えた場合，ヒトPDLは粘弾性を示すと結論づけた．歯の位置や試験周波数がPDLの粘弾性特性に影響を与えている可能性がある．
Studies concerning the mechanical properties of the human periodontal ligament under dynamic compression are rare. This study aimed to determine the viscoelastic properties of the human periodontal ligament under dynamic compressive loading. Ten human incisor specimens containing 5 maxillary central incisors and 5 maxillary lateral incisors were used in a dynamic mechanical analysis. Frequency sweep tests were performed under the selected frequencies between 0.05 Hz and 5 Hz with a compression amplitude that was 2% of the PDL's initial width. The compressive strain varied over a range of 4%-8% of the PDL's initial width. The storage modulus, ranging from 28.61 MPa to 250.21 MPa, increased with the increase in frequency. The loss modulus (from 6.00 MPa to 49.28 MPa) also increased with frequency from 0.05 Hz- 0.5 Hz but remained constant when the frequency was higher than 0.5 Hz. The tanδ showed a negative logarithmic correlation with frequency. The dynamic moduli and the loss tangent of the central incisor were higher than those of the lateral incisor. This study concluded that the human PDL exhibits viscoelastic behavior under compressive loadings within the range of the used frequency, 0.05 Hz- 5 Hz. The tooth position and testing frequency may have effects on the viscoelastic properties of PDL.