College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing, China.
Jiangsu Key Laboratory of Oral Diseases, Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
PLoS One. 2020 Jul 13;15(7):e0235822. doi: 10.1371/journal.pone.0235822. eCollection 2020.
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.
关于人牙周韧带在动态压缩下的力学性能的研究很少。本研究旨在确定人牙周韧带在动态压缩载荷下的粘弹性特性。使用动态力学分析，选择 0.05 Hz 至 5 Hz 之间的频率，压缩幅度为牙周韧带初始宽度的 2%，对 10 个人中切牙标本进行了频率扫描测试。压缩应变范围为牙周韧带初始宽度的 4%至 8%。储存模量在 28.61 MPa 至 250.21 MPa 之间变化，随着频率的增加而增加。损耗模量（6.00 MPa 至 49.28 MPa）也随着频率从 0.05 Hz 增加到 0.5 Hz 而增加，但当频率高于 0.5 Hz 时保持不变。损耗角正切值与频率呈负对数相关。中切牙的动态模量和损耗角正切值高于侧切牙。本研究得出结论，人牙周韧带在使用频率范围内（0.05 Hz-5 Hz）表现出粘弹性行为。牙齿位置和测试频率可能会对牙周韧带的粘弹性产生影响。
