Komatsu K, Chiba M
Department of Pharmacology, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Arch Oral Biol. 1993 May;38(5):369-75. doi: 10.1016/0003-9969(93)90207-3.
Stress-strain relations of this ligament in transverse sections of the mandibular first molar were examined over a wide range of velocities of loading from 1 to 10(4) mm/24 h. With increasing velocities, the maximum shear stress, tangent modulus and failure strain-energy density increased but the maximum shear strain decreased. The mechanical responses at the highest velocity for the molar ligament were compared with those previously found for the incisor ligament. Mechanical strength, stiffness and toughness were greater for the molar than for the incisor ligament; the molar ligament therefore has more extensible fibres or a different fibre arrangement. Comparison of the mechanical responses at the slowest velocity suggests that, though the stress level was greatly reduced (presumably because of stress relaxation), the fibre components of the molar ligament still reacted at this velocity. It is also suggested that the differences in the ratios of the mechanical measures in 10(4)-1 mm/24 h between the two types of teeth are due partly to their different periodontal fibre architectures.
在下颌第一磨牙的横切面上，研究了该韧带在1至10⁴毫米/24小时的广泛加载速度范围内的应力-应变关系。随着速度的增加，最大剪应力、切线模量和破坏应变能密度增加，但最大剪应变减小。将磨牙韧带在最高速度下的力学响应与先前在切牙韧带中发现的响应进行了比较。磨牙韧带的机械强度、刚度和韧性均高于切牙韧带；因此，磨牙韧带具有更多可伸展的纤维或不同的纤维排列。在最慢速度下的力学响应比较表明，尽管应力水平大幅降低（可能是由于应力松弛），磨牙韧带的纤维成分在该速度下仍有反应。还表明，两种牙齿在10⁴-1毫米/24小时内力学测量值的比率差异部分归因于它们不同的牙周纤维结构。
