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首页> 外文期刊>Journal of Biomechanics >Relevance of mandibular helical axis analysis in functional and dysfunctional TMJs.
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Relevance of mandibular helical axis analysis in functional and dysfunctional TMJs.

机译：下颌螺旋轴分析在功能性和功能障碍性TMJ中的相关性。

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摘要

The helical axis (HA), or motion screw, yields a comprehensive description of joint motion. The perspective representation of this axis clearly visualizes the regularity of mandibular functional movements (Yatabe et al. 1997. Journal of Dentist Research 76, 714-719 and Gallo et al. 2000. Journal of Dental Research 79, 1566-1572). In this study, the sensitivity of the HA representation was investigated relative to (a) irregularities in pathologic motion of clicking temporomandibular joints (TMJs) for jaw opening/closing and (b) differences in food bolus size and consistency for unilateral mastication in subjects with normal TMJs. Mandibular motion relative to the head was acquired using a jaw tracker with six degrees-of-freedom with a sampling frequency of 70Hz. The HA was calculated according to an eigenvalue method (Spoor and Veldpaus 1980. Journal of Biomechanics 13, 391-393) and parameters were defined describing its position and orientation relative to the anatomy. We analyzed 39 subjects with unilateral or bilateral reciprocal TMJ clicking during jaw opening/closing and seven asymptomatic subjects during unilateral mastication of five different types of soft and hard food in two different bolus sizes. The results showed a greater variability of the HA parameters in the group of clicking joints than in the asymptomatic group: in particular, the area in which the HA moved was wider in clicking joints than in normal ones and the HA in clicking TMJs had a much greater fluctuation than in normal ones. During unilateral mastication, for more consistent food or a bigger bolus the HA showed a significantly greater excursion of the orientation parameters. Furthermore a significantly greater excursion of the dorsoventral and of the craniocaudal component of the distance vector from the HA to the condyle were found. The helical axis analysis of mandibular movements was sensitive to kinematic irregularities of the mandible due to an internal joint derangement as well as to differences in food bolus size and consistency.
机译：螺旋轴（HA）或运动螺钉可对关节运动进行全面描述。该轴的透视图清楚地显示了下颌功能运动的规律性（Yatabe等，1997。牙医研究杂志76，714-719和Gallo等2000.牙科研究杂志79，1566-1572）。在这项研究中，针对以下情况调查了HA代表的敏感性：（a）颞下颌clicking节（TMJs）颌部张开/闭合的病理运动不规则;以及（b）单侧咀嚼的食物推注量和一致性的差异。正常的TMJ。使用具有六个自由度的下颌跟踪器获得下颌相对于头部的运动，采样频率为70Hz。根据特征值方法（Spoor和Veldpaus1980。《生物力学杂志》 13，391-393）计算HA，定义参数以描述其相对于解剖结构的位置和方向。我们分析了39名在颌部张开/闭合过程中出现单侧或双侧互逆性TMJ点击的受试者，以及7名无症状受试者，以两种不同的推注量对五种不同类型的软硬食品进行单侧咀嚼。结果表明，与无症状组相比，点击关节组中的HA参数具有更大的可变性：特别是，在点击关节中HA移动的区域比在正常关节中移动的区域更宽，而点击TMJ时HA的区域要大得多。比正常波动更大。在单侧咀嚼期间，对于更一致的食物或更大的推注，HA表现出明显更大的方向参数偏移。此外，发现从HA到the的距离向量的背腹和颅尾成分的偏移明显更大。下颌运动的螺旋轴分析对下颌的运动学不规则性敏感，这是由于内部关节错乱以及食物推注量和一致性的差异所致。

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