Hernández I A, Fyfe K R, Heo G, Major P W
Department of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada.
J Oral Rehabil. 2006 Aug;33(8):566-75. doi: 10.1111/j.1365-2842.2005.01555.x.
Rear-end-impact motor vehicle accidents may result in cervical and temporomandibular-related pain complaints. Head kimematics in simulated low-impact rear-end impacts have been investigated but mandibular kinematics have not been described. Thirty healthy adult subjects underwent three impacts (4.5 m s(-2) expected, 10.0 m s(-2) unexpected, and 10.0 m s(-2) expected). Onset time and peak magnitude of angular head acceleration, angular mandibular acceleration and angular mandibular displacement were measured. Significant mandibular opening acceleration was not identified with rearward head rotation. The peak magnitude of mandibular closing angular acceleration approximately doubled with increased impact magnitude. No differences in peak angular mandibular acceleration regarding expectation were identified. Gender differences were detected in the fast unexpected impact. The peak time for the angular mandibular acceleration (mandibular closure) was approximately 84-120 ms later than peak rearward angular head acceleration for all impacts. Onset and peak times for angular mandibular acceleration (mandibular closure) were similar to the onset and peak times for forward head acceleration. There was also a positive correlation between the magnitude of the forward angular acceleration of the head and angular acceleration of the mandible for the slow (0.65, P = 0.015) and fast expected (0.844, P = 0.001) impacts. The average angular mandibular angular displacement (mandibular closure) was approximately 6 degrees . The hyperextension hypothesis regarding mechanism of temporomandibular joint injury in low-impact rear-end collisions cannot be supported.
机动车追尾事故可能导致颈部和颞下颌关节相关的疼痛主诉。人们已经对模拟低强度追尾碰撞中的头部运动学进行了研究，但下颌运动学尚未得到描述。30名健康成年受试者接受了三次碰撞（预期4.5米/秒²、意外10.0米/秒²和预期10.0米/秒²）。测量了头部角加速度、下颌角加速度和下颌角位移的起始时间和峰值大小。头部向后旋转时未发现明显的下颌张开加速度。随着碰撞强度增加，下颌闭合角加速度的峰值大小大约增加了一倍。未发现预期方面下颌角加速度峰值的差异。在快速意外碰撞中检测到性别差异。所有碰撞中，下颌角加速度（下颌闭合）的峰值时间比头部向后角加速度峰值晚约84 - 120毫秒。下颌角加速度（下颌闭合）的起始时间和峰值时间与头部向前加速度的起始时间和峰值时间相似。对于慢速（0.65，P = 0.015）和快速预期（0.844，P = 0.001）碰撞，头部向前角加速度大小与下颌角加速度之间也存在正相关。下颌角平均角位移（下颌闭合）约为6度。关于低强度追尾碰撞中颞下颌关节损伤机制的过伸假说无法得到支持。
