Mechanics in head and neck reconstruction

当在面部重建中使用钛植入物附着面部假体和/或骨锚定助听器时，重要的是它们与底层骨骼保持牢固的连接。目前的医学成像技术无法诊断这种骨-植入物界面的变化，因此必须使用其他手段来确定这些植入物的健康状况。目前正在开发一种机械冲击技术，在这种技术中，使用一个小的仪器杆来监测植入物撞击过程中产生的加速度。植入系统的数学模型正在开发中，以帮助解释影响的结果，而临床试验正在进行中，以评估该技术的有效性。在正畸治疗过程中，正畸医生对牙齿施加连续的力系统，使牙齿与牙弓永久地重新定位，以改善咬合。尽管多年的实践和研究，一个清楚的认识之间的联系的力水平和相关的速度的牙齿运动尚未实现。目前正在开展对照临床试验，以帮助解决这一重要问题。CT扫描将用于监测牙齿位置的变化，同时仔细检查施加的力系统及其对牙齿支撑结构的影响。

When titanium implants are used to attached facial prosthesis and/or bone anchored hearing aids during facial reconstruction it is important that they maintain a solid connection with the underlying bone. Current medical imaging technologies  are unable to diagnose changes to this bone-implant interface, so other means must be used to determine the health of these implants.  A mechanical impact technique is being developed in which a small instrumented rod is used to monitor the accelerations which occur during an impact with an implant.  Mathematical models of the implant system are being developed to aid in interpreting the results of the impact while clinical trials are underway to evaluate the effectiveness of the technique. During orthodontic treatment, orthodontists apply continuous force systems to teeth to reposition them permanently with the dental arch to imporve occlusion.  Despite many years of practice and research, a clear understanding of the link between the force levels and the associated rate of tooth movement has not been achieved.  Controlled clinical trials are being developed to help address this important issue.  CT scans will be used to monitor changes in tooth position while the force systems applied and its effects on the supporting structures of the tooth are carefully scrutinized.