Methods : forty - eight patients with omz complex fracture were analysed , and four approaches were selected based on the conditions of the fracture : transconjunctional approach with lateral canthotomy ; intraoral approach ; coronal incision approach ; local approach 方法对48例眶上颌颧骨复合骨折进行分析，列举了4种在治疗中采用的手术方法：同时作外眦切开的结膜入路；上唇颊沟口内入路；冠状切口入路；局部进路。
The use of modern disposable needles has made breakage during local dental anesthesia rare , with the problem being largely restricted to needles of poor quality and situations of improper manipulation , unskilled technique , or sudden unexpected movement by the patient 摘要由于目前使用抛弃式麻醉针头，使得在施行口内注射麻醉剂时，发生断针的情况已降低很多，但如果针头制造品质不良、器械使用不当、操作技巧不纯熟以及病人的过度反应等情形之下，仍然会有断针的可能发生。
Because the direction of vehicles , pedestrians and bicycles are different , there are many traffic interferences and the traffic conflicts in the intersections , so that it easily results in traffic accident . after research on the causes of traffic conflicts in intersections , it is found out that turning - vehicles are the mainly cause of traffic conflicts . therefore , it is important to carry out research on traffic organization optimization method of turning - vehicle flows at at - grade intersections , which becomes the keys to relieve traffic jams and traffic accidents 第二章是论文后继研究的基础理论部分,首先介绍了交通组织优化的概念、思想方法、原则和常用手段,然后以混合交通条件下平面交叉口内的交通冲突理论为基础,归纳出交叉口内的转弯车流交通组织的内容及步骤,本章最后从宏观和微观两个层面介绍交叉口内转弯车流交通组织优化的常用方法。
