Stacy G C, Hajjar G
University of Sydney.
Oral Surg Oral Med Oral Pathol. 1994 Jun;77(6):585-8. doi: 10.1016/0030-4220(94)90315-8.
The tips of 100 needles that had been used clinically for the administration of mandibular block anesthesia (50 by students and 50 by staff) were examined individually under a dissecting microscope. Sixty percent of these needles were found to be barbed. With the use of an animal laboratory simulation, it has been shown that the tips of standard needles as used in general dental practice will barb if allowed to touch bone (medial aspect of the mandibular ramus) during the administration of a mandibular block for dentistry using the direct approach and that a relationship exists between the pattern of this barbing, the disposition of the bevel of the needle at the time of its insertion, and the likelihood of lingual or inferior dental nerve involvement on withdrawal of the barbed needle. Simple precautions are advanced for reducing the possibility of nerve or other tissue damage from this source.
对临床上用于下颌阻滞麻醉的100根注射针（学生使用50根，工作人员使用50根）的针尖，在解剖显微镜下逐一进行检查。发现其中60%的针有倒刺。通过动物实验室模拟表明，在牙科使用直接进针法进行下颌阻滞麻醉时，如果标准注射针的针尖在操作过程中接触到骨组织（下颌支内侧），就会形成倒刺，并且这种倒刺的形态、进针时针斜面的方向与倒刺针拔出时舌神经或下牙槽神经受累的可能性之间存在关联。文中提出了一些简单的预防措施，以降低由此造成神经或其他组织损伤的可能性。
