Skapetis Tony, Doan-Tran Phuong Diem, Hossain Nibir M
Faculty of Medicine & Health, Sydney Dental School, Clin A/Prof University of Sydney, Westmead Centre for Oral Health, WSLHD, Westmead, NSW, Australia.
Faculty of Medicine & Health, Sydney Dental School, University of Sydney, Sydney, NSW, Australia.
Aust Endod J. 2019 Dec;45(3):325-330. doi: 10.1111/aej.12361. Epub 2019 Jul 3.
The study aimed to investigate whether any correlation existed between bevel orientation and needle tip deformation following the administration of a standard inferior alveolar nerve block (IANB) technique during patient treatment. Ninety-three needles of a single brand were collected from a group of eleven similarly trained Australian dentists' following either single or dual insertion and bone contact. Specimens were examined under scanning electron microscopy at 500x, and both the direction of deformation (either towards or away from lumen) and the extent of deformation were calculated using image processing software. Results showed no correlation between bevel orientation and either the direction (P = 0.8787) or degree (P = 0.0752) of deformation. Significance was demonstrated, regardless of bevel orientation, following multiple needle use with respect to extent of needle tip deformation (P < 0.0001). A clinical recommendation can be made that the dental needle should be routinely replaced when subsequent injections are required during the delivery of a typical IANB.
本研究旨在调查在患者治疗过程中，采用标准下牙槽神经阻滞（IANB）技术给药后，斜面方向与针尖变形之间是否存在任何相关性。从一组11名受过类似培训的澳大利亚牙医那里收集了93根单一品牌的针头，这些针头经过单次或两次插入并接触骨质。在500倍扫描电子显微镜下检查标本，并使用图像处理软件计算变形方向（朝向或远离管腔）和变形程度。结果显示，斜面方向与变形方向（P = 0.8787）或变形程度（P = 0.0752）之间均无相关性。无论斜面方向如何，多次使用针头后，针尖变形程度具有统计学意义（P < 0.0001）。可以提出一项临床建议，即在进行典型的IANB注射时，如果需要后续注射，牙科针头应常规更换。
