■牙医在某些注射前弯曲针头;然而,有人担心针头骨折,管腔闭塞,和锐器处理。先前的研究发现,30号针头在四到九个90°弯曲后骨折。这项疲劳寿命研究评估了使用导针器弯曲时,30号牙科针在断裂之前将承受多少个90°弯曲。
■元素材料技术公司的两位运营商,独立测试,检查,和认证公司测试了48个30号针。使用导针器后,操作者将针头弯曲成90°角,并从尖端伸出麻醉剂。然后将针弯曲回0°角,并再次测试了功能。重复该过程,直到麻醉剂由于骨折或阻塞而不能通过针的末端。每个操作员测试24针(每批12针),记录针头骨折前持续弯曲的数量。
■针头失效前持续弯曲的平均次数为40.33(95%置信区间=37.41-43.26),最小值为20,中位数为40,最大值为54。在每次审判中,管腔保持通畅,直到针头骨折。术者间差异有统计学意义(P<0.001)。在针批次之间没有观察到性能的显著差异(P=0.504)。
■我们的结果表明,与以前的研究报告相比,使用针引导器增加了针断裂前持续弯曲的数量(P<0.000001)。未来的研究应进一步评估针引导与其他类型的针跨各种操作者的使用。此外,更多的机会在于探索使用弯曲针头进行麻醉的工作场所安全考虑和临床应用。
UNASSIGNED: Dentists bend needles prior to certain injections; however, there are concerns regarding needle fracture, lumen occlusion, and sharps handling. A previous study found that a 30-gauge needle fractures after four to nine 90° bends. This fatigue life study evaluated how many 90° bends a 30-gauge dental needle will sustain before fracture when bent using a needle guide.
UNASSIGNED: Two operators at Element Materials Technology, an independent testing, inspection, and certification company tested 48 30-gauge needles. After applying the needle guide, the operators bent the needle to a 90° angle and expressed the anesthetic from the tip. The needle was then bent back to a 0° angle, and the functionality was tested again. This process was repeated until the anesthetic failed to pass through the end of the needle due to fracture or obstruction. Each operator tested 24 needles (12 needles from each lot), and the number of sustained bends before the needle fracture was recorded.
UNASSIGNED: The average number of sustained bends before needle failure was 40.33 (95% confidence interval = 37.41-43.26), with a minimum of 20, median of 40, and a maximum of 54. In each trial, the lumen remained patent until the needle fractured. The difference between the operators was statistically significant (P < 0.001). No significant differences in performance between needle lots were observed (P = 0.504).
UNASSIGNED: Our results suggest that using a needle guide increases the number of sustained bends before needle fracture (P < 0.000001) than those reported in previous studies. Future studies should further evaluate the use of needle guides with other needle types across a variety of operators. Furthermore, additional opportunities lie in exploring workplace safety considerations and clinical applications of anesthetic delivery using a bent needle.