Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey.
Department of Mechanical Engineering, Faculty of Technology, Afyon Kocatepe University, Afyonkarahisar, Turkey.
Acta Odontol Scand. 2021 Mar;79(2):156-160. doi: 10.1080/00016357.2020.1850855. Epub 2020 Nov 27.
The aim of this study was to investigate temperature and time variations during root-end resection.
Sixty human premolars were selected. The root canals were enlarged up to ProTaper X3 rotary instrument. A thermocouple was placed into the root canal 1 mm behind the resection line. The teeth were randomly divided into six groups according to the apical resection method: steel bur, tungsten carbide bur, Lindeman bur, diamond bur, laser and ultrasonic surgical piezo with a diamond tip. The root ends were resected 3 mm away from the root apex. The temperature of the root dentine during resection was recorded as maximum temperature, mean temperature and temperature change. The time required for apicectomy was recorded for each group. The Kruskal-Wallis method was used to analyse the differences between temperature changes during apical resections. The significance level was set at 5%.
There was no significant difference between bur groups in terms of temperature increase. The maximum temperature in piezo surgery was significantly higher than the Lindeman, tungsten and steel burs ( < .001). In addition, the maximum temperature in laser surgery was higher than the Lindeman bur ( < .05). An increase in the temperature was mostly seen in piezo surgery and the least temperature change occurred in the Lindeman bur. Mean time stayed under 1 min in each group.
Although piezo caused the highest temperature increase, the measured temperature increase was within physiological limits in all tested techniques.
本研究旨在探讨根管倒预备过程中的温度和时间变化。
选择 60 个人工前磨牙。根管使用 ProTaper X3 根管预备器械扩大至工作长度。将热电偶放置在距根尖切除线 1mm 的根管内。将牙齿随机分为 6 组，根据根尖切除方法进行分组：高速钢球钻、钨钢球钻、Lindeman 球钻、金刚砂钻、激光和超声外科用带金刚砂尖端的超声工作尖。根尖切除距离根尖 3mm。记录根管牙本质在切除过程中的温度作为最高温度、平均温度和温度变化。记录每组根尖切除术所需的时间。使用 Kruskal-Wallis 方法分析根尖切除过程中温度变化的差异。显著性水平设为 5%。
不同球钻组之间的温度升高无显著差异。超声工作尖的最高温度明显高于 Lindeman、钨钢和高速钢球钻（<0.001）。此外，激光手术的最高温度高于 Lindeman 球钻（<0.05）。在超声工作尖中主要观察到温度升高，而 Lindeman 球钻中温度变化最小。每组的平均时间都在 1 分钟以内。
虽然超声工作尖引起的温度升高最高，但在所有测试技术中，测量的温度升高均在生理范围内。
