Department of Endodontics, São Leopoldo Mandic School of Dentistry, Campinas, SP, Brazil.
Department of Restorative Dentistry, Division of Endodontics, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Braz Dent J. 2023 Jul-Aug;34(4):44-53. doi: 10.1590/0103-6440202305517.
This study aimed to evaluate the temperature changes that the different methods of agitation of irrigants promote on the external dental root surface. Nine extracted human lower premolars were standardized by cone-beam computed tomography and used. The root canal was instrumented with a Reciproc 40.06 file. Temperature measurement was performed using K-type thermocouple sensors attached to the middle, cervical, and apical thirds of the teeth. The teeth had their roots immersed in distilled water at 37ºC, which were distributed into 3 experimental groups according to the mechanical agitation methods to be studied. US Group (n=3), Irrisonic Ultrasonic Tip activated through ultrasound; EC Group (n=3), Easyclean Tip coupled to a contra-angle low-speed handpiece; XP Group (n=3), XP-endo Finisher file coupled to an endodontic electrical motor. Temperature measurements were performed simultaneously with agitation and irrigation of intracanal irrigants. Statistical analysis was performed using SPSS software with a significance level of 5%. For multiple comparisons, the Tukey test was used. The association between mechanical agitation methods and root third was statistically significant. Regarding the temperatures recorded on the external surface of the roots, the ultrasonic tip was significantly higher than the XP-endo Finisher file and the Easyclean tip, which did not differ from each other. Regarding the ultrasonic tip, the external temperature in the middle third (39.46ºC) of the root was significantly lower than in the cervical (40.41ºC) and apical third (40.53ºC). None of the agitation methods of irrigants studied presented heating above 47ºC, and their use is safe for periodontal tissues.
本研究旨在评估不同根管冲洗液搅拌方法对外科牙根管表面温度的影响。选取 9 颗离体下颌前磨牙，经锥形束 CT 扫描标准化后使用。采用 Reciproc 40.06 锉预备根管。使用 K 型热电偶传感器测量牙齿的中、颈、根尖三分之一处的温度。将牙齿根部浸泡在 37℃蒸馏水中，根据研究中要使用的机械搅拌方法将其分为 3 个实验组。US 组（n=3），通过超声激活 Irrisonic 超声尖端；EC 组（n=3），将 Easyclean 尖端与低速手机相连；XP 组（n=3），将 XP-endo 锉与根管马达相连。在搅拌和冲洗根管冲洗液的同时进行温度测量。使用 SPSS 软件进行统计分析，显著性水平为 5%。对于多重比较，使用 Tukey 检验。机械搅拌方法与根管三分之一的关系具有统计学意义。关于记录在根外部表面的温度，超声尖端明显高于 XP-endo 锉和 Easyclean 尖端，后两者之间没有差异。关于超声尖端，根中部（39.46°C）的外部温度明显低于颈部（40.41°C）和根尖部（40.53°C）。研究中使用的所有冲洗液搅拌方法均未产生超过 47°C 的加热，其使用对牙周组织是安全的。
