Heck Luana, Weissheimer Theodoro, Souza Calefi Pedro Henrique, Alcalde Murilo Priori, Vivan Rodrigo Ricci, da Rosa Ricardo Abreu, Hungaro Duarte Marco Antonio, Reis Só Marcus Vinicius
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Department of Restorative Dentistry, Dental Materials and Endodontics, University of São Paulo, Bauru, São Paulo, Brazil.
Iran Endod J. 2022 Summer;17(3):132-137. doi: 10.22037/iej.v17i3.37210.
The aim of this study was to evaluate the bending and cyclic fatigue resistance of Wave One Gold (WOG) and X1 Blue (X1B) instruments when tested at body temperature (36°C ± 1°C) with and without subjected to an alloy cooling protocol.
A total of sixty instruments (n=30) were tested. Forty instruments (n=20) were randomly selected and divided into two groups: body temperature (BT; n=20) and body temperature with cooling protocol (CP; n=20). Cyclic fatigue test was performed until fracture in a conventional stainless-steel device with water bath equipment to simulate body temperature. CP group instruments were subjected to 5 seconds of spray cooling every 30 seconds. Time to fracture was recorded in seconds. Resistance to bending at an angle of 45 degrees was evaluated using twenty instruments (n=10). Fractured surfaces were examined under scanning electron microscopy (SEM). Statistical analysis was performed at a 5% significance level. Results: There was no difference in the cyclic fatigue resistance between instruments in BT groups (>0.05). Cooling protocol significantly increased the cyclic fatigue resistance of X1B instruments (=0.0003) and WOG instruments (=0.0003).
WOG instruments had a significantly lower cyclic fatigue resistance compared to X1B instruments in CP group (=0.0001). There were no significant differences between the values of resistance increase presented by the instruments after cooling (>0.05). Bending test presented no statistically significant differences between the tested instruments (>0.05). Both instruments in both groups showed typical features of cyclic fatigue behavior under SEM.
X1 Blue #25.06 and WaveOne Gold #25.07 instruments presented similar cyclic fatigue resistance. The investigated clinical-replicable cooling protocol improved the cyclic fatigue resistance of the tested instruments, with X1 Blue #25.06 presenting a greater cyclic fatigue resistance after cooling. Both instruments presented a similar bending capacity.
本研究的目的是评估Wave One Gold（WOG）和X1 Blue（X1B）器械在体温（36°C±1°C）下，有无合金冷却方案时的弯曲和循环疲劳抗力。
共测试60根器械（n = 30）。随机选取40根器械（n = 20）并分为两组：体温组（BT；n = 20）和体温加冷却方案组（CP；n = 20）。在配备水浴设备以模拟体温的传统不锈钢装置中进行循环疲劳试验直至器械断裂。CP组器械每30秒接受5秒的喷雾冷却。记录断裂时间（以秒为单位）。使用20根器械（n = 10）评估45度角的抗弯曲能力。在扫描电子显微镜（SEM）下检查断裂表面。以5%的显著性水平进行统计分析。结果：BT组器械之间的循环疲劳抗力无差异（>0.05）。冷却方案显著提高了X1B器械（P = 0.0003）和WOG器械（P = 0.0003）的循环疲劳抗力。
在CP组中，WOG器械的循环疲劳抗力显著低于X1B器械（P = 0.0001）。冷却后器械的抗力增加值之间无显著差异（>0.05）。弯曲试验在受试器械之间无统计学显著差异（>0.05）。两组中的两种器械在SEM下均显示出典型的循环疲劳行为特征。
X1 Blue #25.06和WaveOne Gold #25.07器械具有相似的循环疲劳抗力。所研究的临床可重复冷却方案提高了受试器械的循环疲劳抗力，冷却后X1 Blue #25.06表现出更大的循环疲劳抗力。两种器械具有相似的弯曲能力。
