Shojaee Nooshin Sadat, Zaeri Zahra, Shokouhi Mohammad Mehdi, Sobhnamayan Fereshteh, Adl Alireza
Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Dent Res J (Isfahan). 2020 Jan 21;17(1):48-53. eCollection 2020 Jan-Feb.
The purpose of this study was to evaluate the effect of calcium hydroxide (Ca[OH] ) residues on the accuracy of two electronic apex locators (EALs) (Root ZX and Raypex 6) in the presence of different irrigants.
In this an study Eighty single-rooted human mandibular premolars were selected. The crowns of the teeth were removed to standardize the working lengths (WLs). Actual WLs (AWLs) were recorded, and the root canals were shaped using protaper rotary instruments up to size F3. Then, the root canals were dried and filled with injectable Ca (OH) paste and the access cavities were temporarily sealed. Teeth were put into four alginate boxes, including two experimental groups ( = 30) and two control groups ( = 10). The pools of alginate were wrapped in wet gazes and stored at 37°C and 100% humidity for 7 days. Then, the root canals were exposed and Ca (OH) paste was removed by normal saline or 5.25% sodium hypochlorite irrigation followed by 17% ethylenediaminetetraacetic acid (EDTA), and the electronic WL (EWL) was measured by Root ZX and Raypex 6. Differences of EWL from AWL were calculated. Furthermore, the percentage of acceptable measurements (tolerance limit of ± 0.5 and ± 1 mm) was calculated for each apex locator. One-way ANOVA test with paired -test and Chi-square test was used to analyze the data ( < 0.05).
The results showed that there was no significant difference between the accuracy of two EALs and irrigants ( > 0.05).
The present study revealed that no statistically significant differences were observed between the two apex locators after Ca(OH) paste removal with different irrigants.
本研究的目的是评估在存在不同冲洗剂的情况下，氢氧化钙（Ca[OH]₂）残留对两种电子根尖定位仪（EALs）（Root ZX和Raypex 6）准确性的影响。
在本实验研究中，选择了80颗单根人类下颌前磨牙。去除牙齿的冠部以标准化工作长度（WLs）。记录实际工作长度（AWLs），并使用Protaper旋转器械将根管预备至F3尺寸。然后，将根管干燥并填充可注射的Ca(OH)₂糊剂，髓腔暂时封闭。将牙齿放入四个藻酸盐盒中，包括两个实验组（n = 30）和两个对照组（n = 10）。藻酸盐池用湿纱布包裹，在37°C和100%湿度下储存7天。然后，暴露根管，用生理盐水或5.25%次氯酸钠冲洗，随后用17%乙二胺四乙酸（EDTA）去除Ca(OH)₂糊剂，并使用Root ZX和Raypex 6测量电子工作长度（EWL）。计算EWL与AWL的差异。此外，计算每个根尖定位仪可接受测量值的百分比（公差范围为±0.5和±1 mm）。使用单因素方差分析、配对t检验和卡方检验分析数据（P < 0.05）。
结果表明，两种EALs的准确性与冲洗剂之间无显著差异（P > 0.05）。
本研究表明，用不同冲洗剂去除Ca(OH)₂糊剂后，两种根尖定位仪之间未观察到统计学上的显著差异。
