Sharifi Roohollah, Bahrampour Ehsan, Janfroozzade Pourya, Safaei Mohsen, Mozaffari Hamid Reza, Soltanimehr Elham, Moradpoor Hedaiat, Imani Mohammad Moslem
Department of Endodontics, School of Dentistry, Kermanshah University of Medical Sciences, Iran.
Department of Oral and Maxillofacial Radiology, School of Dentistry, Kermanshah University of Medical Sciences, Iran.
Dent Med Probl. 2019 Apr-Jun;56(2):155-159. doi: 10.17219/dmp/103732.
Calcium hydroxide, due to its favorable properties, such as an antimicrobial effect as well as its ability to dissolve necrotic tissues, inhibit tooth resorption and stimulate the formation of a hard tissue barrier, is widely used in root canal treatment.
The objective of this study was to compare the efficacy of 3 methods of delivery of calcium hydroxide into the canals.
This in vitro experimental study was performed on acrylic resin blocks with simulated curved canals (curvature of 24° and 44°). Calcium hydroxide was delivered into the canals with 3 different instruments : a hand file, a Lentulo and a rotary file. The data was analyzed using the three-way analysis of variance (ANOVA) and Tukey's test.
The density of calcium hydroxide was significantly different among the 3 groups (p < 0.001). The manual delivery technique resulted in the lowest and using a rotary file in the highest density of calcium hydroxide (p < 0.001). The mean density of calcium hydroxide was significantly higher in the canals with curvature of 24°, irrespective of the delivery method (p < 0.001). The lowest mean density of calcium hydroxide was noted at 1 mm and 3 mm from the apex, whereas the highest mean density was noted at 11 mm from the apex, irrespective of delivery method (p < 0.001).
A rotary file seems to be the most efficient instrument for delivering calcium hydroxide into the canals, especially into the apical region of canals with greater curvature.
氢氧化钙因其具有良好的特性，如抗菌作用、溶解坏死组织的能力、抑制牙齿吸收以及刺激硬组织屏障形成等，而被广泛应用于根管治疗。
本研究的目的是比较3种将氢氧化钙输送至根管内方法的疗效。
本体外实验研究在具有模拟弯曲根管（曲率为24°和44°）的丙烯酸树脂块上进行。使用3种不同器械将氢氧化钙输送至根管内：手动锉、Lentulo螺旋输送器和旋转锉。采用三因素方差分析（ANOVA）和Tukey检验对数据进行分析。
3组之间氢氧化钙的密度存在显著差异（p < 0.001）。手动输送技术导致氢氧化钙密度最低，而使用旋转锉时氢氧化钙密度最高（p < 0.001）。无论输送方法如何，曲率为24°的根管内氢氧化钙的平均密度显著更高（p < 0.001）。无论输送方法如何，距根尖1 mm和3 mm处氢氧化钙的平均密度最低，而距根尖11 mm处平均密度最高（p < 0.001）。
旋转锉似乎是将氢氧化钙输送至根管内，尤其是输送至曲率较大的根管根尖区域的最有效器械。
