Gergi Richard M, Osta Nada E, Naaman Alfred S
Department of Endodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon.
Department of Prosthodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon.
Eur J Dent. 2015 Oct-Dec;9(4):508-512. doi: 10.4103/1305-7456.172634.
This study aimed to compare the frequency of dentinal microcracks after root canal shaping with 2 reciprocating (Reciproc and WaveOne) and 1 combined continuous reciprocating motion twisted files adaptive (TFA) rotary system.
Ninety molars were chosen and divided into three groups of 30 each. Root canal preparation was achieved by using Reciproc R25, Primary WaveOne and TFA systems. All the roots were horizontally sectioned at 15, 9, and 3 mm from the apex. The slices were then viewed each under a microscope at × 25 magnification to determine the presence of cracks. The absence/presence of cracks was recorded, and the data were analyzed with a Chi-square test. The significance level was set at P < 0.05.
Instrumentation with Reciproc produced significantly more complete cracks than WaveOne and TFA (P = 0.032). The TFA system produced significantly less cracks then the Reciproc and WaveOne systems apically (P = 0.004).
Within the limits of this study, the TFA system caused less cracks then the full reciprocating system (Reciproc and WaveOne). Single-file reciprocating files produced significantly more incomplete dentinal cracks than full-sequence adaptive rotary motion.
本研究旨在比较使用2种往复式器械（Reciproc和WaveOne）和1种连续往复运动与旋转运动相结合的自适应（TFA）旋转器械进行根管预备后牙本质微裂纹的发生率。
选取90颗磨牙，分为3组，每组30颗。分别使用Reciproc R25、WaveOne初代器械和TFA系统进行根管预备。所有牙根均在距根尖15、9和3mm处水平切片。然后将切片置于显微镜下，以25倍放大倍数观察是否存在裂纹。记录有无裂纹情况，并采用卡方检验对数据进行分析。显著性水平设定为P < 0.05。
与WaveOne和TFA相比，使用Reciproc器械产生的完全裂纹明显更多（P = 0.032）。在根尖部位，TFA系统产生的裂纹明显少于Reciproc和WaveOne系统（P = 0.004）。
在本研究的范围内，TFA系统产生的裂纹少于全往复式系统（Reciproc和WaveOne）。单根往复式器械产生的不完全牙本质裂纹明显多于全序列自适应旋转运动器械。
