Cassimiro Marcely, Romeiro Kaline, Gominho Luciana, de Almeida Andressa, Costa Larissa, Albuquerque Diana
Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco (UPE), Camaragibe, PE, Brazil.
, Avenida General Newton Cavalcanti, 1650, Camaragibe, PE, 54753-020, Brazil.
BMC Oral Health. 2017 Jun 2;17(1):93. doi: 10.1186/s12903-017-0387-0.
This study aims to evaluate the frequency of dentinal defects after root canal preparation with the ProTaper NEXT, K3XF and WaveOne GOLD systems using microcomputed tomography.
Sixty permanent mandibular incisors with a single canal were selected. Inspection of the teeth was performed under a stereomicroscope (15x) to observe the presence of pre-existing cracks and fractures lines. Samples were divided into three experimental groups (n = 20): ProTaper NEXT (PTN), K3XF (K3XF) and WaveOne GOLD (WOG). Specimens were scanned through high-resolution microcomputed tomography before and after the preparation of the root canal. Subsequently, all the axial images were examined by two different methods to find possible dentinal defects. Furthermore, an analysis of each millimeter of ten apical millimeters was also performed. The absence or presence of dentinal defects was screened by 3 pre-calibrated blinded examiners.
After analysing all 45,720 slices, dentinal defects were observed in 48,33% (22096 slices). PTN, K3XF and WOG groups represented 11,11% (5079 slices), 17,22% (7873 slices) and 20% (n = 9144) of the cross-sectional images, respectively. At 10 apical millimeters (600 slices), 33,33% (200 slices) presented some dentinal defects, representing 7,22% (43 slices), 13,33% (80 slices) and 12,77% (77 slices) of the cross-sectional images in the PTN, K3XF and WOG groups, respectively. All the dentinal defects presented in the postoperative images existed in the images prior to instrumentation.
There was no correlation between the preparation of a root canal using the PTN, K3XF and WOG systems and the formation of new dentinal defects.
本研究旨在使用微型计算机断层扫描评估使用ProTaper NEXT、K3XF和WaveOne GOLD系统进行根管预备后牙本质缺损的发生率。
选取60颗单根管的恒下颌切牙。在体视显微镜（15倍）下检查牙齿，观察是否存在预先存在的裂纹和骨折线。样本分为三个实验组（n = 20）：ProTaper NEXT（PTN）、K3XF（K3XF）和WaveOne GOLD（WOG）。在根管预备前后通过高分辨率微型计算机断层扫描对标本进行扫描。随后，通过两种不同方法检查所有轴向图像以发现可能的牙本质缺损。此外，还对根尖10毫米的每1毫米进行了分析。由3名预先校准的盲法检查者筛查牙本质缺损的有无。
在分析所有45720层切片后，观察到48.33%（22096层切片）存在牙本质缺损。PTN、K3XF和WOG组分别占横截面图像的11.11%（5079层切片）、17.22%（7873层切片）和20%（n = 9144）。在根尖10毫米（600层切片）处，33.33%（200层切片）存在一些牙本质缺损，分别占PTN、K3XF和WOG组横截面图像的7.22%（43层切片）、13.33%（80层切片）和12.77%（77层切片）。术后图像中出现的所有牙本质缺损在器械操作前的图像中就已存在。
使用PTN、K3XF和WOG系统进行根管预备与新的牙本质缺损形成之间没有相关性。
