De-Deus G, Maniglia-Ferreira C M, Gurgel-Filho E D, Paciornik S, Machado A C R, Coutinho-Filho T
Department of Endodontics, Rio de Janeiro State University, Rio de Janeiro, Brazil.
Aust Endod J. 2007 Aug;33(2):55-61. doi: 10.1111/j.1747-4477.2007.00047.x.
The aim of this study was to determine the percentage of gutta-percha-filled area (GPFA) obtained by Thermafil and System B techniques using light microscopy and digital image processing. Forty-five human mandibular first molars were prepared and obturated as follows: Group 1: lateral condensation (n = 15); Group 2: System B (n = 15); and Group 3: Thermafil system (n = 15). Horizontal sections were cut 4 and 6 mm from the apical foramen of each tooth. The samples were metallographically prepared and taken through photomicrographs. Using digital analysis, the cross-sectional area of the canal and the gutta-percha areas were measured. The GPFA data obtained for the three groups were analysed using the non-parametric Friedman and Wilcoxon Signed-Ranks tests. Significant differences were found between Group 3 and Group 2-Group 1. No significant difference was found between Group 2 and Group 1. The Thermafil system produced significantly higher GPFAs than lateral condensation and System B techniques (P < 0.01). This result suggests that the Thermafil system can reduce sealer and voids.
本研究的目的是使用光学显微镜和数字图像处理技术，确定采用热牙胶充填技术（Thermafil）和System B技术所获得的牙胶充填面积百分比（GPFA）。选取45颗人类下颌第一磨牙，按如下方式进行预备和充填：第1组：侧向加压充填法（n = 15）；第2组：System B技术（n = 15）；第3组：Thermafil系统（n = 15）。从每颗牙齿根尖孔处4毫米和6毫米处制作水平切片。对样本进行金相制备并拍摄显微照片。通过数字分析测量根管横截面积和牙胶所占面积。使用非参数Friedman检验和Wilcoxon符号秩检验对三组获得的GPFA数据进行分析。第3组与第2组和第1组之间存在显著差异。第2组和第1组之间未发现显著差异。Thermafil系统产生的GPFA显著高于侧向加压充填法和System B技术（P < 0.01）。该结果表明，Thermafil系统可减少封闭剂和空隙。
