De-Deus G, Gurgel-Filho E D, Magalhães K M, Coutinho-Filho T
Department of Endodontics, Rio de Janeiro State University, Rio de Janeiro, Brazil.
Int Endod J. 2006 May;39(5):378-83. doi: 10.1111/j.1365-2591.2006.01082.x.
To determine the percentage of gutta-percha-filled area (PGFA) in the apical third of root canals when filled with either Thermafil, System B or lateral condensation.
Sixty extracted human maxillary central incisor teeth were root filled as following: G1: lateral condensation (n = 20), G2: System B (n = 20) and G3: Thermafil system (n = 20). A horizontal section was cut 2 and 4 mm from the apical foramen of each tooth. The samples were prepared for microscopic analysis and photomicrographs of each apical surface were taken at a magnification of 50x. Through digital image analysis, the cross-sectional area of the canal and the gutta-percha was measured. The PGFA was calculated. The PGFA data obtained in the three groups were analysed using a nonparametric Friedman and Wilcoxon signed-rank tests.
Significant differences in PGFA were found between the Thermafil System (G3) and both System B (G2) and lateral condensation (G1) (P < 0.01). The greatest PGFA occurred in the Thermafil group. No significant statistical difference was found between System B and lateral condensation (P > 0.05).
The coated carrier gutta-percha system Thermafil produced significantly higher PGFAs than lateral condensation and System B techniques.
确定使用热牙胶充填系统（Thermafil）、System B或侧向加压充填法时，根管根尖三分之一处牙胶充填面积百分比（PGFA）。
选取60颗拔除的人上颌中切牙，按以下方法进行根管充填：G1组：侧向加压充填法（n = 20），G2组：System B（n = 20），G3组：热牙胶充填系统（n = 20）。从每颗牙齿的根尖孔处分别在2mm和4mm处做水平切片。样本制备用于显微镜分析，在50倍放大倍数下拍摄每个根尖表面的显微照片。通过数字图像分析，测量根管和牙胶的横截面积。计算PGFA。对三组获得的PGFA数据使用非参数Friedman检验和Wilcoxon符号秩检验进行分析。
热牙胶充填系统（G3组）与System B（G2组）及侧向加压充填法（G1组）之间PGFA存在显著差异（P < 0.01）。热牙胶充填系统组的PGFA最大。System B组与侧向加压充填法组之间未发现显著统计学差异（P > 0.05）。
涂层载体牙胶系统热牙胶充填系统产生的PGFA显著高于侧向加压充填法和System B技术。
