Dummer P M, Kelly T, Meghji A, Sheikh I, Vanitchai J T
Department of Conservative Dentistry, University of Wales, College of Medicine, UK.
Int Endod J. 1993 Mar;26(2):99-105. doi: 10.1111/j.1365-2591.1993.tb00550.x.
The aim of this in vitro study was to assess the quality of root canal obturation and degree of linear apical dye penetration in teeth root filled with either laterally condensed gutta-percha or Thermafil obturators. A total of 150 teeth with single roots were included in the study. All canals were prepared using a standard step-back technique with anticurvature filing. Radiographs taken of the teeth to show the maximum degree of canal curvature were then exposed and the angle, radius and position of curvature determined. This information about the canals, together with their working length and diameter at end-point, was used to divide the teeth into two experimental and two control groups. A total of eight teeth were excluded because of technical difficulties, 65 were filled with Thermafil obturators, 63 were filled with laterally condensed gutta-percha whilst 14 teeth remained unfilled and acted as controls. Following obturation, the teeth were radiographed in two planes and the technical quality of fill assessed on a four-point scale. All access cavities were then sealed and the teeth immersed in dye for 48 h before being split longitudinally. Linear dye penetration via the apical foramen was then assessed. Canal obturation with Thermafil obturators (0.7 min) was significantly quicker (P < 0.001) than lateral condensation (6.4 min). Apical extrusion of sealer and gutta-percha occurred significantly more often with Thermafil obturators but there was little difference in the technical quality of the fillings and no significant difference in dye penetration. Under the conditions of this study. Thermafil obturators proved a satisfactory alternative to lateral condensation of gutta-percha.
本体外研究的目的是评估用侧向加压牙胶或热牙胶充填根管的牙齿的根管充填质量和根尖线性染料渗透程度。该研究共纳入150颗单根牙。所有根管均采用标准的逐步后退技术和抗弯曲锉法进行预备。然后拍摄牙齿的X线片以显示根管弯曲的最大程度，并确定弯曲的角度、半径和位置。这些关于根管的信息，连同它们的工作长度和终点处的直径，被用于将牙齿分为两个实验组和两个对照组。由于技术困难，共有8颗牙齿被排除，65颗用热牙胶充填，63颗用侧向加压牙胶充填，14颗牙齿未充填作为对照。充填后，在两个平面拍摄牙齿的X线片，并以四分制评估充填的技术质量。然后封闭所有的髓腔入口，将牙齿浸泡在染料中48小时，之后沿纵向劈开。然后评估染料通过根尖孔的线性渗透情况。使用热牙胶充填根管（0.7分钟）比侧向加压（6.4分钟）明显更快（P < 0.001）。使用热牙胶时，封闭剂和牙胶的根尖挤出明显更常见，但充填物的技术质量差异不大，染料渗透也无显著差异。在本研究条件下，热牙胶被证明是侧向加压牙胶的一种令人满意的替代方法。
