Department of Operative Dentistry and Periodontology, University School of Dental Medicine, CharitéCentrum 3, Charité - Universitätsmedizin Berlin, Berlin, Germany.
Int Endod J. 2012 Dec;45(12):1116-26. doi: 10.1111/j.1365-2591.2012.02081.x. Epub 2012 Jun 20.
To investigate the effects of various cleaning methods, luting agents and preparation procedures on fibre post retention.
In total, 156 human canines were allocated to twelve groups. Teeth were decoronated, instrumented and root filled using warm vertical gutta-percha compaction. Post space preparation was performed in 78 roots using the dedicated preparation drills of the DT Light Post SL system [group post drill (PD)]. Gutta-percha was removed from the other 78 roots using a round bur (RB) (group RB). Within each of these two groups, 26 root canals were rinsed with 1% NaOCl (control), 26 were cleaned using rotating brushes and pumice powder, and 26 were sandblasted with Al(2) O (3) (50 μm) using an intraoral device. Cleanliness of each root canal was investigated using an operating microscope (n = 24) and scanning electron microscope (n = 2). Fibre posts were inserted using self-adhesive resin cement (SmartCem2) or core build-up material (CoreX Flow/XP Bond). Pull-out force was measured using a universal testing machine. Statistical analyses were performed using three-way anova and Tukey's HSD post hoc tests.
Root canal cleanliness was not affected by the cleaning method (P = 0.618, chi-squared test). Pull-out force for fibre posts was significantly affected by the cleaning method (P = 0.008), the luting agent (P < 0.0005) and the preparation procedure (P < 0.0005, three-way anova). RB group demonstrated significantly higher pull-out forces [399 (88) N] compared with PD group [287 (105) N]. Posts that were inserted using CoreX Flow/XP Bond exhibited significantly higher pull-out forces [370 (62) N] compared with posts inserted using SmartCem2 [315 (141) N].
The different cleaning methods did not lead to significant differences in root canal cleanliness and did not enhance fibre post retention inside the root canal. However, post space preparation using a RB might be beneficial for improving retention, especially when self-adhesive cements are used. The use of the core build-up material CoreX Flow/XP Bond instead of the self-adhesive resin cement, SmartCem 2, resulted in significantly higher pull-out force.
研究不同的清洁方法、黏结剂和预备程序对纤维桩固位的影响。
总共 156 个人类恒磨牙被分为 12 组。牙齿经过去冠、器械预备和热垂直牙胶加压充填根管。在 78 个根管中使用 DT Light Post SL 系统的专用预备钻（PD 组）进行桩道预备。在另外 78 个根管中使用根管圆锉（RB）（RB 组）去除牙胶。在这两组中，每组 26 个根管用 1%次氯酸钠（对照）冲洗，26 个根管用旋转刷和浮石粉清洁，26 个根管用口腔内设备喷砂用 Al(2)O (3)（50 μm）。使用手术显微镜（n=24）和扫描电子显微镜（n=2）检查每个根管的清洁度。使用自黏结树脂水泥（SmartCem2）或核构建材料（CoreX Flow/XP Bond）插入纤维桩。使用万能试验机测量拔出力。使用三因素方差分析和 Tukey 的 HSD 事后检验进行统计分析。
根管清洁度不受清洁方法的影响（P=0.618，卡方检验）。纤维桩的拔出力显著受清洁方法（P=0.008）、黏结剂（P<0.0005）和预备程序（P<0.0005，三因素方差分析）的影响。RB 组的拔出力显著高于 PD 组[399（88）N]。使用 CoreX Flow/XP Bond 插入的桩的拔出力显著高于使用 SmartCem2 插入的桩[370（62）N]。
不同的清洁方法不会导致根管清洁度显著差异，也不会增强纤维桩在根管内的固位。然而，使用 RB 进行桩道预备可能有助于提高固位力，尤其是在使用自黏结水泥时。使用核构建材料 CoreX Flow/XP Bond 代替自黏结树脂水泥 SmartCem 2 可显著提高拔出力。
