São Leopoldo Mandic, School of Medicine and Dentistry, Campinas, São Paulo, Brazil.
São Leopoldo Mandic, School of Medicine and Dentistry, Campinas, São Paulo, Brazil, Phone: +55-19-997731297, e-mail:
J Contemp Dent Pract. 2022 Apr 1;23(4):388-392.
To assess dentin-post bond strength and mode of failure through tensile strength testing of two endodontic post systems: CAD/CAM custom-milled fiber posts vs Splendor SAP.
Thirty extracted single-rooted mandibular premolars were sectioned 2 mm coronal to the cementoenamel junction. Root length was standardized at 15 mm, and the root canals were instrumented with #20 K-files followed by 30/0.03 and 30/0.05 ProDesign Logic rotary files, under irrigation with 2.5% NaOCl, and then submitted to final irrigation with 17% EDTA. Canals were filled with gutta-percha and AH PLUS sealer. After 24 hours, the teeth were prepared for post placement to a depth of 10 mm and randomly allocated into two experimental groups ( = 15): CAD/CAM (CC) and Splendor SAP (SS). All posts were cemented with RelyX U200 dual-cure self-adhesive resin cement. The roots were embedded in acrylic resin, and the specimens were stored for 7 days in moist heat (37°C). Tensile strength testing until failure was then performed in a universal testing machine using a crosshead speed of 0.5 mm/minute. The final failure load was tabulated for statistical analysis, and the G test was used to compare the failure modes observed under light microscopy (5× magnification).
There was no significant difference between groups regarding tensile bond strength to root dentin ( = 0.325). Conversely, failure mode differed significantly between groups ( = 0.037).
The tensile bond strength observed for the CAD/CAM and Splendor SAP post systems was similar. Adhesive failure was predominant in both groups; however, the CAD/CAM custom-milled fiber posts failed predominantly at the dentin-resin cement interface, whereas Splendor SAP posts failed mostly at the post-resin cement interface.
A strong post-dentin bond is a key to the success of dental restorations and prosthetic rehabilitation. In teeth with severe coronal decay and wide canals, both of the tested systems would be able to achieve good cervical fit.
通过对两种根管桩系统（CAD/CAM 定制纤维桩和 Splendor SAP）进行拉伸强度测试，评估牙本质-桩粘结强度和失效模式。
从 30 颗下颌前磨牙中随机选取 30 颗，截冠 2mm 于牙釉牙骨质界。将根长标准化至 15mm，使用 20#K 锉，随后使用 30/0.03 和 30/0.05 ProDesign Logic 旋转锉进行根管预备，冲洗液为 2.5%次氯酸钠，最后用 17% EDTA 冲洗。根管用牙胶和 AH PLUS 密封剂充填。24 小时后，将牙齿制备成深 10mm 的桩道，并随机分为两组（n=15）：CAD/CAM（CC）和 Splendor SAP（SS）。所有桩均用 RelyX U200 双固化自粘结树脂水门汀粘结。将根嵌入丙烯酸树脂中，将标本在湿热（37°C）中储存 7 天。然后，在万能试验机上以 0.5mm/min 的十字头速度进行拉伸强度测试，直至试件破坏。记录最终破坏载荷进行统计学分析，并用 G 检验比较在 5×放大倍数下观察到的光镜下失效模式。
两组牙本质粘结强度无显著差异（ = 0.325）。相反，两组间失效模式有显著差异（ = 0.037）。
CAD/CAM 和 Splendor SAP 桩系统的拉伸粘结强度相似。两组均以黏结破坏为主；然而，CAD/CAM 定制纤维桩主要在牙本质-树脂水泥界面失效，而 Splendor SAP 桩主要在桩-树脂水泥界面失效。
强的桩-牙本质粘结是牙体修复和修复体成功的关键。对于严重冠部龋坏和宽根管的牙齿，两种测试系统都能获得良好的颈部适合度。
