Zhang Chang Yuan, Yu Hao, Lin Qi, Taira Yohsuke, Cheng Hui
Chin J Dent Res. 2019;22(3):189-196. doi: 10.3290/j.cjdr.a43113.
To evaluate the bond strength of fiber posts to intraradicular dentine pretreated with two root canal obturation techniques and three postspace irrigation solutions.
A total of 96 human premolars were collected and treated with complete or partial root canal obturation techniques. The roots were further divided into three subgroups (n = 16) based on postspace irrigation solutions: 2.5% NaOCl, 37% phosphoric acid etching, and distilled water. The fiber posts were bonded with self-adhesive resin cement, and the roots were sectioned into three slices (cervical, middle, and apical regions) after 5,000 thermocycles. The push-out bond strengths were determined and subjected to analysis of variance (α = 0.05). A stereomicroscope was used to observe the failure modes of the specimens.
The irrigation solution, root canal obturation technique, and root region had significant effects on bond strength (P < 0.001). The completely obturated root canals showed significantly lower bond strength than the partially obturated root canals. The 2.5% NaOCl treatment produced the highest bond strength among the three irrigation solutions. Among the root regions, the cervical part showed significantly greater bond strength than the middle and apical parts. The most common failure mode was mixed failure.
The partial root canal obturation technique provided better bond strength of the fiber post to intraradicular dentine. Irrigation with 2.5% NaOCl solution and phosphoric acid etching before cementation improved the push-out bond strength of the fiber posts to intraradicular dentine.
评估两种根管充填技术和三种桩道冲洗液预处理后纤维桩与根管内牙本质的粘结强度。
收集96颗人前磨牙，采用完全或部分根管充填技术进行处理。根据桩道冲洗液将牙根进一步分为三个亚组（n = 16）：2.5%次氯酸钠、37%磷酸酸蚀和蒸馏水。用自粘结树脂水门汀粘结纤维桩，经过5000次热循环后将牙根切成三片（颈部、中部和根尖部）。测定推出粘结强度并进行方差分析（α = 0.05）。使用体视显微镜观察标本的失败模式。
冲洗液、根管充填技术和牙根区域对粘结强度有显著影响（P < 0.001）。完全充填的根管显示出比部分充填的根管显著更低的粘结强度。在三种冲洗液中，2.5%次氯酸钠处理产生的粘结强度最高。在牙根区域中，颈部的粘结强度显著高于中部和根尖部。最常见的失败模式是混合性失败。
部分根管充填技术为纤维桩与根管内牙本质提供了更好的粘结强度。粘结前用2.5%次氯酸钠溶液冲洗和磷酸酸蚀可提高纤维桩与根管内牙本质的推出粘结强度。
