Department of Prosthodontics, Dental School, University of Southern Santa Catarina, Tubarão, Santa Catarina, Brazil.
J Prosthet Dent. 2013 Aug;110(2):134-40. doi: 10.1016/S0022-3913(13)60353-4.
Since the introduction of glass fiber posts, irreversible vertical root fractures have become a rare occurrence; however, adhesive failure has become the primary failure mode.
The purpose of this study was to evaluate the push-out bond strength of glass fiber posts cemented with different luting agents on 3 segments of the root.
Eighty human maxillary canines with similar root lengths were randomly divided into 8 groups (n=10) according to the cement assessed (Rely X luting, Luting and Lining, Ketac Cem, Rely X ARC, Biscem, Duo-link, Rely X U100, and Variolink II). After standardized post space preparation, the root dentin was pretreated for dual-polymerizing resin cements and untreated for the other cements. The mixed luting cement paste was inserted into post spaces with a spiral file and applied to the post surface that was seated into the canal. After 7 days, the teeth were sectioned perpendicular to their long axis into 1-mm-thick sections. The push-out test was performed at a speed of 0.5 mm/min until extrusion of the post occurred. The results were evaluated by 2-way ANOVA and the all pairwise multiple comparison procedures (Tukey test) (α=.05).
ANOVA showed that the type of interaction between cement and root location significantly influenced the push-out strength (P<.05). The highest push-out strength results with root location were obtained with Luting and Lining (S3) (19.5 ±4.9 MPa), Ketac Cem (S2) (18.6 ±5.5 MPa), and Luting and Lining (S1) (18.0 ±7.6 MPa). The lowest mean values were recorded with Variolink II (S1) (4.6 ±4.0 MPa), Variolink II (S2) (1.6 ±1.5 MPa), and Rely X ARC (S3) (0.9 ±1.1 MPa).
Self-adhesive cements and glass ionomer cements showed significantly higher values compared to dual-polymerizing resin cements. In all root segments, dual-polymerizing resin cements provided significantly lower bond strength. Significant differences among root segments were found only for Duo-link cement.
自从玻璃纤维桩问世以来，不可逆的垂直根裂已变得罕见，但粘固失败已成为主要的失败模式。
本研究的目的是评估在根管的 3 个部位用不同粘固剂粘固玻璃纤维桩的推出粘结强度。
80 颗上颌恒尖牙根据所评估的粘固剂（Rely X 粘固剂、粘固和衬层、Ketac Cem、Rely X ARC、Biscem、Duo-link、Rely X U100 和 Variolink II）随机分为 8 组（n=10）。在标准化的桩腔预备后，对根管牙本质进行双固化树脂粘固剂预处理，对其他粘固剂不进行预处理。将混合粘固水泥浆插入桩腔中，并用螺旋锉插入，然后将桩表面置于根管内。7 天后，将牙齿沿其长轴垂直切成 1-mm 厚的切片。以 0.5mm/min 的速度进行推出试验，直到桩体被挤出。采用双因素方差分析和所有成对多重比较程序（Tukey 检验）（α=0.05）对结果进行评估。
方差分析显示，粘固剂与根管位置之间的相互作用类型对推出强度有显著影响（P<0.05）。在 S3 位置获得的最大推出强度的结果来自于 Luting 和 Lining（S3）（19.5±4.9MPa）、Ketac Cem（S2）（18.6±5.5MPa）和 Luting 和 Lining（S1）（18.0±7.6MPa）。平均值最低的是 Variolink II（S1）（4.6±4.0MPa）、Variolink II（S2）（1.6±1.5MPa）和 Rely X ARC（S3）（0.9±1.1MPa）。
自粘接粘固剂和玻璃离子粘固剂的数值明显高于双固化树脂粘固剂。在所有根管部位，双固化树脂粘固剂的粘结强度明显较低。只有 Duo-link 粘固剂在根管部位之间有显著差异。
