Chou I-Chian, Wang Hao-Ting, Chen Yung-Chung, Hsu Yi-Fan, He Wei-Hung
Department of Dentistry, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan.
School of Dentistry & Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
J Dent Sci. 2022 Oct;17(4):1689-1696. doi: 10.1016/j.jds.2022.02.016. Epub 2022 Mar 17.
BACKGROUND/PURPOSE: Self-etching bonding systems are widely used in fiber post cementation. However, no clear guidelines are established for choosing pre- or co-curing procedures. We investigated the bond strength of fiber post cementation using pre-/co-curing methods in self-etching bonding systems and compared them with those of a self-adhesive system.
Post spaces were prepared in 30 single-rooted premolars/canines, and the fiber posts were cemented in three ways (10 specimens per group): using a self-etching bonding system with either a pre-curing or simultaneous co-curing procedure (RelyX™ Ultimate; groups SE-pre and SE-co, respectively) and using a self-adhesive system (RelyX™ Unicem 2, group SA). Each specimen was embedded and sliced perpendicularly to the long axis into three 2.5-mm-thick sections. Microphotographs of the coronal and apical surfaces of each section were acquired, and push-out tests (1 mm/min) were performed. One-way analysis of variance was conducted on the data, followed by Tukey's honestly significant difference post hoc test.
The bond strength in the whole root was not significantly different among the three groups. When independently evaluating each portion, group SE-co exhibited significantly lower coronal bond strength. The bond strength varied among root regions only in group SE-pre; the apical region had a significantly lower value.
No cementation method is superior in all portions. Regarding pre-curing methods, clinicians must caution the fit between the post and post space, which may be affected by the pre-polymerized bond layer. The co-curing method used in a larger coronal cement space contributes to the poor bond strength.
背景/目的：自酸蚀粘结系统广泛应用于纤维桩粘结。然而，对于选择预固化或同时固化程序，尚未建立明确的指导原则。我们研究了在自酸蚀粘结系统中使用预固化/同时固化方法进行纤维桩粘结的粘结强度，并将其与自粘结系统的粘结强度进行比较。
在30颗单根前磨牙/尖牙中制备桩道，采用三种方法粘结纤维桩（每组10个样本）：使用自酸蚀粘结系统并采用预固化或同时固化程序（分别为RelyX™ Ultimate；SE-pre组和SE-co组），以及使用自粘结系统（RelyX™ Unicem 2，SA组）。每个样本进行包埋，并垂直于长轴切成三个2.5毫米厚的切片。获取每个切片冠面和根尖面的显微照片，并进行推出试验（1毫米/分钟）。对数据进行单因素方差分析，随后进行Tukey事后检验。
三组之间全根的粘结强度无显著差异。单独评估各部分时，SE-co组的冠部粘结强度显著较低。仅在SE-pre组中，粘结强度在不同根区域有所变化；根尖区域的值显著较低。
没有一种粘结方法在所有部分都具有优势。对于预固化方法，临床医生必须注意桩与桩道之间的适配，这可能会受到预聚合粘结层的影响。在较大的冠部粘结空间中使用的同时固化方法导致粘结强度较差。
