Souza Ana Carolina de Oliveira, Gonçalves Fernanda de Cássia Papaiz, Anami Lilian Costa, Melo Renata Marques de, Bottino Marco Antonio, Valandro Luis Felipe
J Adhes Dent. 2015 Apr;17(2):175-80. doi: 10.3290/j.jad.a33993.
To evaluate the effect of the insertion technique for resin cement and mechanical cycling on the bond strength between fiber posts and root dentin.
Sixty-four single-rooted bovine teeth were endodontically prepared to receive glass-fiber posts. The insertion of cement into the root canal was performed using one of the following techniques: POS, insertion with the post; LEN, the use of a lentulo-type drill; EXP, insertion with a straight-tip explorer; or CEN, the use of a Centrix syringe. Half of the specimens were mechanically cycled. All specimens were sectioned into slices of 1.8 mm for the push-out test and 0.5 mm for analysis of the cement layer quality.
The insertion technique affected the interaction between factors (bond strength and mechanical cycling; p < 0.0001). Insertion of the Centrix syringe after mechanical cycling showed the highest bond values (13.6 ± 3.2 MPa). Group-to-group comparisons for baseline and cycled conditions indicated that mechanical cycling significantly influenced the bond strength (p < 0.0001) of the POS and CEN groups. The quality of the cement layer did not differ between the techniques when evaluated in the middle (p = 0.0612) and cervical (p = 0.1119) regions, but did differ in the apical region (p = 0.0097), where the CEN group had better layer quality for the two conditions tested (baseline and cycled).
The use of the Centrix syringe improved the homogeneity of the cement layer, reducing the defects in the layer and increasing adhesive strength values to dentin, even after mechanical cycling.
评估树脂水门汀的插入技术及机械循环对纤维桩与牙根牙本质之间粘结强度的影响。
选取64颗单根牛牙，进行根管预备以植入玻璃纤维桩。采用以下技术之一将水门汀插入根管：POS，随桩插入；LEN，使用慢锥型钻；EXP，用直头探针插入；或CEN，使用Centrix注射器。一半标本进行机械循环。所有标本均切成1.8mm厚的切片进行推出试验，切成0.5mm厚的切片分析水门汀层质量。
插入技术影响各因素之间的相互作用（粘结强度和机械循环；p<0.0001）。机械循环后使用Centrix注射器插入显示出最高的粘结值（13.6±3.2MPa）。基线和循环条件下的组间比较表明，机械循环显著影响POS组和CEN组的粘结强度（p<0.0001）。在中部（p=0.0612）和颈部（p=0.1119）区域评估时，各技术之间水门汀层质量无差异，但在根尖区域存在差异（p=0.0097），在两种测试条件（基线和循环）下，CEN组的水门汀层质量更好。
即使在机械循环后，使用Centrix注射器也能提高水门汀层的均匀性，减少层内缺陷并增加与牙本质的粘结强度值。
