Department of Dentistry - Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus João David Ferreira Lima, Trindade, Florianópolis, Santa Catarina, CEP: 88040-900, Brazil.
, Florianópolis, Brazil.
Clin Oral Investig. 2021 Jun;25(6):4125-4135. doi: 10.1007/s00784-020-03744-0. Epub 2021 Jan 3.
To assess the influence of different sealers used in root canal filling, in terms of bond strength (BS) to dentin, after restoration of weakened roots using resin composite (RC) and fiber posts.
Roots of 39 maxillary incisors were used. After root canal preparation, root dentin was flared to produce a space between fiber post and root canal walls. The root canals were randomly distributed into three groups (n = 13), according to the sealer used: Endofill, AH Plus, and Acroseal. After removing the filling material to a depth of 12 mm, the flared roots were adhesively restored using RC. Posts were cemented and, after 24 h, roots were sectioned transversely producing 1-mm-thick slices. The slices from 30 roots were used for push-out test, and failure modes were noted. The remaining slices were analyzed by scanning electron microscopy (SEM).
Statistical analysis by 2-way ANOVA showed a significant difference among sealers (p = 0.001) and among root regions (p < 0.001). The BS mean of Endofill was lower and significantly different from the others. Overall, the coronal region presented higher BS mean values, followed by the middle and apical regions of the reinforced roots. The most frequent failure type was the adhesive failure between RC and dentin. SEM analysis showed the formation of a hybrid layer and many tags in the coronal and middle regions, while the apical region exhibited remnants of the endodontic sealers in all groups.
AH Plus and Acroseal sealer groups presented similar results, and the Endofill sealer negatively affected the BS of fiber post to restored root dentin.
Weakened dentin walls are often found in teeth undergoing endodontic treatment, so the sealer used must allow or at least not interfere the bonding between restorative materials and root dentin.
评估在使用树脂复合材料 (RC) 和纤维桩修复弱化根管后，不同根管封闭剂对牙本质粘结强度 (BS) 的影响。
使用 39 颗上颌切牙的牙根。根管预备后，纤维桩与根管壁之间的牙本质扩孔。根据使用的密封剂，将根管随机分为三组 (n = 13)：Endofill、AH Plus 和 Acroseal。去除 12mm 深的填充材料后，使用 RC 对扩孔的牙根进行粘结修复。将纤维桩粘固，24 小时后，将牙根横向切割，制成 1mm 厚的切片。30 个牙根的切片用于推出试验，并记录失效模式。其余切片用扫描电子显微镜 (SEM) 进行分析。
2 因素方差分析显示密封剂之间 (p = 0.001) 和根区之间 (p < 0.001) 存在显著差异。Endofill 的 BS 平均值较低，与其他组有显著差异。总体而言，加固根的冠部区域呈现出较高的 BS 平均值，其次是中部和根尖区域。最常见的失效类型是 RC 与牙本质之间的粘结失效。SEM 分析显示，在冠部和中部区域形成了混合层和许多标签，而在所有组的根尖区域都显示出根管封闭剂的残留物。
AH Plus 和 Acroseal 密封剂组的结果相似，而 Endofill 密封剂会对纤维桩修复的牙本质 BS 产生负面影响。
在进行根管治疗的牙齿中经常会发现弱化的牙本质壁，因此使用的密封剂必须允许或至少不干扰修复材料与牙本质之间的粘结。
