Grandini Simone, Goracci Cecilia, Monticelli Francesca, Borracchini Andrea, Ferrari Marco
University of Siena, Italy.
J Adhes Dent. 2005 Autumn;7(3):235-40.
To verify with SEM the cement layer thickness and uniformity of resin-relined translucent fiber posts (anatomic posts) and standard translucent fiber posts.
On 20 extracted maxillary anterior teeth, the roots were endodontically treated and prepared for the insertion of a fiber post. Translucent fiber posts (DT) were luted with a dual-curing resin cement (Duo-Link) in 10 specimens (group 1) after the canal walls had been treated with the One-Step bonding system. In the other 10 specimens (group 2), experimental anatomic posts (Anatomic Post'n Core) were tested. To these posts, a layer of light-curing resin is added to allow for a pre-cementation relining of the post, aimed at improving its fit into the endodontic space. For luting, the same adhesive-resin cement combination of group 1 was used. All the roots were sectioned and prepared for SEM observations. At the 1-mm, 4.5-mm, and 8-mm level of each root, cement thickness was measured, and the presence of gaps or voids within the luting material or at its interfaces was evaluated. A statistical analysis was performed to test the significance of differences in the cement layer thickness around the two types of post and at different levels of the same type of post.
In the presence of anatomic posts, the cement layer was significantly thinner and more uniform at the coronal and middle level of the root. In both groups, voids and bubbles were detected within the luting material, within the abutment material, and between fiber post and cement. Gaps were also visible between post and relining material.
The resin cement thickness was significantly lower in the anatomic post group than in the control group (standardized posts), except at the apical third of the canal, where there was no statistically significant difference. A good adaptation of anatomic posts was evident in all of the specimens.
通过扫描电子显微镜（SEM）验证树脂重衬的半透明纤维桩（解剖桩）和标准半透明纤维桩的粘结剂层厚度及均匀性。
选取20颗拔除的上颌前牙，对牙根进行根管治疗并预备以插入纤维桩。10个标本（第1组）在根管壁用一步法粘结系统处理后，用双固化树脂粘结剂（Duo-Link）粘结半透明纤维桩（DT）。在另外10个标本（第2组）中，测试实验性解剖桩（Anatomic Post'n Core）。对于这些桩，添加一层光固化树脂以便在粘结前对桩进行重衬，目的是改善其与根管空间的贴合度。粘结时，使用与第1组相同的粘结性树脂粘结剂组合。将所有牙根进行切片并制备用于SEM观察。在每个牙根的1mm、4.5mm和8mm水平处测量粘结剂厚度，并评估粘结材料内部或其界面处是否存在间隙或空隙。进行统计分析以检验两种类型桩周围以及同一类型桩不同水平处粘结剂层厚度差异的显著性。
在使用解剖桩的情况下，牙根冠部和中部水平的粘结剂层明显更薄且更均匀。在两组中，在粘结材料内部、基台材料内部以及纤维桩与粘结剂之间均检测到空隙和气泡。桩与重衬材料之间也可见间隙。
解剖桩组的树脂粘结剂厚度明显低于对照组（标准桩），但在根管根尖三分之一处除外，此处无统计学显著差异。在所有标本中，解剖桩均显示出良好的适应性。
