Mariá Cortina Bellan, DDS, MS, PhD, Department of Restorative Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
Patrícia Fernandes Jerzewski Sotero da Cunha, DDS, MsC, Private Practice, Porto, Alegre, Brazil.
Oper Dent. 2022 Jul 1;47(4):449-460. doi: 10.2341/21-094-L.
The aim of this laboratory study was to evaluate the pull-out force of a prefabricated fiberglass post (PP), relined fiberglass post (RP), or milled fiberglass post (MP) luted with Multilink N (MN), RelyX Unicem 2 (RXU2) or RelyX Ultimate (RU) to enlarged root canals. The thickness of the resin cements and the presence of voids in the resin cement film were observed. The root canals of 90 bovine incisors were enlarged, endodontically treated, and randomly divided into 9 groups (n=10) according to the post type and resin cement. The specimens were scanned using micro-CT to analyze the thickness of the resin cement and the presence of voids. The specimens were submitted to mechanical cyclic loading (500,000 cycles at 50 N load) and subjected to pull-out force testing. Two-way ANOVA and Tukey's test analyzed the pull-out force and resin cement thickness data. Kruskal-Wallis and Bonferroni tests analyzed the void scores. The interaction between factors (post × resin cement) was significant (p=0.0001) for the pull-out force. Higher pull-out forces were obtained for RP and MP compared to PP. The post factor was significant (p=0.0001) for resin cement thickness, which was higher for PP (1054 μm), followed by MP (301 μm) and RP (194 μm). More void formation occurred for PP, being less for RP, differing significantly among the posts. Post customization (RP and MP) decreased resin cement thickness and void formation, favoring a higher pull-out force. Resin cements requiring an adhesive application (MN and RU) favored higher pull-out force than self-adhesive resin cement (RXU2).
本实验室研究的目的是评估预制玻璃纤维桩（PP）、包绕玻璃纤维桩（RP）和铣削玻璃纤维桩（MP）用 Multilink N（MN）、RelyX Unicem 2（RXU2）或 RelyX Ultimate（RU）黏固到扩大根管后的抗拔力。观察树脂水门汀的厚度和树脂水门汀膜中的空隙。将 90 颗牛切牙的根管扩大、根管治疗并根据桩的类型和树脂水门汀随机分为 9 组（n=10）。使用微 CT 扫描标本以分析树脂水门汀的厚度和空隙的存在。将标本进行机械循环加载（50N 负载下 500000 次循环），然后进行抗拔力测试。采用双向方差分析和 Tukey 检验分析抗拔力和树脂水门汀厚度数据。采用 Kruskal-Wallis 和 Bonferroni 检验分析空隙评分。因素（桩×树脂水门汀）之间的相互作用对抗拔力有显著影响（p=0.0001）。与 PP 相比，RP 和 MP 获得的抗拔力更高。桩因子对抗拔力有显著影响（p=0.0001），PP 的树脂水门汀厚度更高（1054μm），其次是 MP（301μm）和 RP（194μm）。PP 中出现更多的空隙形成，RP 较少，各桩之间差异显著。桩定制（RP 和 MP）降低了树脂水门汀厚度和空隙形成，有利于获得更高的抗拔力。需要使用黏结剂的树脂水门汀（MN 和 RU）比自黏结树脂水门汀（RXU2）更有利于获得更高的抗拔力。
