Influência do material lubrificante e limpeza ou não do conduto radicular na resistência de união de pinos anatomizados

Abstract

Anatomized posts are currently indicated for teeth with wide canals and thin walls, which requires intraradicular posts as retention auxiliary for the restorative material. For the anatomized posts confection a lubricant of the canals walls is needed. Therefore, the aim of this study was to evaluate the influence of the lubricant material used in the root canal preparation and cleaning or not previously cementation on the bond strength of anatomized posts cemented with resin-based cement. Eighty bovine incisors were obturated, post spaces were prepared and the teeth were divided into four groups depending on the protocol used for lubrication of the canal during anatomized post preparation: petrolatum gel without cleaning (PG); petrolatum gel followed by cleaning with paper points (PGC); hydrosoluble gel without cleaning (HG); and hydrosoluble gel followed by cleaning with water irrigation and drying with paper points (HGC). Anatomized posts relined with composite resin were luted with conventional resin cement. Each root was sectioned transversally producing1.5mm thick slices, and the push-out bond strength test was performed. Data were analyzed by one-way ANOVA followed by Tukey post-hoc test (a=0.05). Statistically significant differences were observed between the materials used for lubrication of the canal (p<0.001), the use of hydrosoluble gel showing higher bond strength (HG: 4.068 ± 0.720; HGC: 4.426 ± 0.877) than petrolatum gel (PG: 2.922 ± 0.431; PGC: 3.250 ± 0.751) regardless of cleaning the canal after lubrication and prior to the post cementation. Differences did not found between cleaning or no, when the same lubricant was used. The lubricating technique affected the bond strength of anatomized posts, while the removal of the lubricant prior to the anatomized post cementation does not seem to affect the bond strength.