Abstract
The retention of zirconia-based ceramic posts (CosmoPost system) luted with glass ionomer and resin cements was evaluated. Thirty-two extracted, caries-free, unrestored teeth were selected and stored in chlorhexidine and water solution. The teeth were endodontically treated and randomly assigned to two groups (n=16). Each tooth was decoronated and prepared to a depth of 10.0 mm from root surface to receive a 1.4 mm diameter zirconium dioxide post. Each group had posts cemented with either glass ionomer cement (Fuji I) or resin cement (Variolink II). The post/teeth specimens were embedded in resin blocks and subjected to tensile testing. The tensile force required to dislodge the cemented posts in a tensile testing machine was recorded. The mean stress values of both groups were analyzed for statistical differences using ANOVA and Student's t-test. Significance level was set at 5%. Mean peak forces at failure (N) and standard deviation for the tested cements were the following: Fuji I = 121.8 (+/-17.4) and Variolink II = 228.1 (+/-36.8). Posts luted with the resin cement presented statistically significant higher tensile bond strength than those retained with glass ionomer (p<0.05). It may be concluded that zirconia posts cemented with resin-based cement (Variolink II) failed at statistically significant higher values compared to those cemented with glass ionomer cement (Fuji I). Regardless of the cement type, the posts failed adhesively at the cement/post interface when subjected to a tensile force.
Highlights
The only function of an endodontic post is to retain the core to facilitate a final cuspal coverage restoration
Posts luted with the resin cement presented statistically significant higher tensile bond strength than those retained with glass ionomer (p
The use of natural teeth in the evaluation of post systems has been considered acceptable by investigators in this field [7]
Summary
The only function of an endodontic post is to retain the core to facilitate a final cuspal coverage restoration. The ability of a cement to retain a post, a passive post, will greatly influence the success of the restoration. Length, surface configuration and type of endodontic post all play a major role in the behavior of the post/tooth complex [1]. It has been postulated that when the cement lute fails the fulcrum point moves in an apical direction. This can increase the lever arm and magnify stresses, leading to further degradation of the cement and an increase in apical stress, which may cause root fracture [1,2]
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