J Adhes Dent. 2010 Feb;12(1):55-62. doi: 10.3290/j.jad.a17534.
ABSTRACT
PURPOSE: To determine whether two-step cementation of prefabricated fiber posts leads to higher bond strengths.
MATERIALS AND METHODS: Forty-eight human canine teeth were divided into six groups and fiber posts were cemented with DC Core, RelyX Unicem and Panavia F2.0, according to a one-step or two-step procedure. Per root, four cross-sections were prepared. The differences in push-out strength between procedure, cement and location within the root were determined.
RESULTS: For all cements, the push-out strengths for the two-step procedure were significantly higher than for the one-step procedure (p < 0.001). Differences between the cements for both the one-step and two-step procedure were not statistically significant (p = 0.05).
CONCLUSION: The reduction of the C-factor by means of a two-step cementation, a procedure equivalent to the layering technique of composite restorations, resulted in significantly higher bond strengths. The increase of 60% in bond strength may be beneficial to the retention of post and core restorations.
PMID:20155231 | DOI:10.3290/j.jad.a17534
