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Benefits of a two-step cementation procedure for prefabricated fiber posts
Leontine A Jongsma1, Peter B Bolhuis, Prem Pallav
1Department of Dental Materials Sciences, ACTA, Universiteit van Amsterdam amd Vrije Universiteit, Amsterdam, the Netherlands.
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.
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