Influence of post pattern and resin cement curing mode on the retention of glass fibre posts.
OBJECTIVE
To evaluate the influence of post design and roughness and cement system (dual- or self-cured) on the retention of glass fibre posts.


METHODS
Two tapered and smooth posts (Exacto Cônico No. 2 and White Post No. 1) and two parallel-sided and serrated posts (Fibrekor 1.25 mm and Reforpost No. 2) were adhesively luted with two different resin cements--a dual-cured (Rely-X ARC) and a self-cured (Cement Post)--in 40 single-rooted teeth. The teeth were divided into eight experimental groups (n = 5): PFD--Parallel-serrated-Fibrekor/dual-cured; PRD--Parallel-serrated-Reforpost/dual-cured; TED--Tapered-smooth-Exacto Cônico/dual-cured; TWD--Tapered-smooth-White Post/dual-cured; PFS--Parallel-serrated-Fibrekor/self-cured; PRS--Parallel-serrated-Reforpost/self-cured; TES--Tapered-smooth-Exacto Cônico/self-cured; TWS--Tapered-smooth-White Post/self-cured. The specimens were submitted to a pull-out test at a crosshead speed of 0.5 mm min(-1). Data were analysed using analysis of variance and Bonferroni's multiple comparison test (alpha = 0.05).


RESULTS
Pull-out results (MPa) were: PFD = 8.13 (+/-1.71); PRD = 8.30 (+/-0.46); TED = 8.68 (+/-1.71); TWD = 9.35 (+/-1.99); PFS = 8.54 (+/-2.23); PRS = 7.09 (+/-1.96); TES = 8.27 (+/-3.92); TWS = 7.57 (+/-2.35). No statistical significant difference was detected for posts and cement factors and their interaction.


CONCLUSIONS
The retention of glass fibre posts was not affected by post design or surface roughness nor by resin cement-curing mode. These results imply that the choice for serrated posts and self-cured cements is not related to an improvement in retention.
Poskus
L T
LT
Department of Restorative Dentistry, School of Dentistry, Federal Fluminense University, Niterói, RJ, Brazil.
Sgura
R
R
Paragó
F E M
FE
Silva
E M
EM
Guimarães
J G A
JG
D002484:Cementation / Q000379:methods; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D005898:Glass; D006801:Humans; D011176:Post and Core Technique; D019279:Resin Cements; D055116:Self-Curing of Dental Resins; D013499:Surface Properties
D019279:Resin Cements; C009753:fiberglass