Borer Robert E, Britto Leandro R, Haddix James E
Department of Endodontics, University of Florida, College of Dentistry, Gainesville, FL 32610-0436, USA.
Quintessence Int. 2007 Mar;38(3):e164-8.
To compare in vitro the retentive values of stainless steel, parallel-sided posts to quartz-fiber, tapered posts for 2 different dowel lengths (5 and 10 mm).
Both post systems were cemented with a dual-cure adhesive resin cement. Single-rooted extracted human teeth (n = 40) were decoronated and randomly divided into 4 groups of 10 samples each. Posts of 5 and 10 mm in length were luted with the resin cement. Each sample was placed on a universal testing machine, and using a push-out method, a vertical load was applied at a crosshead speed of 2 mm/min. The amount of force required to dislodge the post was recorded. The effect of post type and length was evaluated using a 2-way analysis of variance.
A statistically significant main effect was found for post length (P <.001), with the 10-mm posts of both post systems requiring greater force to dislodge than the 5-mm posts. There was no interaction between post length and post type (P >.05).
It is concluded from this study that there is no statistical difference in retention between quartz-fiber, tapered posts and stainless steel, parallel-sided posts when they are cemented with the same resin cement (P >.05). The study also concludes that adequate retentive values are achieved with both post systems at the shorter, 5-mm post length.
