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can you help explain why this article suggests UNICEM better

 
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Ramzi



Joined: 20 Jun 2006
Posts: 56

PostPosted: Sun Dec 11, 2011 4:04 pm    Post subject: can you help explain why this article suggests UNICEM better Reply with quote

john,

this study does not make sense to me, it suggests UNICEM go better bond strenght than ARC? can you please help explain the results?



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The Influence of Time and Cement Type on Push-Out Bond Strength of Fiber Posts to Root Dentin

AA Leme • M Coutinho • AF Insaurralde • PMC Scaffa • LM da Silva
Clinical Relevance
A self-adhesive resin cement can provide a significantly stronger bond than a three-step etch-and-rinse adhesive and resin cement when used to lute fiber posts.

SUMMARY
The bond strength of fiber posts luted with resin cements was evaluated after two storage times in different regions of a post space. A total of 40 single-rooted human teeth were endodontically treated and prepared for cementation of fiber posts (White Post DC). In groups 1 and 3 (G1 and G3, respectively), posts were luted with RelyX ARC, whereas the posts in groups 2 and 4 (G2 and G4, respectively) were luted with RelyX Unicem. After one month of storage at 100% humidity, G1 and G2 were transversally sectioned in 1.7-mm slices of the cervical (C), middle (M), and apical (A) thirds of the post space and submitted to push-out testing at 1 mm/min. After nine months of storage, the roots of G3 and G4 underwent the same process. Mean values were analyzed using the Mann-Whitney and Kruskal-Wallis tests (α=0.05). The bond strengths in G2 (C=4.26±2.29; M=4.67±3.54; A=7.27±4.30) were statistically higher than in G1 (C=3.81±1.07; M=1.57±1.62; A=1.99±1.60) in the middle and apical thirds (p=0.001). Bond strengths in G4 (C=3.36±1.39; M=4.49±2.17; A=3.83±1.92) were higher than in G3 (C=2.13±0.47; M=0.94±1.05; A=0.95±1.02) in all evaluated regions (p=0.02, p<0.001, and p<0.001, respectively). When comparing the root regions for each group, G1 had higher values in the cervical third than the middle third (p=0.02). The self-adhesive resin cement showed better results than the conventional resin cement at both storage times. For both materials a similar performance among the three root regions was found. Storage time did not influence the shear bond strength.
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Mon Dec 12, 2011 9:07 am    Post subject: Reply with quote

I am not seeing a description of the adhesive used with the ARC, or even that an adhesive was used at all.

If none was used, Unicem would easily outperform ARC.

If Single Bond was used, ARC would not work especially well as Single Bond is a 5th generation system.

ARC self-cure is nowhere near as good as the light-cure and again it is not clear from the abstract which mode was used.
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