Effect of cement type, relining procedure, and length of cementation on pull-out bond strength of fiber posts.
BACKGROUND
As opposed to the cementation metal posts, the cementation of fiber posts has several details that can significantly influence the success of post retention. This study evaluated the effect of the relining procedure, the cement type, and the luted length of the post on fiber posts retention.


METHODS
One hundred eighty bovine incisors were selected to assess post retention; after endodontic treatment, the canals were flared with diamonds burs. Post holes were prepared in lengths of 5, 7.5, and 10 mm; the fiber posts were relined with composite resin and luted with RelyX ARC, RelyX Unicem, or RelyX Luting 2. All cements are manufactured by 3M ESPE (St. Paul, MN). Samples were subjected to a pull-out bond strength test in a universal testing machine; the results (N) were submitted to a three-way analysis of variance and the Tukey post hoc test (alpha = 0.05).


RESULTS
The improvement of post retention occurred with the increase of the post length luted into the root canal; the relining procedure improved the pull-out bond strength. RelyX Unicem and RelyX ARC showed similar values of retention, both showing higher values than RelyX Luting 2.


CONCLUSIONS
Post length, the relining procedure, and the cement type are all important factors for improving the retention of fiber posts.
Macedo
Vanessa Cruz
VC
Department of Dental Materials and Prosthodontics, São José dos Campos Dental School, São Paulo State University, São José dos Campos, SP, Brazil.
Faria e Silva
André Luis
AL
Martins
Luis Roberto Marcondes
LR
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry / Q000627:therapeutic use; D001840:Dental Bonding / Q000379:methods*; D003736:Dental Cavity Lining / Q000295:instrumentation / Q000379:methods; D003738:Dental Cements / Q000737:chemistry* / Q000145:classification / Q000627:therapeutic use; D018772:Dental Marginal Adaptation; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D055119:Elastic Modulus; D005898:Glass; D007180:Incisor; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry / Q000627:therapeutic use; D019233:Retreatment; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000145:classification / Q000627:therapeutic use
D003188:Composite Resins; D003738:Dental Cements; C528569:Rely-X; D019279:Resin Cements; D012387:Root Canal Filling Materials; C009753:fiberglass