Multi-step adhesive cementation versus one-step adhesive cementation: push-out bond strength between fiber post and root dentin before and after mechanical cycling.
This study evaluated the effects of mechanical cycling on resin push-out bond strength to root dentin, using two strategies for fiber post cementation. Forty bovine roots were embedded in acrylic resin after root canal preparation using a custom drill of the fiber post system. The fiber posts were cemented into root canals using two different strategies (N = 20): a conventional adhesive approach using a three-step etch-and-rinse adhesive system combined with a conventional resin cement (ScotchBond Multi Purpose Plus + RelyX ARC ), or a simplified adhesive approach using a self-adhesive resin cement (RelyX U100). The core was built up with composite resin and half of the specimens from each cementation strategy were submitted to mechanical cycling (45 degree angle; 37 degrees C; 88 N; 4 Hz; 700,000 cycles). Each specimen was cross-sectioned and the disk specimens were pushed-out. The means from every group (n = 10) were statistically analyzed using a two-way ANOVA and a Tukey test (P = 0.05). The cementation strategy affected the push-out results (P < 0.001), while mechanical cycling did not (P = 0.3716). The simplified approach (a self-adhesive resin cement) had better bond performance despite the conditioning. The self-adhesive resin cement appears to be a good option for post cementation. Further trials are needed to confirm these results.
Faculty of Odontology, Sao Paulo State University (UNESP), Sao Jose dos Campos, Brazil.
Marina
M
Amaral
Marilia Pivetta
MP
Rippe
Cesar Dalmolin
CD
Bergoli
Carlo
C
Monaco
Luiz Felipe
LF
Valandro
D000818:Animals; D002417:Cattle; D002484:Cementation / Q000379:methods*; D003188:Composite Resins; D001840:Dental Bonding; D003799:Dental Stress Analysis; D005898:Glass; D011176:Post and Core Technique; D019279:Resin Cements
D003188:Composite Resins; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; C009753:fiberglass