In vitro tensile bond strength of adhesive cements to new post materials.
OBJECTIVE
The purpose of this study was to measure the in vitro tensile bond strength of 3 types of adhesive resin cements to stainless steel, titanium, carbon fiber-reinforced resin, and zirconium oxide post materials.


METHODS
Disks of post materials were polished to 600 grit, air abraded, and ultrasonically cleaned. Zirconium oxide bonding surfaces were pretreated with hydrofluoric acid and silanated. Bis-Core, C&B Metabond, and Panavia cements were bonded to the post specimens and placed in a humidor for 24 hours. Post specimens were debonded in tension. Means and standard deviations (n = 5) were analyzed by 2-way analysis of variance. Tukey-Kramer intervals at the 0.05 significance level were calculated. Failure modes were observed.


RESULTS
Panavia 21 provided the highest bond strengths for all types of post materials, ranging from 22 MPa (zirconium oxide) to 37 MPa (titanium). C&B Metabond bonded significantly more strongly to stainless steel (27 MPa) and titanium (22 MPa) than to zirconium oxide (7 MPa). Bis-Core results were the lowest, ranging from 16 MPa (stainless steel) to 8 MPa (zirconium oxide). In most cases, bonds to carbon fiber post materials were weaker than to stainless steel and titanium, but stronger than to zirconium oxide. In general, higher bond strengths resulted in a higher percentage of cohesive failures within the cement.


CONCLUSIONS
Panavia 21 provided the highest bond strengths to all post materials, followed by C&B Metabond. In most cases, adhesive resins had higher bond strengths to stainless steel, titanium, and carbon fiber than to zirconium oxide.
O'Keefe
K L
KL
Department of Restorative Dentistry and Biomaterials Science, Houston Biomaterials Research Center, University of Texas-Houston Dental Branch, Texas, USA. kokeefe@mail.db.uth.tmc.edu
Miller
B H
BH
Powers
J M
JM
D000269:Adhesives / Q000737:chemistry*; D000704:Analysis of Variance; D001896:Boron Compounds / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002484:Cementation; D003722:Dental Alloys / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D006813:Humidity; D006858:Hydrofluoric Acid / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D000269:Adhesives; D001896:Boron Compounds; D003722:Dental Alloys; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D008768:Methylmethacrylates; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; D012821:Silanes; D013193:Stainless Steel; D002244:Carbon; C049495:Super-bond; D015040:Zirconium; D014025:Titanium; D006858:Hydrofluoric Acid; C028541:zirconium oxide