The influence of surface treatment and luting cement on in vitro behavior of two-unit cantilever resin-bonded bridges.
OBJECTIVE
The purpose of this study was to find the optimal combination of surface pretreatment and luting cement for two-unit CoCr cantilever resin-bonded bridges.


METHODS
Tensile peel, load and torque strength tests were performed using flat ground bovine teeth as substrate, four different commercially available luting cements, and CoCr beams as simulated cantilever resin-bonded bridges. The CoCr beams were pretreated with sandblasting or Rocatec. Tensile peel, load and torque strengths were determined 72h after cementation. The effects of sandblasting and Rocatec pretreatments on the morphology of the CoCr surface was investigated with SEM and EDAX analysis.


RESULTS
The average strengths of the three tests showed that Rely X ARC, Resiment and Panavia were the same and significantly lower than UniFix. Rocatec showed a significantly higher average bond strength than sandblasting considering all tests. The peel test, which showed the lowest failure values, is clinically the most relevant test. This test showed that only UniFix as luting cement with sandblasting as pretreatment generates a significantly higher bond strength compared with the other cements and pretreatments.


CONCLUSIONS
Based on the results of this study the use of Unifix with sandblasting as metal surface pretreatment, is preferred for cementation of two-unit CoCr cantilever resin-bonded bridges.
van Dalen
Andy
A
Department of Dental Materials Science, Academic Centre for Dentistry, Louwesweg 1, 1066 EA Amsterdam, The Netherlands. a.dalen@acta.nl
Feilzer
Albert J
AJ
Kleverlaan
Cornelis J
CJ
D000537:Aluminum Oxide; D000704:Analysis of Variance; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D001896:Boron Compounds; D002417:Cattle; D002484:Cementation; D002858:Chromium Alloys; D003743:Dental Enamel; D003799:Dental Stress Analysis; D016379:Denture, Partial, Fixed, Resin-Bonded; D004577:Electron Probe Microanalysis; D008422:Materials Testing; D008689:Methacrylates; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength; D019415:Torque
D001896:Boron Compounds; D002858:Chromium Alloys; D008689:Methacrylates; D008768:Methylmethacrylates; C438843:Panavia-Fluoro; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C079576:Resiment resin luting agent; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C049495:Super-bond; D000537:Aluminum Oxide