Bond strength of luting cements to zirconium oxide ceramics.
OBJECTIVE
This study was conducted to determine the bond strength of some resin luting cements to zirconia ceramic. The hypothesis was that adhesive bonding capacity is influenced by different surface pretreatments designed for milled ceramic inlays.


METHODS
Composite cylinders 5 mm x 5 mm were light cured on the ceramic surfaces for a shear test conducted in a test jig. Five surface treatments were studied: as received (from the milling machine), sandblasting with either 250- or 50-micron alumina sand, hydrofluoric acid treatment, and grinding with diamond burs. The tested luting cements were Panavia 21, Twinlook, and Superbond C&B.


RESULTS
All debonding occurred at the interface between ceramic and composite cement. Superbond demonstrated the highest bond strength regardless of the surface treatments. Grinding the surface with diamond burs improved the bonding slightly for Twinlook and Panavia 21 and also showed the roughest texture. Washing with hydrofluoric acid had no significant influence on bond strength.


CONCLUSIONS
Bond strengths for Twinlook and Pananvia 21 were quite low, and only Superbond showed a bond strength reasonably acceptable for clinical use; however, as no standard for bond strength has been established for inlay therapy, the other cements cannot be rejected as luting cements for inlays.
Dérand
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Public Dental Service, Norberg, Sweden. per.derand@sala.mail.telia.com
Dérand
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D000134:Acid Etching, Dental; D000268:Adhesiveness; D000537:Aluminum Oxide / Q000737:chemistry; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003775:Dental Polishing / Q000295:instrumentation; D018130:Diamond; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D007284:Inlays; D008027:Light; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
D001896:Boron Compounds; D003188:Composite Resins; D003738:Dental Cements; D008689:Methacrylates; D008768:Methylmethacrylates; C093719:Panavia TPN-S; D010710:Phosphates; D019279:Resin Cements; C076811:Rocatec; C086630:TwinLook cement; D017438:Bisphenol A-Glycidyl Methacrylate; D018130:Diamond; C049495:Super-bond; D015040:Zirconium; D000537:Aluminum Oxide; D006858:Hydrofluoric Acid; C028541:zirconium oxide