A preliminary report on short-term clinical outcomes of three-unit resin-bonded fixed prostheses using two adhesive cements and surface conditioning combinations.
OBJECTIVE
The aim of this study was to evaluate the survival rate of three-unit surface-retained, resin-bonded, metal-ceramic fixed dental prostheses (RBFDP) using two adhesive cements and two surface conditioning methods.


METHODS
Between 2005 and 2009, a total of 58 patients (34 women, 24 men; mean age: 42.1 years) received 58 three-unit RBFDPs made of a nonprecious alloy (Wirocast Co-Cr). Restorations were cemented employing the following combinations: (1) alumina air abrasion-silane + Panavia F 2.0 (group A1), (2) tribochemical silica coating (CoJet)-silane + Panavia F 2.0 (group A2), (3) alumina air abrasion-silane + Super-Bond C and B (group B1), and (4) CoJet-silane + Super-Bond C and B (group B2). Teeth were conditioned using the adhesives of the cements accordingly. Adaptation, debonding, fracture, and crack and caries formation were considered for clinical evaluation. Data were collected at baseline, 6 months, and annually thereafter. Forty-eight RBFDPs were available for follow-up (mean: 20.3 months, minimum: 6 months, maximum: 42 months).


RESULTS
The effect of cement type on the survival rate of RBFDPs was not significant (P > .05). The survival rate was also not significantly affected by the location (maxilla: 93.2%, mandible: 92.9%; P = .928). All experienced failures were observed within the first year after cementation. In total, four complete debondings were encountered (two in group A1, one in group A2, and one in group B1 at months 1, 3, 7, and 3, respectively). Group B2 did not result in any failures during the observation period. The failures were adhesive debondings between the metal surface and the cement.


CONCLUSIONS
Early findings did not show significant differences between the cement and conditioning type combinations, with group B2 presenting no failures.
Dündar
Mine
M
Department of Prosthodontics, Ege University, School of Dentistry, Bornova, Izmir, Turkey. minedundar@yahoo.com
Ozcan
Mutlu
M
Cömlekoğlu
M Erhan
ME
Güngör
Mehmet Ali
MA
D000328:Adult; D000537:Aluminum Oxide / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003731:Dental Caries / Q000209:etiology; D003738:Dental Cements / Q000737:chemistry*; D045662:Dental Etching / Q000379:methods*; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003779:Denture Design; D016379:Denture, Partial, Fixed, Resin-Bonded; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D016876:Metal Ceramic Alloys / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
D001896:Boron Compounds; D002858:Chromium Alloys; D003738:Dental Cements; D016876:Metal Ceramic Alloys; D008689:Methacrylates; D008768:Methylmethacrylates; C438843:Panavia-Fluoro; D019279:Resin Cements; D012821:Silanes; D012822:Silicon Dioxide; C049495:Super-bond; D000537:Aluminum Oxide