Bond strength durability of a resin composite on a reinforced ceramic using various repair systems.
OBJECTIVE
This study compared the durability of repair bond strength of a resin composite to a reinforced ceramic after three repair systems.


METHODS
Alumina-reinforced feldspathic ceramic blocks (Vitadur-alpha) (N=30) were randomly divided into three groups according to the repair method: PR-Porcelain Repair Kit (Bisco) [etching with 9.5% hydrofluoric acid+silanization+adhesive]; CJ-CoJet Repair Kit (3M ESPE) [(chairside silica coating with 30microm SiO(2)+silanization (ESPE)-Sil)+adhesive (Visio-Bond)]; CL-Clearfil Repair Kit [diamond surface roughening, etching with 40% H(3)PO(4)+Clearfil Porcelain Bond Activator+Clearfil SE Bond)]. Resin composite was photo-polymerized on each conditioned ceramic block. Non-trimmed beam specimens were produced for the microtensile bond strength (microTBS) tests. In order to study the hydrolytic durability of the repair methods, the beam specimens obtained from each block were randomly assigned to two conditions. Half of the specimens were tested either immediately after beam production (Dry) or after long-term water storage (37 degrees C, 150 days) followed by thermocyling (12,000 cycles, 5-55 degrees C) in a universal testing machine (1mm/min). Failure types were analyzed under an optical microscope and SEM.


RESULTS
microTBS results were significantly affected by the repair method (p=0.0001) and the aging conditions (p=0.0001) (two-way ANOVA, Tukey's test). In dry testing conditions, PR method showed significantly higher (p<0.001) repair bond strength (19.8+/-3.8MPa) than those of CJ and CL (12.4+/-4.7 and 9.9+/-2.9, respectively). After long-term water storage and thermocycling, CJ revealed significantly higher results (14.5+/-3.1MPa) than those of PR (12.1+/-2.6MPa) (p<0.01) and CL (4.2+/-2.1MPa) (p<0.001). In all groups when tested in dry conditions, cohesive failure in the composite accompanied with adhesive failure at the interface (mixed failures), was frequently observed (76%, 80%, 65% for PR, CJ and CL, respectively). After aging conditions, while the specimens treated with PR and CJ presented primarily mixed failure types (52% and 87%, respectively), CL group presented mainly complete adhesive failures at the interface (70%).


CONCLUSIONS
Hydrolytic stability of the repair method based on silica coating and silanization was superior to the other repair strategies for the ceramic tested.
Ozcan
Mutlu
M
University Medical Center Groningen, Department of Dentistry and Dental Hygiene, Clinical Dental Biomaterials, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands. mutluozcan@hotmail.com
Valandro
Luiz Felipe
LF
Amaral
Regina
R
Leite
Fabiola
F
Bottino
Marco Antonio
MA
D000134:Acid Etching, Dental; D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D017269:Dental Prosthesis Repair / Q000379:methods*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D018130:Diamond / Q000737:chemistry; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry
D000538:Aluminum Silicates; C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; C076805:Clearfil Porcelain Bond; C438313:Clearfil SE Bond; C480092:Clearfil repair; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D010756:Phosphoric Acids; D017680:Potassium Compounds; D019279:Resin Cements; D012821:Silanes; C483027:vitadur alpha; D014867:Water; D003776:Dental Porcelain; C016447:feldspar; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D018130:Diamond; C081713:Visio-Bond; C030242:phosphoric acid; D000537:Aluminum Oxide; D006858:Hydrofluoric Acid