Effect of surface treatment on fatigue behaviour between Tetric Ceram inlays and Variolink luting composite.
The effect of pre-treatment of composite inlays on bonding performance between a resin composite inlay and a luting composite has not been fully studied. The aim of the present study was to evaluate the influence of three different pre-treatment modes on fatigue bond strength and marginal adaptation. One hundred twenty resin composite discs (Tetric Ceram) were made as simulated inlays and randomly assigned to four groups (n=30): Without treatment (WT), hydrofluoric acid etching for 15 s + silanating (HF), roughening with a silicon carbide bur (SC), and silica coating + silanating (CO). Luting composite cylinders (Variolink II low) were bonded to the discs using Heliobond, and after 24 h in water at 37 degrees C, quasistatic shear bond strengths (n=l) and fatigue bond strengths (n=20; 5,000 cycles) were measured. Thirty-two third molars received occlusomesial Class II cavities (n=8), and direct resin composite inlays were luted with identical methods and materials. Before and after thermomechanical loading (100,000x50 N, 2,500 x +5 degrees C/+55 degrees C), replicas were made and examined (SEM, x200). CO and SC exhibited significantly higher bond strengths and adhesive fatigue limits than HF and WT (P<0.05). After thermomechanical loading, CO (98% continuous margin) and SC (95% continuous margin) demonstrated that they provide significantly more fatigue resistance than HF (88%).
Frankenberger
R
R
Polyclinic for Operative Dentistry and Periodontology, University of Erlangen-Nuermberg, Erlangen, Germany.
Strobel
W O
WO
Baresel
J
J
Trapper
T
T
Krämer
N
N
Petschelt
A
A
D000134:Acid Etching, Dental; D000179:Acrylates / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003738:Dental Cements / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D007284:Inlays; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008963:Molar; D016628:Replica Techniques; D019279:Resin Cements / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D000179:Acrylates; D000180:Acrylic Resins; D017554:Carbon Compounds, Inorganic; D003188:Composite Resins; D003738:Dental Cements; D019279:Resin Cements; D012821:Silanes; D017655:Silicon Compounds; C121818:Tetric ceram; D014867:Water; C103502:Variolink; D012822:Silicon Dioxide; C040415:heliobond; D006858:Hydrofluoric Acid; C022088:silicon carbide