ABSTRACT
This study compared the shear bond strength of four filled dentin bonding agents (Prime & Bond NT, One Coat Bond, OptiBond Solo, PermaQuik1) to a conventional unfilled Dentin Bonding agent (3M Scotchbond Multipurpose Plus). A column of composite resin (Herculite XRV Restorative Resin) was bonded to human dentin using the five dentin-bonding systems following the manufacturers' directions. The specimens were thermocycled 1000 cycles from 6 to 60 degrees C. Each specimen was tested on an MTS machine in shear-to-failure. The data were subjected to One-Factor ANOVA and Newman-Kuels post-hoc tests. Statistical analysis revealed that One Coat Bond had significantly greater shear bond strength than all other materials tested.
Subject(s)
Dental Bonding , Dentin-Bonding Agents/chemistry , Analysis of Variance , Bisphenol A-Glycidyl Methacrylate/chemistry , Composite Resins/chemistry , Dental Stress Analysis/instrumentation , Dentin/ultrastructure , Humans , Materials Testing , Polymethacrylic Acids/chemistry , Resin Cements/chemistry , Statistics as Topic , Stress, Mechanical , ThermodynamicsABSTRACT
This study compared the shear bond strength of four adhesives dispensed 10 minutes prior to use to immediate dispensing and use. For half (40) of the specimens (n = 10), four different dentin bonding agents (One Coat, Bisco One Step, Prime & Bond 2.1 and 3M Single Bond) were used to bond a column of composite resin (Z100 Restorative Resin) to the dentin surface following manufacturers' directions and using the dentin bonding agent immediately after dispensing. For the remaining specimens, the same procedure was followed except that the dentin-bonding agent was dispensed 10 minutes prior to use. All specimens were tested two weeks after bonding on a MTS machine. The data obtained was subjected to Two-factor ANOVA and Tukey-B post-hoc tests. The statistical analysis showed that there was no significant difference between the control groups and the experimental groups, although the dentin bonding agents containing acetone showed a trend toward lower bond strengths when not used immediately after dispensing.
Subject(s)
Dental Bonding , Dentin-Bonding Agents/chemistry , Silicon Dioxide , Zirconium , Acetone/chemistry , Analysis of Variance , Bisphenol A-Glycidyl Methacrylate/chemistry , Composite Resins/chemistry , Dental Stress Analysis/instrumentation , Dentin/ultrastructure , Humans , Materials Testing , Methacrylates/chemistry , Polymethacrylic Acids/chemistry , Statistics as Topic , Stress, Mechanical , Time FactorsABSTRACT
PURPOSE: To compare the ability of three packable resin-based composite (RBC) systems (ALERT, SureFil, and Solitaire), placed and light-cured in either incremental layers or in bulk, to seal the gingival margin of Class II preparations when the gingival margin is placed apical to the cementoenamel junction. MATERIALS AND METHODS: Packable RBCs were used to restore 60 extracted human premolars with Class II preparations using an incremental-cure technique (each layer no greater than 2 mm in thickness when light-cured) or a bulk-cure technique (n=10). Manufacturers' directions were followed; the cure technique was the only variable. After the restorations were completed, the specimens were thermocycled, stained, sectioned, and viewed under a light microscope for microleakage at the gingival margin. RESULTS: All specimens showed leakage at the gingival margin. No statistically significant difference was found between the bulk-cure and incremental-cure techniques for each of the RBC systems evaluated. ALERT had significantly less leakage than SureFil and Solitaire.
Subject(s)
Composite Resins/chemistry , Dental Leakage/classification , Dental Marginal Adaptation , Dental Restoration, Permanent/classification , Acid Etching, Dental , Bicuspid , Coloring Agents , Dental Cavity Preparation/classification , Dental Restoration, Permanent/methods , Dentin-Bonding Agents/chemistry , Gingiva , Humans , Light , Statistics, Nonparametric , Thermodynamics , Tooth CervixABSTRACT
PURPOSE: To compare the shear bond strength of four single-bottle adhesive systems (Prime & Bond NT, Single Bond, Gluma Comfort Bond, Gluma Comfort Bond + Desensitizer) bonded to moist and dry dentin. MATERIALS AND METHODS: A column of resin-based composite was bonded to human dentin using the dentin bonding systems following manufacturers' directions (n= 12). For half the specimens, the dentin was dried completely after acid etching (air dried for 10 s). For the remaining specimens, the dentin was left moist (glistening appearance with no puddles) after acid etching. All specimens were thermocycled for 1,000 cycles at 6-60 degrees C, placed in a fixture on an MTS machine and loaded in shear until failure. RESULTS: Statistical analysis revealed that dentin condition (moist or dry) was significant for Prime & Bond NT, Single Bond, and Gluma Comfort Bond. Bonding to moist dentin produced higher bond strengths than bonding to dry dentin. For Gluma Comfort Bond + Desensitizer, no statistical difference was found between bonding to moist vs. dry dentin. Over all, Single Bond and Gluma Comfort Bond bonded to moist dentin produced significantly higher bond strengths than all other groups.
