ABSTRACT
To determine the shear bond strength of 10 self-etching adhesive systems to dentin and enamel, flat bonding sites were prepared on 216 extracted human molar teeth, using 600-grit silicon carbide paper to expose dentin or enamel. Following the application of each adhesive system, bonded assemblies of Spectrum TPH were prepared using a gelatin capsule matrix (n = 24). After 24 hours of storage in water at 37 degrees C, 12 specimens from each enamel and dentin group were debonded. This was followed by thermocycling for 6,000 cycles between water baths at 5 degrees C and 55 degrees C, with a dwell time of 20 seconds in each bath. Specimens were loaded to failure in a testing machine with a crosshead speed of 5 mm/minute. Statistical analysis included a one-way ANOVA and least square difference post hoc test. There were significant differences in shear bond strength for both enamel and dentin among the materials tested (p < 0.05).
Subject(s)
Acid Etching, Dental/methods , Dental Bonding , Dentin-Bonding Agents/chemistry , Resin Cements/chemistry , Analysis of Variance , Composite Resins , Dental Bonding/methods , Dental Enamel , Dental Stress Analysis , Dentin , Humans , Least-Squares Analysis , Materials Testing , Shear StrengthABSTRACT
Contemporary adhesive systems and restorative composite materials can successfully seal and restore teeth and can facilitate the use of a minimally invasive cavity preparation technique. These systems give the operator the potential to reinforce damaged teeth and preserve healthy tooth structure. The adhesion principles rely on strict adherence to excellence in clinical technique. Differences in clinical results may depend may more on the operator's adherence to good clinical technique than the specific material selected.
Subject(s)
Dental Bonding/methods , Dental Caries/therapy , Dental Cavity Preparation/methods , Dental Restoration, Permanent/methods , Resin Cements/therapeutic use , Dental Caries/diagnosis , HumansABSTRACT
PURPOSE: To determine the shear bond strength to dentin of five newer-generation self-etching adhesive systems. METHOD AND MATERIALS: Flat bonding sites were prepared on 100 extracted human molar teeth with 600-grit silicon carbide paper, which exposed the dentin. The systems tested were: Clearfil SE Bond; Optibond Solo Plus Self-Etch; Xeno CF III; Tyrian SPE; and Adper Prompt L-Pop. Following application of each adhesive system, bonded assemblies of Z-100 were prepared using a gelatin capsule matrix (n = 20). Ten specimens in each group were debonded after water storage for 24 hours at 37 degrees C, and 10 were stored for at least 30 days, followed by thermocycling for 850 cycles between water baths at 5 degrees C and 55 degrees C, with a dwell time of 1 minute in each bath. Specimens were loaded to failure in an Instron Model 1123 testing machine with a crosshead speed of 5 mm/min. Statistical analysis included a two-way analysis of variance (adhesive and time) and Tukey's post hoc test. RESULTS: Mean shear bond strengths (MPa) at 24 hours were: Clearfil, 26.4+/-4.2; Optibond, 23.5+/-4.4; Xeno, 19.5+/-4.2; Tyrian, 16.5+/-3.7; and Adper, 15.3+/-3.3. Mean shear bond strengths (MPa) after storage and thermocycling were: Optibond, 27.5+/-5.7; Clearfil, 25.5+/-4.9; Adper, 21.5+/-3.3; Xeno, 20.4+/-2.2; and Tyrian, 19.2+/-6.4. Both adhesive system and storage time were significant factors affecting shear bond strength (P < .05). CONCLUSION: There are significant differences in the in vitro dentin shear bond strength among the self-etching adhesive materials tested. Water storage and thermocycling did not significantly degrade the shear bond strength of the materials in this study.
