IADR Abstract Archives
Bond Strength of a Universal-Adhesive to Bleached & Desensitized Enamel
Objectives: To evaluate the effect of different desensitizing agents on the bond strength of a universal adhesive system to the bleached enamel.
Methods: Fifty enamel surfaces were obtained from the buccal surfaces of extracted human non-carious mandibular incisors. The specimens were embedded in acrylic resin and the surfaces were ground flat with 600, 1000, 2500 and 4000 grits of SiC papers. Teeth were randomly divided in five experimental groups (n=10):
(1) No bleaching agent and desensitizer were applied (control group),
(2) Office-Bleaching (Total Blanc Office Dental Whitening 35% Hydrogen-Peroxide/DFL),
(3) Office-Bleaching + Desensitizing Agent (DA) (Potassium nitrate&Fluoride/UltraEZ, Ultradent),
(4) Office-Bleaching + DA (Hydroxyapatite & Potassium nitrate/ExSense, Cavex),
(5) Office-Bleaching + DA (Hydroxyapatite/Teethmate Desensitizer, Kuraray).
Composite cylinders (Clearfil Majesty ES-2 Premium A1, Kuraray) were bonded using a jig with universal adhesive (Clearfil Universal Bond, Kuraray) regard to total-etch procedure after 14 days. After storing specimens in distilled water 24 hours, the shear bond strengths (SBS) (MPa) were examined using a universal testing device at a crosshead speed of 1 mm/min. Failure mode distribution was also evaluated. Kruskal-Wallis and Conover Dunn tests, with a significance level of p=0.05, were used for data analysis.
Results: The highest mean shear bond strength value was observed in Group 4 (13.70±5.08) where as the lowest bond strength value was observed in Group 5 (7.80±3.88). A significant difference was seen only between group 4 and 5 (p=0.049). The failure modes were mainly adhesive for all of the groups (100% for Group1, 4, 5, 90% for Group 2, and 80% for Group 3) The failure mode distributions among the groups were similar (p>0.05).
Conclusions: Application of desensitizers after office bleaching could hamper the bond strength of universal adhesive to enamel.
Methods: Fifty enamel surfaces were obtained from the buccal surfaces of extracted human non-carious mandibular incisors. The specimens were embedded in acrylic resin and the surfaces were ground flat with 600, 1000, 2500 and 4000 grits of SiC papers. Teeth were randomly divided in five experimental groups (n=10):
(1) No bleaching agent and desensitizer were applied (control group),
(2) Office-Bleaching (Total Blanc Office Dental Whitening 35% Hydrogen-Peroxide/DFL),
(3) Office-Bleaching + Desensitizing Agent (DA) (Potassium nitrate&Fluoride/UltraEZ, Ultradent),
(4) Office-Bleaching + DA (Hydroxyapatite & Potassium nitrate/ExSense, Cavex),
(5) Office-Bleaching + DA (Hydroxyapatite/Teethmate Desensitizer, Kuraray).
Composite cylinders (Clearfil Majesty ES-2 Premium A1, Kuraray) were bonded using a jig with universal adhesive (Clearfil Universal Bond, Kuraray) regard to total-etch procedure after 14 days. After storing specimens in distilled water 24 hours, the shear bond strengths (SBS) (MPa) were examined using a universal testing device at a crosshead speed of 1 mm/min. Failure mode distribution was also evaluated. Kruskal-Wallis and Conover Dunn tests, with a significance level of p=0.05, were used for data analysis.
Results: The highest mean shear bond strength value was observed in Group 4 (13.70±5.08) where as the lowest bond strength value was observed in Group 5 (7.80±3.88). A significant difference was seen only between group 4 and 5 (p=0.049). The failure modes were mainly adhesive for all of the groups (100% for Group1, 4, 5, 90% for Group 2, and 80% for Group 3) The failure mode distributions among the groups were similar (p>0.05).
Conclusions: Application of desensitizers after office bleaching could hamper the bond strength of universal adhesive to enamel.