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Effect of Delayed Bonding and Antioxidant Application on the Bond Strength to Enamel after Internal Bleaching
Author(s) -
Kılınç Halil İbrahim,
Aslan Tuğrul,
Kılıç Kerem,
Er Özgür,
Kurt Gökmen
Publication year - 2016
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12303
Subject(s) - enamel paint , bond strength , sodium ascorbate , adhesive , dentistry , materials science , universal testing machine , cementation (geology) , composite material , dental bonding , shear strength (soil) , buccal administration , cement , chemistry , ultimate tensile strength , medicine , food science , environmental science , layer (electronics) , soil water , soil science , ascorbic acid
Purpose This study evaluated the effect of delayed bonding and antioxidant application (AA, 10% sodium ascorbate) after internal bleaching (35% carbamide peroxide) on the shear bond strength of an adhesive cement to enamel. Materials and Methods Eighty‐four human maxillary central incisors were endodontically treated. The control group remained unbleached with no AA. Experimental groups were all internally bleached. The buccal enamel was finished and polished with metallographic paper to a refinement of #600, in order to obtain a 5‐mm 2 flat bonding area. An adhesive cement (Clearfil Esthetic) was placed into a plastic tube with internal diameter of 3 mm and a 3‐mm height and cured on the enamel. Bonding occurred either immediately after bleaching (group Im), a 7‐day delay (group 7), or a 14‐day delay (group 14), and half the specimens were treated with antioxidant application (groups Im‐AA, 7‐AA, and 14‐AA). Shear bond strength testing was performed on a universal testing machine, and data were analyzed with ANOVA and Fisher test (5%). Results Delaying of bonding is a useful factor for enhancing shear bond strength ( p < 0.05), whereas AA only enhanced shear bond strength after 7 days delayed bleaching ( p < 0.05). The highest bond strength was noted in groups 7‐AA (20.51 ± 4.5 MPa), 14 (19.82 ± 4.6), 14‐AA (20.27 ± 4.4), and control (20.51 ± 5.1), which were not significantly different from each other. Conclusions After internal bleaching, adhesive cementation to enamel is recommended only when delayed 14 days, or delayed 7 days with sodium ascorbate application.