Open AccessINFLUENCE OF DIFFERENT BLEACHING SYSTEMS ON THE BOND STRENGTH OF LAMINATE VENEER TO ENAMEL
Author(s) -
Özgün Yusuf Özyılmaz,
Filiz Aykent,
Ali Rıza Tunçdemir,
Haluk Barış Kara
Publication year - 2018
Publication title -
international journal of clinical and biomedical research
Language(s) - English
Resource type - Journals
eISSN - 2521-0394
pISSN - 2395-0471
DOI - 10.31878/ijcbr.2018.42.01
Subject(s) - enamel paint , bond strength , veneer , dentistry , dentin , materials science , post hoc , universal testing machine , ceramic , crown (dentistry) , hydrogen peroxide , composite material , chemistry , ultimate tensile strength , medicine , adhesive , organic chemistry , layer (electronics)
Purpose: The objective of this in-vitro study was to examine the microtensile bond strength of a porcelain laminate veneer (PLV) to tooth surface bleached with photoactivation by blue light-emitting diode (LED) or diode laser. Methods: Eigthteen extracted human central incisors were randomly divided into three groups. Two sticks were obtained from each tooth (n=12). Before surface treatments; teeth were prepared to provide space for PLVs. The first group teeth were bleached with Whiteness HP which is contain 35% hydrogen peroxide (HP) and then photoactivated with a LED for 20 seconds. The second group were bleached with Laserwhite 20 which is contain 46% HP and photoactivated with a diode laser for 30 seconds. The third group received no surface treatment and served as the control group. IPS Esthetic ceramic veneers were luted with Variolink II veneer cement . The teeth were sectioned to obtain porcelain-resin-enamel/dentin sticks and submitted to a MTB testing device. The maximum load at fracture was recorded. Data were analyzed using one-way ANOVA followed by the Tukey HSD post-hoc test at a preset α of 0.05. Results: One-way ANOVA revealed that there was significant difference between LED unit group and control group (p .05) The LED unit group presented significantly lower bond strength value (6.49±2.3 MPa) than diode laser (8.49 ±3.1 MPa) and control groups (9.53±2.7 MPa). Conclusion: The results suggested that bleaching therapy with activation by LED or diode laser reduced the bond strength of IPS Esthetic ceramic veneers to tooth surfaces.
Keywords: Teeth Bleaching; Photoactivation; Semiconductor lasers; Diode laser; Microtensile.