Premium
Changes in Optical Characteristics and Surface Topography of CAD/CAM Materials after Bleaching Applications: An AFM Evaluation
Author(s) -
Karakaya Izgen,
CengizYanardag Esra
Publication year - 2020
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.13134
Subject(s) - carbamide peroxide , ceramic , bleach , surface roughness , significant difference , opalescence , atomic force microscopy , materials science , color difference , composite material , chemistry , nuclear chemistry , dentistry , mathematics , nanotechnology , optics , computer science , medicine , statistics , enamel paint , organic chemistry , physics , filter (signal processing) , computer vision
Purpose To evaluate the effect of in‐office and at‐home bleaching agents on color changes (ΔE 00 ), translucency (TP 00 ), whiteness (WI D ), surface roughness (R a ), and surface topography (R sk and R ku ) of a resin nano‐ceramic and a polymer‐infiltrated ceramic network CAD/CAM material. Materials and Methods Sixty specimens (6 mm × 7 mm × 1.3 mm) were prepared from Lava Ultimate (LU) and Vita Enamic (VE). The specimens were divided into 6 groups according to the bleaching agents applied (n = 10/group): control, Perfect Bleach Office + (PBO), Opalescence Boost (OB), Perfect Bleach (PB) with 10% and 16% carbamide peroxide and Whiteness Perfect (WP). ΔE 00 values were calculated before and after bleaching procedures with a spectrophotometer using the CIEDE2000 formula. ΔTP 00 and ΔWI D values were calculated for each material. R a , R sk , and R ku values of the specimens were evaluated with an Atomic Force Microscope. Two‐way ANOVA was used for statistical analyses of the parameters measured after bleaching. For pairwise comparisons, Tukey test was performed. Results For LU, no statistically significant difference among the ΔE 00 values of the groups was observed ( p = 1.000). For VE, only WP group presented significantly higher values (2.12 ± 2.66) than the other groups ( p < 0.001). For both materials; ΔTP 00 values of at‐home bleaching groups were significantly higher than in‐office bleaching groups and control group ( p < 0.001). For VE, ΔWI D values did not demonstrate statistically significant difference ( p = 1.000); however, for LU, PBO applied group showed statistically higher ΔWI D values (3.00 ± 2.38) ( p = 0.010) and WP applied group showed lower ΔWI D values (0.47 ± 0.31) than the other groups ( p = 0.030). For both LU and VE, there was no statistically significant difference among the groups regarding Ra (F = 4.544), R sk (F = 2.369), and R ku values (F = 2.391) ( p = 1.000). All of the VE groups presented R a values higher than 0.2 µm. Conclusions The optical properties of LU and VE after bleaching applications were affected by the contact time with bleaching agents rather than concentration. Bleaching procedure had no effect on the surface properties of these materials.