Changes in Optical Characteristics and Surface Topography of CAD/CAM Materials after Bleaching Applications: An AFM Evaluation
Cengiz Yanardag, Esra
Purpose: To evaluate the effect of in-office and at-home bleaching agents on color changes (ΔE00 ), translucency (TP00 ), whiteness (WID ), surface roughness (Ra ), and surface topography (Rsk and Rku ) 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). ΔE00 values were calculated before and after bleaching procedures with a spectrophotometer using the CIEDE2000 formula. ΔTP00 and ΔWID values w...
Effect of 2 Bleaching Agents with a Content of High Concentrated Hydrogen Peroxide on Stained 2 CAD/CAM Blocks and a Nanohybrid Composite Resin: An AFM Evaluation
Cengiz Yanardag, Esra
The aim of this study was to evaluate color stability of 3 restorative materials, discoloration ability of different solutions, efficacy of 2 office bleaching agents, and surface roughness and topography. Sixty specimens for Clearfil Majesty Esthetic (CME), Lava Ultimate (LU), and Vita Enamic (VE) were prepared. They were immersed into 3 staining solutions for 2 weeks and then they were bleached. According to the measured L⁎, a⁎, and b⁎ parameters described by CIELAB system, color changes (ΔE00), translucency parameters (TP), whiteness index values (W⁎), and changes in closeness to pure white (ΔW⁎) were calculated. Then 3 specimens from each group were scanned with an atomic force microscope for surface analysis. After staining, CME groups and control groups of LU and VE showed clinically ...
Effects of Staining Beverages and Office Bleaching Agents on the Optical Characteristics and Surface Topography of Maxillary Incisor Teeth
Cengiz Yanardag, Esra
BACKGROUND/AIMS: The aim of this study was to evaluate the staining abilities of different beverages, the efficacy of two office bleaching agents and the effect of bleaching on the surface topography of maxillary incisors. MATERIALS AND METHODS: Sixty crowns of maxillary incisors were obtained and immersed in distilled water for 24 hours. After baseline color measurements were made, the specimens were divided into three groups according to three immersion solutions [Turkish coffee (TC), red wine (RW), and distilled water (DW)]. At the end of the staining period, color measurements were repeated and then the specimens of each group were divided into two subgroups and Perfect Bleach Office+ (PBO+) or Opalescence Boost (OB) were applied. After bleaching, the color measurements were recorde...
The effect of home bleaching agents on the surface roughness of five different composite resins: A SEM evaluation
Cengiz Yanardag, Esra
The aim of this study was to investigate the effect of hydrogen peroxide (HP) and carbamide peroxide (CP) on the surface roughness of five different composite resins using profilometer and scanning electron microscope (SEM). Thirty-six specimens (1 mm thick, 10 mm in diameter) of five composite resins were fabricated. Each composite group was equally divided into three subgroups as control, CP and HP. In control group, specimens were stored in daily refreshed distilled water during the 14-day testing period. In other groups, 10% HP (Opalescence Treswhite) and 10% CP (Opalescence PF) were applied and surface roughness values (Ra) of each specimen were measured with a profilometer at the end of 14 days. Additionally, SEM analysis was performed to evaluate the surface deformations of composit...