Author(s):
1. Valentina Veselinović, University of Banja Luka, Medical Faculty, Republic of Srpska, Bosnia and Herzegovina
2. Nataša Trtić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
3. Tijana Adamovic, University of Banja Luka, School of Medicine, Dentistry Study Program, Republic of Srpska, Bosnia and Herzegovina
4. Olivera Dolić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
5. Radmila Arbutina, University of Banja Luka, School of Medicine, Dentistry Study Program, Republic of Srpska, Bosnia and Herzegovina
6. Nataša Knežević, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
7. Slava Sukara, University of Banja Luka, School of Medicine, Dentistry Study Program, Republic of Srpska, Bosnia and Herzegovina

Abstract:
Antiseptic and chemical plaque control agents are a very common part of periodontal disease therapy, as well as part of the treatment after fixed prosthetic rehabilitations. These antiplaque agents , due to their chemical content, can lead to discoloration and compromise the aesthetics of restorative materials. The aim of this study is to investigate the color stability of two types of hybrid nanoceramic materials after exposure to two different plaque control agents: 0.2% Chlorhexidine digluconate (CHX) and Listerine®. MATERIAL AND METHOD: A total of 60 samples (Group A -30 Cerasmart GC and Group B - 30 Lava ™ Ultimate CAD / CAM Restorative) samples (10 mm X 2 mm discs) were prepared. Groups A and B were divided into three subgroups (n = 10). Samples were immersed in distilled water (control group), CHX or Listerine, once daily for 3 minutes. 7 days after immersion, the samples were washed with distilled water, and subjected to color measurement. Evaluation of the color and its change was performed with a SpectroShade, Micro, MHT, Verona, Italy spectrophotometer and through the CIELab (Commission Internationale de l'Eclairage) system. The color change (ΔE * ab) was determined based on CIE L *, a *, and b *. All results were statistically processed using Mann-Whitney and Kruskal-Wallis tests. RESULT: Color change was registered with all experimental groups. The ΔE * ab values were changed after immersion in CHX and Listerine® in both sample groups (CeraSmart and VitaEnamic), but with no statistically significant difference (p <0.001). No statistically significant difference was found after immersion of the samples in distilled water. The ΔE values were highest after immersion in CHX, followed by Listerine® and distilled water. CONCLUSION: Chemical control plaque agents can cause discoloration of nanohybrid ceramic materials, thereby compromising aesthetics. Additional Caution should be exercised when using mouthrinse antiseptic agents.

Key words:
color,spectrophotometer,CIE lab,chlorhexidine,hybrid nanoceramics,Listerine,color stability

Thematic field:
SYMPOSIUM B - Biomaterials and nanomedicine

Date of abstract submission:
12.08.2019.

Conference:
Contemporary Materials 2019 - Savremeni Materijali