Author(s):
1. Nataša Knežević, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
2. Zeljka Kojic, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
3. Olivera Dolić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
4. Marija Obradović, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
5. Slava Sukara, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
6. Aleksandra Đeri, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina

Abstract:
INTRODUCTION: High concentrations of hydrogen peroxide are used for office bleaching vital teeth. The bleaching gel can be activated by chemical means, heat or light. Light activation of the bleaching agent accelerates the decomposition of hydrogen peroxide to the active oxygen and increases the bleaching efficiency. The aim of this study is to evaluate the in vivo efficacy of hydrogen peroxide gel used for in-office bleaching, with chemical and light activation. MATERIALS AND METHODS: The study involved 20 systematically healthy patients with good oral hygiene, no carious lesions, no large composite fillings in the frontal region, and no gingivitis. The color of the teeth was assessed by color key Shade Guide Ivoclar A-D, for all patients. We used a bleaching agent of 38% hydrogen peroxide (Pola office plus, SDI, Australia) in two sessions for 10 patients. The application of the gel during one session was performed two times in eight minutes. For the light activation, we used LED (Easy Lamp Plus, Signal) and 38% hydrogen peroxide (Signal Professional set) for 10 patients. During one session, the teeth are bleached twice in 12 minutes. A dark-light scale was used where each shade was assigned a number from 1 to 20, so that a statistical analysis of the data could be performed. Number one corresponds to the brightest color (BL1) while number 20 corresponds to the darkest color (C4). After the bleaching process, the color of the teeth was determined again. RESULTS: Results showed that in office bleaching technique with chemical activation had a color change for four shades after the first treatment and in the second session had a color change for three shades. The results showed that in the office bleaching technique with light activation also had a color change after the first treatment for four shades and in the second session had a color change for three shades. Comparing the success of in the office bleaching technique without light activation and bleaching techniques with LED activation, it can be noticed that there is no statistically significant difference in the bleaching efficacy of these two techniques. CONCLUSION: Both bleaching techniques showed the same efficacy in the bleaching process.

Thematic field:
SYMPOSIUM B - Biomaterials and nanomedicine

Date of abstract submission:
03.07.2019.

Conference:
Contemporary Materials 2019 - Savremeni Materijali