Banca de QUALIFICAÇÃO: WANDERSON TALLES DO NASCIMENTO PEREIRA SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : WANDERSON TALLES DO NASCIMENTO PEREIRA SANTOS
DATE: 23/06/2022
TIME: 10:00
LOCAL: PLATAFORMA REMOTA
TITLE:

Influence of tooth whitening on the surface hardness of three composite resins: An In Vitro Study

KEY WORDS:

Keywords: Microhardness; Composite resins; Tooth whitening.

PAGES: 20
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:

This study aims to evaluate in vitro the surface hardness of three polymerizable composite resins (Filtek Z350 - 3M ESPE, Zirconfil - TECHNEW, Vitra - FGM), after a 40% hydrogen peroxide tooth bleaching process. 60 specimens were made, 20 specimens of each restorative material (n=20). After the finishing and polishing process, the specimens were randomly divided into two groups for each restorative material (n=10), where the control group G1 was maintained in artificial saliva and the test group G2 was subjected to bleaching gel based on of 40% hydrogen peroxide according to the manufacturer's instructions. For each specimen, four consecutive and equidistant readings were performed, with a load of 300g of force for 15s. Hardness values for tested resins were correspondingly higher in the control group than in the test group. The biggest difference in the mean values between the groups occurred in the Z350XT resin and for the fixed margin of error (5%) a significant difference (p < 0.05) between the test and control groups for each resin. The hypothesis tested in this test was null, since there were significant changes between the hardness of the control group and the test group, thus showing that the bleaching gel altered the hardness of the tested resins.

BANKING MEMBERS:
Presidente - 2292784 - ISAUREMI VIEIRA DE ASSUNCAO
Externa ao Programa - 3275793 - ISABELA DANTAS TORRES DE ARAÚJO
Externa à Instituição - Marília de Lima Soares