Banca de DEFESA: JESSIKA RAISSA MEDEIROS DE ALMEIDA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JESSIKA RAISSA MEDEIROS DE ALMEIDA
DATA : 06/12/2018
HORA: 16:00
LOCAL: Departamento de Odontologia
TÍTULO:

EVALUATION OF SUPERFICIAL ROUGHNESS AND SURFACE TOPOGRAPHY OF BULK FILL, CONVENTIONAL AND FLOW COMPOSITES BEFORE AND AFTER SIMULATED TOOTHBRUSHING

PALAVRAS-CHAVES:

Surface properties, scanning electronic microscopy, wear.

PÁGINAS: 38
GRANDE ÁREA: Ciências da Saúde
ÁREA: Odontologia
SUBÁREA: Materiais Odontológicos
RESUMO:

Introduction: The increasing of the aesthetic exigency by the patients and the continual development of materials – such as bulk fill and flow composites, demands a crescent need of studies on this area to evaluate the properties of the materials when submitted to the wear occasioned by toothbrushing abrasion over time. Objective: To evaluate the surface characteristics of restorations performed before and after the process of simulated toothbrushing and to compare the results between the composites. Materials and methods: In total, 80 samples were made (7x4mm), being 20 to each type of resin utilized, color A1: Bulk Fill One (3M/ESPE, St. Paul, MN, USA), Bulk Fill Flow (3M/ESPE, St. Paul, MN, USA), Z350XT 3M/ESPE St. Paul, MN, USA) and Z350XT Flow (3M/ESPE, St. Paul, MN, USA). After the confection of the specimens, the samples were immersed in distilled water for 24 hours and stored at 37°C in stove, moment that was performed the finishing and polishing with the sequence of sandpaper discs (TDV, Brasil). Half of the specimens was submitted to 60,000 cycles of simulated toothbrushing, meanwhile the other half was the control group (n=10). The surface of the restorations was evaluated through Scanning Electronic Microscopy (SEM), surface roughness (Ra), and weight loss (through measurements), in two moments: before and after the process of simulated toothbrushing. To the statistical analysis, it was used the variance analysis ANOVA two factors and Tukey’s post test. Results: In the analysis performed by SEM, in amplification of 500x, it was observed the presence of medium and small protruding particles in all resins tested after simulated toothbrushing, with exception of the resin Z350 flow. All materials presented increasing on Ra after simulated toothbrushing. Regarding to mass variation, all materials presented mass loss after simulated toothbrushing, suggesting that wear of the restoration structure. Conclusion: To sum up, there is still a concern about whether the wear is most influenced by the type of dentifrice or by the proprieties of the material itself. 

MEMBROS DA BANCA:
Presidente - 2966816 - MARILIA REGALADO GALVAO RABELO CALDAS
Externo ao Programa - 1247082 - DIANA FERREIRA GADELHA DE ARAUJO
Externo à Instituição - ANA KARINA MACIEL DE ANDRADE - UFPB