Banca de DEFESA: CLARA JÉSSICA DE MEDEIROS SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CLARA JÉSSICA DE MEDEIROS SILVA
DATA : 30/10/2018
HORA: 08:30
LOCAL: Sala de aulas do PPGCEM
TÍTULO:
PALAVRAS-CHAVES:

Autopolymerizing dental acrylic resin, poly (methyl methacrylate), physical characterization, mechanical characterization, biodegradability

PÁGINAS: 81
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

Autopolymerizing dental acrylic resin is one of the most used materials for denture applications due to its easy manipulation, its physical and mechanical properties, its chemical stability and aesthetic appearance, its biocompatibility and the inherent low cost. The commercial product has two components: a powder solid containing pre-polymerised poly (methyl methacrylate) (PMMA) particles and a liquid containing the MMA monomer. Changes in the proportion of powder and liquid can occur, due to the working conditions of the places where the resin is handled, leading to modifications of the physical properties of this material. For this reason, the aim of this study was to evaluate the changes in the physical properties of the autopolymerizing dental acrylic resin as a function of the proportions of powder and liquid. The used materials were from three manufacturers, identified in this work as AM1, AM2 and AM3, and they were used in three different proportions: one recommended by the manufacturer of the material, one with the same concentration of powder and monomer and one with two parts more than than monomer. The materials were analysed and characterized by porosity, water absorption, contact angle, atomic force microscopy (AFM), Shore D hardness, Izod impact, scanning electron microscpy (SEM), biodegradability testing, and cell viability. Among the analyzed compositions, the AM3 in the AM3- group was the one that presented better properties, reaching higher than those according to the manufacturer's standard specifications. The advantage of this change is that the amount of material used in processing is lower, reducing purchase costs. Thus, even for compositions already available on the market, it was possible to modify and improve various properties for the resin. The cell viability assay also do it clear that the material is hydrophobic in character, which is recommended for denture and dental materials. This work proved efficient in the search for new routes of synthesis and also in obtaining better properties and reducing the raw material used. It was concluded that the sample AM3 presented a reduction in the costs of synthesis and of obtaining, being economically more viable among the evaluated materials.

MEMBROS DA BANCA:
Externo ao Programa - 1989838 - CAROLINE DANTAS VILAR WANDERLEY
Presidente - 1639676 - EDSON NORIYUKI ITO
Externo à Instituição - JOSÉ KAIO MAX ALVES DO RÊGO - UFS
Externo ao Programa - 2318723 - SERGIO ADRIANE BEZERRA DE MOURA