Student Theses, Dissertations and Capstones

Document Type

Thesis - NSU Access Only

Degree Name

Master of Science (M.S.) in Dentistry

Copyright Statement

All rights reserved. This publication is intended for use solely by faculty, students, and staff of Nova Southeastern University. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, now known or later developed, including but not limited to photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author or the publisher.

Department

College of Dental Medicine

First Advisor

Jeffrey Thompson

Date of original Performance / Presentation

January 2021

Publication Date / Copyright Date

1-1-2021

Abstract

Objective: This study compared the physical properties of different processing methods of Poly Methyl Methacrylate using varying dimensions. Aim: To Test the flexural strength of 3 different manufacturing and processing methods of Poly methyl-methacrylate (PMMA) at 250,000 loading cycles (FATIGUE LOADING; fatigued strength) for prosthetic analogues. To analyze the mode of fracture of the three PMMA materials used to manufacture prosthetic analogues. Hypothesis: There is no difference in flexural strength, modes of fracture, crack propagation between the conventionally processed Poly Methyl Methacrylate, 3D printed Poly Methyl Methacrylate and the Milled Poly Methyl Methacrylate. Materials and Methods: 3 sets of 20 samples of Poly Methyl Methacrylate of varying dimensions in height 15mm, 10mm, 7mm were processed using three different processing methods. Compression moulding, 3D printed and milled resembling a segment of an intra oral PMMA hybrid prosthesis. All samples were tested for biaxial cyclic fatigue, and ultimate flexural strength. Results: Of the 60 samples cyclically fatigued only one heat processed sample in the 7mm height group, fractured. All of the other samples in the heat processed, 3D printed, and milled group survived for 250,000 cycles. In testing the Ultimate flexural strength all samples survived in all groups to a force of 1000N. Conclusion Each mode of fabrication presented its own set of challenges. However, there was no significance in the strength or modes of failure of the three groups heat processed, 3D printed or milled. Within the limitations of this study all three fabrication methods are viable options for constructing Poly Methyl Methacrylate provisional hybrid prosthesis.

Disciplines

Dentistry

Keywords

3d printing; cad; cam ; pmma; poly methyl methacrylate ; poly methylmethacrylate

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