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

Niranjan Joshi

Date of original Performance / Presentation

January 2025

Publication Date / Copyright Date

1-1-2025

Abstract

Brief Background and Goal/Research Question: Zirconia crowns are crucial in dentistry for their durability and compatibility with the human body.1 However, maintaining their color stability post-surface treatments is vital for aesthetic appeal and patient satisfaction. Surface treatments like polishing, glazing, or coatings significantly impact color stability.1,2 This in-vitro study tests polishing procedure on zirconia restorations, evaluating immediate color impact and translucency. Factors like treatment type, duration, and materials used influence color variations. Understanding these effects is crucial for dentists and dental technicians. Specific Aims: This study aims to assess and compare how surface treatments affect the immediate color effects of zirconia restorations. Significance: This study's findings will offer insights into the optimal surface treatment for preserving zirconia restorations color and translucency. These insights will inform dental professionals, aiding in precise treatment planning for improved aesthetic outcomes in restorative dentistry. It helps in selecting the most suitable treatment method that balances both aesthetic appeal and the restoration's long-term durability. Innovation: This research meticulously examines polishing technique for zirconia crowns, advancing our understanding of their immediate impact on color characteristics. Employing established color measurement tools, this innovation quantifies and compares color changes before and after treatment. Research Plan: The methodological framework involves the systematic fabrication of 30 high translucent zirconia specimens with precise dimensions and consistent material composition to ensure sample homogeneity. These samples will be randomly allocated into two distinct treatment groups: Polishing (n=15), and No polishing (n=15) after glazing color characterization steps are completed. The Polishing group will receive meticulous polishing procedures aimed at refining the crown surfaces. Color differences (∆E) and differences in translucencies between the two groups and between the samples before and after polishing will be conducted using spectrophotometry. This process will evaluate color variations pre- and post-polishing by analyzing parameters within the CIE Lab* color space. The gathered data will undergo statistical analysis. The Welch’s t-test (SPSS Statistics v20; IBM Corp) will be used to identify significant differences in L*, a*, and b* values among groups (a=.05). Results: The polished surfaces of zirconia crowns appear to be smoother than non-polished surfaces, which result in larger and more perceptible color differences between no treatment and polishing. Conclusion: Results indicate that polishing significantly reduces the lightness (L*) of zirconia specimens compared to unpolished specimens, creating a darker and more natural appearance.

Disciplines

Dentistry

Keywords

Color measurement; Dental materials; Restorative dentistry

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