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 2023

Publication Date / Copyright Date

1-1-2023

Abstract

Objectives: To evaluate the fatigue resistance of extensively damaged premolars restored with Endocrowns and compare it with the current restoration techniques (post, core, and crown/ with and without ferrule) and to investigate the mode of failure of Endocrown and compare it with the current restoration techniques. Hypotheses: The fatigue resistance of extensively damaged premolars restored with Endocrowns will not differ when compared with the current restoration techniques and the mode of failure of Endocrown will not differ when compared to the current restoration techniques. Methods: Twenty-seven extracted premolars were assigned randomly into three different groups; Control Group1 (G1): Prefabricated glass fiber posts with 2-mm ferrule, Group2 (G2): Prefabricated glass fiber posts with no ferrule, and Group3 (G3): Endocrown with no ferrule. All groups received endodontic treatment followed by Lithium Disilicate restoration that was adhesively luted using 10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP) containing resin cement. Each group underwent thermocycling of 10,000 cycles at 5oC and 55oC for 30 seconds in each bath. Specimens were subjected to a cyclic fatigue test for 840,000 cycles while being immersed in distilled water. Specimens that survived the mechanical fatigue testing were loaded-to-failure and failure mode was analyzed. Results: All samples survived the mechanical cyclic fatigue testing without any evident failure. The one-way ANOVA showed statistical significance between the fracture resistance of the groups (p = <0.05). Tukey’s pairwise comparison test revealed a statistically significant difference between the fracture resistance of the control group (G1) in comparison to (G2) and (G3) (p < 0.05) and no statistical significance between (G2) and (G3) (P < 0.862). All groups showed the highest rate of favorable failure modes. Conclusion: Endocrowns displayed reliability as an alternative restorative treatment option for patients with severely compromised endodontically treated premolars as they are a fast, reliable, minimally invasive, and cost-effective treatment option compared to conventional treatment of post, core, and crown.

Disciplines

Dentistry

Keywords

Endocrowns; Endodontically treated teeth; Premolars

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