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 2026

Publication Date / Copyright Date

1-1-2026

Abstract

ABSTRACT EFFECT OF PRINTING ORIENTATION ON THE TRUENESS AND PRECISION OF SCREW ACCESS CHANNEL DIMENSIONS ACROSS DIFFERENT PROSTHETIC SCREW DESIGNS IN 3D-PRINTED RESIN-BASED IMPLANT RESTORATIONS. Degree Date: September 2026 ABDULLAH ALOMAIR, B.S., D.D.S COLLEGE OF DENTAL MEDICINE NOVA SOUTHEASTERN UNIVERSITY Thesis Directed by: Jeffrey Y. Thompson, PhD, FADM, Committee Chair Daniel B. Feit, DMD, CAGS, MS, Committee Member Ivan Sanchez, PhD, Committee Member Objective: The objective of this study was to evaluate the influence of three printing orientations (0°, 15°, and 30°) and three prosthetic screw designs (Powerball 1.0, PRH-30, and Rosen 1.4 mm) on the trueness and precision of screw access channel (SAC) geometry in 3D-printed resin-based implant restorations. Background: Additive manufacturing has become increasingly integrated into implant dentistry; however, the effect of printing orientation on screw access channel (SAC) dimensional accuracy across different prosthetic screw designs remains unclear. This study evaluated the influence of printing orientation and prosthetic screw design on the trueness and precision of SAC dimensions in 3D-printed resin-based implant restorations. Methods: Ninety standardized specimens representing three prosthetic screw designs (Powerball 1.0, PRH-30, and Rosen 1.4 mm) were printed at 0°, 15°, and 30° orientations (n=10 per group). The SAC was subdivided into three distinct measurement zones according to their geometric and functional relationships with the prosthetic screw and MUA interface. Zone 1: width of the screw-head/countersink or counterbore region, Zone 2: width of the screw-shank clearance hole and Zone 3: height of the conical MUA/prosthesis interface region. Following printing and post-processing, specimens were evaluated using stereomicroscopy at 25X magnification, and dimensions were measured using ImageJ. Trueness was determined from deviations from the digital reference dimensions, and precision was evaluated from variability among specimens. Statistical analysis was performed at α=.05. Results: Printing orientation significantly influenced both SAC trueness and precision (P<.001), while prosthetic screw design significantly influenced trueness (P=.001). The 0° orientation demonstrated the lowest dimensional deviation across all three prosthetic screw designs compared with the 15° and 30° orientations. The greatest overall precision was observed at 0° (24.3 µm), followed by 15° (34.7 µm) and 30° (51.3 µm). The effect of printing orientation on trueness varied according to the SAC zone evaluated, with Zone 3 demonstrating the most pronounced design- and orientation-dependent differences. No single prosthetic screw design demonstrated the greatest trueness across all three SAC zones. Conclusion: Printing orientation was an important factor in the dimensional accuracy of SACs in 3D-printed resin-based implant restorations. Within the conditions of this study, the 0° printing orientation demonstrated the greatest overall trueness and precision, while the effect of prosthetic screw design varied across the SAC zones. These findings highlight the importance of considering both printing orientation and prosthetic screw design when evaluating SAC dimensional accuracy.

Disciplines

Dentistry

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