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The Effect of Build Angle on Compressive Strength of 3-D Printed Orthodontic Aligners

Stoyanova, Joanna (2022) The Effect of Build Angle on Compressive Strength of 3-D Printed Orthodontic Aligners. Master's Thesis, University of Pittsburgh. (Unpublished)

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Introduction: The current process of fabricating orthodontic aligners is by vacuum forming a sheet of plastic over a stone cast or 3D printed model of the patient’s dentition. As technology in dentistry advances, the capability to directly 3D print an orthodontic aligner will be a reality. The aim of this study is to test the compression strength of directly 3D printed orthodontic aligners printed at various angles. Methods: A maxillary typodont was scanned using an intraoral scanner and the STL file was used to digitally create a 0.75 mm thick aligner. This aligner was printed at 0°, 30°, 60°, and 90° in relation to the build plate. Eight aligner were 3D printed at each angle being tested using Dental Long Term clear resin. After post processing, the supports were removed and the aligners were compression tested using an Intron 5566 universal testing machine. The failure point of each aligner was recorded. The hypothesis is that aligners printed at steeper angles will be weaker in compression. Results: Thirty-two aligners were compression tested. The mean failure points of each group of aligners was as follows: the 0° aligners failed at 847 N, the 30° aligners failed at 877 N, the 60° aligners failed at 717 N, and 90° aligners failed at 811 N. A Kruskal-Wallis test was used to analyze the data and found no statistically significant difference between the four groups (p=0.09). Conclusions: The build angle does not significantly affect the compression strength of 3D printed orthodontic aligners. Orthodontic providers should use this data along with other studies to determine how best to orient their aligners to maximize efficiency during direct 3D printing.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Stoyanova, Joannajks76@pitt.edujks76
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairBurnheimer, Johnjmb334@pitt.edujmb334
Committee MemberVijayan, Suvendrasuv16@pitt.edusuv16
Committee MemberShah, Nileshnhs3@pitt.edunhs3
Date: 9 August 2022
Date Type: Publication
Defense Date: 17 May 2022
Approval Date: 9 August 2022
Submission Date: 31 May 2022
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 50
Institution: University of Pittsburgh
Schools and Programs: School of Dental Medicine > Dental Science
Degree: MDS - Master of Dental Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: aligners, compression, 3D printed
Date Deposited: 09 Aug 2022 18:53
Last Modified: 09 Aug 2022 18:53

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  • The Effect of Build Angle on Compressive Strength of 3-D Printed Orthodontic Aligners. (deposited 09 Aug 2022 18:53) [Currently Displayed]


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