Turksayar, Almira Ada Diken; Donmez, Mustafa Borga; Olcay, Emin Orkun; Demirel, Münir; Demir, Esra (2022). Effect of printing orientation on the fracture strength of additively manufactured 3-unit interim fixed dental prostheses after aging. Journal of dentistry, 124, p. 104155. Elsevier Science 10.1016/j.jdent.2022.104155
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OBJECTIVES
To evaluate the effect of printing orientation on the fracture strength of 3-unit interim fixed dental prostheses fabricated by using additive manufacturing and to compare with those fabricated by subtractive manufacturing after thermomechanical aging.
MATERIALS AND METHODS
A 3-unit fixed dental prosthesis was designed by using a dental design software (exocad DentalCAD 2.2 Valetta) in standard tessellation language (STL) format. This STL file was exported into a nesting software (PreForm) and 3-unit interim fixed dental prostheses with 5 different orientations (0°, 30°, 45°, 90°, and 150°) were printed by using a 3-dimensional (3D) printing interim resin (Temporary CB) (n=10). The same STL file was also used to mill polymethymethacrylate (DuoCAD) 3-unit interim fixed dental prostheses as the control group (n=10). All specimens were cemented onto cobalt-chromium test models representing a maxillary first premolar and first molar tooth with a long-term temporary cement (DentoTemp), and subjected to thermomechanical aging (120000 cycles, 1.6 Hz, 50 N, 5-55°C). Then, all specimens were loaded until fracture by using a universal tester. The data were analyzed with nonparametric 1-way analysis of variance (Kruskal-Wallis) and Dunn's tests (α = 0.05).
RESULTS
Additively manufactured specimens printed with 90° showed the lowest fracture strength values (P≤.048). However, the difference between specimens printed with 45° and 90° was nonsignificant (P>.05). Milled 3-unit interim fixed dental prostheses withstood significantly higher loads than 3-unit interim fixed dental prostheses printed with 45° and 150° (P≤.012). In addition, specimens printed with 0° showed higher fracture strength than the specimens printed with 45° (P=.01). Specimens printed with 0° and 30° presented similar fracture strength values with milled (P≥.057) and 150° printed (P>.05) specimens.
CONCLUSION
Printing orientation had a significant effect on the fracture strength of 3-unit interim fixed dental prostheses. Among the additively manufactured samples, those printed with 0° showed similar fracture strength values with the subtractively manufactured samples.
CLINICAL SIGNIFICANCE
Three-unit interim fixed dental prostheses fabricated with 0° and 30° using the 3D printing interim resin tested may be alternatives to milled PMMA in terms of fracture strength.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine 04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology |
UniBE Contributor: |
Dönmez, Mustafa-Borga |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
0300-5712 |
Publisher: |
Elsevier Science |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
10 May 2022 09:47 |
Last Modified: |
08 May 2023 00:25 |
Publisher DOI: |
10.1016/j.jdent.2022.104155 |
PubMed ID: |
35526752 |
Uncontrolled Keywords: |
Fracture strength interim restoration printing orientation thermomechanical aging |
BORIS DOI: |
10.48350/169879 |
URI: |
https://boris.unibe.ch/id/eprint/169879 |
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