Effect of printing orientation on the fracture strength of additively manufactured 3-unit interim fixed dental prostheses after aging.

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. (In Press). Journal of dentistry, 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)

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:

16 May 2022 16:24

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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