Additive or subtractive manufacturing of crown patterns used for pressing or casting: a trueness analysis.

Çakmak, Gülce; Donmez, Mustafa Borga; Cuellar, Alfonso Rodrigues; Kahveci, Çiğdem; Schimmel, Martin; Yilmaz, Burak (2022). Additive or subtractive manufacturing of crown patterns used for pressing or casting: a trueness analysis. Journal of dentistry, 124, p. 104221. Elsevier 10.1016/j.jdent.2022.104221

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OBJECTIVES

To investigate the effect of subtractive and additive manufacturing techniques on the trueness of crown patterns used for pressing or casting.

MATERIAL AND METHODS

A complete-coverage mandibular right first molar crown was designed in standard tessellation language (STL) format. This STL served as the control (C-STL) and was used to fabricate 30 crown patterns in 3D-printed resin (PR, ProArt Print Wax), millable wax suitable for casting (BW, ProArt CAD Wax Blue), and millable wax suitable for pressing (YW, ProArt CAD Wax Yellow) (n=10). Subtractively manufactured patterns were fabricated by using a 5-axis milling unit (PrograMill PM7), while 3D-printed patterns were fabricated by using a digital light processing-based 3D printer (PrograPrint PR5; Ivoclar Vivadent, Schaan, Liechtenstein). All fabricated patterns were digitized by using an intraoral scanner (CEREC Primescan SW 5.2) to generate test-STLs. C-STL and test-STLs were transferred into a 3D analysis software (Medit Link v 2.4.4). Trueness evaluation was performed at 4 different surfaces (external, intaglio with margin, marginal, and intaglio without margin) and for complete scan meshes (overall) by using the root mean square (RMS) method. Data were analyzed with Kruskal-Wallis and Mann-Whitney U tests (α=.05).

RESULTS

RMS values varied significantly at all surfaces (P<.001), except for marginal surface (P=.151). PR had the highest RMS values at external surface (P≤.007), intaglio surfaces (with (P≤.003) and without margin (P≤.005)), and overall (P≤.01). No significant differences were observed between YW and BW (P≥.223).

CONCLUSION

Patterns fabricated by using subtractive manufacturing exhibited high trueness. The deviation values, in general, were small, particularly at intaglio and marginal surfaces; thus, clinical difference in crown-fit may be negligible using additive or subtractive technique.

CLINICAL SIGNIFICANCE

The fit of definitive crowns may be similar when tested crown patterns are additively or subtractively manufactured. However, crowns fabricated by using tested 3D-printed resin patterns may require more chairside adjustments compared with those fabricated by using subtractively manufactured wax patterns.

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
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

Cakmak, Gülce, Dönmez, Mustafa-Borga, Schimmel, Martin, Yilmaz, Burak

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1879-176X

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

18 Jul 2022 10:15

Last Modified:

05 Dec 2022 16:21

Publisher DOI:

10.1016/j.jdent.2022.104221

PubMed ID:

35820503

Uncontrolled Keywords:

3D-printing milling resin pattern trueness

BORIS DOI:

10.48350/171308

URI:

https://boris.unibe.ch/id/eprint/171308

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