Trueness of vat-photopolymerization printing technology of interim fixed partial denture with different building orientation: A Microcomputed tomography study

Mohamed Radwan; Ahmed Abdou; Ahmed Tawfik; Paul Bills; Liam Blunt; Citra Kusumasari; Aliaa Mahrous

doi:10.4317/jced.61422

Trueness of vat-photopolymerization printing technology of interim fixed partial denture with different building orientation: A Microcomputed tomography study

J Clin Exp Dent. 2024 Apr 1;16(4):e494-e502. doi: 10.4317/jced.61422. eCollection 2024 Apr.

Authors

Mohamed Radwan¹, Ahmed Abdou², Ahmed Tawfik³, Paul Bills³, Liam Blunt³, Citra Kusumasari⁴, Aliaa Mahrous⁵

Affiliations

¹ Fixed Prosthodontics Department, Faculty of Dentistry, Bani-Suef University, Bani-Suef, Egypt.
² Faculty of Dentistry, Al-Ayen Iraq University, Thi-Qar, Iraq.
³ EPSRC Future Advanced Metrology Hub, University of Huddersfield, Huddersfield, United Kingdom.
⁴ Department of Conservative Dentistry, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia.
⁵ Fixed Prosthodontics Department, Faculty of Dentistry, Fayoum University, Fayoum,and October University for Modern Sciences and Art, 6th of October City, Egypt.

Abstract

Background: The aim was to assess the consequence of different printing orientation on the marginal misfit and internal gap of 3-unit interim fixed partial denture manufactured by two different additive manufacturing technologies compared to milling technique.

Material and methods: Three-unit interim fixed partial denture (FPD) was designed by using exocad software (Dental CAD 3.0 Galway) in the format of standard tessellation language (STL) , which was transferred to a nesting software (PreForm) and printed by A Next Dent C&B resin liquid (NextDent; Soesterberg, Neitherland) by using two printing technologies; stereolithography (SLA, n=30) and digital light processing (DLP, n=30) with 3 different orientations (occlusal direction [0°] ,buccal direction [90°] & lingual direction [270°]) for each technology (n=10). Additionally, a control group was milled (CAD/Milling, n=10) from DC PMMA A1 Disc (White peaks dental solutions; Gmbh& co., Germany). A Microcomputed tomography was used to measure the marginal misfit and internal gap for each specimen in 12 different points. The average value of the marginal and internal gaps measurements was calculated, and one-way ANOVA was used for the comparison between groups.

Results: SLA printing technology showed a similar result to CAD/Milling with all different printing orientations tested. DLP printing technology showed the highest gap values within all the printing orientations with significant difference (p< 0.001) with the CAD/Milling and SLA.

Conclusions: Regarding the trueness of the interim FPDs, SLA was a promising technology for its superior adaptation. Marginal misfit and Internal gap for DLP printing technology limiting the use of that technology as it exceeded the acceptable clinical range. Key words:3D Printing, Microcomputed topography, Marginal Gap, Internal Misfit.