Statement of problem
Stereolithography (SLA) procedures can be chosen for manufacturing definitive crowns; however, how the print orientation impacts the trueness and precision of the intaglio surface of the printed definitive restorations is unclear.
The purpose of this in vitro investigation was to calculate the manufacturing accuracy of the intaglio surface of SLA definitive resin-ceramic crowns fabricated at varying print orientations (0, 45, 75, or 90 degrees).
Material and methods
The standard tessellation language (STL) file of an anatomic contour molar crown was obtained and used to fabricate all the crowns by using a definitive resin-ceramic material (Permanent Crown) and an SLA printer (Form 3B+). Four groups were developed depending on the print orientation selected to manufacture the crowns: 0-, 45-, 70-, and 90-degree print orientation (n=30). Each crown specimen was digitized without the use of scanning powder by using a desktop scanner (T710). The crown design file was determined as the reference (control) group and used to calculate the fabricating trueness and precision of the intaglio surface of the specimens using the root mean square (RMS) error computation. Trueness data were examined by using 1-way ANOVA and post hoc pairwise multiple comparison Tukey tests, while precision data were analyzed using the Levene test (α=.05).
The mean ±standard deviation RMS error discrepancies ranged from 37 ±3 μm to 113 ±11 μm. One-way ANOVA exposed significant trueness (P<.001) differences among the groups considered in this study. Furthermore, all the print orientation groups tested were different from each other (P<.001). The 0-degree group presented the best trueness value (37 μm), while the 90-degree group obtained the worst trueness value (113 μm). The Levene test exposed significant precision differences among the groups assessed (P<.001). The 0-degree group had a significantly lower standard deviation (higher precision) (3 μm) than the other groups, with no difference among the other groups tested (P>.05).
The fabricating trueness and precision of the intaglio surface of the SLA resin-ceramic crowns was impacted by the varying print orientations assessed.
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- Additive manufacturing technologies used for processing polymers: current status and potential application in prosthetic dentistry.J Prosthodont. 2019; 28: 146-158
- A review on chemical composition, mechanical properties, and manufacturing work flow of additively manufactured current polymers for interim dental restorations.J Esthet Restor Dent. 2019; 31: 51-57
- Internal and marginal discrepancies associated with stereolithography (SLA) additively manufactured zirconia crowns.J Prosthet Dent. 2020; 124: 730-737
- Efficiency of 3D-printed composite resin restorations compared with subtractive materials: evaluation of fatigue behavior, cost, and time of production.J Prosthet Dent. 1 November 2022; ([Epub ahead of print.])https://doi.org/10.1016/j.prosdent.2022.08.001
- 3D printing parameters, supporting structures, slicing, and post-processing procedures of vat-polymerization additive manufacturing technologies: a narrative review.J Dent. 2021; 109: 103630
- Effects of build direction on the mechanical properties of 3D-printed complete coverage interim dental restorations.J Prosthet Dent. 2016; 115: 760-767
- Effects of printing parameters on the fit of implant-supported 3d printing resin prosthetics.Materials (Basel). 2019; 12: 2533
- Printing accuracy, mechanical properties, surface characteristics, and microbial adhesion of 3D-printed resins with various printing orientations.J Prosthet Dent. 2020; 124: 468-475
- Flexural strength of 3d-printing resin materials for provisional fixed dental prostheses.Materials (Basel). 2020; 13: 3970
- Fracture load of 3D-printed fixed dental prostheses compared with milled and conventionally fabricated ones: The impact of resin material, build direction, post-curing, and artificial aging-an in vitro study.Clin Oral Investig. 2020; 24: 701-710
- Surface roughness and shear bond strength to composite resin of additively manufactured interim restorative material with different printing orientations.J Prosthet Dent. 30 September 2021; ([Epub ahead of print.])https://doi.org/10.1016/j.prosdent.2021.08.010
- Effect of build orientation in accuracy, flexural modulus, flexural strength, and microhardness of 3D-Printed resins for provisional restorations.J Mech Behav Biomed Mater. 2022; 136: 105479
- Influences of build angle on the accuracy, printing time, and material consumption of additively manufactured surgical templates.J Prosthet Dent. 2021; 126: 658-663
- Build angle: does it influence the accuracy of 3D-printed dental restorations using digital light-processing technology?.Int J Prosthodont. 2017; 30: 182-188
- Marginal and internal fit of 3D printed provisional crowns according to build directions.J Adv Prosthodont. 2020; 12: 225-232
- 3D printed versus conventionally cured provisional crown and bridge dental materials.Dent Mater. 2018; 34: 192-200
- Evaluation of intaglio surface trueness and margin quality of interim crowns in accordance with the build angle of stereolithography apparatus 3-dimensional printing.J Prosthet Dent. 2021; 126: 231-237
- In vitro investigation of the influence of printing direction on the flexural strength, flexural modulus and fractographic analysis of 3D-printed temporary materials.Dent Mater J. 2021; 40: 641-649
- Objects build orientation, positioning, and curing influence dimensional accuracy and flexural properties of stereolithographically printed resin.Dent Mater. 2018; 34: e324-e333
- Influence of the printing angle and load direction on flexure strength in 3d printed materials for provisional dental restorations.Materials (Basel). 2021; 14: 3376
- Factors influencing the dimensional accuracy of 3d-printed full-coverage dental restorations using stereolithography technology.Int J Prosthodont. 2016; 29: 503-510
- Influence of the layer thickness on the flexural strength of aged and nonaged additively manufactured interim dental material.J Prosthodont. 2023; 32: 68-73
- The effect of the angle of acuteness of additive manufactured models and the direction of printing on the dimensional fidelity: clinical implications.Odontology. 2017; 105: 108-115
- Influence of postprocessing rinsing solutions and duration on flexural strength of aged and nonaged additively manufactured interim dental material.J Prosthet Dent. 19 May 2022; ([Epub ahead of print.])https://doi.org/10.1016/j.prosdent.2022.03.034
- Influence of postpolymerization methods and artificial aging procedures on the fracture resistance and flexural strength of a vat-polymerized interim dental material.J Prosthet Dent. 2022; 128: 1085-1093
- Accuracy, reproducibility, and dimensional stability of additively manufactured surgical templates.J Prosthet Dent. 2019; 122: 309-314
- Best-fit algorithm influences on virtual casts' alignment discrepancies.J Prosthodont. 2023; 32: 331-339
- Facial scanning accuracy depending on the alignment algorithm and digitized surface area location: an in vitro study.J Dent. 2021; 110: 103680
- Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions.(Available at:)https://www.iso.org/obp/ui/#iso:std:iso:5725:-1:ed-1:v1:enDate accessed: January 2, 2023
- Dentistry — Digital impression devices — Part 1: Methods for assessing accuracy.(Available at:)https://www.iso.org/standard/69402.htmlDate accessed: January 2, 2023
- Effect of printing orientation on the fracture strength of additively manufactured 3-unit interim fixed dental prostheses after aging.J Dent. 2022; 124: 104155
Published online: May 26, 2023
Publication stageIn Press Corrected Proof
Conflict of Interest: The authors did not have any conflict of interest, financial or personal, in any of the materials described in this study.
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.