Abstract
Statement of problem
Vat-polymerization additive manufacturing (AM) technologies can be used to fabricate
clear silicone indices for diagnostic trial restorations, interim restorations, and
direct composite resin restorations. Different support parameters, including print
orientation of the virtual design of the silicone index, need to be determined when
a dental device is fabricated with AM. However, the optimal printing angulation for
minimal surface texture remains unclear.
Purpose
The purpose of this in vitro study was to measure the surface roughness of the AM
clear silicone indices manufactured by using a vat-polymerization 3D printer with
different print orientations.
Material and methods
A virtual design of a facial silicone index was obtained, and the standard tessellation
language file was exported and used to manufacture all the specimens using a vat-polymerization
3D printer. All the specimens were placed on the build platform with the same parameters,
except for the print orientation which was selected as the only manufacturing variable.
Therefore, the 5 different groups were 0, 25, 45, 75, and 90 degrees. To minimize
variation in the procedure, all the specimens (N=50) were manufactured at the same
time in the selected printer at a constant room temperature of 23°C. The printer had
been previously calibrated following the manufacturer′s recommendations. Surface roughness
was measured in the intaglio of the left central maxillary incisor using an optical
profilometer with a magnification of ×20 and an array size of 640×480. Three measurements
per specimen were recorded. The Shapiro-Wilk test revealed that the data were normally
distributed, and the data were analyzed by using 1-way ANOVA, followed by the post
hoc Sidak test (α=.05).
Results
The 0-degree angulation printing group reported the least mean ±standard deviation
surface roughness (0.9 ±0.3 μm), followed by the 90-degree group (3.0 ±0.6 μm), the
75-degree group (12.4 ±1.0 μm), the 25-degree group (13.1 ±0.9 μm), and the 45-degree
group (13.5 ±1.0 μm). However, no statistically significant difference was found in
the surface roughness between the 25-degree and 45-degree print orientation groups
(P=.296).
Conclusions
Print orientation significantly influenced the surface roughness measured on the intaglio
of the facial AM silicone indices tested.
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References
- ISO 17296-2:2015. Additive manufacturing general principles part 2: overview of process categories and feedstock.(Available at:)https://www.iso.org/standard/61626.html?browse=tcDate accessed: January 6, 2019
ASTM, Committee F42 on additive manufacturing technologies, West Conshohocken, Pa. 2009 Standard terminology for additive manufacturing general principles and terminology. ISO/ASTM52900-15. Available at: http://www.astm.org/cgi-bin/resolver.cgi? (Accessed January 5, 2019).
- Digital micromirror device.2009 (US Patent No. 5061.049)
- Rapid prototyping technologies and their applications in prosthodontics, a review of literature.J Dent Shiraz Univ Med Sci. 2015; 16: 1-9
- Additive manufacturing technologies used for processing polymers: current status and potential application in prosthetic dentistry.J Prosthodont. 2019; 28: 146-158
- Effects of environmental conditions, aging, and build orientations on the mechanical properties of ASTM type I specimens manufactured via stereolithography.Rapid Prototyp J. 2012; 18: 374-388
- Production tolerance of additive manufactured polymeric objects for clinical applications.Dent Mater. 2016; 32: 853-861
- Effect of build direction on the mechanical properties of 3D printed complete coverage interim dental restorations.J Prosthet Dent. 2016; 155: 760-767
- Fracture load of 3D-printed fixed dental prostheses compared with milled and conventionally fabricated ones: the impact of resin material, build orientation, postcuring and artificial aging - an in vitro study.Clin Oral Investig. 2020; 24: 701-710
- Color dimensions of additive manufactured interim restorative dental material.J Prosthet Dent. 2020; 123: 754-760
- 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
- Mechanics of shape distortion of DLP 3D printed structures during UV post-curing.Soft Matter. 2019; 15: 6151-6159
- Surface quality of 3D-printed models as a function of various printing parameters.Materials (Basel). 2019; 19: 12
- Effects of printing parameters on the fit of implant-supported 3D printing resin prosthetics.Materials (Basel). 2019; 12: 2533
- Influence of the three dimensional printing technique and printing layer thickness on model accuracy.J Orofac Ortho. 2019; 80: 194-204
- Effect of print layer height on the assessment of 3D-printed models.Am J Orthod Dentofacial Orthop. 2019; 156: 283-289
- Effect of print layer height and printer type on the accuracy of 3-dimensional printed orthodontic models.Am J Orthod Dentofacial Orthop. 2017; 152: 557-565
- 3D printed material for temporary restorations: impact of print layer thickness and post-curing method on degree of conversion.Int J Comput Dent. 2019; 22: 231-237
- Influence of layer thickness on mechanical properties in stereolithography.Rapid Prototyp J. 2006; 12: 106-113
- Determining optimal parameters for stereolithography processes via genetic algorithm.J Manuf. 2000; 19: 18-27
- Factors influencing the dimensional accuracy of 3D-printed full-coverage dental restorations using stereolithography technology.Int J Prosthodont. 2016; 29: 503-510
- Objects build orientation, positioning, and curing influence dimensional accuracy and flexural properties of stereolithographically printed resin.Dent Mater. 2018; 34: e324-e333
- 3D printed versus conventionally cured provisional crown and bridge dental materials.Dent Mater. 2018; 34: 192-200
- A simultaneously sensing system to improve efficiency of Digital Light Process Printing.2017 International Conference on Applied System Innovation (ICASI), Sapporo, 2017: 1379-1382
- High-fidelity and high-efficiency additive manufacturing using tunable pre-curing digital light processing.Addit Manuf. 2019; 30: 100889
- A process planning method for improving build performance in stereolithography.J Comput- Aided Des. 2001; 33: 65-79
- A review on chemical composition, mechanical properties, and manufacturing workflow of additively manufactured current polymers for interim dental restorations.J Esthet Restor Dent. 2019; 31: 51-57
- A report on a diagnostic digital workflow for esthetic dental rehabilitation using additive manufacturing technologies.Int J Esthet Dent. 2018; 13: 184-196
- Digital tools and 3D printing technologies integrated into the workflow of restorative treatment: A clinical report.J Prosthet Dent. 2019; 121: 3-8
- Workflow description of additively manufactured clear silicone indexes for injected provisional restorations: A novel technique.J Esthet Restor Dent. 2019; 31: 213-221
- Digital workflow for an esthetic rehabilitation using facial and intraoral scanner and an additive manufactured silicone index: A dental technique.J Prosthet Dent. 2020; 123: 564-570
- Mutans streptococci in plaque from margins of amalgam, composite, and glass-ionomer restorations.J Dent Res. 1990; 69: 861-864
- Bacterial adhesion of Streptococcus mutans to provisional fixed prosthodontic material.J Prosthet Dent. 2007; 98: 461-469
Article info
Publication history
Published online: April 22, 2020
Identification
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
