Statement of problem
Additive manufacturing (AM) is a technology that has been recently introduced into dentistry for fabricating dental devices, including interim restorations. Printing orientation is one of the important and influential factors in AM that affects the accuracy, surface roughness, and mechanical characteristics of printed objects. However, the optimal print orientation for best bond strength to 3D-printed interim restorations remains unclear.
The purpose of this in vitro study was to evaluate the effect of printing orientation on the surface roughness, topography, and shear bond strength of AM interim restorations to composite resin.
Material and methods
Disk-shaped specimens (Ø20×10 mm) were designed by a computer-aided design software program (Geomagic freeform), and a standard tessellation language (STL) file was obtained. The STL file was used for the AM of 60 disks in 3 different printing orientations (0, 45, and 90 degrees) by using E-Dent 400 C&B material. An autopolymerizing interim material (Protemp 4) was used as a control group (CNT), and specimens were fabricated by using the injecting mold technique (n=20). Surface roughness (Sa, Sz parameters) was measured by using a 3D-laser scanning confocal microscope (CLSM) at ×20 magnification. For shear bond testing, the specimens were embedded in polymethylmethacrylate autopolymerized resin (n=20). A flowable composite resin was bonded by using an adhesive system. The specimens were stored in distilled water at 37 °C for 1 day and thermocycled 5000 times. The shear bond strength (SBS) was measured at a crosshead speed of 1 mm/min. The data were analyzed by 1-way ANOVA, followed by the Tukey HSD test (α=.05).
The 45-degree angulation printing group reported the highest Sa, followed by the CNT and the 90-degree and 0-degree angulations with significant difference between them (P<.001). The CNT showed the highest Sz, followed by the 45-degree, 90-degree, and 0-degree angulations. The mean ±standard deviation SBS was 28.73 ±5.82 MPa for the 90-degree, 28.21 ±10.69 MPa for the 45-degree, 26.21 ±11.19 MPa for the 0-degree angulations and 25.39 ±4.67 MPa for the CNT. However, no statistically significant difference was found in the SBS among the groups (P=.475).
Printing orientation significantly impacted the surface roughness of 3D-printed resin for interim restorations. However, printing orientation did not significantly affect the bond strength with composite resin.
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- Contemporary fixed prosthodontics.6th ed. Elsevier, Philadelphia2023: 439-480
- Mechanical properties of urethane and bis-acryl interim resin materials.J Prosthet Dent. 2013; 110: 21-28
- Management of provisional restorations’ deficiencies: A Literature Review.J Esthet Restor Dent. 2012; 24: 26-38
- Interim restorations.Dent Clin North Am. 2004; 48: 487-497
- Dental polymers.in: Phillips’ science of dental materials. 12th ed. Elsevier Science, St. Louis, MO2013: 92-110
- Mechanical properties of provisional dental materials: a systematic review and meta-analysis.PLoS One. 2018; 13: e0193162
- A review of selected dental literature on contemporary provisional fixed prosthodontic treatment: report of the committee on research in fixed prosthodontics of the academy of fixed prosthodontics.J Prosthet Dent. 2003; 90: 474-497
- Comparative in vitro evaluation of two provisional restorative materials.J Prosthet Dent. 2001; 85: 129-132
- Shear bond strength of provisional restoration materials repaired with light-cured resins.Oper Dent. 2008; 33: 508-515
- Influence of surface treatments and repair materials on the shear bond strength of CAD/CAM provisional restorations.J Adv Prosthodont. 2019; 11: 95-104
- Repair of bis-acryl provisional restorations using flowable composite resin.J Prosthet Dent. 2004; 92: 500-502
- Influence of polymerization conditions on monomer elution and microhardness of autopolymerized polymethyl methacrylate resin.Eur J Oral Sci. 2002; 110: 179-183
- Predictable repair of provisional restorations.J Esthet Restor Dent. 2009; 21: 19-24
- Evaluation of the flexural strength and microhardness of provisional crown and bridge materials fabricated by different methods.J Indian Prosthodont Soc. 2016; 16: 328-334
- Fracture strength of temporary fixed partial dentures: CAD/CAM versus directly fabricated restorations.Dent Mater. 2011; 27: 339-347
- Comparison of interim restorations fabricated by CAD/CAM with those fabricated manually.J Prosthet Dent. 2015; 114: 414-419
- 3D printing in dentistry—state of the art.Oper Dent. 2020; 45: 30-40
- The potential of additive manufacturing technologies and their processing parameters for the fabrication of all-ceramic crowns: a review.J Esthet Restor Dent. 2020; 32: 182-192
- Fracture resistance of additively manufactured zirconia crowns when cemented to implant supported zirconia abutments: an in vitro study.J Prosthodont. 2019; 28: 893-897
- A selective laser sintering prototype guide used to fabricate immediate interim fixed complete arch prostheses in flapless dental implant surgery: technique description and clinical results.J Prosthet Dent. 2016; 116: 874-879
- Accuracy and complications of computer-designed selective laser sintering surgical guides for flapless dental implant placement and immediate definitive prosthesis installation.J Periodontol. 2012; 83: 410-419
- Possibilities of preoperative medical models made by 3D printing or additive manufacturing.J Med Eng. 2016; 2016: 6191526
- A digital process for additive manufacturing of occlusal splints: a clinical pilot study.J R Soc Interface. 2013; 10: 20130203
- Applications of rapid prototyping technology in maxillofacial prosthetics.Int J Prosthodont. 2004; 17: 454-459
- Die spacer thickness reproduction for central incisor crown fabrication with combined computer-aided design and 3D printing technology: an in vitro study.J Prosthet Dent. 2015; 113: 398-404
- 3D printed versus conventionally cured provisional crown and bridge dental materials.Dent Mater. 2018; 34: 192-200
- Effects of build direction on the mechanical properties of 3D-printed complete coverage interim dental restorations.J Prosthet Dent. 2016; 115: 760-767
- Digital dentistry: an overview of recent developments for CAD/CAM generated restorations.Br Dent J. 2008; 204: 505-511
- 3-D printing: the new industrial revolution.Bus Horiz. 2012; 55: 155-162
- 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
- Additive manufacturing of dental polymers: an overview on processes, materials and applications.Dent Mater J. 2020; 39: 345-354
- 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
- On the computation of part orientation using support structures in layered manufacturig.(Proceedings of the solid Free-form fabrication symposium, Austin TX)1994: 259-269
- Advances in three dimensional printing – state of the art and future perspectives.Rapid Prototyp J. 2006; 12: 136-147
- Review of process planning techniques in layered manufacturing.Rapid Prototyp J. 2000; 6: 18-35
- Printing accuracy, mechanical properties, surface characteristics, and microbial adhesion of 3D-printed resins with various printing orientations.J Prosthet Dent. 2020; 124: 468-475
- Influence of printing angulation on the surface roughness of additive manufactured clear silicone indices: An in vitro study.J Prosthet Dent. 2021; 125: 462-468
- Topography of selectively laser melted surfaces: a comparison of different measurement methods.CIRP Annals. 2017; 66: 543-546
- Topography of as built surfaces generated in metal additive manufacturing: a multi scale analysis from form to roughness.Precis Eng. 2018; 52: 249-265
- Shear bond strength of provisional repair materials bonded to 3D printed resin.J Dent Sci. 2021; 16: 261-267
- Surface quality of 3D-printed models as a function of various printing parameters.Materials (Basel). 2019; 12: 1-15
- Effect of print layer height on the assessment of 3D-printed models.Am J Orthod Dentofac 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 Dentofac Orthop. 2017; 152: 557-565
- Shear bond Strength of bis-acryl composite provisional material repaired with flowable composite.J Esthet Restor Dent. 2002; 14: 47-52
- Durability of surface treatments and intermediate agents used for repair of a polished composite.Oper Dent. 2010; 35: 231-237
- Effects of different surface treatments on bond strength of resin cement to machined pure titanium.J Adhes Dent. 2019; 21: 401-411
- Effect of combinations of surface treatments and bonding agents on the bond strength of repaired composites.J Prosthet Dent. 1997; 77: 122-126
- Bonding of resin composites to etchable ceramic surfaces - an insight review of the chemical aspects on surface conditioning.J Oral Rehabil. 2007; 34: 622-630
- Effect of incorporating BisGMA resin on the bonding properties of silane and zirconia primers.J Prosthet Dent. 2013; 110: 402-407
- The effect of hydrofluoric acid etching duration on the surface micromorphology, roughness, and wettability of dental ceramics.Int J Mol Sci. 2016; 17: 822
- A new approach for Y-TZP surface treatment: evaluations of roughness and bond strength to resin cement.J Appl Oral Sci. 2019; 27
- Comparison of the shear bond strength of 3d printed temporary bridges materials, on different types of resin cements and surface treatment.J Clin Exp Dent. 2019; 11: 367-372
Published online: September 30, 2021
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.