Comparison of dimensional accuracy between direct-printed and thermoformed aligners
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Objective: The purpose of this study was to evaluate and compare the dimensional accuracy between thermoformed and direct-printed aligners. Methods: Three types of aligners were manufactured from the same reference standard tessellation language (STL) file: thermoformed aligners were manufactured using Zendura FLXTM (n = 12) and Essix ACETM (n = 12), and direct-printed aligners were printed using Tera HarzTM TC-85DAP 3D Printer UV Resin (n = 12). The teeth were not manipulated with any tooth-moving software in this study. The samples were sprayed with an opaque scanning spray, scanned, imported to Geomagic® Control XTM metrology software, and superimposed on the reference STL file by using the best-fit alignment algorithm. Distances between the aligner meshes and the reference STL file were measured at nine anatomical landmarks. Results: Mean absolute discrepancies in the Zendura FLXTM aligners ranged from 0.076 ± 0.057 mm to 0.260 ± 0.089 mm and those in the Essix ACETM aligners ranged from 0.188 ± 0.271 mm to 0.457 ± 0.350 mm, while in the direct-printed aligners, they ranged from 0.079 ± 0.054 mm to 0.224 ± 0.041 mm. Root mean square values, representing the overall trueness, ranged from 0.209 ± 0.094 mm for Essix ACETM, 0.188 ± 0.074 mm for Zendura FLXTM, and 0.140 ± 0.020 mm for the direct-printed aligners. Conclusions: This study showed greater trueness and precision of direct-printed aligners than thermoformed aligners.
Abstract
Objective: The purpose of this study was to evaluate and compare the dimensional accuracy between thermoformed and direct-printed aligners. Methods: Three types of aligners were manufactured from the same reference standard tessellation language (STL) file: thermoformed aligners were manufactured using Zendura FLXTM (n = 12) and Essix ACETM (n = 12), and direct-printed aligners were printed using Tera HarzTM TC-85DAP 3D Printer UV Resin (n = 12). The teeth were not manipulated with any tooth-moving software in this study. The samples were sprayed with an opaque scanning spray, scanned, imported to Geomagic® Control XTM metrology software, and superimposed on the reference STL file by using the best-fit alignment algorithm. Distances between the aligner meshes and the reference STL file were measured at nine anatomical landmarks. Results: Mean absolute discrepancies in the Zendura FLXTM aligners ranged from 0.076 ± 0.057 mm to 0.260 ± 0.089 mm and those in the Essix ACETM aligners ranged from 0.188 ± 0.271 mm to 0.457 ± 0.350 mm, while in the direct-printed aligners, they ranged from 0.079 ± 0.054 mm to 0.224 ± 0.041 mm. Root mean square values, representing the overall trueness, ranged from 0.209 ± 0.094 mm for Essix ACETM, 0.188 ± 0.074 mm for Zendura FLXTM, and 0.140 ± 0.020 mm for the direct-printed aligners. Conclusions: This study showed greater trueness and precision of direct-printed aligners than thermoformed aligners.
참고문헌 (30)
- Rosvall MD, "Attractiveness, acceptability, and value of orthodontic appliances", Am J Orthod Dentofacial Orthop, 135, pp.276~ (2009)
- Weir T, "Clear aligners in orthodontic treatment", Aust Dent J, 62(Suppl 1), pp.58~62 (2017)
- Jindal P, "Mechanical and geometric properties of thermoformed and 3D printed clear dental aligners", Am J Orthod Dentofacial Orthop, 156, pp.694~701 (2019)
- Edelmann A, "Analysis of the thickness of 3-dimensional-printed orthodontic aligners", Am J Orthod Dentofacial Orthop, 158, pp.e91~e98 (2020)
- Wan Hassan WN, "Comparison of reconstructed rapid prototyping models produced by 3-dimensional printing and conventional stone models with different degrees of crowding", Am J Orthod Dentofacial Orthop, 151, pp.209~218 (2017)
- Mantovani E, "Scanning electron microscopy evaluation of aligner fit on teeth", Angle Orthod, 88, pp.596~601 (2018)
- Lombardo L, "MicroCT X-ray comparison of aligner gap and thickness of six brands of aligners : an in-vitro study", Prog Orthod, 21, pp.12~ (2020)
- Chisari JR, "Variables affecting orthodontic tooth movement with clear aligners", Am J Orthod Dentofacial Orthop, 145(4 Suppl), pp.S82~S91 (2014)
- Bowman SJ, "Improving the predictability of clear aligners", Semin Orthod, 23, pp.65~75 (2017)
- Holm C, "Longevity and quality of FPDs: a retrospective study of restorations 30, 20, and 10 years after insertion", Int J Prosthodont, 16, pp.283~289 (2003)
- Johal A, "The reliability of thermoform retainers : a laboratory-based comparative study", Eur J Orthod, 37, pp.503~507 (2015)
- Cole D, "Evaluation of fit for 3D-printed retainers compared with thermoform retainers", Am J Orthod Dentofacial Orthop, 155, pp.592~599 (2019)
- Kim SY, "Precision and trueness of dental models manufactured with different 3-dimensional printing techniques", Am J Orthod Dentofacial Orthop, 153, pp.144~153 (2018)
- Cho JH, "Trueness of the inner surface of monolithic crowns fabricated by milling of a fully sintered(Y, Nb)-TZP block in chairside CAD-CAM system for single-visit dentistry", Materials(Basel), 12, pp.3253~ (2019)
- Peters MC, "Comparison of two measurement techniques for clinical wear", J Dent, 27, pp.479~485 (1999)
- Yamada J, "Thermoforming process for fabricating oral appliances : influence of heating and pressure application timing on formability", J Prosthodont, 16, pp.452~456 (2007)
- Nakano H, "Development of biocompatible resins for 3D printing of direct aligners", J Photopolym Sci Technol, 32, pp.209~216 (2019)
- Zinelis S, "Comparative analysis of mechanical properties of orthodontic aligners produced by different contemporary 3D printers", Orthod Craniofac Res (2021)[DOI]
- Unkovskiy A, "Stereolithography vs. direct light processing for rapid manufacturing of complete denture bases: an in vitro accuracy analysis", J Clin Med, 10, pp.1070~ (2021)
- Su TS, "Comparison of repeatability between intraoral digital scanner and extraoral digital scanner : an in-vitro study", J Prosthodont Res, 59, pp.236~242 (2015)
- Park ME, "Three-dimensional comparative study on the accuracy and reproducibility of dental casts fabricated by 3D printers", J Prosthet Dent, 119, pp.861~ (2018)
- Ryokawa H, "The mechanical properties of dental thermoplastic materials in a simulated intraoral environment", Orthod Waves, 65, pp.64~72 (2006)
- Schuster S, "Structural conformation and leaching from in vitro aged and retrieved Invisalign appliances", Am J Orthod Dentofacial Orthop, 126, pp.725~728 (2004)
- Eliades T, "Cytotoxicity and estrogenicity of Invisalign appliances", Am J Orthod Dentofacial Orthop, 136, pp.100~103 (2009)
- Brezniak N, "The clear plastic appliance : a biomechanical point of view", Angle Orthod, 78, pp.381~382 (2008)
- Hahn W, "Influence of thermoplastic appliance thickness on the magnitude of force delivered to a maxillary central incisor during tipping", Am J Orthod Dentofacial Orthop, 136, pp.12~ (2009)
- Wheeler T, "Invisalign clinical trials needed", Am J Orthod Dentofacial Orthop, 127, pp.527~ (2005)
- Qi HJ, "Stress-strain behavior of thermoplastic polyurethanes", Mech Mater, 37, pp.817~839 (2005)
- Lombardo L, "Optical properties of orthodontic aligners--spectrophotometry analysis of three types before and after aging", Prog Orthod, 16, pp.41~ (2015)
- 김경연, "Effects of a new type of clear overlay retainer on occlusal contacts", 대한치과교정학회지, 47(3), pp.207~212 (2017), 대한치과교정학회