Statement of problem
Information on the dimensional changes in maxillary and mandibular dentures made by using computer-aided design and computer-aided manufacturing (CAD-CAM) techniques under uniform testing conditions is lacking.
The purpose of this in vitro study was to evaluate the dimensional changes and reproducibility of maxillary and mandibular dentures by using CAD-CAM-milled and 3D-printed techniques.
Material and methods
Maxillary and mandibular edentulous models with wax occlusal rims were scanned, and dentures were designed by using a CAD software program and fabricated by using 2 techniques and materials: CAD-CAM-milled (CCM) and 3D-printed (3DP). The 3DP fabrications included 4 subgroups: dentures printed with a 90-degree build angle with UV light polymerization on the reference model (3DP 90M), dentures printed with a 90-degree build angle and light polymerization without the reference model (3DP 90), dentures printed with a 45-degree build angle with light polymerization on the reference model (3DP 45M), and dentures printed with a 45-degree build angle and light polymerization without the reference model (3DP 45). The preprocessing and postprocessing scan files of each denture produced by CCM and 3DP were superimposed by using a surface matching software program. Ten points each on maxillary and mandibular dentures were measured for deviations after processing. Additionally, for each denture, the widths were measured between the canines and molars, the anteroposterior plane from cusp tips between the canines and molars, and the vertical plane from the cusp tip of the canines to the marginal gingiva. They were then compared with those in the denture design CAD cast. The Kruskal-Wallis analysis of variance test was used for statistical analyses (α=.05).
According to digital superimposition, CCM had the smallest values of deviation with no statistical difference (P>.05), indicating more uniform results from measurement points in both maxillary and mandibular dentures, followed by 3DP 90M, 3DP 90, 3DP 45M, and 3DP 45. Regarding the width measurements, CCM had the smallest values of deviation (P<.05). In 3DP, smaller deviation values were observed at the vertical plane from the tip of the canine to the marginal gingiva, and larger values were observed in the intermolar width (P<.05).
CCM exhibited smaller dimensional changes and better reproducibility among the tested techniques. In 3DP, the build angle and methods of light postprocessing influenced the dimensional stability. The 90-degree build angle with additional light polymerization on the cast improved the dimensional deviations.
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- Temperature and dimensional changes in the two-stage processing processing technique for complete dentures.J Dent. 1995; 23: 245-253
- Dimensional change in complete dentures fabricated by injection molding and microwave processing.J Prosthet Dent. 2003; 89: 37-44
- Direct measurement of dimensional accuracy with three denture processing techniques.Int J Prosthodont. 1992; 5: 367-372
- Effect of palatal form on movement of teeth during processing of complete denture prosthesis: an in-vitro study.Contemp Clin Dent. 2016; 7: 36-40
- Prosthodontic treatment for edentulous patients.13th ed. Mosby/Elsevier, St. Louis2012: 255-280
- A CAD-CAM system for removable denture. Part I: fabrication of complete dentures.Int J Prosthodont. 1994; 7: 17-21
- Evaluation of currently available CAD-CAM denture systems.Int J Prosthodont. 2017; 30: 116-122
- Computer-aided technology for fabricating complete dentures: systematic review of historical background, current status, and future perspectives.J Prosthet Dent. 2013; 109: 361-366
- CAD-CAM milled removable complete dentures: an in vitro evaluation of trueness.Clin Oral Investig. 2017; 21: 2007-2019
- CAD-CAM complete dentures: a review of two commercial fabrication systems.J Calif Dent Assoc. 2013; 41: 407-416
- A comparison of two digital techniques for the fabrication of complete removable dental prostheses: a pilot clinical study.J Prosthet Dent. 2016; 116: 756-763
- Effects of fabrication techniques on denture base adaption: an in vitro study.J Prosthet Dent. 2020; 124: 740-747
- Comparing accuracy of denture bases fabricated by injection molding, CAD/CAM milling, and rapid prototyping method.J Adv Prosthodont. 2019; 11: 55-64
- Comparison of denture tooth movement between CAD-CAM and conventional fabrication techniques.J Prosthet Dent. 2018; 119: 108-115
- Comparison of denture base adaptation between CAD-CAM and conventional fabrication techniques.J Prosthet Dent. 2016; 116: 249-256
- Evaluation of the trueness and tissue surface adaptation of CAD-CAM mandibular denture bases manufactured using digital light processing.J Prosthet Dent. 2018; 120: 919-926
- Accuracy evaluation of dental models manufactured by CAD/CAM milling method and 3D printing method.J Adv Prosthodont. 2018; 10: 245-251
- A 3-dimensional accuracy analysis of chair side CAD/CAM milling processes.J Prosthet Dent. 2014; 112: 1425-1431
- Movement of artificial teeth in waxed trial dentures.J Prosthet Dent. 1986; 56: 644-648
- Accuracy of three-dimensional dental resin models created by fused deposition modeling, stereolithography, and Polyjet prototype technologies: a comparative study.Angle Orthod. 2018; 88: 363-369
- Dimensional accuracy of various denture base materials.J Prosthet Dent. 1962; 12: 67-81
- Accuracy of digitally fabricated trial dentures.J Prosthet Dent. 2018; 119: 942-947
- The effect of build angle on the tissue surface adaptation of maxillary and mandibular complete denture bases manufactured by digital light processing.J Prosthet Dent. 2020; 123: 473-482
- Study of shrinkage strains in a stereolithography cured acrylic photopolymer resin.J Mater Process Technol. 2003; 136: 146-150
- Accuracy of printed dental models made with 2 prototype technologies and different designs of model bases.Am J Orthod Dentofacial Orthop. 2017; 151: 1178-1187
Published online: August 04, 2021
Publication stageIn Press Corrected Proof
Supported by a grant from the National Taiwan University Hospital, Taipei, Taiwan, (NTUH.109-S4615) and Southern Taiwan Science Park Bureau, Ministry of Science and Technology, Taiwan, (STSP EX-03-17-29-108).
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.