Statement of problem
Information on the morphological accuracy of crowns automatically produced by different computer-aided design (CAD) software programs for multilevel dentition defects is limited.
The purpose of this in vitro study was to compare the morphological accuracy of crowns fabricated using different CAD software programs with different design theories for multilevel dentition defects.
Material and methods
Four dentition defect types (the standard group, the abrasion group, the adjacent-teeth-missing group, and the antagonist-tooth–missing group, n=10) were fabricated to represent different levels of missing dentition information. Two design modes (the library mode and correlation mode) of 3 common CAD software programs (3Shape [3Shape Dental system], CEREC [Dentsply Sirona], and exocad DentalCAD [exocad GmbH]) were used to design crowns automatically, and the morphologies of the generated crowns and original teeth were recorded. The root mean square (RMS) value was calculated to evaluate the morphological deviations between the autogenerated crowns and original teeth using the 3D matching system (Geomagic GmbH). As each group in this study represented 3 factors, the mean differences between the treatment combinations and the interaction effects were analyzed by performing factorial analysis of variance (α=.05).
The RMS values of autogenerated crowns designed using the correlation method were significantly lower than those designed using the library method of each software program in the 4 groups (P<.05). The RMS values of crowns designed by the 3Shape and CEREC software programs in library mode under conditions with dentition information loss were lower than those of crowns designed by the exocad software program (P<.05). Changes in the acquisition of dental information did not decrease the CEREC design accuracy (P>.05), while they did decrease the 3Shape and exocad design accuracy (P<.05).
The correlation method showed higher accuracy in rebuilding the original morphology of the teeth than the library method. Both the 3Shape and CEREC software programs showed higher accuracy than the exocad software program in library mode under conditions with dentition information loss, while CEREC showed higher stability than the 3Shape and exocad software programs.
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- CAD/CAM ceramic restorative materials for natural teeth.J Dent Res. 2018; 97: 1082-1091
- The use of CAD/CAM in dentistry.Dent Clin North Am. 2011; 55 (ix): 559-570
- Accuracy of full-arch scans using intraoral scanners.Clin Oral Investig. 2014; 18: 1687-1694
- The current state of chairside digital dentistry and materials.Dent Clin North Am. 2019; 63: 175-197
- Comparative evaluation of the morphological accuracy of dental crowns fabricated by different technologies.J Prosthet Dent. 2021; 125: 645-650
- Assessment of CAD-CAM zirconia crowns designed with 2 different methods: a self-controlled clinical trial.J Prosthet Dent. 2018; 120: 686-692
- Influence of intra-oral scanner (I.O.S.) on the marginal accuracy of CAD/CAM single crowns.Int J Environ Res Public Health. 2019; 16: 544
- Accuracy of CAD/CAM digital impressions with different intraoral scanner parameters.Sensors (Basel). 2020; 20: 1157
- Chairside systems: a current review.Int J Comput Dent. 2017; 20: 123-149
- Clinical performance of chairside monolithic lithium disilicate glass-ceramic CAD-CAM crowns.J Esthet Restor Dent. 2019; 31: 613-619
- Biogeneric tooth: a new mathematical representation for tooth morphology in lower first molars.Eur J Oral Sci. 2005; 113: 333-340
- Comparison of biogenerically reconstructed and waxed-up complete occlusal surfaces with respect to the original tooth morphology.Clin Oral Investig. 2013; 17: 851-857
- A new mathematical process for the calculation of average forms of teeth.J Prosthet Dent. 2005; 94: 546-561
- Accurate extraction of outermost biological characteristic curves in tooth preparations with fuzzy regions.Comput Biol Med. 2018; 103: 208-219
- Comparing the precision of reproducibility of computer-aided occlusal design to conventional methods.J Prosthodont Res. 2019; 63: 110-114
- Influence of roughness on surface scanning by means of a laser stripe system.Int J Adv Manuf Technol. 2008; 43: 1157-1166
- Correlation between incident angle, measurement distance, object colour and the number of acquired points at CNC laser scanning.J Mech Eng. 2012; 58: 23-28
- Comparative analysis on reproducibility among 5 intraoral scanners: sectional analysis according to restoration type and preparation outline form.J Adv Prosthodont. 2016; 8: 354-362
- Understanding chair-side digital technology for stomatology from an engineering viewpoint.Zhonghua Kou Qiang Yi Xue Za Zhi. 2018; 53: 230-235
- Evaluation of biogeneric design techniques with CEREC CAD/CAM system.J Adv Prosthodont. 2015; 7: 431-436
- Comparison and evaluation of the morphology of crowns generated by biogeneric design technique with CEREC chairside system.PLoS One. 2020; 15e0227050
- Efficiency of a mathematical model in generating CAD/CAM-partial crowns with natural tooth morphology.Clin Oral Invest. 2011; 15: 283-289
- Lithium silicate endocrown fabricated with a CAD-CAM system: A functional and esthetic protocol.J Prosthet Dent. 2017; 118: 131-134
- A proposed system for screening tooth wear.Br Dent J. 2010; 208: 207-209
- Effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments.J Prosthet Dent. 2021; 125: 804.e1-804.e6
- Trueness and precision of 3D-printed versus milled monolithic zirconia crowns: an in vitro study.J Dent. 2021; 113: 103792
- CAD/CAM treatment for the elderly - a case report.Gerodontology. 2012; 29: E1176-E1179
- Pilot study on accuracy and dimensional stability of impression materials using industrial CT technology.J Orofac Orthop. 2011; 72: 111-124
- Dental occlusion: a critical reflection on past, present and future concepts.J Oral Rehabil. 2008; 35: 446-453
- Is occlusion becoming more confusing? A plea for simplicity.J Am Dent Assoc. 2004; 135 (70): 767-768
- Chairside treatment of amelogenesis imperfecta, including establishment of a new vertical dimension with resin nanoceramic and intraoral scanning.J Prosthet Dent. 2016; 116: 309-313
- Integrating conventional and CAD/CAM digital techniques for establishing canine protected articulation: A clinical report.J Prosthet Dent. 2016; 115: 515-519
Published online: February 18, 2023
Publication stageIn Press Corrected Proof
Funding: Supported by the National Natural Science Foundation of China (81970987).
F.W. and T.Z. contributed equally to this article.
© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.