Abstract
Statement of problem
Information on the morphological accuracy of crowns produced by different technologies
is limited.
Purpose
The purpose of this in vitro study was to compare the morphology and contacts of crowns
fabricated with intraoral systems, extraoral systems, and conventional method.
Material and methods
A typodont mandibular first molar (Nissin Dental Product) received a complete ceramic
crown preparation and a reference crown. Microcomputed tomography (μCT) was used to
obtain the virtual data (REF) of the reference crown. Three groups of replicated crowns
were made: intraoral scanning system (TRIOS), extraoral scanning system (D700), and
the conventional method (CONV) (n=8). The groups TRIOS and D700 were designed by the
correlation method. All crowns were scanned with μCT to obtain 3D data. The data were
superimposed on each other or the REF in an inspection software to evaluate precision
and trueness. The contact penetration area of the occlusal surfaces of the crowns
was calculated. An independent sample t test and 1-way ANOVA with the post hoc least significant difference (LSD) test were
used to compare the data (α=.05).
Results
The crowns fabricated with the extraoral scanners showed significantly lower root
mean square (RMS) values for trueness (F=1456.90, df=2, P<.001) and precision (F=188.88, df=2, P<.001) than the others. The penetration contact area ratio and the differences in
the CONV group were both significantly higher than those of the other groups.
Conclusions
The average discrepancies of the crown morphology fabricated from the extraoral scanning
were significantly lower than those from others. The conventional method restored
the occlusal contact with significantly less accuracy than the other groups.
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe to Journal of Prosthetic DentistryAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
References
- Fully automatic CAD design of the occlusal morphology of partial crowns compared to dental technicians' design.Clin Oral Investig. 2013; 17: 491-496
- Crown contours and gingival response.J Prosthet Dent. 1982; 47: 620-624
- Lithium silicate endocrown fabricated with a CAD-CAM system: A functional and esthetic protocol.J Prosthet Dent. 2017; 118: 131-134
- Evaluation of biogeneric design techniques with CEREC CAD/CAM system.J Adv Prosthodont. 2015; 7: 431-436
- Biogeneric tooth: a new mathematical representation for tooth morphology in lower first molars.Eur J Oral Sci. 2005; 113: 333-340
- Direct mechanical data acquisition of dental impressions for the manufacturing of CAD/CAM restorations.J Dent. 2007; 35: 903-908
- Accuracy of full-arch scans using intraoral scanners.Clin Oral Investig. 2014; 18: 1687-1694
- Fit of lithium disilicate crowns fabricated from conventional and digital impressions assessed with micro-CT.J Prosthet Dent. 2016; 116: 551-557
- A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes.J Prosthet Dent. 2014; 112: 1425-1431
- Comparison of chairside and laboratory CAD/CAM to conventional produced all-ceramic crowns regarding morphology, occlusion, and aesthetics.Clin Oral Investig. 2016; 20: 791-797
- In vitro comparison of the accuracy (trueness and precision) of six extraoral dental scanners with different scanning technologies.J Prosthet Dent. 2016; 116: 543-550
- Fabrication of an all-ceramic abutment crown under an existing removable partial denture using CAD/CAM technology.J Prosthet Dent. 2007; 98: 478-482
- Clinical outcomes of three different crown systems with CAD/CAM technology.J Prosthet Dent. 2014; 112: 770-777
- Digital versus conventional impressions for fixed prosthodontics: A systematic review and meta-analysis.J Prosthet Dent. 2016; 116: 184-190
- Comparison of dimensional accuracy of conventionally and digitally manufactured intracoronal restorations.J Prosthet Dent. 2018; 119: 233-238
- Marginal discrepancy dimensions of single unit metal crowns fabricated by using CAD-CAM-milled acrylate resin polymer blocks or a conventional waxing technique.J Prosthet Dent. 2018; 119: 948-953
- Accuracy of single crowns fabricated from ultrasound digital impressions.Dent Mater. 2018; 34: e280-e288
- Marginal and internal fit of CAD-CAM-fabricated composite resin and ceramic crowns scanned by 2 intraoral cameras.J Prosthet Dent. 2017; 117: 386-392
- Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies.J Prosthet Dent. 2014; 112: 1432-1436
- Comparison of biogenerically reconstructed and waxed-up complete occlusal surfaces with respect to the original tooth morphology.Clin Oral Investig. 2013; 17: 851-857
- Assessment of CAD-CAM zirconia crowns designed with 2 different methods: A self-controlled clinical trial.J Prosthet Dent. 2018; 120: 686-692
- A comparison between the occlusal morphology of virtually reconstructed posterior crowns and natural molars.Int J Periodontics Restorative Dent. 2014; 34: e73-e78
- Accuracy of complete-arch model using an intraoral video scanner: An in vitro study.J Prosthet Dent. 2016; 115: 755-759
- Temperature of elastomeric impression materials while setting in the mouth.J Dent Res. 1980; 59: 1985-1986
- Accuracy of complete-arch dental impressions: A new method of measuring trueness and precision.J Prosthet Dent. 2013; 109: 121-128
- ISO-5725e1. Accuracy (trueness and precision) of measurement methods and results-Part 1: general principles and definitions.ISO, Geneva1994 (Available at:)http://www.iso.org/iso/store.htmDate accessed: December 22, 2015
- Evaluation of the accuracy of extraoral laboratory scanners with a single-tooth abutment model: A 3D analysis.J Prosthodont Res. 2017; 61: 363-370
- Complete-arch accuracy of intraoral scanners.J Prosthet Dent. 2018; 120: 382-388
- Assessment of the progression of tooth wear on dental casts.J Oral Rehabil. 2015; 42: 600-604
- Retrospective long-term monitoring of tooth using study model.Br Dent J. 2003; 194: 211-213
- Erosion and abrasion of tooth-colored restorative materials and human enamel.J Dent. 2009; 37: 913-922
Article info
Publication history
Published online: April 25, 2020
Footnotes
Supported by the innovation project of science and technology of Shannxi province (grant#2016KTCL03-10) and grants from the Key research and Development program of Shaanxi province (grant #2017SF-106), and program for young researcher grant of Xi’an Jiao Tong University School and Hospital of Stomatology (grant #2016-04).
F.W. and H.H. contributed equally to this article.
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
