Abstract
Statement of problem
The triple-scan method for assessing the 3D adaptation of dental restorations has
been introduced and reported to be reliable. However, the suitability of using a dental
laboratory scanner in the triple-scan method has not been evaluated.
Purpose
The purpose of this in vitro study was to evaluate the suitability of the triple-scan
method using a dental laboratory scanner to assess the 3D adaptation zirconia crowns.
Material and methods
A zirconia abutment and a zirconia crown were fabricated, and the abutment was fixed
in a custom-made base. The crown was seated onto the abutment with the interposition
of light-body silicone impression material between them. The triple-scan method was
performed by using a dental laboratory scanner, and the mean cement-gap thickness
was calculated. The seating and digitalization process was repeated 10 times, and after
each digitalization, the light-body silicone layer was stabilized by applying heavy-body
silicone impression material over it. Cement-gap thickness was measured on cross-sections
of the aligned scan data sets and of the physical silicone replica. The results were
assessed by using the paired t test and the Bland-Altman method (α=.05).
Results
Mean 3D cement-gap thickness assessed by the triple-scan method reported small dispersion
with a coefficient of variation of 5.6% for the occlusal area, 1.9% for the axial
area, and 6.4% for the margin area. Cement gap thickness measured at corresponding
locations in the aligned scan data sets and in the physical silicone replica reported
no significant difference (P=.326) and good agreement.
Conclusions
The cement gap was accurately duplicated in scan data sets. The triple-scan method
by using a dental laboratory scanner is suitable for assessing the 3D adaptation of
zirconia crowns.
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
- Marginal adaptation of ceramic crowns: a systematic review.J Prosthet Dent. 2013; 110: 447-454.e10
- An investigation of dental luting cement solubility as a function of the marginal gap.J Prosthet Dent. 1991; 65: 436-442
- 10-year clinical outcomes of fixed dental prostheses with zirconia frameworks.Int J Comput Dent. 2011; 14: 183-202
- Effect of cement space on stress distribution in Y-TZP based crowns.Dent Mater. 2017; 33: 144-151
- The effect of cement thickness on the fracture strength of all-ceramic crowns.Aust Dent J. 1995; 40: 17-21
- A comparison of the marginal fit of crowns fabricated with digital and conventional methods.J Prosthet Dent. 2014; 112: 555-560
- Effect of preparation angles on the precision of zirconia crown copings fabricated by CAD/CAM system.Dent Mater J. 2008; 27: 814-820
- Fabrication of a radiopaque fit-testing material to evaluate the three-dimensional accuracy of dental prostheses.Dent Mater. 2016; 32: 921-928
- New evaluation method by microfocus radiograph CT for 3D assessment of internal adaptation of all-ceramic crowns.Dent Mater J. 2005; 24: 362-367
- Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies.J Prosthet Dent. 2014; 112: 1432-1436
- Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing.J Prosthodont Res. 2018; 62: 56-64
- A new triple-scan protocol for 3D fit assessment of dental restorations.Quintessence Int. 2011; 42: 651-657
- A technique for in vitro fit assessment of multi-unit screw-retained implant restorations: application of a triple-scan protocol.J Dent Biomech. 2012; 3 (1758736012452181)
- Evaluation of the marginal fit of CAD-CAM zirconia copings: comparison of 2D and 3D measurement methods.J Prosthet Dent. 2018; 119: 75-81
- 3D fitting accuracy evaluation of CAD/CAM copings - comparison with spacer design settings.Int J Comput Dent. 2016; 19: 27-43
- Circumferential fit assessment of CAD/CAM single crowns--a pilot investigation on a new virtual analytical protocol.Quintessence Int. 2012; 43: 801-809
- Accuracy of 3-dimensional computer-aided manufactured single-tooth implant definitive casts.J Prosthet Dent. 2018; 120: 913-918
- Comparison of repeatability between intraoral digital scanner and extraoral digital scanner: an in-vitro study.J Prosthodont Res. 2015; 59: 236-242
- A novel methodology to validate the accuracy of extraoral dental scanners and digital articulation systems.Eur J Prosthodont Restor Dent. 2018; 26: 75-84
- Investigation into the accuracy and measurement methods of sequential 3D dental scan alignment.Dent Mater. 2019; 35: 495-500
- Comparison of two measurement techniques for clinical wear.J Dent. 1999; 27: 479-485
Article info
Publication history
Published online: April 21, 2020
Footnotes
Supported by the National Key R&D Program of China [2018YFB1106900]; Capital Science and Technology Leading Talent Project [Z191100006119022]; Capital’s Funds for Health Improvement and Research [2018-2-4103].
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
