Abstract
Statement of problem
The absolute marginal fit of CAD-CAM presintered fixed partial dentures has been poorly
documented.
Purpose
The purpose of this in vitro study was to evaluate the marginal fit of presintered
cobalt-chromium (Co-Cr) and zirconia 3-unit fixed partial dentures by using X-ray
microcomputed tomography (μCT).
Material and methods
A metal model was prepared from a typodont to receive fixed partial dentures (N=12).
The maxillary first premolar and first molar were prepared with a circumferential
1.2-mm chamfer and 2-mm occlusal reduction. The dies were scanned and assigned to
1 of 2 groups to receive the prostheses made of presintered Co-Cr or presintered zirconia
(n=6). Each framework was seated on its model without load application. The abutments
were scanned by using μCT. A circle with 10 diameters, with a step of 18 degrees,
was projected at the center of the obtained image. Absolute marginal discrepancy and
marginal gap mean values were measured, and overextended and underextended margins
determined. The data were analyzed by using the Levene t test and ANOVA (α=.05).
Results
No statistically significant difference was found in the marginal fit between the
materials tested (P=.939). The mean values were 66 ±14 μm for Co-Cr and 61 ±12 μm for zirconia. The absolute
marginal discrepancy mean value for the premolar was 69 ±12 μm and 41 ±9 μm for the
molar (P<.001). Overextension was predominant for both materials tested, with a higher percentage
reported for the zirconia group.
Conclusions
Presintered alloys presented clinically acceptable adaptation with a predominance
of marginal overextensions.
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 and internal fit of metal–ceramic crowns fabricated with a new laser melting technology.Dent Mater. 2008; 24: 1311-1315
- Considerations in measurement of marginal fit.J Prosthet Dent. 1989; 62: 405-408
- Marginal and internal fit of pre-sintered Co-Cr and zirconia 3-unit fixed dental prostheses as measured using microcomputed tomography.J Prosthet Dent. 2018; 120: 409-414
- Precision of fit of two margin designs for metal-ceramic crowns.J Prosthodont. 2007; 16: 233-237
- Non destructive in vitro quantification of crown margins.J Prosthet Dent. 2001; 85: 575-584
- Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology.Braz Oral Res (São Paulo). 2013; 27: 396-402
- Marginal and internal adaptation of milled cobalt-chromium copings.J Prosthet Dent. 2015; 114: 680-685
- Effect of sintering on the marginal and internal fit of CAD/CAM-fabricated zirconia frameworks.Dent Mater J. 2007; 2007: 820-826
- Clinical marginal and internal adaptation of CAD/CAM milling, laser sintering, and cast metal ceramic crowns.J Prosthet Dent. 2014; 112: 909-913
- Assessment of sensitivity and specificity of clinical evaluation of cast restoration marginal accuracy compared to stereomicroscopy.J Prosthet Dent. 2005; 93: 138-142
- The estimation of cement film thickness by an in vivo technique.Br Dent J. 1971; 131: 107-111
- Precision of fit: the Procera All-Ceram crown.J Prosthet Dent. 1998; 80: 394-404
- A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns.Int J Prosthodont. 1997; 10: 478-484
- Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems.Eur J Oral Sci. 2005; 113: 174-179
- Clinical fit of four-unit zirconia posterior fixed dental prostheses.Eur J Oral Sci. 2008; 116: 579-584
- Fit of all-ceramic posterior fixed partial denture frameworks in vitro.Int J Periodontics Restorative Dent. 2007; 27: 567-575
- In vitro marginal fit of three all-ceramic crown systems before and after cementation.Oper Dent. 2012; 37: 641-649
- Precision of fit: zirconia three-unit fixed dental prostheses.Clin Oral Investig. 2009; 13: 343-349
- Variables affecting the fit of zirconia fixed partial dentures: A systematic review.J Prosthet Dent. 2020; 123: 686-692
- Comparative analysis of two measurement methods for marginal fit in metal-ceramic and zirconia posterior FPDs.Int J Prosthodont. 2009; 22: 374-377
- A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation.J Prosthet Dent. 2009; 102: 378-384
- Influence of framework configuration on the marginal adaptation of zirconium dioxide ceramic anterior four-unit frameworks.Acta Odontol Scand. 2005; 63: 361-366
- Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies.J Prosthet Dent. 2014; 112: 1432-1436
- The fit of cobalt–chromium three-unit fixed dental prostheses fabricated with four different techniques: A comparative in vitro study.Dent Mater. 2011; 27: 356-363
- Internal and marginal fit of cobalt-chromium fixed dental prostheses fabricated with 3 different techniques.J Prosthet Dent. 2015; 114: 686-692
- Comparison of the bond strength of laser-sintered and cast base metal dental alloys to porcelain.Dent Mater. 2008; 24: 1400-1404
- Over-refractory casting technique as an alternative to one-piece multi-unit fixed partial denture frameworks.J Prosthet Dent. 2006; 95: 243-248
- Three-dimensional distortion of gold-alloy castings and welded titanium frameworks. Measurements of the precision of fit between completed implant prostheses and the master casts in routine edentulous situations.J Oral Rehabil. 1995; 22: 557-564
- Machinability of CAD/CAM materials.J Prosthet Dent. 2017; 118: 194-199
- The evolution of rapid prototyping in dentistry: A review.Rapid Prototyp J. 2009; 15: 216-225
- Dimensional changes from the sintering process and fit of Y-TZP copings: Micro-CT analysis.Dent Mater. 2017; 33: e405-e413
- Adaptation of all-ceramic fixed partial dentures.Dent Mater. 2011; 27: 1119-1126
- In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies.J Prosthet Dent. 2016; 116: 368-374
- Evaluation of the fit of metal ceramic restorations fabricated with a pre-sintered soft alloy.J Prosthet Dent. 2016; 116: 909-915
- Adaptation measurement of CAD/CAM dental crowns with X-ray micro-CT: metrological chain standardization and 3D gap size distribution.Adv Mater Sci Eng. 2016; 2016: 1-13
- Effect of in vivo crown margin discrepancies on periodontal health.J Prosthet Dent. 1991; 65: 357-364
- Clinical fit of Procera All-Ceram crowns.J Prosthet Dent. 2000; 84: 419-424
- The fit of metal-ceramic crowns, a clinical study.Dent Mater. 1985; 1: 197-199
- The effect of cement thickness on the fracture strength of all-ceramic crowns.Aust Dent J. 1995; 40: 17-21
- Marginal and internal fits of fixed dental prostheses zirconia retainers.Dent Mater. 2009; 25: 94-102
- Evaluation of marginal and internal fit of ceramic and metallic crown copings using X-ray microtomography (micro-CT) technology.J Prosthet Dent. 2015; 114: 223-228
- Influence of different convergence angles and tooth preparation heights on the internal adaptation of Cerec crowns.J Prosthet Dent. 2002; 87: 248-255
- Micro-CT analysis of Y-TZP copings made by different CAD/CAM systems: marginal and internal fit.Int J Dent. 2018; : 5189767
- Evaluation of the marginal fit of full ceramic crowns by the microcomputed tomography (micro-CT) technique.Eur J Dent. 2014; 8: 437-444
- Bruker micro-CT Academy 2015 Issue 2.(Available at:)https://www.bruker.com/fileadmin/user_upload/8-PDF-Docs/PreclinicalImaging/microCT/ACADEMY/2015issue2.pdfDate accessed: November 25, 2020
- Micro-CT evaluation of the marginal fit of different In-Ceram alumina copings.Eur J Esthet Dent. 2009; 4: 278-292
- The effect of preparation designs on the marginal and internal gaps in Cerec3 partial ceramic crowns.J Dent. 2009; 37: 374-382
- Cement thickness of inlay restorations made of lithium disilicate, polymer-infiltrated ceramic and nano-ceramic CAD/CAM materials evaluated using 3D X-ray micro-computed tomography.J Prosthodont. 2018; 27: 456-460
- Determination of the minimum number of marginal gap measurements required for practical in vitro testing.J Prosthet Dent. 2000; 83: 40-49
- Marginal fit consistency of copy-milled all ceramic crowns during fabrication by light- and scanning-electron-microscopic analysis in vitro.J Oral Rehab. 1997; 24: 871-881
- Clinical relevance of tests on bond strength, microleakage and marginal adaptation.Dent Mater. 2013; 29: 59-84
- Effect of cyclic fatigue tests on aging and their translational implications for survival of all-ceramic tooth-borne single crowns and fixed dental prostheses.J Prosthodont. 2018; 27: 364-375
- Evaluation of model materials for CAD/CAM in vitro studies.Int J Comput Dent. 2020; 23: 49-56
- X-ray microtomographic evaluation of the influence of two preparation types on marginal fit of CAD/CAM alumina copings: a pilot study.Int J Prosthodont. 2012; 25: 170-172
- ImageJ.U.S. National Institutes of Health, Bethesda1997-2018 (Available at:)https://imagej.nih.gov/ij/Date accessed: November 25, 2020
- The two-sample t-test versus Satterthwaite’s approximate f test.Commun Statist-theory Meth. 1989; 18: 3963-3975
Article info
Publication history
Published online: December 03, 2020
Footnotes
Supported in part by the National Council for Scientific Research in Lebanon (protocol no.: 3854) and the Lebanese University.
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
