Abstract
Statement of problem
The change in fit after ceramic layering of additively manufactured cobalt-chromium
alloy frameworks has not been evaluated extensively.
Purpose
The purpose of this in vitro study was to compare the fit of cobalt-chromium alloy
fixed dental prostheses fabricated by different techniques before and after ceramic
layering.
Material and methods
A cobalt-chromium alloy master model was prepared to receive a 3-unit fixed dental
prosthesis. Sixty cobalt-chromium alloy frameworks (N=60) were manufactured by using
3 manufacturing techniques (n=20): selective laser melting (Mediloy S-Co), soft milling
(Ceramill Sintron), and conventional casting as the control group (Girobond NB). The
replica technique was used to measure the marginal and internal discrepancies. The
frameworks were then layered with ceramic, and the same fit measuring procedure was
repeated. The results were compared before and after ceramic layering within each
group. The data were analyzed using the Levene, ANOVA, and paired-samples t tests (α=.05).
Results
A significant difference was found within groups before and after ceramic layering
for selective laser melting (P=.006) and soft milling (P=.009) but not for conventional casting (P>.05). No statistical difference was reported in the marginal region for conventional
casting group (P=.155) in contrast with the soft milling and selective laser melting groups (P=.003). Soft milling showed increased gap values in the marginal (P=.006) and occlusal regions (P=.004).
Conclusions
Ceramic layering increased the discrepancy of the laser-sintered and milled frameworks,
increasing the marginal discrepancy.
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References
- Precision of fit: zirconia three-unit fixed dental prostheses.Clin Oral Investig. 2009; 13: 343-349
- Adaptation of all-ceramic fixed partial dentures.Dent Mater. 2011; 27: 1119-1126
- Micro-CT evaluation of marginal and internal fit of cemented polymer infiltrated ceramic network material crowns manufactured after conventional and digital impressions.J Prosthodont Res. 2019; 63: 40-46
- 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
- A systematic review of the survival and complication rates of zirconia-ceramic and metal-ceramic multiple-unit fixed dental prostheses.Clin Oral Implants Res. 2018; 29 Suppl16: 184-198
- A systematic review of the survival and complication rates of zirconia-ceramic and metal-ceramic single crowns.Clin Oral Implants Res. 2018; 29: 199-214
- Evaluation of marginal and internal fit of ceramic crown copings.Dent Mater. 2013; 29: 174-180
- Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies.J Prosthet Dent. 2014; 112: 1432-1436
- Comparison of the bond strength of laser-sintered and cast base metal dental alloys to porcelain.Dent Mater. 2008; 24: 1400-1404
- Marginal adaptation of titanium frameworks produced by CAD/CAM techniques.Int J Prosthodont. 1997; 10: 541-546
- A review of dental CAD/CAM: current status and future perspectives from 20 years of experience.Dent Mater J. 2009; 28: 44-56
- Status of current CAD/CAM technology in dental medicine.Int J Comput Dent. 2004; 7: 25-45
- Evaluation of marginal fit of single implant-supported metal-ceramic crowns prepared by using presintered metal blocks.J Prosthet Dent. 2018; 119: 257-262
- 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
- Evaluation of the marginal and internal gap of metal-ceramic crown fabricated with a selective laser sintering technology: two- and three-dimensional replica techniques.J Adv Prosthodont. 2013; 5: 179-186
- Structural characterization of biomedical Co-Cr-Mo components produced by direct metal laser sintering.Mater Sci Eng C Mater Biol Appl. 2015; 48: 263-269
- Challenges of Co–Cr alloy additive manufacturing methods in dentistry—the current state of knowledge (systematic review).Materials (Basel). 2020; 13: 3524
- Additive manufacturing technologies used for 3D metal printing in dentistry.Curr Oral Health Rep. 2017; 4: 201-208
- 3D metal printing - additive manufacturing technologies for frameworks of implant-borne fixed dental prosthesis.Eur J Prosthodont Restor Dent. 2017; 25: 143-147
- Model of the primary rearrangement processes at liquid phase sintering and selective laser sintering due to biparticle interactions.J Appl Phys. 1999; 86: 4008-4017
- Marginal fit of metal-ceramic crowns fabricated by using a casting and two selective laser melting processes before and after ceramic firing.J Prosthet Dent. 2019; 122: 475-481
- Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting.J Prosthet Dent. 2015; 113: 135-139
- Review of selective laser melting: Materials and applications.Appl Phys Rev. 2015; 2: 1-21
- Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns.J Adv Prosthodont. 2010; 2: 33-38
- Marginal adaptation of ceramic crowns: a systematic review.J Prosthet Dent. 2013; 110: 447-454
- A comparison study of marginal and internal fit assessment methods for fixed dental prostheses.J Clin Med. 2019; 8: 785
- In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies.J Prosthet Dent. 2016; 116: 368-374
- Effect of repeated ceramic firings on the marginal and internal adaptation of metal-ceramic restorations fabricated with different CAD-CAM technologies.J Prosthet Dent. 2017; 118: 672-677
- Discrepancy at the implant abutment-prosthesis interface of complete-arch cobalt-chromium implant frameworks fabricated by additive and subtractive technologies before and after ceramic veneering.J Prosthet Dent. 2021; 125: 795-803
- Marginal discrepancy changes at various stages of construction of three-unit porcelain fused-to-metal fixed partial dentures.Dent Mater. 1988; 4: 296-301
- Influence of cold working and thermal treatment on the fit of implant-supported metal-ceramic fixed partial dentures.J Prosthet Dent. 2002; 88: 159-169
- Stress-relieving and porcelain firing cycle influence on marginal fit of commercially pure titanium and titanium-aluminum-vanadium copings.Dent Mater. 2003; 19: 686-691
- Accuracy of three corrective techniques for implant bar fabrication.J Prosthet Dent. 2000; 84: 602-607
- Distortion of ceramo-metal fixed partial dentures during the firing cycle.J Prosthet Dent. 1981; 45: 507-514
- The fit of cast and premachined implant abutments.J Prosthet Dent. 1998; 80: 184-192
- Effect of metal selection and porcelain firing on the marginal accuracy of titanium-based metal ceramic restorations.J Prosthet Dent. 2010; 103: 45-52
- An investigation of new metal framework design for metal ceramic restorations.J Prosthet Dent. 1997; 78: 295-301
- Over-refractory casting technique as an alternative to one-piece multi-unit fixed partial denture frameworks.J Prosthet Dent. 2006; 95: 243-248
- 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
- Marginal fit and photoelastic stress analysis of CAD-CAM and overcast 3-unit implant-supported frameworks.J Prosthet Dent. 2017; 117: 373-379
Mediloy S-Co Co63.9Cr24.7W5.4Mo5.0Si CE 0197. Available at: https://sinteo.cz/wp-content/uploads/mediloy-s-co_instruction-for-use.pdf. (Accessed May 12, 2021.)
- Internal and marginal fit of cobaltchromium fixed dental prostheses fabricated with 3 different techniques.J Prosthet Dent. 2015; 114: 686-692
- Evaluation of the marginal fit of three margin designs of resin composite crowns using CAD-CAM.J Dent. 2007; 35: 68-73
- Scanning electron microscopy in modern dentistry research.Braz Dent Sci. 2012; 15: 43-48
- Evaluation of the fit of metal ceramic restorations fabricated with a pre-sintered soft alloy.J Prosthet Dent. 2016; 116: 909-915
- A systematic review on the accuracy of manufacturing techniques for cobalt chromium fixed dental prostheses.Biomater Investig Dent. 2020; 7: 31-40
Article info
Publication history
Published online: May 22, 2021
Footnotes
Supported in part by the National Council for Scientific Research in Lebanon (Protocol N⁰; 3854) and Lebanese University.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
