Abstract
Statement of problem
The use of computer-aided design and computer-aided manufacturing (CAD-CAM) for metal-ceramic
restorations has increased with advances in the technology. However, little is known
about the marginal and internal adaptation of restorations fabricated using laser
sintering (LS) and soft milling (SM). Moreover, the effects of repeated ceramic firings
on the marginal and internal adaptation of metal-ceramic restorations fabricated with
LS and SM is also unknown.
Purpose
The purpose of this in vitro study was to investigate the effects of repeated ceramic
firings on the marginal and internal adaptation of metal-ceramic copings fabricated
using the lost wax (LW), LS, and SM techniques.
Material and methods
Ten LW, 10 LS, and 10 SM cobalt-chromium (Co-Cr) copings were fabricated for an artificial
tooth (Frasaco GmbH). After the application of veneering ceramic (VITA VMK Master;
VITA Zahnfabrik), the marginal and internal discrepancies of these copings were measured
with a silicone indicator paste and a stereomicroscope at ×100 magnification after
the first, second, and third clinical simulated ceramic firing cycles. Repeated measures
2-way ANOVA and the Fisher LSD post hoc test were used to evaluate differences in
marginal and internal discrepancies (α=.05).
Results
Neither fabrication protocol nor repeated ceramic firings had any statistically significant
effect on internal discrepancy values (P>.05). Marginal discrepancy values were also statistically unaffected by repeated
ceramic firings (P>.05); however, the fabrication protocol had a significant effect on marginal discrepancy
values (P<.001), with LW resulting in higher marginal discrepancy values than LS or SM (P<.05). Marginal discrepancy values did not vary between LS and SM (P>.05).
Conclusions
All groups demonstrated clinically acceptable marginal adaptation after repeated ceramic
firing cycles; however, the LS and SM groups demonstrated better marginal adaptation
than that of LW group and may be appropriate clinical alternatives to LW.
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
- Nonprecious alloys for use in fixed prosthodontics: a literature review.J Prosthet Dent. 1983; 49: 363-370
- Alloys for prosthodontic restorations.J Prosthet Dent. 2002; 87: 351-363
- Corrosion evaluation of recasting non-precious dental alloys.Int Dent J. 1995; 45: 209-217
- Crowns and extra-coronal restorations: materials selection.Br Dent J. 2002; 192 (205-11): 199-202
- 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
- Clinical marginal and internal fit of metal ceramic crowns fabricated with a selective laser melting technology.J Prosthet Dent. 2015; 113: 623-627
- Fracture strength of porcelain fused to metal crowns made of cast, milled or laser-sintered cobalt-chromium.Acta Odontol Scand. 2013; 71: 1280-1289
- Internal and marginal fit of cobalt-chromium fixed dental prostheses fabricated with 3 different techniques.J Prosthet Dent. 2015; 114: 686-692
- Clinical marginal and internal fit of crowns fabricated using different CAD/CAM Technologies.J Prosthodont. 2015; 24: 291-295
- 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
- Marginal and internal adaptation of milled cobalt-chromium copings.J Prosthet Dent. 2015; 114: 680-685
- Internal fit evaluation of crowns prepared using a new dental crown fabrication technique: laser-sintered Co-Cr crowns.J Prosthet Dent. 2009; 102: 253-259
- An evaluation of marginal fit of three-unit fixed dental prostheses fabricated by direct metal laser sintering system.Dent Mater. 2013; 29: 91-96
- Three-dimensional evaluation of gaps associated with fixed dental prostheses fabricated with new technologies.J Prosthet Dent. 2014; 112: 1432-1436
- Marginal and internal fit of metal-ceramic crowns fabricated with a new laser melting technology.Dent Mater. 2008; 24: 1311-1315
- The application of rapid prototyping in prosthodontics.J Prosthodont. 2012; 21: 641-644
- Effect of fluoride content on ion release from cast and selective laser melting-processed Co-Cr-Mo alloys.J Prosthet Dent. 2014; 112: 1212-1216
- Computer-aided design and fabrication of dental restorations: current systems and future possibilities.J Am Dent Assoc. 2006; 137: 1289-1296
- Evaluation of marginal fit of CAD/CAM restorations fabricated through cone beam computerized tomography and laboratory scanner data.J Prosthet Dent. 2016; 115: 47-51
- Evaluation of marginal and internal fit of ceramic crown copings.Dent Mater. 2013; 29: 174-180
- Clinical marginal and internal adaptation of CAD/CAM milling, laser sintering, and cast metal ceramic crowns.J Prosthet Dent. 2014; 112: 909-913
- Periodontal conditions in patients 5 years following insertion of fixed prostheses. Pocket depth and loss of attachment.J Oral Rehabil. 1976; 3: 237-243
- Effect of venting on cast gold full crowns.J Prosthet Dent. 1971; 26: 621-626
- A clinical evaluation of fixed bridges, 10 years following insertion.J Oral Rehabil. 1986; 13: 423-432
- The estimation of cement film thickness by an in vivo technique.Br Dent J. 1971; 131: 107-111
- The fit of metal-ceramic crowns, a clinical study.Dent Mater. 1985; 1: 197-199
- The effects of bevel angulation on marginal integrity.J Am Dent Assoc. 1981; 103: 882-885
- Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting.J Prosthet Dent. 2015; 113: 135-139
- 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
- Marginal distortion of the porcelain- bonded-to-metal complete crown: an SEM study.J Prosthet Dent. 1982; 47: 146-153
- A comparison of the marginal and internal adaptation of titanium and gold-platinum-palladium metal ceramic crowns.Int J Prosthodont. 1995; 8: 29-37
- The marginal fit of selective laser melting-fabricated metal crowns: an in vitro study.J Prosthet Dent. 2014; 112: 1437-1440
- Tooth preparations for complete crowns: an art form based on scientific principles.J Prosthet Dent. 2001; 85: 363-376
- Accuracy of ceramic restorations made using an in-office optical scanning technique: an in vitro study.Oper Dent. 2014; 39: 308-316
- Evaluation of the absolute marginal discrepancy of zirconia-based ceramic copings.J Prosthet Dent. 2011; 105: 108-114
- In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies.J Prosthet Dent. 2016; 116: 368-374
Article info
Publication history
Published online: April 03, 2017
Identification
Copyright
© 2017 by the Editorial Council for The Journal of Prosthetic Dentistry.
