Influence of spark erosion on the fit of screw-retained Co-Cr fixed complete denture frameworks veneered with different materials

Spark erosion is a fit corrective technology that can be used even after the veneering material has been applied. The framework does not require sectioning, thus preserving its mechanical resistance. However, the spark erosion effect on veneered Co-Cr fixed complete denture (FCD) frameworks has not...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2018-05, Vol.119 (5), p.797-803
Main Authors: Presotto, Anna Gabriella Camacho, Oliveira, Luciana Valadares, Pisani, Marina Xavier, Barão, Valentim Adelino Ricardo, Mesquita, Marcelo Ferraz
Format: Article
Language:English
Subjects:
Chromium Alloys - chemistry
Dental Alloys - chemistry
Dental Marginal Adaptation
Dental Veneers
Dentistry
Denture Design
Denture, Complete
Electrochemical Techniques
In Vitro Techniques
Materials Testing
Stress, Mechanical
Surface Properties
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Summary:Spark erosion is a fit corrective technology that can be used even after the veneering material has been applied. The framework does not require sectioning, thus preserving its mechanical resistance. However, the spark erosion effect on veneered Co-Cr fixed complete denture (FCD) frameworks has not been investigated. The purpose of this in vitro study was to evaluate whether spark erosion is effective in improving marginal fit on screw-retained Co-Cr FCD frameworks veneered with different materials. A comparison between ceramic applications and simulated ceramic firing cycles was also investigated. Forty FCD frameworks were fabricated with a Co-Cr alloy. Four groups (n=10) were obtained according to the veneer material used on frameworks: HR (heat-polymerized resin); LR (light-polymerized resin); C (ceramic); and SC (simulated ceramic firing cycle). The spark erosion process was conducted for all groups. The marginal fit was analyzed according to the single-screw test protocol, and the measurements were performed at 3 evaluation times: initial, after veneer material application, and after spark erosion process. The results were submitted to a 2-way repeated measures ANOVA and the Tukey honest significant differences test (α=.05). Poorer marginal fit (in micrometers) was noted after veneer material application, where the HR and C groups presented the worst values (HR: 170; LR: 72; C: 165; SC: 86; P
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2017.07.003