Influence of the CAD-CAM systems on the marginal accuracy and mechanical properties of dental restorations
| Autor: | Roberto Padrós, José Vicente Ríos-Santos, Carlos Falcao-Costa, Luis Giner, Mariano Herrero-Climent, Francisco Javier Gil |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
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Materials science Scanning electron microscope Surface Properties Health Toxicology and Mutagenesis lcsh:Medicine CAD Odontología 616.3 02 engineering and technology Surface finish mechanical properties CAD-CAM Odontologia Article 03 medical and health sciences 0302 clinical medicine Flexural strength Materials Testing Range (statistics) Alloys Denture Design Aleaciones White light interferometry Dental prosthesis lcsh:R Dental implants Public Health Environmental and Occupational Health dental prosthesis 030206 dentistry 021001 nanoscience & nanotechnology Pròtesis dentals Aliatges Computer-Aided Design Denture Partial Fixed marginal fit Cr-Co alloy Zirconium Prótesis dentales 0210 nano-technology Odontology Biomedical engineering |
| Zdroj: | International Journal of Environmental Research and Public Health International Journal of Environmental Research and Public Health, Vol 17, Iss 4276, p 4276 (2020) Volume 17 Issue 12 |
| Popis: | The aim of this study was to compare the quality of different computer-assisted-design and computer assisted manufacturing systems (CAD-CAM) generated by only one scanner, focusing on vertical fit discrepancies and the mechanical properties. A master model was obtained from a real clinical situation: the replacement of an absent (pontic) tooth, with the construction of a fixed partial denture on natural abutments with three elements. Nine scans were performed by each tested and 36 copies were designed using a dental CAD-CAM software (Exocad). The frameworks were manufactured using three-axis and five-axis, with the same batch of the chrome-cobalt (CrCo) alloy. The frameworks were not cemented. A focus ion beam-high resolution scanning electron microscope (FIB-HRSEM) allowed us to obtain the vertical gap measurements in five points for each specimen. Roughness parameters were measured using white light interferometry (WLI). The samples were mechanically characterized by means of flexural tests. A servo-hydraulic testing machine was used with a cross-head rate of 1 mm/min. One-way ANOVA statistical analysis was performed to determine whether the vertical discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values ranged: from 92.38 ± 19.24 µ m to 19.46 ± 10.20 µ m, for the samples produced by three-axis and five-axis machines, respectively. Roughness was lower in the five-axis machine than the three-axis one, and as a consequence, the surface quality was better when the five-axis machine was used. These results revealed a statistically significant difference (p < 0.005) in the mean marginal gap between the CAD-CAM systems studied. The flexural strength for these restorations range from 6500 to 7000 N, and does not present any statistical differences&rsquo significance between two CAD-CAM systems studied. This contribution suggests that the number of axes improves vertical fit and surface quality due to the lower roughness. These claims show some discrepancies with other studies. |
| Databáze: | OpenAIRE |
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