Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system
| Autor: | Renata Marques de Melo, Viviane Maria Gonçalves de Figueiredo, Eduardo Bressiani, Marcia Carneiro Valera, Marco Antonio Bottino, Yu Zhang, Sarina Maciel Braga Pereira |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), NYU |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Dental Stress Analysis
Ceramics Hot Temperature Time Factors Materials science Mechanical stress Surface Properties 02 engineering and technology Bending Indentation hardness 03 medical and health sciences 0302 clinical medicine Flexural strength Reference Values Tensile Strength Indentation Materials Testing Ultimate tensile strength Cubic zirconia Dental Restoration Failure Hardness Tests Ceramic Composite material Pliability General Dentistry Analysis of Variance Microscopy Confocal Reproducibility of Results Fracture mechanics 030206 dentistry 021001 nanoscience & nanotechnology Dental Porcelain lcsh:RK1-715 Confocal microscopy visual_art lcsh:Dentistry Porcelain visual_art.visual_art_medium Original Article Zirconium 0210 nano-technology |
| Zdroj: | Journal of Applied Oral Science v.25 n.5 2017 Journal of applied oral science Universidade de São Paulo (USP) instacron:USP Journal of Applied Oral Science, Volume: 25, Issue: 5, Pages: 566-574, Published: OCT 2017 Journal of Applied Oral Science, Vol 25, Iss 5, Pp 566-574 Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Journal of Applied Oral Science |
| ISSN: | 1678-7757 |
| Popis: | Made available in DSpace on 2018-11-26T17:41:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-09-01. Added 1 bitstream(s) on 2021-07-15T15:20:42Z : No. of bitstreams: 1 S1678-77572017000500566.pdf: 724051 bytes, checksum: 1d4019096bcad38817ac53560b57f3c2 (MD5) US National Institute of Dental and Craniofacial Research Grant Objective: This study evaluated the influence of porcelain (VM9, VITA Zahnfabrik, Germany) thickness on the flexural strength and crack propagation in bilayered zirconia systems (YZ, VITA Zahnfabrik, Germany). Material and Methods: Thirty zirconia bars (20.0x4.0x1.0 mm) and six zirconia blocks (12.0x7.5x1.2 mm) were prepared and veneered with porcelain with different thickness: 1 mm, 2 mm, or 3 mm. The bars of each experimental group (n=10) were subjected to four-point flexural strength testing. In each ceramic block, a Vickers indentation was created under a load of 10 kgf for 10 seconds, for the propagation of cracks. Results: The results of flexural strength were evaluated by One-way ANOVA and Tukey's test, with a significance level of 5%. The factor thickness of the porcelain was statistically significant (p=0.001) and the 1-mm group presented the highest values of flexural strength. The cracks were predominant among the bending specimens with 1 and 2 mm of porcelain, and catastrophic failures were found in 50% of 3-mm-thick porcelain. After the indentation of blocks, the most severe defects were observed in blocks with 3-mm-thick porcelain. Conclusion: The smallest (1 mm) thickness of porcelain on the zirconia infrastructure presented higher values of flexural strength. Better resistance to defect propagation was observed near the porcelain/ zirconia interface for all groups. Higher flexural strength was found for a thinner porcelain layer in a bilayered zirconia system. The damage caused by a Vickers indentation near and far the interface with the zirconia shows that the stress profiles are different. Univ Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Mat Odontol & Protese, Ave Engenheiro Francisco Jose Longo 777, BR-12245000 Sao Jose Dos Campos, SP, Brazil Univ Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Odontol Restauradora, Sao Jose Dos Campos, SP, Brazil NYU, Coll Dent Biomat & Biomimet, New York, NY USA Univ Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Mat Odontol & Protese, Ave Engenheiro Francisco Jose Longo 777, BR-12245000 Sao Jose Dos Campos, SP, Brazil Univ Estadual Paulista, Inst Ciencia & Tecnol Sao Jose dos Campos, Dept Odontol Restauradora, Sao Jose Dos Campos, SP, Brazil US National Institute of Dental and Craniofacial Research Grant: 2R01 DE017925 |
| Databáze: | OpenAIRE |
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