Effects of artificial aging conditions on yttria-stabilized zirconia implant abutments
| Autor: | João Neudenir Arioli Filho, Gildo Coelho Santos Junior, Amin S. Rizkalla, Mariana de Almeida Basílio, Selma Gutierrez Antonio, Kátia Vieira Cardoso |
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| Přispěvatelé: | School of Dentistry, Universidade Estadual Paulista (Unesp), Schulich School of Medicine & Dentistry, Metropolitan Union Educ & Culture, Western Univ |
| Rok vydání: | 2016 |
| Předmět: |
Dental Stress Analysis
Materials science Surface Properties Scanning electron microscope Abutment chemistry.chemical_element Dental Abutments 02 engineering and technology Temperature cycling In Vitro Techniques 03 medical and health sciences 0302 clinical medicine Phase (matter) Medicine and Health Sciences Humans Yttrium Composite material Yttria-stabilized zirconia Zirconium business.industry 030206 dentistry Structural engineering 021001 nanoscience & nanotechnology Microstructure chemistry Microscopy Electron Scanning Oral Surgery 0210 nano-technology business |
| Zdroj: | Bone and Joint Institute ResearcherID Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Web of Science |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/j.prosdent.2016.01.011 |
| Popis: | Made available in DSpace on 2018-12-11T17:01:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-08-01 Statement of problem Most ceramic abutments are fabricated from yttria-stabilized tetragonal zirconia (Y-TZP). However, Y-TZP undergoes hydrothermal degradation, a process that is not well understood. Purpose The purpose of this in vitro study was to assess the effects of artificial aging conditions on the fracture load, phase stability, and surface microstructure of a Y-TZP abutment. Material and methods Thirty-two prefabricated Y-TZP abutments were screwed and tightened down to external hexagon implants and divided into 4 groups (n = 8): C, control; MC, mechanical cycling (1×106 cycles; 10 Hz); AUT, autoclaving (134°C; 5 hours; 0.2 MPa); and TC, thermal cycling (104 cycles; 5°/55°C). A single-load-to-fracture test was performed at a crosshead speed of 0.5 mm/min to assess the assembly's resistance to fracture (ISO Norm 14801). X-ray diffraction (XRD) analysis was applied to observe and quantify the tetragonal-monoclinic (t-m) phase transformation. Representative abutments were examined with high-resolution scanning electron microscopy (SEM) to observe the surface characteristics of the abutments. Load-to-fracture test results (N) were compared by ANOVA and Tukey test (α=.05). Results XRD measurements revealed the monoclinic phase in some abutments after each aging condition. All the aging conditions reduced the fracture load significantly (P |
| Databáze: | OpenAIRE |
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