Assessment of reliability of CAD-CAM tooth-colored implant custom abutments
| Autor: | Nuno Marques Guilherme, Cheng Zheng, Ariel J. Raigrodski, Kwok Hung Chung, Brian D. Flinn |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Dental Stress Analysis
Materials science Composite number Abutment chemistry.chemical_element Dental Abutments 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Dental porcelain Ultimate tensile strength Alloys Humans Composite material Acrylic resin Dental Implants Titanium Microscopy business.industry Reproducibility of Results Dental Implant-Abutment Design 030206 dentistry Structural engineering 021001 nanoscience & nanotechnology Dental Porcelain Resins Synthetic chemistry visual_art Microscopy Electron Scanning visual_art.visual_art_medium Computer-Aided Design Zirconium Implant Oral Surgery 0210 nano-technology business |
| Zdroj: | The Journal of Prosthetic Dentistry. 116:206-213 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/j.prosdent.2015.12.015 |
| Popis: | Statement of problem Information is lacking about the fatigue resistance of computer-aided design and computer-aided manufacturing (CAD-CAM) tooth-colored implant custom abutment materials. Purpose The purpose of this in vitro study was to investigate the reliability of different types of CAD-CAM tooth-colored implant custom abutments. Material and methods Zirconia (Lava Plus), lithium disilicate (IPS e.max CAD), and resin-based composite (Lava Ultimate) abutments were fabricated using CAD-CAM technology and bonded to machined titanium-6 aluminum-4 vanadium (Ti-6Al-4V) alloy inserts for conical connection implants (NobelReplace Conical Connection RP 4.3×10 mm; Nobel Biocare). Three groups (n=19) were assessed: group ZR, CAD-CAM zirconia/Ti-6Al-4V bonded abutments; group RC, CAD-CAM resin-based composite/Ti-6Al-4V bonded abutments; and group LD, CAD-CAM lithium disilicate/Ti-6Al-4V bonded abutments. Fifty-seven implant abutments were secured to implants and embedded in autopolymerizing acrylic resin according to ISO standard 14801. Static failure load (n=5) and fatigue failure load (n=14) were tested. Weibull cumulative damage analysis was used to calculate step-stress reliability at 150-N and 200-N loads with 2-sided 90% confidence limits. Representative fractured specimens were examined using stereomicroscopy and scanning electron microscopy to observe fracture patterns. Results Weibull plots revealed β values of 2.59 for group ZR, 0.30 for group RC, and 0.58 for group LD, indicating a wear-out or cumulative fatigue pattern for group ZR and load as the failure accelerating factor for groups RC and LD. Fractographic observation disclosed that failures initiated in the interproximal area where the lingual tensile stresses meet the compressive facial stresses for the early failure specimens. Plastic deformation of titanium inserts with fracture was observed for zirconia abutments in fatigue resistance testing. Conclusions Significantly higher reliability was found in group ZR, and no significant differences in reliability were determined between groups RC and LD. Differences were found in the failure characteristics of group ZR between static and fatigue loading. |
| Databáze: | OpenAIRE |
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