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RESEARCH PRODUCT

Influence of thermal and mechanical fatigue on the shear bond strength of different all-ceramic systems

Accácio Lins Do ValleHugo Alberto VidottiElizeu InsaurraldeJosé R. DelbenJefferson Ricardo PereiraLuiz F. Plaça

subject

Materials scienceScanning electron microscopemedicine.medical_treatment0206 medical engineering02 engineering and technology03 medical and health sciences0302 clinical medicineCISALHAMENTOmedicineCubic zirconiaCeramicComposite materialGeneral DentistryProsthetic DentistryBond strengthResearch030206 dentistry:CIENCIAS MÉDICAS [UNESCO]020601 biomedical engineeringChemical bondvisual_artUNESCO::CIENCIAS MÉDICASFracture (geology)visual_art.visual_art_mediumVeneerAdhesive

description

BACKGROUND To evaluate the influence of thermal and mechanical fatigue on the shear bond strength of different all-ceramic cores and veneering porcelain interfaces. MATERIAL AND METHODS All-ceramic systems tested were lithium disilicate and zirconia veneered by layering technique. Sixty specimens (n=20) were subjected to shear bond strength. Ten of them were thermal and mechanical cycled. Fracture analysis was performed with stereomicroscopy and scanning electron microscopy. Energy dispersive X-ray spectroscopy analysis was performed across core/veneer interfaces. RESULTS Thermal and mechanical cycling did not influence on bond strength. However, there was significant difference among systems (<0.01). CoCr group presented the highest values, followed by lithium disilicate, and zirconia. Failure modes were predominantly adhesive for CoCr, cohesive in core for lithium disilicate, and cohesive in veneer for zirconia. Energy dispersive X-ray showed interaction zone for CoCr and lithium disilicate groups and was inconclusive for zirconia. Fatigue had no influence on bond strength of groups tested. CONCLUSIONS The results suggest that there is a chemical bond between core and veneer materials for CoCr and lithium disilicate groups. Key words:Ceramics, electron microscopy, fatigue, mechanical stress, shear bond strength.

yearjournalcountryeditionlanguage
2017-08-01
http://hdl.handle.net/10550/63047