{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T07:00:08Z","timestamp":1769842808399,"version":"3.49.0"},"reference-count":23,"publisher":"Bentham Science Publishers Ltd.","issue":"1","license":[{"start":{"date-parts":[[2016,3,15]],"date-time":"2016-03-15T00:00:00Z","timestamp":1458000000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/legalcode"}],"content-domain":{"domain":["opendentistryjournal.com","benthamopen.com"],"crossmark-restriction":true},"short-container-title":["TODENTJ"],"published-print":{"date-parts":[[2016,3,15]]},"abstract":"<jats:sec><jats:title>Background:<\/jats:title><jats:p>Glass-ionomer cements perform a protective effect on the dentin-pulp complex considering the F ions release and chemical bonding to the dental structures. On the other hand, those materials have poor physic-mechanical properties in comparison with the restorative resin composite. The main aim of this work was to evaluate the influence of zirconia and\/or alumina fillers on the microstructure and strength of a resin modified glass-ionomer cement after thermal cycling.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p>An<jats:italic>in vitro<\/jats:italic>experimental study was carried out on 9 groups (<jats:italic>n<\/jats:italic>= 10) of cylindrical samples (6 x 4 mm) made from resin modified glass-ionomer (Vitremer, 3M, USA) with different contents of alumina and\/or zirconia fillers. A nano-hybrid resin composite was tested as a control group. Samples were mechanically characterized by axial compressive tests and electron scanning microscopy (SEM) coupled to energy dispersive X-ray spectrophotometry (EDS), before and after thermal cycling. Thermal cycling procedures were performed at 3000, 6000 and 10000 cycles in Fusayama\u00b4s artificial saliva at 5 and 60<jats:sup>o<\/jats:sup>C.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>An improvement of compressive strength was noticed on glass-ionomer reinforced with alumina fillers in comparison with the commercial glass ionomer. SEM images revealed the morphology and distribution of alumina or zirconia in the microstructure of glass-ionomers. Also, defects such as cracks and pores were detected on the glass-ionomer cements. The materials tested were not affected by thermal cycling in artificial saliva.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion:<\/jats:title><jats:p>Addition of inorganic particles at nano-scale such as alumina can increase the mechanical properties of glass-ionomer cements. However, the presence of cracks and pores present in glass-ionomer can negatively affect the mechanical properties of the material because they are areas of stress concentration.<\/jats:p><\/jats:sec>","DOI":"10.2174\/1874210601610010058","type":"journal-article","created":{"date-parts":[[2016,3,15]],"date-time":"2016-03-15T12:12:42Z","timestamp":1458043962000},"page":"58-68","update-policy":"https:\/\/doi.org\/10.2174\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Effect of Zirconia and Alumina Fillers on the Microstructure and Mechanical Strength of Dental Glass Ionomer Cements"],"prefix":"10.2174","volume":"10","author":[{"given":"J\u00falio C. 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