Effect of hydrofluoric acid etching duration on the roughness and flexural strength of a lithium disilicate-based glass ceramic

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorZogheib, Lucas Villaça
dc.creatorDella Bona, Alvaro
dc.creatorKimpara, Estevão Tomomitsu
dc.creatorMccabe, John F.
dc.date2014-05-27T11:25:52Z
dc.date2016-10-25T18:33:54Z
dc.date2014-05-27T11:25:52Z
dc.date2016-10-25T18:33:54Z
dc.date2011-05-13
dc.date.accessioned2017-04-06T01:50:26Z
dc.date.available2017-04-06T01:50:26Z
dc.identifierBrazilian Dental Journal, v. 22, n. 1, p. 45-50, 2011.
dc.identifier0103-6440
dc.identifier1806-4760
dc.identifierhttp://hdl.handle.net/11449/72424
dc.identifierhttp://acervodigital.unesp.br/handle/11449/72424
dc.identifier10.1590/S0103-64402011000100008
dc.identifierS0103-64402011000100008
dc.identifier2-s2.0-79955756257.pdf
dc.identifier2-s2.0-79955756257
dc.identifierhttp://dx.doi.org/10.1590/S0103-64402011000100008
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/893295
dc.descriptionThe aim of this study was to examine the effect of different acid etching times on the surface roughness and flexural strength of a lithium disilicate-based glass ceramic. Ceramic bar-shaped specimens (16 mm x 2 mm x 2 mm) were produced from ceramic blocks. All specimens were polished and sonically cleaned in distilled water. Specimens were randomly divided into 5 groups (n=15). Group A (control) no treatment. Groups B-E were etched with 4.9% hydrofluoric acid (HF) for 4 different etching periods: 20 s, 60 s, 90 s and 180 s, respectively. Etched surfaces were observed under scanning electron microscopy. Surface profilometry was used to examine the roughness of the etched ceramic surfaces, and the specimens were loaded to failure using a 3-point bending test to determine the flexural strength. Data were analyzed using one-way ANOVA and Tukey's test (α=0.05). All etching periods produced significantly rougher surfaces than the control group (p<0.05). Roughness values increased with the increase of the etching time. The mean flexural strength values were (MPa): A=417 ± 55; B=367 ± 68; C=363 ± 84; D=329 ± 70; and E=314 ± 62. HF etching significantly reduced the mean flexural strength as the etching time increased (p=0.003). In conclusion, the findings of this study showed that the increase of HF etching time affected the surface roughness and the flexural strength of a lithium disilicate-based glass ceramic, confirming the study hypothesis.
dc.languageeng
dc.relationBrazilian Dental Journal
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectCAD/CAM
dc.subjectFlexural strength
dc.subjectHydrofluoric acid
dc.subjectLithium disilicate glass ceramic
dc.subjectRoughness
dc.subjecthydrofluoric acid
dc.subjectlithia disilicate
dc.subjectchemistry
dc.subjectdental acid etching
dc.subjectdental bonding
dc.subjectdental care
dc.subjectmaterials testing
dc.subjectmethodology
dc.subjectpliability
dc.subjectrandomization
dc.subjectscanning electron microscopy
dc.subjectsurface property
dc.subjecttime
dc.subjecttooth prosthesis
dc.subjectAcid Etching, Dental
dc.subjectDental Bonding
dc.subjectDental Porcelain
dc.subjectDental Stress Analysis
dc.subjectHydrofluoric Acid
dc.subjectMaterials Testing
dc.subjectMicroscopy, Electron, Scanning
dc.subjectPliability
dc.subjectRandom Allocation
dc.subjectSurface Properties
dc.subjectTime Factors
dc.titleEffect of hydrofluoric acid etching duration on the roughness and flexural strength of a lithium disilicate-based glass ceramic
dc.typeOtro


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