Hard machining, glaze firing and hydrofluoric acid etching: Do these procedures affect the flexural strength of a leucite glass–ceramic?

Fraga, Sara; Valandro, Luiz Felipe; Bottino, Marco Antônio; May, Liliana Gressler

doi:10.1016/j.dental.2015.04.005

Cited by 47 publications

(35 citation statements)

References 13 publications

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“…Typically, after milling process the surface of zirconia blocks have surface roughness of approximately R a : 1.37 µm and R z : 8.8 µm 10 depending on the roughness of the milling burs and milling parameters [19]. Polishing with silicone carbide abrasive or air-abrasion certainly eliminates the initial roughness and grooves that occur during milling process, resulting in a smoother surface.…”

Section: Discussionmentioning

confidence: 99%

Could readily silanized silica particles substitute silica coating and silanization in conditioning zirconium dioxide for resin adhesion?

Özcan

Yetkiner

2015

Journal of Adhesion Science and Technology

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Particle deposition with silica-coated alumina followed by silane application increase the physico-chemical interaction between the resin cement and zirconia.Unfortunately, due to hydrolytic degradation of the silane, achieved adhesion decreases after aging conditions. Recently, readily silanized silica particles became available, that eliminates silanization procedures. This study investigated the effect of particle types with different morphology and surface properties on the surface wettability and adhesion of resin cement to zirconia after aging. Zirconia specimens (5x5x1 mm 3 ) (Emax ZirCAD, Ivoclar)were wet polished to 1200 grit silicone carbide abrasive and ultrasonically cleaned.Specimens were randomly assigned to one of the following surface conditioning protocols Failure types were exclusively adhesive in all groups. Weibull distribution presented lower 3 shape ( 0 ) for AL (7.7) and SIL (5.3) and the highest for SILP (10.8). Silane coated silica particles (SilJet Plus) presented better wettability on zirconia than with alumina or alumina particles coated with silica and provided similar bond strength on zirconia obtained with silica coated and silanized surfaces. Since no silane application is needed with readily silanized silica particles, it may be used as a substitute for conventional silica coating and silanization, reducing the clinical procedures.

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Section: Discussionmentioning

confidence: 99%

Could readily silanized silica particles substitute silica coating and silanization in conditioning zirconium dioxide for resin adhesion?

Özcan

Yetkiner

2015

Journal of Adhesion Science and Technology

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“…Clinically, an appropriate strength characteristics is an important aspect of dental restoration. According to previous studies, the long-term strength properties of all-ceramic restorations depend upon several factors, such as fabrication type [14][15][16][17] , laboratory procedures [18][19][20][21] , core or veneer thickness 4,7,22) , fatique resistance 23) , luting procedure 24,25) , and aging 11,14,[26][27][28] . Thus, it is important to determine the mechanical behavior of this category of dental materials in vitro.…”

Section: Introductionmentioning

confidence: 99%

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

et al. 2017

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The purpose of this study was to investigate the flexural strength of all-ceramics with varying core thicknesses submitted to aging. In-Ceram Alumina (IC), IPS e.max Press (EM) and Katana (K) (n=40), were selected. Each group contained two core groups based on the core thickness as follows: IC/0.5, IC/0.8, EM/0.5, EM/0.8, K/0.5 and K/0.8 mm in thickness (n=20 each). Ten specimens from each group were subjected to aging and all specimens were tested for strength in a testing machine either with or without being subjected aging. The mean strength of the K were higher (873.05 MPa) than that of the IC (548.28 MPa) and EM (374.32 MPa) regardless of core thickness. Strength values increased with increasing core thickness for all IC, EM and K regardless of aging. Results of this study concluded that strength was not significantly affected by aging. Different core thicknesses affected strength of the all-ceramic materials tested (p<0.05).

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“…Many studies showed that glazing did not increase the biaxial flexural strength of the ceramics 10,24,25) . Fraga, et al 26) concluded that glaze firing for machinable leucite-reinforced glass-ceramic blocks (Empress CAD) reduced the strength characteristics and suggested that alteration of the material microstructure and the growth of micro cracks and residual stress occur due to the large mismatch in coefficients of thermal expansion between the leucite crystals and the glass matrix. According to the results of the study, glazing technique increased the flexural strength of machinable leucite-reinforced glass ceramic.…”

Section: Discussionmentioning

confidence: 99%

Influence of different surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics

et al. 2019

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The effect of surface finishing techniques on machinable ceramics to obtain optimum smoothness is unclear. The aim of the study was to evaluate the effects of surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics. Forty specimens were divided into four subgroups according to surface finishing techniques and ceramic structure. A profilometer was used to evaluate surface roughness. A spectrophotometer was used to obtain the CIE L*, a* and b* coordinates. All specimens were subjected to a threepoint bending test to determine flexural strength. All data were analyzed with two-way ANOVA and Tukey's HSD tests (p<0.05). Polishing techniques were found to be more effective than the glazing method to obtain smooth surfaces. Glazing technique increased the flexural strength of leucite-reinforced ceramics. Finishing procedures have different effects on the success of the restorations and must be considered by the clinicians.

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Hard machining, glaze firing and hydrofluoric acid etching: Do these procedures affect the flexural strength of a leucite glass–ceramic?

Cited by 47 publications

References 13 publications

Could readily silanized silica particles substitute silica coating and silanization in conditioning zirconium dioxide for resin adhesion?

Could readily silanized silica particles substitute silica coating and silanization in conditioning zirconium dioxide for resin adhesion?

Influence of core thickness and artificial aging on the biaxial flexural strength of different all-ceramic materials: An <i>in-vitro</i> study

Influence of different surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics

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