The effect of core:dentin thickness ratio on the bi-axial flexure strength and fracture mode and origin of bilayered dental ceramic composites

Fleming, Garry J.P.; El-Lakwah, Sherin F.A; Harris, J. R.; Marquis, P. M.

doi:10.1016/j.dental.2004.01.005

Cited by 27 publications

(38 citation statements)

References 17 publications

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“…Their ability to yield relatively smooth surfaces, which minimizes plaque deposition and tissue inflammation, is another important reason for their preference in dental applications. Therefore, the degree of surface roughness of dental ceramics and its effect on biocompatibility have been widely studied [1][2][3][4][5][6][7][8][9]. Surface roughness also determines the degree of abrasion caused by one tooth on another.…”

Section: Introductionmentioning

confidence: 99%

Effect of various treatment and glazing (coating) techniques on the roughness and wettability of ceramic dental restorative surfaces

Aksoy¹,

Polat

et al. 2006

Colloids and Surfaces B: Biointerfaces

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Surface treatment procedures such as grinding and polishing are needed to provide the ceramic dental restorative materials with proper fitting and occlusion. The treated surfaces are customarily glazed to improve the strength and smoothness. Though smoothness and wetting of the dental surfaces are important to minimize bacterial plaque retention, influence of the surface treatment and glazing procedures on the final surface roughness and its correlation to wettability are overlooked.In this work, effect of various treatment (diamond fraising, stoning, sanding and aluminum oxide and rubber polishing) and glazing (auto and overglazing) techniques on the final roughness and the resulting wettability of dental ceramic surfaces were investigated using scanning electron microscopy (SEM) observations and atomic force microscopy (AFM) scans, 75 scans per sample. The surfaces were characterized and assigned an average roughness measure, R a . The wettability of the same surfaces was evaluated using micro-contact angle measurements (25 micro-bubbles placed on a grid on each surface) to correlate the final surface roughness and wettability.The results show that overglazing prevails over surface irregularities from different treatment procedures and provides homegeneously smooth surfaces with mean R a < 10 nm. It also produces uniformly wetted surfaces with low contact angles around 20 • . The autoglazed surfaces are less smooth (mean R a around 50 nm) and displays sporadic topographic irregularities. They display larger and less uniform contact angles ranging between 35 • and 50 • . The results suggest that overglazing should be preferred after surface treatment to obtain a smooth and well-wetted dental ceramic surface.

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Section: Introductionmentioning

confidence: 99%

Effect of various treatment and glazing (coating) techniques on the roughness and wettability of ceramic dental restorative surfaces

Aksoy¹,

Polat

et al. 2006

Colloids and Surfaces B: Biointerfaces

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show abstract

“…For bilayer specimens, in ZB groups, the cooling method was not able to affect the flexural strength because zirconia was on the lower surface and it was more directly under tension and might be responsible for the whole sample strength [23][24] . In PB groups, the cooling method affected the flexural strength.…”

Section: Discussionmentioning

confidence: 99%

Strength of 3Y-TZP and feldspathic porcelain subjected to different cooling methods

Almeida-Júnior¹,

Longhini²,

Galvão³

et al. 2014

Braz. J. Oral Sci.

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Aim: To investigate the effect of the cooling rate on flexural strength of monolayer and bilayer porcelain/zirconia (Y-TZP) bars. Methods: Forty-five specimens were made for each design group: (PM) monolithic specimens of veneer porcelain Vita VM9 (Vita, Germany); (ZM) monolithic specimens of zirconia (ZiHP; ProtMat, Brazil); (PB) bilayer specimens zirconia/porcelain with porcelain on lower surface; and (ZB) bilayer specimens porcelain/zirconia with zirconia on lower surface. Each group was cooled by three different methods after porcelain sintering: slowspecimens were cooled inside the turned-off furnace; normal -specimens were removed from the furnace and cooled in air at room temperature; and fast -specimens were removed from the furnace at 910°C and cooled by compressed air for 10 s. Specimens were polished and flexural strength was measured in water at 37 °C (n=15). Maximum load at fracture was recorded, and equations for simple (monolayer) and composite (bilayer) structures were used to calculate the flexural strength. Results were analyzed using one-way ANOVA (p<0.05) and Tukey test separately for each design. Results: The results of one-way ANOVA were statistically significant only for the PB group. The post-hoc Tukey test showed the highest flexural strength for fast cooling and the lowest for slow cooling; the normal cooling was statistically similar to both. Conclusions: Cooling methods affected only the flexural strength of bilayer specimens with porcelain on low surface (under tension) when the slow cooling method was used.

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“…For a core thickness of 1 mm, the core/dentine thickness ratio failed to influence the biaxial flexural strength values 21) . However, for a core thickness of 1.5 mm, when the core/dentin thickness ratio was increased to 2:1, the biaxial flexural strength values increased 22) . Using 1-mm thick bar-shaped zirconia specimens, Lima et al 23) reported that the thickness of the veneer ceramic influences the mechanical strength of the bilayered ceramic system.…”

Section: Introductionmentioning

confidence: 92%

“…Fleming et al 21,22) assessed the effect of the core/ dentine thickness ratio on the biaxial flexural strength. Core thicknesses of 1 mm 21) and 1.5 mm 22) with core/ dentine thickness ratios of 2:1, 1:1, and 1:2 were tested with either the core or the veneer porcelain loaded in tension.…”

Section: Introductionmentioning

confidence: 99%

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The effect of zirconia thickness on the biaxial flexural strength of zirconiaceramic bilayered discs

et al. 2015

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The aim of this study was to assess the effect of zirconia core thickness on the biaxial flexural strength values of zirconia-porcelain bilayered discs. A total of 60 discs with 0.3, 0.4, and 0.5 mm thickness were obtained from a fully sintered zirconia block. A 1.5-mm thick layer of veneer porcelain was fired on the zirconia specimens and biaxial flexural strength tests were performed on the bilayered discs. In each group, the loading surface was the veneer porcelain in half of the specimens (core in tension) and the zirconia core surface in the other half (core in compression). The zirconia core thickness had no effect on the biaxial flexural strength of zirconiaporcelain bilayered discs when the core was in tension (p>0.05). Whereas, when the core was in compression, an increase in the zirconia core thickness resulted in an increase in the biaxial flexural strength (p<0.05).

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The effect of core:dentin thickness ratio on the bi-axial flexure strength and fracture mode and origin of bilayered dental ceramic composites

Cited by 27 publications

References 17 publications

Effect of various treatment and glazing (coating) techniques on the roughness and wettability of ceramic dental restorative surfaces

Effect of various treatment and glazing (coating) techniques on the roughness and wettability of ceramic dental restorative surfaces

Strength of 3Y-TZP and feldspathic porcelain subjected to different cooling methods

The effect of zirconia thickness on the biaxial flexural strength of zirconiaceramic bilayered discs

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