Influence of cooling rate on zirconia/veneer interfacial adhesion

Göstemeyer, Gerd; Jendras, Michael; Dittmer, Marc; Bach, Friedrich‐Wilhelm; Stiesch, Meike; Kohorst, Philipp

doi:10.1016/j.actbio.2010.06.026

Cited by 105 publications

(106 citation statements)

References 27 publications

(55 reference statements)

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“…Furthermore, controlled cooling rates might enhance the bond strength of veneering porcelain to the metal framework (10,12). An in vitro study (13) of the influence of cooling rate on the bond strength between a zirconia core material and veneering porcelain indicated that bond strength was reduced by slow cooling. However, there are few data on the effect of cooling rates on the bond strength of veneering porcelain to zirconia material.…”

Section: Introductionmentioning

confidence: 99%

Effect of cooling rate on shear bond strength of veneering porcelain to a zirconia ceramic material

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Effect of cooling rate on shear bond strength of veneering porcelain to a zirconia ceramic material

et al. 2010

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“…It is known that residual stresses can occur due to a thermal mismatch between the zirconia core and the porcelain veneer, or due to an inadequate cooling rate after the last firing of the porcelain veneer applied on zirconia 11,12,17,23 . However, considering solely porcelain, stresses may also be generated due to a non-uniform solidification resultant from thermal gradients from the surface to the center of the porcelain 7,12 , once the ceramic materials have low thermal diffusivity and low thermal conductivity. Tensile stress generated during Fracture toughness (K Ic ) was calculated based on the four-point flexural test results, using equation 3:…”

Section: Resultsmentioning

confidence: 99%

“…Because of the high stiffness of ceramics materials, residual stresses are produced and it can increase the probability of porcelain veneer chipping during mastication 18,19 . Moreover, considering that zirconia-based substructures have lower thermal diffusivity and thermal conductivity if compared to metallic substructures for metal-ceramic restorations, several firing cycles with different cooling methods have been proposed, which vary antagonistically since slow cooling 7,11,14,20,21 to fast cooling 6,9,10,12,[20][21][22][23] . However, there is no consensus about an ideal firing cycle.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, the cooling method did not influence the flexural strength results, which points out the role of the thermal proprieties of the framework in a bilayer complex. In a bilayer porcelain/zirconia, the compressive/ tempering stresses in the porcelain layer under fast cooling can improve the resistance of the surface layer 7 and develop high residual tension at the zirconia/porcelain interface 6,9 . Thus, this phenomenon has great importance to bilayers.…”

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confidence: 99%

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Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

et al. 2017

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To solve chipping of veneer porcelain in zirconia dental prosthesis it has been studied different cooling rates in firing schedules to control residual stresses generated by differences in thermal properties between the ceramics. However, cooling rates may affect the porcelain, irrespectively of interaction with zirconia. This study analyzed the effect of cooling rate on the three-point flexural strength (FS), residual stress, Vickers hardness (VH) and V-notch fracture toughness (SEVNB) on a feldspathic porcelain (Vita VM9) indicated for covering zirconia. Bar-shaped specimens were sintered according manufacturer's schedule firing and cooled at different rates (slow, normal or fast). Specimens were tested for FS (n=30), VH (n=15) and SEVNB tests (n=15). Weibull analysis were performed from FS values to measure reliability and probability of failure (PF). One-way ANOVA was significant for VH (p<0.001), and Tukey's test showed that slow cooling led to higher values. There was no significant difference for FS (p=0.654) and SEVNB (p=0.734). Fast cooling led to the lowest PF, but cooling rate factor was not significant for Weibull modulus. All cooling group showed residual tensile stress (MPa): Slow = 34.81; Normal = 27.04; Fast = 18,98. It was concluded that cooling rate produce minor changes in the porcelain properties.

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“…Therefore, veneering materials for allceramic system should have high mechanical strength 16 . Different cooling rates after porcelain firing schedule have been proposed for reducing those residual stresses 10,[17][18] . The study of flexural strength of veneering porcelains and zirconia using faster or slower cooling is an important parameter to improve the clinical behavior and performance of veneered zirconia prostheses.…”

Section: Introductionmentioning

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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Influence of cooling rate on zirconia/veneer interfacial adhesion

Cited by 105 publications

References 27 publications

Effect of cooling rate on shear bond strength of veneering porcelain to a zirconia ceramic material

Effect of cooling rate on shear bond strength of veneering porcelain to a zirconia ceramic material

Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis

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

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