Effects of extreme cooling methods on mechanical properties and shear bond strength of bilayered porcelain/3Y-TZP specimens

Almeida-Júnior, Antonio Alves de; Longhini, Diogo; Domingues, Natália Bertolo; Santos, Claudinei dos; Adabo, Gelson Luís

doi:10.1016/j.jdent.2013.01.005

Cited by 17 publications

(7 citation statements)

References 34 publications

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“…A compatible CTE of veneering ceramic to zirconia results in an appropriated bond strength. All tested groups in this study exhibited the mean bond strength in the range of 19.47-25.85 MPa, except for Z-IdS, which is consistent with other studies ( 14 , 15 , 28 ). The significant highest bond strengths for both Z-CCK and Z-VM9 indicated that a compatible CTE promotes favorable bond strength.…”

Section: Discussionsupporting

confidence: 92%

“…Failures of ceramic veneered zirconia were reported with high incidence of fracture, chipping, and delamination of veneering ceramic from zirconia substructure ( 8 - 11 ). The potential failure causes are associated with an improper substructure design, the presence of critical flaws, and thermal-related interfacial residual stresses ( 12 - 15 ). The residual stress generated is a result of the difference in coefficient of thermal expansion (CTE) between the veneering ceramic and zirconia, which likely induces zirconia phase transformation that affects the bond strength ( 16 - 19 ).…”

Section: Introductionmentioning

confidence: 99%

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Role of coefficient of thermal expansion on bond strength of ceramic veneered yttrium-stabilized zirconia

Juntavee¹,

Dangsuwan²

2018

J Clin Exp Dent

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BackgroundIncompatible coefficient of thermal expansion (CTE) is supposed to be a reason for chipping of ceramic veneered zirconia. This study evaluates the effect of veneering ceramic at varied CTE on bond strength to zirconia.Material and MethodsZirconia disks (Z, Ø 10 mm, 1.0 mm thickness) were prepared from Y-TZP (Cercon®) and sintered at 1350°C for 6 hours. All zirconia disks were veneered with ceramics ((Ø 7.0 mm, 1.5 mm thickness) with varied CTE including VITADur® alpha (VDα), VITAVM®7 (VM7), VITAVM®9 (VM9), Cercon® ceramkiss (CCK), IPSe.max® ceram (IeC), and IPS dSIGN® (IdS) (n=15). The specimens were thermo-cycled (5-55 °C, 500 cycles) prior to determine the shear bond strength on a universal testing machine. The veneering ceramic and zirconia rods (Ø 4 mm, 30 mm length) were prepared for CTE evaluation. ANOVA and Tukey’s multiple comparisons were used to determine the statistically significant difference (α=0.05). Weibull analysis was applied for survival probability, Weibull modulus (m), and characteristics strength (σo) of the shear bond. The interfaces were microscopically examined. The phase transformation of zirconia was determined using X ray diffraction.Results The mean±sd (MPa), m, and σo of bond strength were 20.45±2.32, 9.25, and 21.53 for Z-VDα, 19.47±4.53, 4.66, and 20.31 for Z-VM7, 21.05±3.96, 5.61, and 21.88 for Z-IeC, 25.85±2.74, 9.93, and 27.15 for Z-VM9, 25.82±4.39, 6.27, and 27.06 for Z-CCK, and 2.96±0.73, 4.11, and 3.28 for Z-IdS. The CTE (×10-6/°C) were 10.80, 7.83, 7.87, 9.86, 9.93, 10.03, and 12.95 for Z, VDα, VM7, IeC, VM9, CCK, and IdS. The bond strength was significantly affected by the CTE difference (p<0.05). The t→m phase transformation related with the CTE difference.ConclusionsThe CTE’s differences induced stress that affected the bond strength. CTE’s compatibility of veneering ceramic to zirconia is crucial for enhancing the bond strength. The CTE difference approximately 0.77-0.87×10-6/°C was recommended. Key words:Bond strength, coefficient of thermal expansion, zirconia.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Role of coefficient of thermal expansion on bond strength of ceramic veneered yttrium-stabilized zirconia

Juntavee¹,

Dangsuwan²

2018

J Clin Exp Dent

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“…S-cooling aimed to minimize the thermal gradient by consistent cooling of ceramic both at the inner and outer surface below the Tg to prevent excessive occurrence of transient stresses (14,24,28). Furthermore, some studies found better outcomes for F-cooling (22,23). It was suggested that stress developed upon F-cooling could improve fracture resistance of the ceramic surface, but might generate immense tensile stress at the interfacial zone.…”

Section: Discussionmentioning

confidence: 99%

“…The slow cooling may reduce the thermal gradient, producing appropriate residual stress, since it increases time for plastic flow state (22). Other studies reported better flexural and bond strength for ceramic-veneered zirconia upon fast cooling (22,23).…”

Section: Introductionmentioning

confidence: 89%

Influence of different veneering techniques and thermal tempering on flexural strength of ceramic veneered yttria partially stabilized tetragonal zirconia polycrystalline restoration

Juntavee

Serirojanakul

2019

J Clin Exp Dent

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Background Different technique for ceramic veneering and thermal tempering process are expected to be a reason for alteration in strength of ceramic veneered zirconia. This study evaluates the effect of different veneering technique and varied thermal tempering process on flexural strength of ceramic veneered zirconia. Material and Methods Ceramic veneered zirconia bars (25 mm length, 4 mm width, 0.7&1.0mm of zirconia & ceramic thickness) were prepared from zirconia block (e.max® ZirCAD), sintered at 1500°C for 4 hours, and veneered with ceramics with different techniques including CAD-fused using e.max CAD® (C), Pressed-on using e.max® Zirpress (P), and layering using e.max® ceram (L), with different tempering process through fast (F), medium (M), and slow (L) cooling (n=15). The specimens were determined for flexural strength on a universal testing machine. ANOVA and Bonferroni’s multiple comparisons were used to determine for significant difference (α=0.05). Weibull analysis was applied for survival probability, Weibull modulus (m), and characteristics strength (σc). The interfaces were microscopically examined. The phase transformation of zirconia was determined using X ray diffraction. Results The mean±sd (MPa), m, σc of flexural strength were 922.06±83.45, 12.78, 958.32 for CF, 924.26±74.64, 14.28, 959.62 for CM, 930.25±92.42, 11.83, 970.83 for CS, 518.29±59.97, 10.11, 542.97 for PF, 516.50±67.51, 8.75, 539.17 for PM, and 520.51±42.38, 14.59, 544.51 for PS, 604.36±64.09, 11.28, 630.67 for LF, 583.81±56.95, 11.67, 609.81 for LM, 547.33±52.23, 12.19, 569.36 for LS. The flexural strength was significantly affected by veneering technique ( p <0.05). No significant effect on flexural strength upon tempering process was evidenced ( P >0.05). Phase transformation from t→m related with veneering and tempering procedure. Conclusions Strength of ceramic veneered zirconia associated with different veneering techniques, but not directly related with tempering process. CAD-on ceramic veneering zirconia is benefit for enhancing the strength of ceramic bilayer and was recommended as a method for ceramic veneering zirconia. Key words: CAD-CAM, cooling process, flexural strength, thermal tempering, zirconia.

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“…The reason due to the differences in the composition and microstructure of two types of veneering porcelain might affect the surface texture and bond strength between the ceramics and resin. Vita VMK95 contain in its composition more silica (about 68%) (36) than Vita VM9 (about 60%) (37) which dissolved by HF acid leaving more rough surface where HF acid react selectively with silica creating a micro retentive surface which facilitates the interlocking of the resin composite (38) .…”

Section: Hydroflouric Acid Etching For Porcelain Groups (Vpm Group Anmentioning

confidence: 99%

Shear Bond Strength of Composite Repair Material to Ceramo-metallic and zirconium Restorations Using A New Adhesive System

Maarof

Elgabarouny

Shebl

et al. 2020

Dental Science Updates

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Introduction:Clinical success of ceramic repair system is dependent on integrity of bond between metal, ceramic and resin composite. Aim: Evaluate shear bond strength (SBS) of composite repair material to ceramo-metalic and zirconium restorations using new adhesive system after thermocycling. Materials and methods: 28 square specimens of metal, zirconia, veneering porcelain for metal (VMK95) and veneering porcelain for zirconia (VM9) were prepared (1 x 1 x 0.5 cm) and divided into 4 groups: 1)metal (M) group , 2)zirconia (Z) group , 3)veneering porcelain for metal (VPM) group, 4)veneering porcelain for zirconia(VPZ) group). Then M and Z groups were sandblasted while VPM and VPZ groups were subjected to HF acid. Single bond universal adhesive were applied to exposed surface of all groups then repair composite material was built up incrementally over center of exposed surface using cylindrical teflon mold (3 x 5 mm), stored for 7 days in distilled water followed by 1000 thermocycles then SBS was tested. Results: Highest SBS value between composite repair material and M group followed by Z group and composite repair material then VPM group and composite repair material then VPZ group and composite repair material. Conclusions: Sandblasting and application of single bond universal adhesive containing MDP can be recommended for repair metal and zirconium surfaces with composite material. HF acid etching and application of single bond universal adhesive containing MDP can be recommended for repair VPM and VPZ with composite repair material.

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Effects of extreme cooling methods on mechanical properties and shear bond strength of bilayered porcelain/3Y-TZP specimens

Abstract: Slow cooling seems to affect the veneer resistance and adhesion to the zirconia core; however, the reliability of fast cooling was slightly lower than that of the other methods.

Cited by 17 publications

References 34 publications

Role of coefficient of thermal expansion on bond strength of ceramic veneered yttrium-stabilized zirconia

Role of coefficient of thermal expansion on bond strength of ceramic veneered yttrium-stabilized zirconia

Influence of different veneering techniques and thermal tempering on flexural strength of ceramic veneered yttria partially stabilized tetragonal zirconia polycrystalline restoration

Shear Bond Strength of Composite Repair Material to Ceramo-metallic and zirconium Restorations Using A New Adhesive System

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