Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing

Sundh, Anders; Molin, Margareta; Sjögren, Göran

doi:10.1016/j.dental.2004.07.013

Cited by 243 publications

(265 citation statements)

References 18 publications

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“…5,7 The distance between the centers of the dies was 16 mm, corresponding to the distance between a lower second premolar and a lower second molar (10 mm span). An artificial gingiva was produced with acrylic resin (JET, Clássico, São Paulo, Brazil), and a polyvinyl siloxane impression of the model was taken (Aquasil TM , Dentsply, Petrópolis, Brazil) using the double impression technique.…”

Section: Methodsmentioning

confidence: 99%

“…In such cases, the CAD-CAM system should produce larger restorations to compensate the sintering shrinkage, and to ensure adequate fit of the crown. [3][4][5] The literature reports mean failure load values between 981 and 3480 N for three-unit Y-TZP FPDs, [6][7][8][9] and values ranging from 706 to 1262 N for four-unit Y-TZP FPDs. 10,11 In addition, clinical studies have showed low failure rates for Y-TZP restorations, i.e., about 2% to 6% after three to five years.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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The objective of the study was to measure the marginal and internal fit of zirconia-based all-ceramic three-unit fixed partial dentures (FPDs) (Y-TZP -LAVA, 3M-ESPE), using a novel methodology based on micro-computed tomography (micro-CT) technology. Stainless steel models of prepared abutments were fabricated to design FPDs. Ten frameworks were produced with 9 mm² connector cross-sections using a LAVA TM CAD-CAM system. All FPDs were veneered with a compatible porcelain. Each FPD was seated on the original model and scanned using micro-CT. Files were processed using NRecon and CTAn software. Adobe Photoshop and Image J software were used to analyze the crosssectional images. Five measuring points were selected, as follows: MG -marginal gap; CA -chamfer area; AW -axial wall; AOT -axio-occlusal transition area; OA -occlusal area. Results were statistically analyzed by Kruskall-Wallis and Tukey's post hoc test (α = 0.05). There were significant differences for the gap width between the measurement points evaluated. MG showed the smallest median gap width (42 µm). OA had the highest median gap dimension (125 µm), followed by the AOT point (105 µm). CA and AW gap width values were statistically similar, 66 and 65 µm respectively. Thus, it was possible to conclude that different levels of adaptation were observed within the FPD, at the different measuring points. In addition, the micro-CT technology seems to be a reliable tool to evaluate the fit of dental restorations.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

et al. 2013

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“…Así, Sundh & cols. demostraron que el recubrimiento cerámico disminuía notablemente la tenacidad de la circonia, justo al contrario de lo que ocurre en los cerámi-cas feldespáticas y aluminosas 7 . Cuanto más frágil es el núcleo, mayor es el refuerzo que ejerce la porcelana de recubrimiento.…”

Section: Resistencia a La Fracturaunclassified

Cerámicas dentales: clasificación y criterios de selección

Rus

Ramiro

García³

et al. 2007

RCOE

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Resumen : Hoy en día, hablar de restauraciones estéticas implica hablar de cerámica sin metal. Han sido tan importantes y revolucionarios los cambios y aportaciones en este campo en los últimos años que en la actualidad existen multitud de sistemas cerámicos. Todos ellos buscan el equilibrio entre los factores estéticos, biológicos, mecánicos y funcionales. Sin embargo, existen diferencias considerables entre ellos. Por lo tanto, para seleccionar la cerámica más adecuada en cada caso, es necesario conocer las principales características de estos materiales y de sus técnicas de confección. Esta elección no debe ser delegada al técnico de laboratorio, sino que debe ser responsabilidad del odontoestomatólogo porque él es quien conoce y controla las variables que condicionan el éxito de la restauración a largo plazo. En este artículo, se revisan los principales sistemas cerámicos disponibles actualmente y se analiza su comportamiento clínico. Por último, se exponen unas pautas para orientar al profesional en la toma de decisiónes.Palabras clave: Cerámica, Composición química, Técnica de confección, Resistencia a la fractura, Ajuste marginal, Estética, Supervivencia clínica. Abstract:At the present time, to speak about aesthetic restorations implies speaking about alloy free ceramics. This field has experienced important changes and revolutionary contributions. This has led to the introduction of a multitude of all-ceramic systems. All of these quest for a balance between the aesthetic, biological, mechanical and functional factors. However, considerable differences exist among them. Therefore, to select the most suitable ceramic in every case, it is necessary to know the main features of these materials and the laboratory procedures. Porcelain selection should not be left up to the laboratory technician. Material selection should be the responsibility of the clinician because he knows and controls the variables that determine the long-term success of the restoration. This article reviews the all-ceramic systems now available and its clinical performance. Lastly, decision making guidelines for the clinician are detailed.

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“…Chevalier et al [11] found that heat treatment of the zirconia at 1200°C releases residual stresses without affecting the surface relief. In recent studies it has been found that the heat treatment by the veneering process lowers the strength of zirconia, which has been milled and ground in the sintered form [12,13]. When grinding sintered zirconia, the milling and grinding caused a phase change from tetragonal to monoclinic on the surface of the zirconia.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

Hjerppe

Fröberg

Lassila

et al. 2010

Silicon

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Purpose In dental practice, zirconia substructures for crowns and fixed partial dentures are veneered with feldspathic porcelain for better aesthetical properties. The purpose of this study was to evaluate the effect of heat treatment during the veneering process on the mechanical properties of zirconia. Methods 105 zirconia (ICE Zirkon, Zirkonzahn, Italy) disc shaped specimens were divided into seven groups (n=15/ group) and sintered at 1500°C. Control specimens (group 1) were left as such. Specimens in the study groups were: 2) one heat treatment in a porcelain firing furnace; 3) a heat treatment with two firing cycles; 4) one heat treatment with a thin coating of feldspathic glazing on the tension side; 5) two heat treatments with a thin coating of feldspathic wash and glazing on the tension side; 6) one heat treatment with a thin coating of feldspathic glazing on the compression side; 7) two heat treatments with a thin coating of feldspathic wash and glazing on the compression side. Biaxial flexural strength and surface microhardness of the specimens (diameter 19 mm, thickness 1.2 mm) were measured. The effect of heat treatment and feldspathic glazing on the phase transformations of zirconia was determined by XRD-analysis. The data were calculated using ANOVA-analysis.Results Repeated heat treatment did not influence the mechanical properties of zirconia (p>0.05). No difference (p>0.05) was found in terms of the surface microhardness between the groups. Some transformation from the tetragonal to the monoclinic phase was seen on the surface of the specimens after heat treatment and feldspathic glazing coating. Conclusions Repeated heat treatment does not affect the strength of zirconia milled in the green-stage form.

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Fracture resistance of yttrium oxide partially-stabilized zirconia all-ceramic bridges after veneering and mechanical fatigue testing

Cited by 243 publications

References 18 publications

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

Cerámicas dentales: clasificación y criterios de selección

The Effect of Heat Treatment and Feldspathic Glazing on Some Mechanical Properties of Zirconia

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