A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

Belli, Renan; Hurle, Katrin; Schürrlein, Jana; Petschelt, Anselm; Werbach, Katharina; Peterlik, Herwig; Rabe, Torsten; Mieller, Björn; Lohbauer, Ulrich

doi:10.26434/chemrxiv.14044205.v1

Cited by 6 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zirconia material is outstandingly large in both flexural strength and hardness, as compared with other restorative materials. In addition, the fracture toughness values of 5Y decrease by about 50% from that of 3Y with the cubic phase content due to the increasing of yttria content (Figure 13) [33]. Fracture toughness largely depends on the stress-induced phase transformation as mentioned above and decreases with the content of cubic phase that do not generate this transformation.…”

Section: Hardness Flexural Strength and Fracture Toughnessmentioning

confidence: 85%

Classification and Properties of Dental Zirconia as Implant Fixtures and Superstructures

Ban

2021

Materials

View full text Add to dashboard Cite

Various types of zirconia are widely used for the fabrication of dental implant superstructures and fixtures. Zirconia–alumina composites, such as ATZ and NanoZR, are adequate for implant fixtures because they have excellent mechanical strength in spite of insufficient esthetic properties. On the other hand, yttria-stabilized zirconia has been used for implant superstructures because of sufficient esthetic properties. They are classified to 12 types with yttria content, monochromatic/polychromatic, uniform/hybrid composition, and monolayer/multilayer. Zirconia with a higher yttria content has higher translucency and lower mechanical strength. Fracture strength of superstructures strongly depends on the strength on the occlusal contact region. It suggests that adequate zirconia should be selected as the superstructure crown, depending on whether strength or esthetics is prioritized. Low temperature degradation of zirconia decreases with yttria content, but even 3Y zirconia has a sufficient durability in oral condition. Although zirconia is the hardest dental materials, zirconia restorative rarely subjects the antagonist teeth to occlusal wear when it is mirror polished. Furthermore, zirconia has less bacterial adhesion and better soft tissue adhesion when it is mirror polished. This indicates that zirconia has advantageous for implant superstructures. As implant fixtures, zirconia is required for surface modification to obtain osseointegration to bone. Various surface treatments, such as roughening, surface activation, and coating, has been developed and improved. It is concluded that an adequately selected zirconia is a suitable material as implant superstructures and fixtures because of mechanically, esthetically, and biologically excellent properties.

show abstract

Section: Hardness Flexural Strength and Fracture Toughnessmentioning

confidence: 85%

Classification and Properties of Dental Zirconia as Implant Fixtures and Superstructures

Ban

2021

Materials

View full text Add to dashboard Cite

show abstract

“…From a crystallographic viewpoint, the observed change in crystal phase composition upon the addition of Ga 2 O 3 is thought to have a negative effect on flexural strength. The high flexural strength and fracture toughness of yttria partially stabilized zirconia polycrystals are attributed to tetragonal→monoclinic stress-induced phase transformation; accordingly, the higher the content of low yttrium tetragonal phase with high tetragonality (i.e., the phase at the origin of stress-induced phase transformation), the higher flexural strength and fracture toughness [ 23 ]. XRD results showed that the addition of Ga 2 O 3 decreased the tetragonality and the content of the low yttrium tetragonal phase.…”

Section: Resultsmentioning

confidence: 99%

“…Rietveld refinement was carried out from the obtained diffraction pattern using a Rietan-FP [ 22 ]. Two tetragonal phases with different yttria concentrations were used as the initial structural model for the Rietveld refinement ( Table 4 ) as described in a previous report [ 23 ].…”

Section: Methodsmentioning

confidence: 99%

Effect of Ga2O3 Dopant on High Speed Sintered 5 mol% Y2O3 Stabilized Dental Zirconia

2023

View full text Add to dashboard Cite

The high-speed sintering of zirconia has become essential for ceramic dental prosthesis treatment in a single visit. Previous studies have shown that 5 mol% yttria-stabilized zirconia (5Y zirconia), with the exception of some types, loses strength and translucency with high-speed sintering. In this study, 0.15–0.92 wt% Ga2O3, which is expected to promote the sintering of zirconia, was added to improve the properties of 5Y zirconia high-speed sintered bodies, and the effect of its addition was evaluated. The specimens were characterized by density and translucency measurements, a three-point bending test, X-ray diffraction (XRD), scanning electron microscopy (SEM), and shrinkage measurement. The addition of Ga2O3 improved both translucency and flexural strength of 5Y zirconia high-speed sintered bodies. XRD and SEM observations revealed that this improvement in properties was due to the change in the crystal phase composition and the decrease in the amount and size of pores due to the addition of Ga2O3. Shrinkage measurements also revealed that the addition of Ga2O3 changed the sintering behavior of 5Y zirconia, suggesting that this change led to a reduction in porosity. From the above results, it was concluded that Ga2O3 addition is effective in improving the properties of 5Y zirconia high-speed sintered bodies.

show abstract

“…7). This intermediate phase (t″ phase) is a yttriumrich tetragonal phase, which is present in 5Y zirconia but does not contribute to strength enhancement because it does not undergo a stress-induced phase transition to monoclinic phase 15,16) . In other words, the cubic crystal has improved translucency because it has grown into larger grains.…”

Section: Microstructure and Firing Conditions Of Uhtzmentioning

confidence: 99%

Development and characterization of ultra-high translucent zirconia using new manufacturing technology

Ban

2023

Dent. Mater. J.

View full text Add to dashboard Cite

This review describes the development of ultra-high translucent zirconia (referred to as UHTZ) using new manufacturing technology and its characterization results. The development of UHTZ was primarily due to the adoption of two basic manufacturing technologies, "Cyclic CIP" and "Plus Y Technology". This manufacturing technology could provide stable processing characteristics, which improves chipping resistance during milling. Furthermore, the enlargement factor (processing coefficient) for UHTZ is smaller than those for conventional products. In general, the higher the light transmittance, the lower the flexural strength. Despite its extremely high translucency, the most significant feature of UTHZ is that its flexural strength is comparable to that of 5Y. Furthermore, UHTZ has higher chemical durability and uniform microstructure, which results in less wear on the opposing teeth and superior discoloration resistance. Therefore, UHTZ is a new option for inlay, onlay, and laminate veneer applications, where lithium disilicate glass ceramics has been widely used.

show abstract

A Revised Relationship Between Fracture Toughness and Y2O3 Content in Modern Dental Zirconias

Cited by 6 publications

References 0 publications

Classification and Properties of Dental Zirconia as Implant Fixtures and Superstructures

Classification and Properties of Dental Zirconia as Implant Fixtures and Superstructures

Effect of Ga2O3 Dopant on High Speed Sintered 5 mol% Y2O3 Stabilized Dental Zirconia

Development and characterization of ultra-high translucent zirconia using new manufacturing technology

Contact Info

Product

Resources

About