Effect of high-speed sintering on the flexural strength of hydrothermal and thermo-mechanically aged zirconia materials

Jerman, Eva; Mayinger, Felicitas; Eichberger, Marlis; Reichert, Axel; Stawarczyk, Bogna

doi:10.1016/j.dental.2020.05.013

Cited by 36 publications

(34 citation statements)

References 25 publications

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“…6 From a clinical point of view, conventional sintering times for zirconia are time wasting process that may extend to 4 to 12 hours involving slow heating and cooling rates with increased dwell time. 7,8 This, in turn, extended the treatment times with multiple treatment appointments. 8 Currently, the chairside dentistry is gaining more attention due to decreased time and cost with high productivity and increased patient comfort.…”

Section: Introductionmentioning

confidence: 98%

“…7,8 This, in turn, extended the treatment times with multiple treatment appointments. 8 Currently, the chairside dentistry is gaining more attention due to decreased time and cost with high productivity and increased patient comfort. This results in introduction of speed sintering protocol that could be achieved at temperature range 1500 to 1600 °C and dwell time of 30 minutes.…”

Section: Introductionmentioning

confidence: 98%

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Infuence of Speed Sintering Protocol on Fracture Resistance of Translucent Fixed Restorations .

2020

Mansoura Journal of Dentistry

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Objectives: The aim of this in vitro study was to investigate the influence of speed sintering protocol on the fracture resistance of the translucent zirconia. Materials and Methods:Forty intact maxillary premolars were used in this study. All teeth were divided according to the type of zirconia into two main groups (n=20): Group K receiving KATANA HTML zirconia and Group Z receiving Zolid fx ML zirconia, Then, each group subdivided according to sintering protocol into two subgroups (n=10): KC and KS refer to KATANA HTML sintered by conventional and speed sintering protocols, respectively, while ZC and ZS refer to Zolid fx ML sintered by conventional and speed sintering protocols, respectively. The teeth were prepared by the aid of dental surveyor. After cementation with self-adhesive resin, the specimens were subjected to thermal cycling for 5000 cycles and mechanically loaded for 120,000 cycles.Then, the specimens were loaded to fracture. Mode of failure was assisted using stereoscopy and scanning electron microscope micrographs. Results: The highest mean value of fracture resistance was recorded in KC subgroup (3083.79 ±844.88) followed byKS subgroup (2864.41 ±692.15)vs ZC (2342.85 ±434.04) and ZS (1829.18 ±299.38) subgroups. Two-way ANOVA showed no interactions between variables (P=.448). Conclusions:Increasing the yttria content had negative impact on zirconia fracture resistance. Although, the sintering protocols did not influence the fracture resistance of the tested zirconia, Zolid fx ML was affected by the speed sintering protocol. Despite of the present results, the tested zirconia can be used safely at premolar area.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Infuence of Speed Sintering Protocol on Fracture Resistance of Translucent Fixed Restorations .

2020

Mansoura Journal of Dentistry

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“…Sintering causes a volume reduction, a decrease in roughness and pore volume (ref. [ 24 , 25 , 26 ]), and the transformation from the monoclinic to the tetragonal phase [ 27 ]. In order to achieve a complete phase transformation and, at the same time, minimize restraint stresses in the cross-section of the restoration, the heating and cooling rate [ 28 ] as well as the holding time during the re-sintering process have to be controlled.…”

Section: Introductionmentioning

confidence: 99%

Influence of Manufacturing Regimes on the Phase Transformation of Dental Zirconia

et al. 2021

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Background: The influence of typical manufacturing regimes for producing fixed dental prostheses (FDPs) from yttria partly-stabilized zirconia polycrystals (3Y/4Y/5Y-TZP) on the phase composition is quantified. Methods: Fixed dental prostheses (FDPs) were designed using a CAD process and machined from different Y-TZP blanks from two manufacturers differing in yttria contents. Subsequent to sintering, the FDPs were glaze fired and air-blasted using alumina particles. Phase composition was determined with X-ray diffraction and quantified with Rietveld refinement. Results: The blanks from VITA Zahnfabrik (VITA YZ HT, VITA YZ ST, VITA YZ XT) and Dental Direct (DD Bio ZX2, DD cube ONE, DD cube X2) featured a rhombohedral portion with rather small crystallites and a small monoclinic portion for 3Y/4Y-TZPs, which increased after machining and disappeared after sintering. Glaze firing and air-blasting with alumina particles had no significant influence on the phase composition. Conclusion: The phase history of dental zirconia is revealed, which may have implications on further processing and aging of the FDP (e.g., low temperature degradation) in mouth.

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“…As an alternative to the conventional sintering protocol, high-speed sintering for dental zirconia with high temperature in the range of 1570–1590 °C was introduced; this may affect the mechanical properties by increasing the grain size [ 4 , 5 ]. Studies have shown contradictory findings regarding the effect of speed sintering on the mechanical properties, either increasing or decreasing the flexural strength of sintered zirconia [ 6 , 7 , 8 , 9 ]. Speed sintering was reported to have a variable influence on the strength, depending on the content of yttria [ 4 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown contradictory findings regarding the effect of speed sintering on the mechanical properties, either increasing or decreasing the flexural strength of sintered zirconia [ 6 , 7 , 8 , 9 ]. Speed sintering was reported to have a variable influence on the strength, depending on the content of yttria [ 4 , 7 ]. The optical properties of sintered zirconia may also be affected by speed sintering due to an increase in the grain size [ 4 , 6 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Clinical Feasibility of Fully Sintered (Y, Nb)-TZP for CAD-CAM Single-Unit Restoration: A Pilot Study

et al. 2021

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Fifteen participants (9 male, 6 female) received a total of 15 monolithic single restorations made from fully sintered (Y, Nb)-TZP (tetragonal zirconia polycrystal) block. The restorations were clinically evaluated for survival, success rate, and periodontal probing depths 6 months after the insertion of the restorations. Esthetic, functional, and biological evaluations were also performed over a 6-month follow-up period. The survival and success rates of the single-unit restorations were 100%. The periodontal probing depth values ranged from 1 to 3 mm. No complications with regard to functional and biological properties were observed after 6 months. The postoperative sensitivity was only a transient phenomenon. The fully sintered (Y, Nb)-TZP single-unit restoration showed highly acceptable quality with successful clinical performance over 6 months.

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Effect of high-speed sintering on the flexural strength of hydrothermal and thermo-mechanically aged zirconia materials

Cited by 36 publications

References 25 publications

Infuence of Speed Sintering Protocol on Fracture Resistance of Translucent Fixed Restorations .

Infuence of Speed Sintering Protocol on Fracture Resistance of Translucent Fixed Restorations .

Influence of Manufacturing Regimes on the Phase Transformation of Dental Zirconia

Clinical Feasibility of Fully Sintered (Y, Nb)-TZP for CAD-CAM Single-Unit Restoration: A Pilot Study

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