Influence of Different Sintering Protocols on Translucency and Fracture Resistance of Monolithic Zirconia Crowns

Asaad, Rasha Sayed; Aboushahba, Mostafa

doi:10.21608/edj.2020.42653.1257

Cited by 7 publications

(7 citation statements)

References 25 publications

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“…Researchers stated that larger grain sizes were observed in classic sintering compared to speed and/or superspeed sintering. 29 38 Superspeed sintered 5Y-TZP 29 or 3Y-TZP 38 reportedly exhibited smaller average grain sizes than classic- and speed-sintered samples. Researchers who only examined the effect of different sintering temperatures observed that the grain size of zirconia (3Y-TZP, 4Y-TZP, and 5Y-TZP) increased as the sintering temperature increased.…”

Section: Discussionmentioning

confidence: 93%

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Effect of sintering programs and surface treatments on monolithic zirconia

Dokuzlu,

Subaşı

2024

J Adv Prosthodont

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PURPOSE To investigate the effect of sintering programs and surface treatments on surface properties, phase transformation and flexural strength of monolithic zirconia. MATERIALS AND METHODS Zirconia specimens were sintered using three distinct sintering programs [classic (C), speed (S), and superspeed (SS)] (n = 56, each). One sample from each group underwent scanning electron microscopy (SEM) and grain size analysis following sintering. Remaining samples were divided into five subgroups (n = 11) based on the surface treatments: control (CL), polish (P), glaze (G), grind + polish (GP), and grind + glaze (GG). One sample from each subgroup underwent SEM analysis. Remaining samples were thermally aged. Monoclinic phase volume, surface roughness, and three-point flexural strength were measured. Monoclinic phase volume and surface roughness were analyzed by Kruskal-Wallis and Dunn tests. Flexural strength was analyzed by two-way ANOVA and Weibull analysis. The relationships among the groups were analyzed using Spearman’s correlation analysis. RESULTS Sintering program, surface treatment, and sintering × surface treatment ( P ≤ .010) affected the monoclinic phase volume, whereas the type of surface treatment and sintering × surface treatment affected the surface roughness ( P < .001). Type of sintering program or surface treatment did not affect the flexural strength. Weibull analysis revealed no significant differences between the m and σ o values. Monoclinic phase volume was positively correlated with surface roughness in the SGG and SSP groups. CONCLUSION After sintering monolithic zirconia in each of the three sintering programs, each of the surface treatments can be used. However, for surface quality and aging resistance, G or GG can be recommended as a surface finishing method.

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Section: Discussionmentioning

confidence: 93%

“…The effects of both sintering temperature and time 29 38 and only sintering temperature 39 40 on the grain size of zirconia ceramics (3Y-TZP) were investigated. Researchers stated that larger grain sizes were observed in classic sintering compared to speed and/or superspeed sintering.…”

Section: Discussionmentioning

confidence: 99%

Effect of sintering programs and surface treatments on monolithic zirconia

Dokuzlu,

Subaşı

2024

J Adv Prosthodont

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“…Monolithic zirconia restorations have become greatly popular among dentists as it is associated with decreased amount of tooth reduction and thickness of restorative material when compared to veneered zirconia restoration as well as minimal wear of opposing enamel in contact to polished monolithic zirconia (10) .…”

Section: Discussionmentioning

confidence: 99%

“…Esthetic ceramic prostheses should match both color and translucency of natural teeth as these factors are the most determining factors that influences esthetic properties of ceramic restorations (10) .…”

Section: Discussionmentioning

confidence: 99%

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Optical Properties of Zirconia Monolithic Crowns Constructed Using Speed Sintering Cycle

2022

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Purpose: This study examined the effect of change in sintering time on the optical properties of monolithic zirconia crowns using ZirCAD Prime. Materials and methods: A Sound premolar was scanned using optical oral scanner. The scanned premolar was digitally prepared to receive zirconia restoration using Exocad software following standard preparation guidelines for ceramic restorations. 3D printed resin master die was produced. An impression was made for the 3D printed master die using polyvinylsiloxane impression material then poured using epoxy resin. The procedure was repeated to obtain 16 epoxy resin models. Sixteen crowns were produced by CAD-CAM system from ZirCAD Prime blank shade A2 with 16 mm thickness. Samples were divided into two groups according to sintering time (n=8). Group (A): crowns were sintered using normal sintering cycle for 9h and 50 min. Group (B): crowns were sintered using speed sintering cycle for 2h and 26 min. After sintering the internal surfaces of both groups were abraded with 50 μm Al 2 O 3 particles. Optical properties including Translucency Parameter (TP) and change in color (ΔE) of samples were determined using spectrophotometer. Obtained values were statistically analyzed. Results: Regarding change of color evaluation mean ∆E values were below 3.0 which is considered "clinically imperceptible". There was also no significant difference in translucency parameter between both groups. Conclusion: ZirCAD Prime speed sintering cycle will have no perceived effect on color and translucency of the final restoration.

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