Biaxial flexural strength and phase transformation characteristics of dental monolithic zirconia ceramics with different sintering durations: An in vitro study

Durkan, Rukiye; Gökay, Gonca Deste; Şimşek, Hatice; Yılmaz, Burak

doi:10.1016/j.prosdent.2021.04.003

Cited by 5 publications

(9 citation statements)

References 32 publications

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“…Similar to the findings of previous studies, 41 42 the flexural strength values were not affected by the sintering temperature or duration in this study. The difference between the flexural strength observed in this study and those observed in other studies 27 28 29 30 may be due to the differences in the formulation of the ceramic materials, sintering parameters, and flexural strength test type. In this study, since the sintering programs used were those recommended by the manufacturer 32 and no significant correlation was observed between flexural strength and monoclinic phase volume data, the flexural strength values of the zirconia remained unaffected by the sintering temperature and time.…”

Section: Discussioncontrasting

confidence: 91%

“…The effects of the sintering parameters 27 28 29 30 41 42 and different hydrothermal degradation protocols 28 41 44 47 48 49 50 on the strength of zirconia were investigated. Previous studies 27 30 have demonstrated a decrease in the flexural strength. However, Kong and Park 28 reported that the flexural strength increased after 12 h of sintering.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies 13 14 have shown that the flexural strength of zirconia varies between 608 MPa - 1540 MPa, depending on the sintering parameters, surface treatments, and microstructure. Different surface treatments; 15 16 17 different surface treatments and low-temperature degradation; 18 19 20 sintering parameters; 21 22 23 24 25 26 sintering parameters and aging; 27 28 29 30 and sintering parameters, different surface treatments, and aging 31 have been reported to affect the microstructural properties, roughness, and mechanical strength of Y-TZP ceramics. Although different sintering programs, polishing, and glazing procedures are recommended by manufacturers as surface finishing methods for monolithic zirconia ceramics, the effects of different sintering programs and surface treatments on the surface topography, surface roughness, phase transformation, and flexural strength of monolithic zirconia remain unclear.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussioncontrasting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of sintering programs and surface treatments on monolithic zirconia

Dokuzlu,

Subaşı

2024

J Adv Prosthodont

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“…Chu Liang and Chang Zhisheng [22] [23] conducted acoustic emission signal monitoring on the Brazilian splitting test process of zirconia toughened alu-mina, and found that zirconia toughened alumina ceramics have higher fracture tough-ness compared to alumina ceramics without toughening effect. Scholars have also con-ducted relevant studies on the fracture toughness of zirconia ceramics under different conditions [24] [25] [26] [27]. When studying the deformation and damage of zirconia ceramics, many cracks are excited.…”

Section: Introductionmentioning

confidence: 99%

Study on Acoustic Emission Characteristics of Deformation Damage Process of Zirconia Ceramics

Fu,

Lai

2024

MSCE

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Zirconia ceramics have become increasingly widely used in recent years and are favored by relevant enterprises. From the traditional dental field to aerospace, parts manufacturing has been used, but there is limited research on the deformation and damage process of zirconia ceramics. This article analyzes the acoustic emission characteristics of each stage of ceramic damage from the perspective of acoustic emission, and explores its deformation process characteristics from multiple perspectives such as time domain, frequency, and EWT modal analysis. It is concluded that zirconia ceramics exhibit higher brittleness and acoustic emission strength than alumina ceramics, and when approaching the fracture, it tends to generate lower frequency acoustic emission signals.

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“…Several researchers have investigated the influence of sintering duration and temperature changes on biaxial flexural strength and phase transformation of zirconia. Yet, the consequences of these modifications on the features of monolithic zirconia is still unknown (12)(13)(14)(15). Therefore, this in vitro study was conducted to investigate the properties of monolithic zirconia blocks sintered by speed and high-speed protocols as compared with those sintered using the conventional technique.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Sintering Techniques on the Biaxial Flexural Strength and Crystal Structure of Monolithic Zirconia (In Vitro Study)

Negm,

Abdel Kader,

Mohy El Din

2023

Alexandria Dental Journal

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INTRODUCTION:For monolithic zirconia restorations to be a viable chair-side treatment option, recent studies are aiming to reduce the sintering time required without altering its properties. OBJECTIVES: This study compared the influence of high-speed sintering, speed sintering and conventional sintering on monolithic zirconia regarding bi-axial flexural strength, phase transformation and dimensional changes after sintering. METHODS: Thirty six monolithic zirconia disc specimens were prepared with the dimensions 12mm x 1.5mm and categorized into 3 groups (n=12) based on the sintering technique: High-speed sintering (HS: 1580 °C, total time is approximately 10 minutes) Speed sintering (SS: 1515 °C, total time is approximately 90 minutes), and Conventional sintering (CS, 1500 °C, total time is approximately 10 h). The ball on ring design was used to determine biaxial flexural strength (BFS). Dimensional changes after sintering was evaluated by digital micrometer (with an accuracy of 0.001 mm). The specimen's crystallography was investigated by x-ray diffraction technique (XRD). RESULTS: All groups exhibited a uniform sintering shrinkage of about 20% in all dimensions. Crystallographic analysis revealed only tetragonal and cubic characteristic peaks. BFS test results showed statistically insignificant difference between conventional (1105.5 ± 55.85MPa), speed (1078, and high speed (1050.6±53.42 MPa) sintering cycles (p<0.05). CONCLUSION: Speed and high speed cycles can be recommended for sintering of monolithic zirconia in order to reduce fixed prosthetic restoration fabrication times as the changes they induced were within the clinically acceptable ranges.

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Biaxial flexural strength and phase transformation characteristics of dental monolithic zirconia ceramics with different sintering durations: An in vitro study

Cited by 5 publications

References 32 publications

Effect of sintering programs and surface treatments on monolithic zirconia

Effect of sintering programs and surface treatments on monolithic zirconia

Study on Acoustic Emission Characteristics of Deformation Damage Process of Zirconia Ceramics

Effect of Different Sintering Techniques on the Biaxial Flexural Strength and Crystal Structure of Monolithic Zirconia (In Vitro Study)

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