Preparation of presintered zirconia blocks for dental restorations through colloidal dispersion and cold isostatic pressing

Amat, Noor Faeizah; Muchtar, Andanastuti; Amril, Muhammad Sufiyan; Ghazali, Mariyam Jameelah; Yahaya, Norziha

doi:10.1016/j.ceramint.2018.01.035

Cited by 19 publications

(8 citation statements)

References 35 publications

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“…Cold isostatic pressing is the most common method for compacting ceramic powders. During cold-isostatic pressing, pressure is applied at ambient temperature, gradually increasing from 50 to 400–1000 MPa and transmitted uniformly on zirconia powder until the green compacts reach 40–60% of their theoretical density prior to sintering [26,27]. Factors enhancing the densification and pore elimination during CIP are nano-sized powder particles, uniform particle size distribution, high specific surface area and low degree of agglomeration.…”

Section: Factors Affecting Strength and Aging Resistance Of Monolithimentioning

confidence: 99%

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Kontonasaki

Giasimakopoulos

Rigos

2020

Japanese Dental Science Review

134

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New zirconia compositions with optimized esthetic properties have emerged due to the fast-growing technology in zirconia manufacturing. However, the large variety of commercial products and synthesis routes, make impossible to include all of them under the general term of “monolithic zirconia ceramics”. Ultra- or high translucent monolithic formulations contain 3–8 mol% yttria, which results in materials with completely different structure, optical and mechanical properties. The purpose of this study was to provide an update to the current knowledge concerning monolithic zirconia and to review factors related to strength and aging resistance. Factors such as composition, coloring procedures, sintering method and temperature, may affect both strength and aging resistance to a more or less extend. A significant reduction of mechanical properties has been correlated to high translucent zirconia formualtions while regarding aging resistance, the findings are contradictory, necessitating more and thorough investigation. Despite the obvious advantages of contemporary monolithic zirconia ceramics, further scientific evidence is required that will eventually lead to the appropriate laboratory and clinical guidelines for their use. Until then, a safe suggestion should be to utilize high-strength partially-stabilized zirconia for posterior or long span restorations and fully-stabilized ultra-translucent zirconia for anterior single crowns and short span fixed partial dentures.

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Section: Factors Affecting Strength and Aging Resistance Of Monolithimentioning

confidence: 99%

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Kontonasaki

Giasimakopoulos

Rigos

2020

Japanese Dental Science Review

134

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“…The suspension was constantly magnetically stirred for 15 min to aid the proper mixing of components. The suspension was subsequently placed in an ultrasonic bath for 10 min to break the agglomerates and milled using a Pulverisette-6 (Fritsch, Germany) planetary ball mill at 300 rpm for 120 min, with 10 mm-diameter zirconia balls as grinding media at a ball-to-powder ratio of 10:1 [8].…”

Section: Materials and Methods 21 Materials And Slurry Preparationmentioning

confidence: 99%

“…Amat et al [8] found that the mechanical properties of zirconia block for dental restoration are improved through colloidal and CIP techniques. However, an appropriate presintering temperature that can be used to produce zirconia block with good strength and that can be mounted into jig without damage during machining is not yet completely studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of Presintering Parameters on the Mechanical Properties of Presintered Dental Zirconia Block

Amat

Raji

Muchtar

et al. 2018

IJIE

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“…By utilizing a special colloidal processing technique, zirconia powder with good particle homogeneity and a packing density of almost 100 wt% can be developed [11]. The combination of wet-processing and slip-casting techniques allows the fabrication of machinable zirconia blocks with good mechanical and aesthetic properties [12][13][14][15]. Furthermore, slip-casted zirconia blocks offer an economical alternative to the traditional compaction process [12] because zirconia slurry can be poured manually into special porous molds (plaster mold) to form zirconia frameworks without the need for specialized machines [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…mm in diameter and 24 mm in length) samples of Zir were fabricated via the colloidal technique and slip-casting process. By using the dispersing technique parameters described by Amat et al[14], a nanozirconia suspension was prepared by mixing nanozirconia powder with distilled water at 1:1.25 weight ratio. Then, 0.5 wt% polyethyleneimine was added to the mixture to disperse the agglomerated zirconia particles, and the suspension pH was adjusted to 2 (Five Easy F20, Mettler Toledo, Swiss) through the addition of hydrochloric solution.…”

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confidence: 99%

Influence of Thermal Expansion on the Bond Strength of Nanozirconia and Veneering Ceramics

Almoualimy

Yew²,

Zaman

et al. 2020

Preprint

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This study was aimed to determine the coefficient thermal expansion (CTE) of colloidal-processed slip-casted novel nanozirconia (Zir) and to elucidate the effect of the differences in CTE values between zirconia cores and veneering porcelains on core–veneer shear bond strength (SBS). CTE measurement was performed on core materials (CMs; Zir and Cercon® [Cer]) and veneering ceramics (VCs; Ceram Kiss® [CK], VITA VM9® [VM9], and IPS e.max Ceram® [e.max]). The SBS test was conducted on six groups of core–veneer samples (Zir–CK, Zir–e.max, Zir–VM9, Cer–CK, Cer–e.max, and Cer–VM9). The mean CTE values (× 10− 6/°C ± standard deviation) of Zir and Cer were 7.86 ± 0.47 and 7.82 ± 0.49, respectively. CK, VM9, and e.max recorded mean CTE values of 7.20 ± 0.62, 7.20 ± 0.29, and 7.10 ± 0.46, respectively. No statistically significant differences were found among the CTE values of CMs and between those of VCs. Zir–VM9 recorded the highest mean SBS value (MPa) of 149.48 ± 67.64, whereas Cer–e.max produced the lowest SBS value of 44.07 ± 16.49. Combinations with high CTE disparities produced low SBS values. CTE discrepancies affected the SBS of veneered zirconia restorations. The novel zirconia showed similar performance and can be used as an alternative to commercial zirconia.

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Preparation of presintered zirconia blocks for dental restorations through colloidal dispersion and cold isostatic pressing

Cited by 19 publications

References 35 publications

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Strength and aging resistance of monolithic zirconia: an update to current knowledge

Influence of Presintering Parameters on the Mechanical Properties of Presintered Dental Zirconia Block

Influence of Thermal Expansion on the Bond Strength of Nanozirconia and Veneering Ceramics

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