Flexural strength and microstructure of anterior/monolithic zirconia after low-temperature aging

Adabo, Gelson Luís; Mariscal, E.M.; Hatanaka, Gabriel Rodrigues

doi:10.1016/j.dental.2015.08.108

Cited by 6 publications

(5 citation statements)

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“…Autoclave aging has been correlated to no significant change in strength [84,118,119], as well as to significant decrease and increase depending on time of treatment, brand and composition [120,121] of the zirconia system investigated (Table 3, Table 4). Comparing 3 mol% Y-TZP ceramics with translucent monolithic ceramics of higher yttrium amount [101,121,122], significantly higher resistance to aging degradation was recorded for the new generation translucent ceramics, but only after prolonged aging [84,121]. This is not in agreement with Almansour et al [83], whose study found significant differences in several monolithic zirconia systems following shorter periods of aging.…”

Section: Strength Of Monolithic Zirconiamentioning

confidence: 85%

“…Although significant differences were recorded, these exceedingly long periods of accelerating autoclave treatment (usually after 10 h) are beyond the clinical lifespan of a restoration. In the other three studies [99,101,122] investigating the ultra-translucent Pretau Anterior zirconia, no significant differences in strength were recorded after 8 h of steam autoclave treatment in two of the studies [101,122] and significant reduction in one studies [99]. Similarly, no significant change in strength was recorded in another study [84], neither for 3 mol% nor for 5.5 and >6 mol% translucent zirconia ceramics, even after the significant amount of m-ZrO 2 present on their surface (Table 5).…”

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

“…3Y-TZP containing materials showed the highest strengthValues cannot be extrapolated. 12Ce-TZP: almost no change in m-ZrO 2 , 10Ce-TZP: m-ZrO 2 up to 90% and 3Y-TZP: m-ZrO 2 ˜ 50% after 32 days.- 3Y-TZP/Al 2 O 3 Aging in water at 90 °C for 2, 4, and 6 months- 12Ce-TZP/Al 2 O 3 - 10Ce-TZP /Al 2 O 3 All composites had 70/30 vol zirconia/aluminaAdabo et al (2015) [122]- ICE ZirkonFlexural strength (piston-on-three balls), crosshead-speed 1 mm min −1 No significant changeNo values are reported, however all specimens presented increase- PrettauSteam autoclave: 120 °C, 2 kg/cm 2 , 8 h- Prettau AnteriorAlghazzawi et al (2015) [120]- Lava Plus (Lav)Flexural strength (3-point bending), crosshead speed 0.5 mm min −1 Coupons:N/A- Argen HT (Arg)Steam autoclave: 134 °C, 0.2 MPa, 50 hours- increase for Arg, Zir and Zen- Zirlux (zir)- no significant change for Lav, Brux and DDB- BruxZir (Bru)- Zenostar (Zen)- DDBioZX 2 (DDB)Pereira et al (2016) [124]- Zirlux FCFlexural strength (piston-on-three balls), grinded specimens (diamond burs, water cooling), crosshead speed 1 mm min −1 Significant increase of characteristic strength for control, no significant change for the restBefore agingAfter agingSteam autoclave: 134 °C, 2 bars, 20 hControl0%67.97%Fine grinded9.49%38.74%Coarse grinded9.66%...…”

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

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

Kontonasaki

Giasimakopoulos

Rigos

2020

Japanese Dental Science Review

110

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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: Strength Of Monolithic Zirconiamentioning

confidence: 85%

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

Section: Strength Of Monolithic Zirconiamentioning

confidence: 99%

See 1 more Smart Citation

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

Kontonasaki

Giasimakopoulos

Rigos

2020

Japanese Dental Science Review

110

View full text Add to dashboard Cite

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“…Flinn et al stated that the LTD resulted in a significant decrease in flexural strength of Prettau [45,46]. Several studies [47][48][49] have investigated the ultra-translucent Prettau anterior zirconia. Some authors found no significant differences in strength after 8 h of steam autoclave treatment [48,49].…”

Section: Discussionmentioning

confidence: 99%

“…Several studies [47][48][49] have investigated the ultra-translucent Prettau anterior zirconia. Some authors found no significant differences in strength after 8 h of steam autoclave treatment [48,49]. However, a significant reduction in strength was recorded in one study after ageing treatment [47].…”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Translucent Zirconia: An In Vitro Study

Mavriqi

Traini

2023

Prosthesis

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Background: The introduction of translucent zirconia has improved mimetics: nevertheless, a reduction in the mechanical performance was registered. The study aim was to investigate the mechanical characteristics of a high-translucent zirconia used for monolithic restorations before and after the aging process compared to a low-translucent zirconia. Methods: A total of 23 specimens were used in the present study. Group A (n = 10) was made of a high-translucent Y-TZP; group B (n = 7) was made of a low-translucent Y-TZP and finally group C (n = 6) was an aged high-translucent Y-TZP. Flexural strength, fracture toughness, brittleness, microcrack’s propagation and grain size were analyzed. Results: The Vickers hardness was: 1483 ± 187 MPa (group C); 1102 ± 392 MPa (group A); 1284 ± 32 MPa (group B). The flexural strength was: 440 (±96.2) MPa (group C); 427 (±59.5) MPa (group A); 805 (±198.4) MPa (group B). The fracture toughness was: 5.1 (±0.7) MPa.m1/2 (group C); 4.9 (±0.9) MPa.m1/2 (group A); 8.9 (±1.1) MPa.m1/2 (group B). The brittleness was: 295 (±42.8) (group C), 230.9 (±46.4) (group A) and 144.9 (±20.3) (group B). The grain size was: 2.75 (±1.2) µm2 (group A); 0.16 (±0.05) µm2 (group B); 3.04 (±1.1) µm2 (group C). Conclusions: The significant reduction in the mechanical properties of high-translucent zirconia, compared to the traditional one, suggests their use in the anterior/lateral area (up to premolars).

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