Fatigue strength of several dental ceramics indicated for CAD-CAM monolithic restorations

Nishioka, Gabriela Nogueira de Melo; Prochnow, Catina; Firmino, Aline Silva; Amaral, Marina; Bottino, Marco Antônio; Valandro, Luiz Felipe; de, Melo Renata Marques

doi:10.1590/1807-3107bor-2018.vol32.0053

Cited by 44 publications

(29 citation statements)

References 34 publications

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“…Though the manufacturer advocates that the addition of zirconia to ZLS composition increases strength, a previous study could not verify this 17 . The results of the current study agree with other studies [17][18][19] . Wendler 18 examined both brands of zirconia reinforced lithium silicate, Vita suprinity and Celtra duo, and found a lower strength values than other tested groups.…”

Section: Discussionsupporting

confidence: 93%

Comparative Study of Fracture Resistance of Different Ceramic Restorations

Mogahed

Shakal

Hasaneen

2021

Egyptian Dental Journal

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Objective: Comparison of fracture resistance of different ceramic restorations.Methodology: 64 ceramic crowns were fabricated. They were divided into 4 equal groups according to the type of ceramic used (16 each). Group I: lithium disilicate, Group II: Zirconia reinforced lithium silicate, Group III: monolithic zirconia and Group IV: bilayered zirconia. Models of prepared teeth #14 were used as abutments. Eight specimens from each group were subjected to thermocycling between 55° C and 5° C. Fracture resistance was tested for the specimens. The load to fracture was recorded. Mean value for each group was calculated and differences between groups were tested for statistical significance. One fractured specimen from each group was scanned by scanning electron microscope to determine the failure mode.Results: it was found that the highest fracture resistance mean value was recorded with monolithic zirconia group followed by lithium disilicate group then bilayered zirconia group while the lowest fracture resistance mean value was recorded for zirconia reinforced lithium silicate group and this was statistically significant. The four tested groups showed lower fracture resistance mean values after thermocycling. The fractography showed that surface defects were the origin of fracture in glass ceramic groups. While monolithic zirconia showed internal surface cracks. Conclusions:Within the limitations of this study, the following conclusions can be drawn: monolithic zirconia has the highest fracture resistance among the tested groups, while zirconia reinforced lithium silicate group has the lowest fracture resistance. Thermal aging significantly reduces the fracture resistance in the four tested groups.

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Section: Discussionsupporting

confidence: 93%

Comparative Study of Fracture Resistance of Different Ceramic Restorations

Mogahed

Shakal

Hasaneen

2021

Egyptian Dental Journal

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“…After cyclic loading, high translucency tetragonal zirconia demonstrated the higher fatigue strength among a feldspathic ceramic, a polymer-infiltrated ceramic network, a lithium disilicate glass-ceramic and a zirconia-reinforced lithium silicate glass-ceramic [81]. According to Pereira et al [82], third generation ultra-translucent monolithic zirconia materials present no transformation toughening when aged as well as significantly inferior mechanical properties.…”

Section: Strength Of Monolithic Zirconiamentioning

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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“…The STL files for the crowns and the die were converted into solid models using solid modeling software (SolidWorks 2018, DS Solidworks Corp, USA) to produce the 3D model to be used for FEA. The mechanical properties were set for the components of the 3D model including the CAD/CAM materials used for crowns 48 , 49 ( Table 2 ). The crowns were made from two different materials, Zirconia and lithium disilicate.…”

Section: Methodsmentioning

confidence: 99%

<p>Fatigue Failure Load of Molars with Thin-Walled Prosthetic Crowns Made of Various Materials: A 3D-FEA Theoretical Study</p>

Mortadi

Bataineh

Janaideh

2020

CCIDE

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Purpose The aim of the study was to compare the fatigue lifetime of thin-walled molar crowns made of all-ceramic CAD/CAM materials under three different cyclic load conditions. Methods The crowns were fatigued using a range of forces similar to which crowns in the molar region might be subjected. Crowns of two thin-walled thicknesses (0.7 mm and 1.1 mm) were prepared from Zirconia and lithium disilicate. Numerical methodologies to simulate the behavior of a restored tooth were applied to evaluate the fatigue lifetimes under multiple cyclic loading; 50 N, 100 N, 150 N. An 8 mm hemispherical indenter was used to simulate the mechanical stress of opposing teeth during mastication, and applied the fatigue load at the center of the crowns. Results The results show that the predicted survival rates for 0.7 mm and 1.1 mm Zirconia crowns were not significantly different. The number of life cycles predicted for Zirconia under all fatigue loads indicates that these crowns can live longer than five clinical years (when crowns are in service). However, crowns made from lithium disilicate also can be predicted to survive longer than five clinical years (under load up to 100 N). Crowns made of lithium disilicate should have 1.1 mm thickness to survive longer than five clinical years (when crowns are in service). Conclusion Zirconia crowns exhibit significantly higher fracture resistance compared with lithium disilicate crowns, making them better suited to handle higher masticatory loads encountered in the posterior region of the mouth. Lithium disilicate can survive more than five clinical years (when their thickness is 1.1 mm).

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Fatigue strength of several dental ceramics indicated for CAD-CAM monolithic restorations

Cited by 44 publications

References 34 publications

Comparative Study of Fracture Resistance of Different Ceramic Restorations

Comparative Study of Fracture Resistance of Different Ceramic Restorations

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

<p>Fatigue Failure Load of Molars with Thin-Walled Prosthetic Crowns Made of Various Materials: A 3D-FEA Theoretical Study</p>

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