Fracture analysis of monolithic CAD‐CAM crowns

Kashkari, Afnan; Yılmaz, Burak; Brantley, William A.; Schricker, Scott R.; Johnston, William M.

doi:10.1111/jerd.12462

Cited by 25 publications

(21 citation statements)

References 42 publications

(116 reference statements)

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“…According to Kashkari et al [32], a sample size of 10 specimens per group was calculated to have a minimum difference between the two groups in terms of fracture toughness. The value of α was determined at 0.05 while the power of the test was 0.80.…”

Section: Methodsmentioning

confidence: 99%

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Fracture Resistance of Zirconia-Reinforced Lithium Silicate Ceramic Crowns Cemented with Conventional or Adhesive Systems: An In Vitro Study

et al. 2020

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In recent years, Zirconia-reinforced Lithium Silicate ceramic (ZLS), combining lithium-silicate and zirconia features, has shown to have excellent mechanical and aesthetic characteristics. Thus, the aim of this study was to compare the fracture strength of ZLS single crowns cemented with two different cementation techniques. Twenty crowns were realised and cemented on teeth replicas achieved from an extracted premolar human tooth. The samples were divided into two groups of 10 specimens each, Glass-ionomeric cement (GIC) group and Self-Adhesive Resin Cement (ARC) group. The mechanical test was performed using a universal testing machine. The specimens were then evaluated with a scanning electron microscope (SEM) to identify for all crowns and related abutments the pattern of fracture after the breaking point. The data obtained were statistically analysed. The mean fracture toughness values and standard deviations (±SD) were 2227 ± 382 N and 3712 ± 319 N respectively for GIC and ARC groups. In fact, t-test showed a statistically significant difference between the two groups (p < 0.001). Moreover, the SEM results demonstrated portions of abutments still attached to the crown fragments in the ARC group, whilst these were not present in the GIC group. Within the limitations of this study, these results suggest the use of adhesive cementation for ZLS crowns, which significantly increase the compressive strength of ZLS restorations compared to GIC.

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Section: Methodsmentioning

confidence: 99%

“…Moreover, in the same study, 18 samples were used in three different groups. Thus, the sample size of 20 is sufficient to have a statistically significant difference in cases between the two groups analysed [32].…”

Section: Methodsmentioning

confidence: 99%

Fracture Resistance of Zirconia-Reinforced Lithium Silicate Ceramic Crowns Cemented with Conventional or Adhesive Systems: An In Vitro Study

et al. 2020

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“…In vitro studies have clearly demonstrated that mechanical properties of zirconia, expressed by parameters like load-to-fracture values, are higher than those of LS 2 , which, from their part, are higher than those of ZLS; the number of fatigue loading cycles does not seem to affect the load-to-fracture of zirconia restorations [23].…”

Section: Low Temperature Degradation (Ltd) and Agingmentioning

confidence: 98%

“…Monolithic LS 2 , as well as Zirconia reinforced-Lithium Silicate ceramics (ZLS), offers higher fracture resistance than bilayered, hand-veneered zirconia [20], while a recent in vitro research has shown that load-to-fracture values of monolithic zirconia are higher than those of LS 2 ; the latter, in turn, are higher than those of ZLS [23].…”

Section: Lithium Disilicate Physico-chemical Features Optical and Mementioning

confidence: 99%

Current status on lithium disilicate and zirconia: a narrative review

et al. 2019

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Background: The introduction of the new generation of particle-filled and high strength ceramics, hybrid composites and technopolymers in the last decade has offered an extensive palette of dental materials broadening the clinical indications in fixed prosthodontics, in the light of minimally invasive dentistry dictates. Moreover, last years have seen a dramatic increase in the patients' demand for non-metallic materials, sometimes induced by metal-phobia or alleged allergies. Therefore, the attention of scientific research has been progressively focusing on such materials, particularly on lithium disilicate and zirconia, in order to shed light on properties, indications and limitations of the new protagonists of the prosthetic scene. Methods: This article is aimed at providing a narrative review regarding the state-of-the-art in the field of these popular ceramic materials, as to their physical-chemical, mechanical and optical properties, as well as to the proper dental applications, by means of scientific literature analysis and with reference to the authors' clinical experience. Results: A huge amount of data, sometimes conflicting, is available today. Both in vitro and in vivo studies pointed out the outstanding peculiarities of lithium disilicate and zirconia: unparalleled optical and esthetic properties, together with high biocompatibility, high mechanical resistance, reduced thickness and favorable wear behavior have been increasingly orientating the clinicians' choice toward such ceramics. Conclusions: The noticeable properties and versatility make lithium disilicate and zirconia materials of choice for modern prosthetic dentistry, requiring high esthetic and mechanical performances combined with a minimal invasive approach, so that the utilization of such metal-free ceramics has become more and more widespread over time.

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“…In recent years, a new CAD/ CAM ceramic material was manufactured to combine the esthetic properties of lithium disilicate and the mechanical properties of zirconia (8). Zirconia-reinforced lithium silicate glass-ceramic is composed of 10% of zirconia in terms of its weight, and these zirconia particles are dissolved inside the metasilicate glassy matrix (9)(10)(11). According to the manufacturer, the homogeneous distribution of zirconia particles improves material strength and finishing (12).…”

mentioning

confidence: 99%