The Zirconia Ceramic: Strengths and Weaknesses

Daou, Elie E.

doi:10.2174/1874210601408010033

Cited by 120 publications

(99 citation statements)

References 142 publications

(298 reference statements)

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“…A growing demand is rising for selection of zirconia-based ceramics that have fracture strength high enough to withstand posterior physiologic loads (34) . However, zirconia still presents a challenge in bonding, in addition to delamination and microcracks of the veneering ceramic material are the most long-term failures observed and reported (20,35) .…”

Section: Discussionmentioning

confidence: 99%

“…However, zirconia still presents a challenge in bonding, in addition to delamination and microcracks of the veneering ceramic material are the most long-term failures observed and reported (20,35) . Marginal discrepancies and marginal gaps of the CAD/CAM zirconia frameworks are frequently recorded (34,36) . Moreover, CAD/CAM zirconia framework requires 6 to 8 hours for sintering and often discourages the delivery of the restoration within the same visit (37) .…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, CAD/CAM zirconia framework requires 6 to 8 hours for sintering and often discourages the delivery of the restoration within the same visit (37) . Besides wear of opposing enamel and lack of translucency (34) , zirconia with an elastic modulus of 210 GPa would not be considered the absolute best choice for IRFPD construction, although the fact that there is no material can fulfill the whole criteria of success. Moreover, low temperature degradation (LTD), or "aging", of zirconia causing detrimental changes in the mechanical behavior, and exposing zirconia frameworks to the risk of spontaneous catastrophic failure (34) .…”

Section: Discussionmentioning

confidence: 99%

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Fracture Resistance and Retention of Metal-Free Inlay Retained Fixed Partial Dentures

et al. 2017

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Statement of the problem: Conservative esthetic restorative dentistry has become an essential component in modern clinical practice. However, the inlay retained fixed partial dentures (IRFPDs) have a higher risk of fracture and dislodgement due to minimal preparations. Purpose: to compare fracture resistance and retention of Lithium disilicate (IPS e.max) and Polyetheretherketone (BioHPP) IRFPDs fabricated with heat-press technique and CAD/CAM system. Materials and Methods: Forty models, each including extracted mandibular 2 nd premolar and 2 nd molar embedded in an epoxy resin block with 10 mm intra-abutment distance representing missing mandibular 1 st molar were constructed. The premolar and molar of each model received standardized class II inlay preparations. The constructed models were randomly divided into four groups; Group (1): IPS e.max Press IRFPDs, Group (2): IPS e.max CAD IRFPDs, Group (3): BioHPP Granulates IRFPDs, and Group (4): breCAM.BioHPP IRFPDs. All IRFPDs were cemented using RelyX Ultimate adhesive resin cement. Samples were stored for 24 hours in distilled water at 37°C, and then thermocycled for 5000 cycles. Universal testing machine was used to measure fracture and dislodging loads. Samples were examined for determination of failure mode using a magnifying lens. Results: The statistically significant highest mean dislodging load value was obtained in IPS e.max Press IRFPDs, followed by IPS e.max CAD, with the least value recorded in breCAM.BioHPP. In contrast, breCAM.BioHPP IRFPDs revealed the statistically significant highest mean fracture load value, followed by BioHPP Granulates, while the least mean fracture value was recorded in IPS e.max Press. Most failure occurred in IPS e.max groups was connector fracture, while in BioHPP groups was plastic deformation. Conclusions: Retention and fracture resistance of metal-free inlayretained bridges are significantly affected by both; material type and construction method. BioHPP has significant advantages for dental applications because of higher fracture resistance and better stress distribution. The bond strength at IPS e.max/ resin cement interface is considered a reliable bond presenting better retention to IRFPDs. Being a brittle material, connector fracture is the predominant failure mode of IPS e.max IRFPDs; however, BioHPP has low elastic modulus showing plastic deformation as a predominant failure mode.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fracture Resistance and Retention of Metal-Free Inlay Retained Fixed Partial Dentures

et al. 2017

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“…Apart from there being the esthetic issue due to gray color of titanium which becomes more prominent when the soft tissue condition is not optimal and it becoming visible through the mucosa [11] It may also cause a greyish discoloration of the peri-implant mucosa where as Ceramic abutments are reported to reduce soft tissue shadowing due to their color and enhanced translucency which may lead to optimal esthetic results in combination with all-ceramic crowns [18]. Plaque accumulation and bacterial colonization on titanium is also one of the bigger drawbacks [24][25][26][27][28][29][30][31][32][33][34].…”

Section: Zirconiamentioning

confidence: 99%

Ceramic Dental Implants: A Literature Review

Askari¹

2017

BJSTR

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“…Zirconia could survive longer in highly-corrosive environments and is considered the best material in chemistry laboratories. It is biocompatible and produces no environmental hazards [3]. This combination of ceramic and metal matrix phase has replaced so many conventional materials, which paved the way for cleaner production in industry and supports the environment.…”

Section: Introductionmentioning

confidence: 99%

Machinability Study of Developed Composite AA6061-ZrO2 and Analysis of Influence of MQL

James

Annamalai

2018

Metals

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Aluminium metal matrix replaces high melting point and high density conventional materials, thus minimizing the usage of energy and supporting the environment. This work develops a low-weight, high-strength composite material with the help of AA 6061 and ZrO 2 through a stir casting route incorporated with a squeeze casting setup. Machining and machining tools create impacts on clean environments, as they deal with lubricants and power consumption. Having taken this issue into consideration, this research studies the effect of machining parameters on surface roughness, tool wear, and cutting force, while turning the developed metal matrix composite in dry and minimum quantity lubrication conditions. The turning experiment was performed by designing parameters using an L 27 orthogonal array. The turning condition was dry and with minimum quantity lubrication (MQL). The responses obtained in the turning process were analysed using the analysis of variance (ANOVA) technique to find the most influential factor and its percentage contribution. Optimal machining parameters were investigated and tabulated with the help of main effect plots and S/N ratio graphs. Studies prove that there is a linear relationship between MQL versus surface roughness and tool wear, and there was no substantial effect on cutting force.

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The Zirconia Ceramic: Strengths and Weaknesses

Cited by 120 publications

References 142 publications

Fracture Resistance and Retention of Metal-Free Inlay Retained Fixed Partial Dentures

Fracture Resistance and Retention of Metal-Free Inlay Retained Fixed Partial Dentures

Ceramic Dental Implants: A Literature Review

Machinability Study of Developed Composite AA6061-ZrO2 and Analysis of Influence of MQL

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