An Evaluation of the Influence of Different Finishing Lines on the Fracture Strength of Full Contour Zirconia CAD / CAM and Heat Press All - Ceramic Crowns

Al-Joboury, Ahmed Ibrahim Khalaf; Zakaria, Ma'an Rasheed

doi:10.12816/0015265

Cited by 5 publications

(6 citation statements)

References 22 publications

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“…The first study showed that the mean values of fracture resistance for CAD/CAM group showed 1,367.250 + 178.967 N for 90 degrees shoulder margins and 1,109.250 + 252.455 N for the deep chamfer margins. 20…”

Section: Resultsmentioning

confidence: 99%

“…“An evaluation of the influence of different finishing lines on the fracture strength of full contour zirconia CAD/CAM and heat press all-ceramic crowns” 20…”

Section: Resultsmentioning

confidence: 99%

“…Al-Joboury and Zakaria 20 have shown that monolithic zirconia CAD/CAM crowns with a 90-degree shoulder margin have a higher average breaking load than with a deep chamfer margin. However, these two types of margins are considered to be suitable in the premolar and molar regions.…”

Section: Discussionmentioning

confidence: 99%

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Influence of the Type and Thickness of Cervical Margins on the Strength of Posterior Monolithic Zirconia Crowns: A Review

Haddad

Azzi

2022

European Journal of General Dentistry

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Objective The aim of this research is to review the literature for the influence of the thickness and shape of cervical margins on the strength of posterior monolithic zirconia crowns. Materials and Methods Studies to assess the fracture resistance of monolithic zirconia crowns with different types of cervical margins, published from 2014 to 2020, were searched using the electronic database PubMed and Google Scholar using the following keywords: “monolithic zirconia,” “translucent,” “shoulderless,” and “margin preparation design.” Results Analysis of studies has shown that overall the design of the margin would have a significant effect on the strength of these crowns. Monolithic zirconia crowns with a knife-edge margin have shown a breaking load higher than the maximum chewing force of humans. Conclusion It would be safe to suggest the utilization of posterior monolithic zirconia crowns with vertical preparation. As the new translucent monolithic zirconia crowns are recent, further studies would be needed to guide the selection of the appropriate minimum thickness of the knife-edge margin to meet the clinical guidelines for their use.

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Section: Resultsmentioning

confidence: 99%

“…“An evaluation of the influence of different finishing lines on the fracture strength of full contour zirconia CAD/CAM and heat press all-ceramic crowns” 20…”

Section: Resultsmentioning

confidence: 99%

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Influence of the Type and Thickness of Cervical Margins on the Strength of Posterior Monolithic Zirconia Crowns: A Review

Haddad

Azzi

2022

European Journal of General Dentistry

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“…Equal lenghths of RelyX U200 automix were extruded into the internal surface of the crowns which were then placed in its position over the die. A tailored loading device aided to apply a constant load of 5kg parallel to the long axis of each specimen for 5 minutes (21,22) . The head of metal rod was coated with a Teflon layer in order to avoid direct metal to ceramic contact.…”

Section: Bondingmentioning

confidence: 99%

“…Samples were separately fixed on a computer controlled testing machine * with a load cell of 5kN and data recorded using software ** . Fracture test through axial compressive force a with spherical tip (5mm diameter) at cross-head speed 0.5mm/min (21) . Thin foil sheet was applied between the metal sphere and the occlusal surface of the restoration in order to attain homogenous spread of stresses (30) .…”

Section: Fracture Resistance Testingmentioning

confidence: 99%

Fracture resistance of bi-layered and translucent zirconia after thermo-mechanical fatigue

Alzhairi,

Hamdy,

abdelrahman

et al. 2024

Egyptian Dental Journal

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Objective: This study aimed to evaluate the fracture resistance of bi-layered and two types of translucent zirconia after thermo-mechanical fatigue. Materials and Methods: first upper premolar sound natural tooth was prepared and duplicated into epoxy resin die. Forty two full coverage crowns were fabricated and divided into three groups' n= 14 according to type of ceramic material; Group (SHT): full contoured super-high translucent multilayer zirconia system were constructed using CAD/CAM. Group (ST): full contoured super translucent multilayer zirconia system were constructed with CAD/CAM. Group (BZ): Bi-layered zirconia: Fourteen copings were constructed using Solid ZI white with CAD/CAM and then were conventionally veneered with Vita Vm9 (feldspathic porcelain). Crowns were cemented using self-adhesive resin cement. All samples were subjected to thermal cycling (5o -55o C/10,000 cycle) then to chewing simulator (240,000 cycles, 50N). All samples were subjected to fracture resistance test. Results: Fracture resistance values all of the tested groups were (1727.19±311.75 N, 1399.75±130.08 N, 1112.70±195.20N). bi-layered zirconia (BZ) restorations (control group) used in the current study after thermomechanical fatigue, showed higher fracture resistance values than the super translucent monolithic zirconia (ST) and super high translucent monolithic zirconia (SHT) group (intervention groups). Conclusions: all the crowns tested obtained high fracture resistance (above 1000 N) and could n successfully withstand the average clinical masticatory force in the premolar region. The group of bilayered crowns recorded higher fracture resistance mean value than the two groups of translucent monolithic crowns.

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Biochemistry of Serum and Saliva in Obese Individuals with Periodontitis : Case - Control Study

Sarhat¹,

Mohammed²,

Hamad³

2017

JODR

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An Evaluation of the Influence of Different Finishing Lines on the Fracture Strength of Full Contour Zirconia CAD / CAM and Heat Press All - Ceramic Crowns

Cited by 5 publications

References 22 publications

Influence of the Type and Thickness of Cervical Margins on the Strength of Posterior Monolithic Zirconia Crowns: A Review

Influence of the Type and Thickness of Cervical Margins on the Strength of Posterior Monolithic Zirconia Crowns: A Review

Fracture resistance of bi-layered and translucent zirconia after thermo-mechanical fatigue

Biochemistry of Serum and Saliva in Obese Individuals with Periodontitis : Case - Control Study

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