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Evaluation of the Fracture resistance of Machinable Versus Copy Milling Zirconia Restoration after Cyclic Loading

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Last updated: 04 Jan 2025

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Abstract

Purpose: To evaluate the influence of, layering and mechanical fatigue on the Fracture resistance of Zirconia crown produced using CAD/CAM and copy milling systems. Materials and Methods: One metallic die was fabricated to simulate prepared upper premolar tooth (Tooth 24: with anatomic occlusal reduction,). Using universal milling machine Twenty crowns were fabricated using Prettau zirconia blank with a luting space settings of 60 μm. The fabricated crowns were grouped according to fabrication system in to CAD CAM and copy milling (N=20) as well as each group were divided again in to monolithic and by layered (n=10) Crowns were cemented using Panavia resin cement, then the fracture resistance were measured for half of samples using a instron device,. The other half of samples were subjected to cyclic loading (50 N load, 3700 cycles) and fracture resistance. Data were submitted to three-way ANOVA, and statistical significance was set at p < 0.05. Results: In monolithic groups (MO, CO), the highest fracture resistance was recorded with the CAD/CAM non-loaded samples, (1200.48±41.98N), while the lowest fracture resistance was recorded with the copy milled cyclic loaded samples, (1043±28.04N). In veneered groups (MV, CV), the highest fracture resistance was recorded with the CAD/CAM non-loaded samples, (800±41.57N), while the lowest fracture resistance was recorded with the copy milled cyclic loaded samples, (711±122.89N). Conclusion: CAD/CAM groups recorded statistically significant higher fracture resistance than copy milling groups. Monolithic groups recorded statistically significant higher fracture resistance than veneered groups. The cyclic loading (at 37,000 cycles) has no effects on the fracture resistance in all groups.

DOI

10.21608/ajdsm.2018.71689

Authors

First Name

Reda

Last Name

Attia

MiddleName

Eid

Affiliation

Fixed Prosthodontics Department, Faculty of Dentistry, Al Azher University Crowns and Bridges Department.

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Orcid

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First Name

Ahmed

Last Name

El-kouedi

MiddleName

-

Affiliation

Ass. Professor of Crowns and Bridges Department Al-Azhar University.

Email

-

City

-

Orcid

-

First Name

Hussien

Last Name

Abdulrazek

MiddleName

-

Affiliation

Lecturer of Crowns and Bridges Department Al Azher University Assiut Branch

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Orcid

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Volume

21

Article Issue

5

Related Issue

10905

Issue Date

2018-12-01

Receive Date

2020-02-17

Publish Date

2018-12-01

Page Start

481

Page End

484

Print ISSN

1110-6751

Online ISSN

2682-3314

Article File

AJDSM_Volume 21_Issue 5_Pages 481-484.pdf

PDF . 212.0kB

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https://ajdsm.journals.ekb.eg/article_71689.html

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https://ajdsm.journals.ekb.eg/service?article_code=71689

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Original Article

Type Code

848

Publication Type

Journal

Publication Title

Al-Azhar Journal of Dental Science

Publication Link

https://ajdsm.journals.ekb.eg/

MainTitle

Evaluation of the Fracture resistance of Machinable Versus Copy Milling Zirconia Restoration after Cyclic Loading

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Article

Created At

22 Jan 2023