FRACTURE RESISTANCE OF ULTRA TRANSLUCENT ZIRCONIA VERSUS LITHIUM DISILICATE IMPLANT SUPPORTED HYBRID ABUTMENT CROWNS TO TI BASE (AN IN-VITRO STUDY)

Abd El Naby, Dina Magdy; alansary, hesham; El Banna, Hayat Ibrahim Mahrous

doi:10.21608/edj.2024.331678.3245

	FRACTURE RESISTANCE OF ULTRA TRANSLUCENT ZIRCONIA VERSUS LITHIUM DISILICATE IMPLANT SUPPORTED HYBRID ABUTMENT CROWNS TO TI BASE (AN IN-VITRO STUDY)
Egyptian Dental Journal
Volume 71, Issue 1 - Serial Number 4, January 2025, Page 619-630 PDF (1.16 MB)
Document Type: Original Article
DOI: 10.21608/edj.2024.331678.3245
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Authors
Dina Magdy Abd El Naby ¹; hesham alansary ²; Hayat Ibrahim Mahrous El Banna ³
¹MSc, Fixed Prosthodontics,Faculty of Dentistry, Cairo University, Giza, Egypt
²Professor, Fixed Prosthodontics , Cairo University
³Assistant Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
Abstract
ABSTRACT Aim of the study: to construct implant supported titanium based hybrid abutment crown from traditional lithium disilicate block/ultratranslucent zirconia disc with the help of five axis milling machine and to compare the fracture resistance of the two material. Materials and methods: A total number of 24 (implant with titanium base abutment) samples were made and divided into two groups :The first group received ultra translucent zirconia hybrid abutment crown (Z), the second group received lithium disilicate hybrid abutment crown (L). All samples were exposed to a thermocycling and cyclic loading, to measure the strenght of the two materials crown samples were subjected to a static load in universal testing machine parallel to the long axis of the tooth using a metallic rod covered by aluminum foil to distribute the forces evenly till fracture of the specimen. The collected data were arranged in tabular form and statistically analysed. Results: Implant supported ultratranslucent zirconia hybrid abutment crown showed significant higher fracture resistance (939.72 ± 70.99) than those of lithium disilicate hybrid abutment crown (874.88 ± 40.45) with (65.83 ± 23.59) difference as P=0.01, the results of both crowns showed readings above the clinical acceptable range(300-400N) Conclusions: Ultratranslucent zirconia showed higher fracture resistance than lithium disilicate hybrid abutment crown.
Keywords
KEYWORDS: Dental implants; CAD/CAM; hybrid abutment crown; IPS e. max CAD; cyclic load


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