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

Document Type : Original Article

Authors

1 MSc, Fixed Prosthodontics,Faculty of Dentistry, Cairo University, Giza, Egypt

2 Professor, Fixed Prosthodontics , Cairo University

3 Assistant 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

Main Subjects

Egyptian Dental Journal
Volume 71, Issue 1 - Serial Number 4
January (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
January 2025
Pages 619-630

Files

Share

How to cite

Statistics