Mechanical Behavior of Different Treatment Planes for Restoring Endodontically Treated Premolars with Modified Glass Ceramic

Document Type : Original Article

Authors

Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry, Assiut University, Egypt.

Abstract

Objectives
The purpose of this research is to investigate the impact that the restoration design (either "3-mm deep endocrown," "5-mm deep endocrown," or "5-mm deep post&crown") & the kind of CAD/CAM material have on load-to-failure of endodontically managed premolars when there is no ferrule present.
Methods
The crowns of forty-five premolars with a single root have been removed and endodontic treatment was performed on the roots. The teeth have been randomly separated into three groups, each consisting of fifteen. The teeth in each group were repaired with either traditional crowns (five millimeters deep post-crown) or standardized CAD/CAM-fabricated endocrowns (two millimeters or five millimeters deep intra-radicular extension). Following the application of luting resin cement for the procedure of cementation, the specimens have been immersed in distilled water and then exposed to 25000 cycles of thermos cycling. Once that has been done, a universal testing apparatus has been utilized to apply a compressive load on the tooth at an angle of ninety degrees to its long axis until the tooth broke. Following the recording of the load-to-failure (N) value, the samples have been studied using a stereomicroscope with a magnification of 3.5x in order to ascertain the manner of failure.
Results
All of the specimens were able to endure the aging process that was brought about by the 25000 cycles of thermos cycling without suffering any obvious harm. utilizing One-way ANOVA. A non-significantly greater load-to-failure has been observed for the ‘5-millimeters deep endocrown over than other groups.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2511-2520

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