Mechanical behavior of different machinable ceramic crowns using vertical and horizontal preparations: an in-vitro study
DOI:
https://doi.org/10.4322/bds.2023.e3706Abstract
Objective: the aim of this study was to compare the mechanical behavior of different ceramics when used in thin
vertical preparations versus traditional horizontal preparation. Material and Methods: two stainless-steel dies
were milled to simulate a minimally invasive vertical preparation (VP) and a traditional horizontal preparation
(HP) for an all-ceramic crown of a maxillary first premolar. The stainless-steel dies were duplicated using epoxy
resin. Eighty monolithic crowns were milled and divided into 2 groups according to preparation design. Each
design group was subdivided into 4 sub-groups according to material (n=10): IPS e.max CAD (lithium disilicate),
Bruxzir shaded zirconia (full contour zirconia), CeraSmart (resin nanoceramic) and CEREC Tessera (advanced
lithium disilicate). The crowns were cemented on their relevant epoxy resin dies using self-adhesive resin cement.
All specimens were subjected to 15,000 thermocycles and then loaded to fracture in a universal testing machine.
Data were analyzed using two-way ANOVA and Tukey pair wise comparison test. Results: the fracture resistance
mean values of the VP (1344 + 118 N) was significantly lower than the HP design (1646 + 191 N). Ceramic
crowns made of full contour zirconia had higher fracture resistance mean values (2842 + 380 N) than advanced
lithium disilicate (1272 + 125 N) followed by lithium disilicate crowns (983 + 52 N) and resin nanoceramic
(882 + 61 N). Conclusion: both vertical and horizontal preparations, regardless the different ceramic materials,
showed clinically acceptable fracture resistance values.
KEYWORDS
Dental crown; Prosthodontics; Zirconia; Lithium disilicate; Hybrid ceramics.
Author Biography
Kamal Khaled Ebeid , Ain Shams University, Faculty of Dentistry, Fixed Prosthodontics Department, Cairo, Egypt.
Dr. med. dent. Kamal Ebeid
Doctorate Degree, Christian-Albrechts University, Kiel, Germany
Lecturer of Fixed Prosthodontics, Ain Shams University, Egypt
Member of IADR
Member of ADM
Member of AACD
Published
Versions
- 2023-01-11 (2)
- 2023-01-11 (1)
Issue
Section
License
COPYRIGHT TRANSFER AND RESPONSIBILITY STATEMENT
(PDF)
For all articles published in the BDS journal, copyright is retained by the authors. Articles are licensed under an open-access Creative Commons CC BY 4.0 license, meaning that anyone may download and read the paper for free. In addition, the article may be reused and quoted, provided that the original published version is cited. These conditions allow for maximum use and exposure of the work while ensuring that the authors receive proper credit. All metadata associated with published articles is released under the Creative Commons CC0 Universal Public Domain Dedication.
Before the submission, authors must obtain permission to reproduce any published material (figures, schemes, tables, or any extract of a text) that does not fall into the public domain or for which they do not hold the copyright. Permission should be requested by the authors from the copyright holder (usually the Publisher, please refer to the imprint of the individual publications to identify the copyright holder).
The authors hereby attest that the study is original and does not present manipulated data, fraud, or plagiarism. All names listed made a significant scientific contribution to the study, are aware of the presented data, and agree with the final version of the manuscript. They assume complete responsibility for the ethical aspects of the study.
This text must be printed and signed by all authors. The scanned version should be submitted as supplemental file during the submission process.
