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CC BY 4.0 · Eur J Dent 2023; 17(01): 120-126
DOI: 10.1055/s-0042-1743143
Original Article

Comparison of Two Types of Preparation for Laminate Veneer with Three Types of All-Ceramic Materials

Salah A. Yousief
1   Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, Dar Al Uloom University, Riyadh, Saudi Arabia
2   Crown and Bridge Department, Faculty of Oral and Dental Medicine, Al Azhar University, Assuit Branch, Egypt
,
Rami M. Galal
3   Fixed and Removable Prosthodontics Department, National Research Centre, Giza, Egypt
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Hassan Mehsen Ahmad Alsharief
5   Private Practice, Egypt
,
Thamer Thyeab R. Alharbi 
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Khaled Aqeel A. Alzhrani 
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Husam Talat A. Migaishet
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Adil Ahmed A. Alshehri
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Ayoub Ismail A. Nouruldeen
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Ghaida Ali S. Sait
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Yousef Jayar
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Reham Alharthi
4   Fixed Prosthodontics Department, AlNahda University, Egypt
,
Sulafah Abdullah Alotaibi
4   Fixed Prosthodontics Department, AlNahda University, Egypt
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Abstract

Objective The objective of this study was to compare types of veneer preparations and their combination with three materials.

Materials and Methods Two finite element models were specially prepared used representing window and wrap around preparation for veneers. The “central incisor” tooth geometry was acquired using a laser scanner, and then its surface was adjusted to form a solid model prior to the removal of each preparation separately. Three materials (Lava Ultimate, IPS e-max, and Celtra) were tested in combination with the preparation type. Bone geometry was simplified as two coaxial cylinders in all models. Each model was subjected to two loading conditions of occlusion (edge-to-edge bite and normal bite).

Statistical Analysis and Results It was observed that cortical, cancellous bone, and periodontal ligament are insensitive to preparation or materials. Their stresses and deformation were within physiological limits. Significant changes appeared on the central incisor tooth structure, cement layer, and veneer layer stresses and deformations under loading cases.

Conclusions Edge-to-edge bite stresses are severe with window-type preparation, and normal bite did not show any critical values on tooth structure, cement layer, or veneer layer. Veneer layer finish line and its contact with the cement layer and tooth structure play a role in the loading transfer mechanism. Preparation type alters the values of stresses on tooth structure, cement, and veneer layers. With window preparation, extreme stresses appear at finish line, while stresses appear under the loading site with wrap around preparation. Veneer and cement layers withstand the load energy with wrap around preparation and reduce tooth structure stresses. Thus, the lifetime of veneer and cement layers might be longer with window preparation.

Keywords

Lava Ultimate - IPS e-max - Celtra


Publication History

Article published online:
12 July 2022

© 2022. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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