Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up

DSpace Repository

Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up

Details

Files for download Overview of item record
Publication Article, peer reviewed scientific
Title Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up
Author Larsson, Christel ; Drazic, Marko ; Nilsson, Eddie ; Vult von Steyern, Per
Date 2015
English abstract
Objective: to compare fracture load and fracture mode of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and metal-ceramic (MC) molar crowns using a modified test set-up to produce fractures similar to those seen in vivo, i.e. fractures of the veneering material rather than complete fractures. Materials and methods: 13 high-noble-alloy MC and 13 Y-TZP molar crowns veneered with porcelain were manufactured. The crowns were artificially aged before final load to fracture. Load was applied using a 7mm diameter steel ball exerting force on the cusps with stresses directed toward the core-veneer interface. Fracture surface analysis was performed using light- and scanning electron microscopy. Results: The test design produced fractures of the veneering material rather than complete fractures. MC crowns withstood significantly (p>.001) higher loads (mean 2155 N) than Y-TZP (mean 1505 N) crowns yet both endure loads sufficient for predictable clinical use. Fracture mode differed between MC and Y-TZP. MC crowns exhibited fractures involving the core-veneer interface but without core exposure. One Y-TZP crown suffered a complete fracture, all others displayed fractures of the veneering material involving the core-veneer interface with core exposure. Conclusions: The test set-up produces fractures similar to those found in vivo and may be useful to evaluate the core-veneer interface of different material systems, both metals and ceramics. The study confirms suggestions from previous studies of a weaker core-veneer bond for Y-TZP compared to MC crowns.
DOI https://doi.org/10.3109/23337931.2015.1057825 (link to publisher's fulltext.)
Link http://www.tandfonline.com/doi/full/10.3109/233379... (external link to publication)
Link http://www.tandfonline.com/doi/full/10.3109/23337931.2015.1057825 .Icon
Publisher Informa Healthcare
Host/Issue Acta Biomaterialia Odontologica Scandinavica;1
Volume 1
ISSN 2333-7931
Pages 35-42
Language eng (iso)
Subject zirconia
metal-ceramic
crowns
fracture strength
fracture mode
failure analysis
in vitro
Medicine
Research Subject Categories::ODONTOLOGY
Handle http://hdl.handle.net/2043/22416 Permalink to this page
Facebook

This item appears in the following Collection(s)

Details

Search


Browse

My Account

Statistics