Chulalongkorn University; Rangsit University; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC); Chulalongkorn University; Chulalongkorn University
Type
Article
Source Title
DENTAL MATERIALS JOURNAL
ISSN
0287-4547
Year
2015
Volume
34
Issue
3
Page
302-309
Open Access
gold
Publisher
JAPANESE SOC DENTAL MATERIALS DEVICES
DOI
10.4012/dmj.2014-319
Format
PDF
Abstract
This study investigated the shear bond strength (SBS) between veneering porcelain and zirconia substructure using lithium disilicate glass-ceramic as a liner. The mineral phases and microstructures of lithium disilicate glass-ceramic at temperature range of 800 900 degrees C were preliminarily investigated. SBSs of porcelain-veneered zirconia specimens with and without lithium disilicate glass-ceramic liner fired at the same temperature were determined. Results showed that SBSs of veneering porcelain and zirconia with lithium disilicate glass-ceramic liner was notably increased (p<0.05). Specimens from the group with the highest SBS (59.7 MPa) were subject to thermocycling up to 10,000 cycles and their post-thermocycling SBSs investigated. Though weakened by thermocycling, SBSs were above the clinically acceptable limit (25 MPa) of ISO 9693. Fractographic analysis revealed mixed cohesive and adhesive failures. It was concluded that lithium disilicate glass-ceramic is a potential liner which generated high SBS between veneering porcelain and zirconia.
