|
KMID : 1035320190460040185
|
|
Korean Society for Dental Materials
2019 Volume.46 No. 4 p.185 ~ p.194
|
|
|
Effect of glazing on the flexural strength of lithium disilicate glass ceramics
|
|
Sim Jae-Hoon
Lee Joong-Bae
Hwang Seong-Sig
|
|
|
Abstract
|
|
|
|
The purpose of this study was to investigate the relationship between glazing treatment and flexural strength of dental lithiumdisilicate glass ceramics. Three commercial lithium disilicate glass ceramic blocks were cut to size and polished with abrasivepapers and diamond pastes. The specimens were prepared in accordance to the manufacturer’s instruction for the crystallizationprocess and divided into three groups. The first group was over-glazed with glazing paste and liquid. The second group wasself-glazed at a normal over-glazing temperature without glazing paste and liquid. The third group was an untreated controlgroup. The three-point flexural test was carried out using the universal testing machine. The broken specimens were examinedby SEM/EDS. The over-glazed group showed lowest flexural strength. There was no statistically significant difference betweenself-glazed group and untreated group with respect to flexural strength. The bubbles and cracks were found in the glaze layerof over-glazed group. As the tensile stress was concentrated at the bottom of glaze layer during the flexural test, it was evidentthat the bubbles played a role in initiation and propagation of cracks. A mixed layer formed between glaze layer and glassceramic during the over-glazing process could have negative effects on the flexural strength of entire specimen.
|
|
|
KEYWORD
|
|
|
Glazing, Lithium disilicate, Glass ceramic, Flexural strength
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|