Spectral transmittance of GI-II glass/alumina composite / 华西口腔医学杂志
West China Journal of Stomatology
; (6): 367-369, 2002.
Article
in Zh
| WPRIM
| ID: wpr-279608
Responsible library:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>The purposes of this study were to determine the spectral transmittance of GI-II glass/alumina composites and to explore the effects of different specimen thickness and fining arts of glass infiltration on the transmittance. Data were compared with those of Vita In-Ceram Alumina materials.</p><p><b>METHODS</b>Plate-shaped specimens 12.5 mm in diameter, with 3 thickness (0.5, 1.0, 1.5 mm), 6 color groups for GI-II and 4 color groups for Vita In-Ceram Alumina were fabricated. Specimens of color AL2 for In-Ceram and IG2 for GI-II were selected in the study of relationship between different infiltration arts and transmittance. Five infiltration time duration and three temperatures were studied. A spectrophotometer with standard A light source paralleled light beam 5 mm in diameter and spectra range 380-780 nm was employed to measure the spectral transmittance.</p><p><b>RESULTS</b>The range of spectral transmittance were 2.7%-4.5% for GI-II and 2.4%-5.2% for Vita In-Ceram Alumina. Transmittance decreased with specimen thickness, but they were not linearly related. Transmittance of GI-II tended to increase and that of Vita In-Ceram Alumina decreased as the infiltration temperature elevated. The transmittance increased with infiltration time less than 4 hours and reduced with prolonged time over 6 hours for both materials.</p><p><b>CONCLUSION</b>GI-II glass/alumina composite has comparatively lower translucency. Influences of factors as color, thickness and infiltration arts on translucency of restorations should be considered in the clinical selection of the all-ceramic materials.</p>
Full text:
1
Database:
WPRIM
Main subject:
Spectrophotometry
/
Temperature
/
Tensile Strength
/
Ceramics
/
Chemistry
/
Dental Materials
/
Dental Porcelain
/
Transition Temperature
/
Aluminum Oxide
/
Glass
Language:
Zh
Journal:
West China Journal of Stomatology
Year:
2002
Document type:
Article