Knoop microhardness and FT-Raman evaluation of composite resins: influence of opacity and photoactivation source
Braz. oral res
; 25(3): 267-273, May-June 2011. graf, tab
Article
in English
| LILACS
| ID: lil-590046
Responsible library:
BR1.1
ABSTRACT
The aim of this study was to evaluate the degree of conversion by Knoop microhardness (KHN) and FT-Raman spectroscopy (FTIR) of one nanofilled (Filtek Supreme-3M-ESPE [FS]) and one microhybrid composite (Charisma-Heraeus-Kulzer [CH]), each with different opacities, namely enamel, dentin, and translucent, which were photo-activated by a quartz-tungsten-halogen lamp (QTH) and a light-emitting diode (LED). Resin was bulk inserted into a disc-shaped mold that was 2.0 mm thick and 4 mm in diameter, obtaining 10 samples per group. KHN and FTIR values were analyzed by two-way ANOVA and Tukey's tests (α = 0.05). Nanofilled resin activated by a LED presented higher microhardness values than samples activated by a QTH for dentin opacity (p < 0.05). The microhybrid resin showed no differences in KHN or FTIR values with different activation sources or opacity. The nanofilled dentin and enamel resins showed lower FTIR values than the translucent resin. The KHN values of the translucent resins were not influenced by the light source.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Composite Resins
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2011
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Guarulhos University/BR
/
Universidade de São Paulo/BR