Microhardness of glass ionomer cements indicated for the ART technique according to surface protection treatment and storage time.
The aim of this study was to assess the microhardness of 5 glass ionomer cements (GIC) - Vidrion R (V, SS White), Fuji IX (F, GC Corp.), Magic Glass ART (MG, Vigodent), Maxxion R (MR, FGM) and ChemFlex (CF, Dentsply) - in the presence or absence of a surface protection treatment, and after different storage periods. For each GIC, 36 test specimens were made, divided into 3 groups according to the surface protection treatment applied - no protection, varnish or nail varnish. The specimens were stored in distilled water for 24 h, 7 and 30 days and the microhardness tests were performed at these times. The data obtained were submitted to the ANOVA for repeated measures and Tukey tests (alpha = 5%). The results revealed that the mean microhardness values of the GICs were, in decreasing order, as follows: F > CF = MR > MG > V; that surface protection was significant for MR, at 24 h, without protection (64.2 + or - 3.6a), protected with GIC varnish (59.6 + or - 3.4b) and protected with nail varnish (62.7 + or - 2.8ab); for F, at 7 days, without protection (97.8 + or - 3.7ab), protected with varnish (95.9 + or - 3.2b) and protected with nail varnish (100.8 + or - 3.4a); and at 30 days, for F, without protection (98.8 + or - 2.6b), protected with varnish (103.3 + or - 4.4a) and protected with nail varnish (101 + or - 4.1ab) and, for V, without protection (46 + or - 1.3b), protected with varnish (49.6 + or - 1.7ab) and protected with nail varnish (51.1 + or - 2.6a). The increase in storage time produced an increase in microhardness. It was concluded that the different GICs, surface protection treatments and storage times could alter the microhardness values.
Shintome
Luciana Keiko
LK
Department of Restorative Dentistry, School of Dentistry of São José dos Campos, São Paulo State University (UNESP), São José dos Campos, SP, Brazil. lushintome@ig.com.br
Nagayassu
Marcos Paulo
MP
Di Nicoló
Rebeca
R
Myaki
Silvio Issáo
SI
D000704:Analysis of Variance; D057087:Dental Atraumatic Restorative Treatment / Q000295:instrumentation / Q000379:methods*; D003736:Dental Cavity Lining / Q000295:instrumentation*; D004356:Drug Storage / Q000379:methods; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006245:Hardness Tests; D008422:Materials Testing; D013499:Surface Properties; D013997:Time Factors
D005899:Glass Ionomer Cements