Simultaneous activation technique: an alternative for bonding composite resin to glass ionomer.
OBJECTIVE
The purpose of this study was to evaluate a new simultaneous activation technique (SAT)-for the union between glass ionomer cements and composite resins.


METHODS
Forty primary molars were embedded in self-curing acrylic resin. Class I cavity preparations were performed on the dentin surface and the teeth were randomly divided into 4 groups (N = 10). Two groups were restored with the SAT and 2 by etching the ionomer surface/sandwich technique (ST). The materials tested were Vidrion F (SS/ White), Vitremer (3M), and Z100 (3M). After 24 hours in aqueous solution at 37 degrees C, a tensile test was performed. The microleakage study was also performed by selecting 40 primary molars which were distributed in the same way as in the bond strength test. Furthermore, 1 tooth from each group of the microleakage test was evaluated by means of scanning electron microscopy.


RESULTS
The SAT and ST did not show statistically significant differences in both tests.


CONCLUSIONS
The SAT is a less complex, quicker, and feasible alternative for the bonding of glass ionomer cements to composite resins in primary molars.
Pinheiro
Sérgio Luiz
SL
Metropolitan University of Santos and PUC-Campinas, Brazil. slpinho@hotmail.com
Oda
Margareth
M
Matson
Edmir
E
Duarte
Danilo Antonio
DA
Guedes-Pinto
Antonio Carlos
AC
D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003763:Dental Leakage / Q000209:etiology; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D008027:Light; D008422:Materials Testing; D008854:Microscopy, Electron; D008963:Molar; D012822:Silicon Dioxide; D013674:Technology, Dental / Q000379:methods*; D013718:Tensile Strength; D014094:Tooth, Deciduous; D015040:Zirconium
D003188:Composite Resins; D005899:Glass Ionomer Cements; C090880:Vidrion F; C084550:Vitremer; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium