Flowable glass ionomer cement layer bonding to sound and carious primary dentin.

Tathiane Larissa Lenzi, Clarissa Calil Bonifácio, Marcelo Bönecker, W Evert van Amerongen, Fernando Neves Nogueira, Daniela Prócida Raggio

Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, Brazil.

Journal of dentistry for children (Chicago, Ill.) 2013 Jan-Apr

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The purpose of this study was to evaluate the effect of a flowable glass ionomer cement (GIC) layer application on bond strength to sound (SD) and carious primary dentin (CD). Flat dentin surfaces from primary molars were randomly assigned to 4 groups (N=5) according to substrate (SD or CD; pH-cycling for 14 days); and layers of GIC (1 layer/control [regular powder/liquid ratio] or 2 layers [first a flowable GIC layer and second a regular powder/liquid ratio layer of GIC]). After 24 hours of water storage, specimens were prepared to be evaluated with the microtensile test (1 mm/min). The fracture pattern was evaluated at 400X magnification (stereomicroscope). The bond strength to SD was higher than to CD when GIC was inserted in 2 layers (P=.02). No significant difference was observed between 1 or 2 layers of GIC insertion (P>.05). For all groups, adhesive/mixed fracture prevailed. The effect of applying the flowable GIC layer on bond strength to dentin is dependent on substrate and results in an increase in adhesion for sound primary dentin.

Citation

Tathiane Larissa Lenzi, Clarissa Calil Bonifácio, Marcelo Bönecker, W Evert van Amerongen, Fernando Neves Nogueira, Daniela Prócida Raggio. Flowable glass ionomer cement layer bonding to sound and carious primary dentin. Journal of dentistry for children (Chicago, Ill.). 2013 Jan-Apr;80(1):20-4