Flowable glass ionomer cement as a liner: improving marginal adaptation of atraumatic restorative treatment restorations.
OBJECTIVE
The present study aims to evaluate the in vitro microleakage of two layers GIC proximal restorations in primary molars.


METHODS
Forty primary molars received proximal cavity preparations and were randomly divided in two groups. G1 was restored with a regular powder/liquid ratio GIC. G2 firstly received a flowable layer of GIC and secondly a regular GIC layer. After 24h water storage (37 degrees C), the teeth were made impermeable with the exception of the restoration area and 1 mm of their surrounding, immersed in 0.5% methylene blue solution (4h), rinsed and sectioned mesio-distally. One side was polished and analyzed under light microscope. Replicates from the other side were observed under SEM. Microleakage evaluation was carried out by 3 evaluators.


RESULTS
The data analysis (Mann-Whitney) showed a significant (P<0.01) better result for G2. Regarding the SEM evaluation, irregularities were observed in the G1 at the tooth/GIC interface. For G2, it was not possible to observe any displacement of the GIC in relation to the tooth structure, which confirmed better adaptation as seen in the microleakage test.


CONCLUSIONS
the insertion of a flowable GIC layer in proximal cavities before the insertion of a regular GIC layer improves the material adaptation to the tooth.
Bonifácio
Clarissa Calil
CC
Department of Pediatric Dentistry, Academic Centre for Dentsitry Amsterdam (ACTA), Amsterdam, The Netherlands. C.Bonifacio@acta.nl
van Amerongen
W Evert
WE
Meschini
Tatiana Galindo
TG
Raggio
Daniela Prócida
DP
Bönecker
Marcelo
M
D003736:Dental Cavity Lining / Q000379:methods*; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003804:Dentin / Q000648:ultrastructure; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008751:Methylene Blue; D008855:Microscopy, Electron, Scanning; D008963:Molar; D011897:Random Allocation; D018709:Statistics, Nonparametric; D013499:Surface Properties
D005899:Glass Ionomer Cements; D008751:Methylene Blue