The bonding of glass ionomer cements to caries-affected primary tooth dentin.
OBJECTIVE
The purpose of this study was to evaluate the bonding of glass ionomer cements (GICs) to sound and caries-affected dentin by microtensile bond strength (μTBS) and nanoleakage (NL) tests.


METHODS
Occlusal cavity preparations were made in 36 sound primary molars. Half of the specimens were submitted to a pH-cycling model to create simulated caries-affected dentin. Teeth were randomly restored with one of the three materials: (1) resin-modified GIC with nanoparticles (Ketac N100; KN); (2) resin-modified GIC (Vitremer; VI); and (3) high-viscosity GIC (Ketac Molar Easy Mix; KM). Specimens were tested using a microtensile test (1 mm/minute). One specimen from each tooth was immersed in ammoniacal silver nitrate for 24 hours and revealed after eight hours to assess interfacial NL. The μTBS means were analyzed by 2-way analysis of variance and Tukey's post hoc test. For NL, Kruskal-Wallis and Mann-Whitney tests were used (P<.05).


RESULTS
No difference was found between sound and caries-affected dentin (P>.05). KM showed the lowest GIC-dentin μTBS values, while VI and KN showed higher values. Infiltration of ammoniacal silver nitrate into the adhesive interface was not affected by sound or caries-affected dentin.


CONCLUSIONS
Caries-affected dentin does not jeopardize the bonding of glass ionomer cements to primary tooth dentin.
Department of Pediatric Dentistry, School of Dentistry, Universidade Estadual de Ponta Grossa, Ponta Grossa, Parana, Brazil.
Fabiana Bucholdz Teixeira
FB
Alves
Daniela
D
Hesse
Tathiane Larissa
TL
Lenzi
Camila De Almeida Brandão
Cde A
Guglielmi
Alessandra
A
Reis
Alessandro Dourado
AD
Loguercio
Thiago Saads
TS
Carvalho
Daniela Prócida
DP
Raggio
D000704:Analysis of Variance; D001840:Dental Bonding; D003731:Dental Caries / Q000628:therapy*; D003763:Dental Leakage; D003804:Dentin / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D019544:Equipment Failure Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D013718:Tensile Strength; D014094:Tooth, Deciduous
D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements