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Published on: December 20, 2024
The bonding of glass ionomer cements to caries-affected primary tooth dentin
Fabiana Bucholdz Teixeira Alves1, Daniela Hesse, Tathiane Larissa Lenzi
1Department of Pediatric Dentistry, School of Dentistry, Universidade Estadual de Ponta Grossa, Ponta Grossa, Parana, Brazil.
Purpose:
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.
Conclusion:
Caries-affected dentin does not jeopardize the bonding of glass ionomer cements to primary tooth dentin.
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