PURPOSE: To assess the nature of clinically detectable alterations in glass-ionomer after long-term clinical service. METHODS: In addition to clinical macro pictures, SEM was carried out on replicas and on two sectioned primary molars SEM-EDAX analysis was performed to determine chemical transformation in the glass-ionomer. Also with SEM-EDAX, the composition was determined of a partially removed half-year old sealant. RESULTS: The clinically observed altered optical aspect and increased hardness could be related with surface structure changes as identified by SEM. The changed glass-ionomer showed a continuous integration with the adjacent enamel. The SEM-EDAX analysis revealed an increase of calcium and phosphorus in the surface layer, tentatively suggesting a sort of additional "mineralization" of the material. This phenomenon was only observed for restorations that had minimally 2-3 years in vivo dwell time.
PURPOSE: To assess the nature of clinically detectable alterations in glass-ionomer after long-term clinical service. METHODS: In addition to clinical macro pictures, SEM was carried out on replicas and on two sectioned primary molars SEM-EDAX analysis was performed to determine chemical transformation in the glass-ionomer. Also with SEM-EDAX, the composition was determined of a partially removed half-year old sealant. RESULTS: The clinically observed altered optical aspect and increased hardness could be related with surface structure changes as identified by SEM. The changed glass-ionomer showed a continuous integration with the adjacent enamel. The SEM-EDAX analysis revealed an increase of calcium and phosphorus in the surface layer, tentatively suggesting a sort of additional "mineralization" of the material. This phenomenon was only observed for restorations that had minimally 2-3 years in vivo dwell time.
Authors: Xi Chen; Minquan Du; Mingwen Fan; Jan Mulder; Marie-Charlotte Huysmans; Jo E Frencken Journal: Clin Oral Investig Date: 2011-11-29 Impact factor: 3.573
Authors: Liana Beresescu; Monika Kovacs; Alexandru Vlasa; Alexandra Mihaela Stoica; Csilla Benedek; Mihai Pop; Denisa Bungardean; Daniela Eșian Journal: Int J Environ Res Public Health Date: 2022-02-10 Impact factor: 3.390