PubMed · 10605208
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R Suhonen. 1996. [Caustic ulcers].. https://pubmed.ncbi.nlm.nih.gov/10605208/
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OBJECTIVE: To compare a silver-reinforced glass ionomer material (cermet) with a resin-modified glass ionomer in minimal Class II preparations in primary teeth. METHODS: Matched pairs of primary molars with approximal caries that required operative treatment were used. Each cavity was filled with either Vitremer or Ketac-Silver. The restorations were followed for at least 36 months and examined annually using bitewing radiographs and clinical inspections. Impressions were taken at each recall and models were examined microscopically. RESULTS: After 36 months, one of the resin-modified glass ionomer (RMGI) restorations and 13 (26.5%) of the silver cermet restorations had failed. The RMGI failed because of secondary caries, while most of the failures of the silver cermet fillings were marginal defects alone or in combination with secondary caries. The median survival time (MST) for the silver cermet restorations was 37 months. The RMGI restorations had a MST exceeding 42 months, but MST could not be calculated exactly because of the low failure rate during the study period. CONCLUSIONS: The resin-modified glass ionomer had the overall best performance of the two materials under comparison. The silver cermet material cannot be recommended for Class II restorations in primary teeth.
The objective of this in-vitro study was to determine the influences of storage, thermal and load cycling as well as combinations of these treatment procedures on the microleakage patterns of a new 'condensable' silver reinforced restorative glass-ionomer cement (Shofu Hi-Dense). Class II preparations with gingival margins in dentine were made on 50 freshly extracted, non-carious molar teeth and restored with Shofu Hi-Dense according to the manufacturer's instructions. The restorations were subsequently stored for 1 week, finished and randomly assigned into five groups of 10 and treated as follows: Group 1 - control (uncycled); Group 2 - thermocycled; Group 3 - mechanically load cycled; Group 4 - three months storage, uncycled; Group 5 - three months storage, thermal and load cycled. The storage medium throughout the experiment was artificial saliva at 37 degrees C. All treatment procedures had no significant influence on microleakage at the enamel-cement interface. These treatment modalities, however, resulted in a significant increase in leakage at the dentine-cement interface. With the exception of the 1 week storage, uncycled group, the dentine-cement interface had significantly greater leakage than the enamel-cement interface.
The strength of a modern, low metal:glass ratio, metal-reinforced glass-ionomer cement was measured evaluating a number of protective barriers: one light-cured resin, two solvent-based dental varnishes and petroleum jelly. The cement was exposed to water at 10 and 60 min from start of mix. The results obtained with these protecting agents were compared with those obtained where no protection was applied. A comparison of uniaxial flexural strength and biaxial flexural strength showed the latter to be more discriminating. Proprietary dental varnishes were superior to petroleum jelly, producing similar strengths of 50 MPa. Petroleum jelly was, however, preferable to no protection. Moisture protection during the first 30 min was found to be beneficial, thereafter no further strength increase was found. A second material, a cement which has a high metal:glass ratio, was found to be more moisture resistant but weaker in strength than the modern material, with a biaxial strength of 39 MPa.