Development of gingivitis around aged restorations of resin-modified glass ionomer cement, polyacid-modified resin composite (compomer) and resin composite.

Resin-modified glass ionomer cements (RMGIC) and polyacid-modified resin composites (PMC, compomers) are two recently introduced material groups supposed to replace traditional cements in operative dentistry. The new restoratives release initially fluoride in different relatively high concentrations, which decrease gradually during the first weeks in vivo. Earlier studies showed a stronger subclinical inflammatory reaction around different conventional tooth colored restorative materials than around intact enamel. The aim of this study was to compare intra-individually the initiation of gingival inflammation around, aged RMGIC, PMC and resin composite restorations. Subgingivally located Class III restorations were placed in 17 patients. Each patient received one of each of the experimental materials. All patients were placed on an oral hygiene regime 1-year after finishing of the restorations. Gingivitis was induced during a one-week period without oral hygiene. The gingival condition was assessed by sampling of gingival crevicular fluid (GCF), registration of the amount of bacterial plaque and by registration of bleeding after gentle probing of the entrance of the gingival sulcus (SBI) on the experimental filling- and control-enamel surfaces at days 0 and 7. No differences were seen in plaque and gingival index scores between the materials at both days. The GCF increased significantly for all surfaces during the experimental gingivitis period. At day 7 significantly lower GCF was sampled around the enamel surfaces. In conclusion, the differences between the materials did not result in measurable differences concerning clinical or subclinical signs of gingivitis.