engleski

Retention of thermo-cured glass ionomer and resin- based fissure sealant - a comparative clinical study

Objectives: The aim of this study was to investigate retention of thermo-cured highly viscous glass ionomer (GIC) fissure sealant after one year of clinical trial. Recent studies showed that application of heat during setting of glass ionomer cements (GIC) can improve mechanical properties of material. This also might improve retention rate of GIC sealant. The purpose of this study was to asses retention rate of GIC fissure sealants heated during setting time. Methods: Eigthy teeth with well-delineated fissure morphology divided in two groups were sealed with highly viscous glass ionomer (Fuji Equia Fil, GC) and Helioseal F (Vivadent, Liechtenstein) using split mouth design. Helioseal F was placed and set according manufacturers instruction using polymerization unit Bluephase 16i (Vivadent, Liechtenstein). GIC was heated with external heat source (Bluephase 16i, Vivadent, Liechtenstein) during setting time. Teeth in group A were sealed with Fuji Equia Fil and in group B with Helioseal F. Replicas of occlusal surfaces sealed with Fuji Equia Fil were analysed with SEM (Scanning Electron Microscope (SEM) (XL30, Philips, Eindhoven, The Netherlands)). To obtain replicas, the impression with a polyvinyl- siloxane impression material was taken and poured in acrylic resin (ClaroCit Kit, Struers A/S, Ballerup, Denmark). Results: Retention rate in group A was 75% after one year of clinical service. Group B showed retention rate of 82.5%. There was no secondary caries lesions in either group. Difference between retention rate of thermo- cured highly viscous glass ionomer and resin sealants was not statisticaly significant. Thermo-cured glass ionomer showed comparable retention rate when compared with a resin based sealant. SEM analysis showed good surface adaptation without a clear transition between GIC and the enamel. Conclusions: The heating procedure during setting of GIC sealants could be recommended as routine clinical practice. Future studies are required to examine the long-term performance of thermo-cured highly viscous glass ionomer sealants.

glass ionomer ; fissure sealing ; thermo-curing

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