Purpose: To test the hypotheses: 1) cumulative survival rates of fully and partially retained high-viscosity glass-ionomer
(HVGIC) ART sealants with heat application and glass-carbomer sealants on occlusal and free-smooth surfaces
are both higher than that of resin sealants; 2) cumulative survival rate of fully and partially retained
high-viscosity glass-ionomer ART sealant with heat application on occlusal and free-smooth surfaces is higher than
that of comparable ART sealants without heat application.
Materials and Methods: The block-randomised clinical trial covered 405 eight-year-old children. The HVGIC was
Ketac Molar Easymix, the glass carbomer was GlassCarbomer and the resin sealant was Clinpro. Retention rates
of sealants on occlusal and free-smooth surfaces using conventional and modified categorisation (fully and partially
retained sealants vs those completely lost [at least one-third of surface re-exposed]) were the dependent variables.
The Kaplan-Meier survival method was used.
Results: The cumulative survival rate of completely and partially retained resin sealants on occlusal (81.2%) and
free-smooth (81%) surfaces after 4 years was statistically significantly higher, and that of glass-carbomer sealants
(10.8% and 21.1%, respectively) was statistically significantly lower than those of the other sealant groups. There
was no statistically significant difference in survival rates of completely and partially retained high-viscosity glass-ionomer ART sealants with (56% for both surfaces) or without heat application (56%) on occlusal and free-smooth
surfaces (55.7% and 59.1%, respectively).
Conclusions: Resin sealants had the highest and glass-carbomer sealants the lowest retention rate after 4 years. Application
of heat to high-viscosity glass-ionomer ART sealants did not result in a significantly higher sealant retention
rate. Use of the modified categorisation for determining sealant retention is advocated.