Background

Occlusoproximal restorations of primary molars usually fail, so it is necessary to investigate new materials that may overcome this issue. Thus, this trial aimed to evaluate the longevity of occlusoproximal ART restorations in primary molars using a glass ionomer – GIC (Equia Forte® – GC Corp) and a Giomer resin composite – GCR (Beautifil Bulk Restorative® – Shofu Inc) after 24 months.

Methods

182 children aged from 4 to 8 years were selected and randomly assigned to GIC or GCR. A paediatric dentist treated them in the school setting in Cerquilho, Brazil, and the restorations were assessed after 3, 6, 12, 18, and 24 months. The primary outcome was the restoration survival, evaluated using the Kaplan-Meier and superiority Cox regression analyses. Intention-to-treat (ITT) was performed as a sensitivity analysis using superiority test p-value and confidence interval (CI=95%), derived by Miettinen and Nurminen's method. Independent variables included gender, age, molar, jaw, cavity volume, and caries experience.

Results

The restoration survival after 24 months was GIC=58.1% and GCR=49.1% (HR=1.24; CI=0.97-1.59). ITT analysis showed a success of GIC=61.1% and GCR=52.2% (RR=1.17; CI=0.91-1.52). The superiority hypothesis was not proved in both analyses (p>0.05).

Conclusion

GCR does not have superior longevity than GIC in occlusoproximal ART restorations of primary molars.