IADR Abstract Archives
Volume Stability of Amalgam Replacement Materials
Objectives: Given the increasing need to evaluate the longevity of amalgam replacement materials since the implementation of the Minamata Convention. The loss of fillings is a primary reason for retreatment with amalgam replacement materials. High volume stability may help prevent tooth fracture, sensitivity, and filling loss, particularly when a retentive preparation is employed. Thus, the aim of this study was to investigate the volume stability of these materials over a period of 30 days and after thermocycling.
Methods: In this in vitro study, the following amalgam replacement materials were assessed for volume stability: DeltaFil, Equia Forte HT, IonoStar Molar, Ketac Universal, and Cention Forte. Fillings were placed into a 3D-printed metal mold (4mm height x 4mm length x 4mm width) in self-curing mode. Volume stability was evaluated by comparing specific weight (based on the Archimedean principle) and mass using a high-precision scale. Samples were analyzed at multiple time points to allow for the assessment of volume stability over time. Comparisons were analyzed using a repeated measures analysis of variance.
Results: Volume stability was maintained for the glass ionomer cements Ketac Universal and DeltaFil, even after aging simulation through thermocycling. Thermocycling caused an increase in volume for Cention Forte. Equia Forte exhibited an initial volume increase after 1 hour, followed by a subsequent decrease.
Conclusions: This suggests that the type of filling material significantly influences the volume stability of dental fillings. Clinicians may benefit from utilizing materials with better volume stability, as this could contribute to reduced filling loss. The findings provide further insight into the mechanisms behind the reduced loss of fillings in amalgam replacement materials.
Methods: In this in vitro study, the following amalgam replacement materials were assessed for volume stability: DeltaFil, Equia Forte HT, IonoStar Molar, Ketac Universal, and Cention Forte. Fillings were placed into a 3D-printed metal mold (4mm height x 4mm length x 4mm width) in self-curing mode. Volume stability was evaluated by comparing specific weight (based on the Archimedean principle) and mass using a high-precision scale. Samples were analyzed at multiple time points to allow for the assessment of volume stability over time. Comparisons were analyzed using a repeated measures analysis of variance.
Results: Volume stability was maintained for the glass ionomer cements Ketac Universal and DeltaFil, even after aging simulation through thermocycling. Thermocycling caused an increase in volume for Cention Forte. Equia Forte exhibited an initial volume increase after 1 hour, followed by a subsequent decrease.
Conclusions: This suggests that the type of filling material significantly influences the volume stability of dental fillings. Clinicians may benefit from utilizing materials with better volume stability, as this could contribute to reduced filling loss. The findings provide further insight into the mechanisms behind the reduced loss of fillings in amalgam replacement materials.