IADR Abstract Archives
Wear of Powder/Liquid Composite in Relation to GIC and Composite
Objectives: To evaluate the wear in vitro of a new ion-releasing powder/liquid composite in relation to glass ionomer cements and conventional composites.
Methods: Flat specimens (8 per material) of the new ion-releasing powder/liquid composite resin Cention N (Ivoclar Vivadent), eleven resin-modified glass ionomer cements (ChemFil Rock, Equia (with and without coat), Fuji II, Fuji IX, Fuji IX GP, Ionofil Molar, Ketac Fil Plus, Ketac Molar, Ketac Universal, Photac Fil, Riva) and two popular composite resins (CeramX, Z350 XT) were processed and luted to aluminium holders. After storage in water at 37°C for 24 hours, the specimens were polished to 2500 grit and subjected to the Ivoclar wear method (Heintze, 2005), which mainly simulates attrition wear using a commercially available chewing simulator (SD Mechatronik, Germany). The Ivoclar wear method correlates moderately with clinical wear (Heintze et al 2012). A standardized stylus made of pressable ceramic (IPS Empress) hits flat specimens 120,000 times with a 5 kg weight and a lateral movement of 0.7 mm under constant exchange of water at different temperatures (5°C/55°C). The vertical loss was measured on plaster replicas with an etkon es1 laser scanner (Willytec) and the Match 3D software.
Results: The mean vertical wear of the resin-modified glass ionomer cements was statistically significantly higher (between 616±44µm (Ionofil Molar) and 946±101µm (Fuji IX GP)) than that of the ion-releasing composite resin Cention N (327±63µm) (ANOVA post-hoc Tukey B, p<0,01) which was in the same statistical group of conventional resins (CeramX 323±31µm, Z350 XT 221±19µm) (ANOVA post-hoc Tukey B, p>0,05).
Conclusions: For permanent posterior restorations, the new ion-releasing powder/liquid composite resin showed wear that was comparable to conventional resin composites and should be preferred over resin-modified glass ionomer cements, whose wear rate was two to three times higher.
Methods: Flat specimens (8 per material) of the new ion-releasing powder/liquid composite resin Cention N (Ivoclar Vivadent), eleven resin-modified glass ionomer cements (ChemFil Rock, Equia (with and without coat), Fuji II, Fuji IX, Fuji IX GP, Ionofil Molar, Ketac Fil Plus, Ketac Molar, Ketac Universal, Photac Fil, Riva) and two popular composite resins (CeramX, Z350 XT) were processed and luted to aluminium holders. After storage in water at 37°C for 24 hours, the specimens were polished to 2500 grit and subjected to the Ivoclar wear method (Heintze, 2005), which mainly simulates attrition wear using a commercially available chewing simulator (SD Mechatronik, Germany). The Ivoclar wear method correlates moderately with clinical wear (Heintze et al 2012). A standardized stylus made of pressable ceramic (IPS Empress) hits flat specimens 120,000 times with a 5 kg weight and a lateral movement of 0.7 mm under constant exchange of water at different temperatures (5°C/55°C). The vertical loss was measured on plaster replicas with an etkon es1 laser scanner (Willytec) and the Match 3D software.
Results: The mean vertical wear of the resin-modified glass ionomer cements was statistically significantly higher (between 616±44µm (Ionofil Molar) and 946±101µm (Fuji IX GP)) than that of the ion-releasing composite resin Cention N (327±63µm) (ANOVA post-hoc Tukey B, p<0,01) which was in the same statistical group of conventional resins (CeramX 323±31µm, Z350 XT 221±19µm) (ANOVA post-hoc Tukey B, p>0,05).
Conclusions: For permanent posterior restorations, the new ion-releasing powder/liquid composite resin showed wear that was comparable to conventional resin composites and should be preferred over resin-modified glass ionomer cements, whose wear rate was two to three times higher.