IADR Abstract Archives
Compressive Strength Versus Stabilization Process of Restorative Glass-ionomer Cements
Objectives: To evaluate the compressive strength (CS) of different restorative glass-ionomer cements (GIC) and to correlate this with the dynamics of their chemical stabilization process.
Methods: Eighteen brands of GIC were tested: Bioglass R (Biodinâmica, Brazil) [B], Chemfil Rock (Dentsply, USA) [CR], Equia Forte (GC, Japan) [EF], Gold Label 2 (GC, Japan) [GL2], Gold Label 9 (GC, Japan) [GL9], Glass Ionomer Cement Type II (Shofu, Japan) [GI], Ionglass R (Maquira, Brazil) [IG], Ion Z (FGM, Brazil) [IZ], Ionomaster (Wilcos, Brazil) [IM], Ionofil Plus (Voco, Germany) [IP], Ionostar Plus (Voco, Germany) [IS], Ketac Molar Easymix (3M ESPE, Germany) [KM], Magic Glass R (Vigodent, Brazil) [MG], Maxxion R (FGM, Brazil) [Ma], Riva Self Cure (SDI, Australia) [R], Vidrion R (SS White, Brazil) [V], Vitro Fil R (Nova DFL, Brazil) [VF] and Vitro Molar (Nova DFL, Brazil) [VM]. Specimens of each material (n=5) were prepared according to ISO 9917-1:2007 and then subjected to the CS test in an universal testing machine with a 200 KgF load cell. The stabilization time (ST) of chemical bonds of the GIC were examined by Fourier Transform Infrared spectroscopy (FTIR) every 10 min for 120 min. The results were analyzed with ANOVA and Tukey test (α= 5%). The Spearman Rank Correlation test was used to test the dependence between the CS and ST results.
Results: The highest CS values were obtained for materials EF, GL9, GI and KM (p>0.05). The lowest CS values were registered for IM, VF, MG and B (p>0.05). The other materials presented intermediate values. The highest ST was found for GL2 and the lowest was for B (p<0.05). The Spearman Correlation test found ST correlating positively with CS (rho = 0.57), except for VF that has a long ST value but is a very weak material, and KM that is a strong material but has a short ST value.
Conclusions: GICs with longer chemical bonds stabilization times are generally stronger, and the ST value obtained from FTIR is useful in predicting the strength of the majority of GICs tested.
Methods: Eighteen brands of GIC were tested: Bioglass R (Biodinâmica, Brazil) [B], Chemfil Rock (Dentsply, USA) [CR], Equia Forte (GC, Japan) [EF], Gold Label 2 (GC, Japan) [GL2], Gold Label 9 (GC, Japan) [GL9], Glass Ionomer Cement Type II (Shofu, Japan) [GI], Ionglass R (Maquira, Brazil) [IG], Ion Z (FGM, Brazil) [IZ], Ionomaster (Wilcos, Brazil) [IM], Ionofil Plus (Voco, Germany) [IP], Ionostar Plus (Voco, Germany) [IS], Ketac Molar Easymix (3M ESPE, Germany) [KM], Magic Glass R (Vigodent, Brazil) [MG], Maxxion R (FGM, Brazil) [Ma], Riva Self Cure (SDI, Australia) [R], Vidrion R (SS White, Brazil) [V], Vitro Fil R (Nova DFL, Brazil) [VF] and Vitro Molar (Nova DFL, Brazil) [VM]. Specimens of each material (n=5) were prepared according to ISO 9917-1:2007 and then subjected to the CS test in an universal testing machine with a 200 KgF load cell. The stabilization time (ST) of chemical bonds of the GIC were examined by Fourier Transform Infrared spectroscopy (FTIR) every 10 min for 120 min. The results were analyzed with ANOVA and Tukey test (α= 5%). The Spearman Rank Correlation test was used to test the dependence between the CS and ST results.
Results: The highest CS values were obtained for materials EF, GL9, GI and KM (p>0.05). The lowest CS values were registered for IM, VF, MG and B (p>0.05). The other materials presented intermediate values. The highest ST was found for GL2 and the lowest was for B (p<0.05). The Spearman Correlation test found ST correlating positively with CS (rho = 0.57), except for VF that has a long ST value but is a very weak material, and KM that is a strong material but has a short ST value.
Conclusions: GICs with longer chemical bonds stabilization times are generally stronger, and the ST value obtained from FTIR is useful in predicting the strength of the majority of GICs tested.