IADR Abstract Archives
Polymerization Shrinkage Stress of Novel Light Curing Dental Composites
Objectives: To compare mechanical properties related to polymerization shrinkage of novel light curing dental composites.
Methods: Five commercially available flowable composites, SDR Flow + Bulk Fill (Dentsply Sirona), Omnichroma Flow Bulk (Tokuyama), 3M Filtek Bulkfill Flowable Restorative (Solventum), Gradia Direct Flo (GC), and Activa Bioactive Bulk Flow (Pulpdent), along with two experimental composite, were evaluated. The silica rods surfaces were polished with 70 micron diamond grinding disk and treated with 3M Scotchbond Universal Plus adhesive (Solventum). Composite resin cylinders (1.5xΦ5mm) were built between two fused silica rods connected to the 100 N load cell of a Universal Mechanical Tester (Instron 5566A). After relaxation for 1 min, the composites cylinders were cured using a Demi Plus (Kerr) light curing unit, The polymerization-induced retraction force was recorded by Bluehill Universal software for 320 seconds. The shrinkage stress and shrinkage stress rate were calculated. The peak shrinkage stress, maximum shrinkage stress rate, and time to reach maximum shrinkage stress rate were obtained. Five tests were repeated for each composite. Statistical analysis was performed using one-way ANOVA (α=0.05) with JMP Pro software.
Results: The peak shrinkage stress, maximum shrinkage stress rate, and time to reach the maximum shrinkage stress rate are presented in the table.
Conclusions: 3M Filtek Bulkfill Flowable Restorative exhibited the shortest time to reach maximum stress rate and the highest shrinkage stress rate. SDR Flow + Bulk Fill demonstrated the lowest shrinkage stress among the tested materials. Activa Bioactive Bulk Flow and SDR Flow + Bulk Fill showed the lowest maximum stress rate.
Methods: Five commercially available flowable composites, SDR Flow + Bulk Fill (Dentsply Sirona), Omnichroma Flow Bulk (Tokuyama), 3M Filtek Bulkfill Flowable Restorative (Solventum), Gradia Direct Flo (GC), and Activa Bioactive Bulk Flow (Pulpdent), along with two experimental composite, were evaluated. The silica rods surfaces were polished with 70 micron diamond grinding disk and treated with 3M Scotchbond Universal Plus adhesive (Solventum). Composite resin cylinders (1.5xΦ5mm) were built between two fused silica rods connected to the 100 N load cell of a Universal Mechanical Tester (Instron 5566A). After relaxation for 1 min, the composites cylinders were cured using a Demi Plus (Kerr) light curing unit, The polymerization-induced retraction force was recorded by Bluehill Universal software for 320 seconds. The shrinkage stress and shrinkage stress rate were calculated. The peak shrinkage stress, maximum shrinkage stress rate, and time to reach maximum shrinkage stress rate were obtained. Five tests were repeated for each composite. Statistical analysis was performed using one-way ANOVA (α=0.05) with JMP Pro software.
Results: The peak shrinkage stress, maximum shrinkage stress rate, and time to reach the maximum shrinkage stress rate are presented in the table.
Conclusions: 3M Filtek Bulkfill Flowable Restorative exhibited the shortest time to reach maximum stress rate and the highest shrinkage stress rate. SDR Flow + Bulk Fill demonstrated the lowest shrinkage stress among the tested materials. Activa Bioactive Bulk Flow and SDR Flow + Bulk Fill showed the lowest maximum stress rate.