IADR Abstract Archives
Detection of Nanoparticles in Wastewater after Grinding of Composites
Objectives: The aim of the present study was to evaluate the release of nanoparticles in wastewater after grinding of composite materials.
Methods: Four composite materials were used: an Ormocer Ceram XTM (Dentsply DeTrey), a nanohybrid: FiltekTM Supreme XTE (3M ESPE), a microhybrid: FiltekTM Silorane (3M ESPE) and a core built-up: CoreX Flow (Dentsply DeTrey). From each composite, 10 samples (5x2mm) were prepared and polymerized according to the manufacturers’ instructions. Each composite sample was ground under standardized conditions (dental bur: 106µm grid, 90 sec, 200.000 U/min). The experiment was performed in an isolated dental unit and the wastewater of each sample was collected after drilling. As control, clean wastewater was collected under the same conditions. The sediment of the gained solution was used for the experiment. The particle size distribution was determined using the Nano Tracking Analysis (NTA) (<1000nm) and Dynamic Light Scattering (DLS) (0.3 nm-10 µm). The eluted particles were identified by elemental analysis (EDX) coupled with ICP-MS.
Results: The amount of the detected particles was similar for all composite materials (p>0.05). The hydrodynamic particle size varied in the range of 110 to 204 nm. The release of particles <100nm and for the range 50-200nm was significantly different among the composite materials (p<0.05). The elemental analysis of the detected particles showed different results among the tested materials. The detected elements such as Al, Ba, Si and Zr correlated to the composition of the composite materials.
Conclusions: Nanoscale particles were detected in wastewater after drilling of composite materials. The quality of the detected particles and the particle size distribution was shown to be material dependent.
Methods: Four composite materials were used: an Ormocer Ceram XTM (Dentsply DeTrey), a nanohybrid: FiltekTM Supreme XTE (3M ESPE), a microhybrid: FiltekTM Silorane (3M ESPE) and a core built-up: CoreX Flow (Dentsply DeTrey). From each composite, 10 samples (5x2mm) were prepared and polymerized according to the manufacturers’ instructions. Each composite sample was ground under standardized conditions (dental bur: 106µm grid, 90 sec, 200.000 U/min). The experiment was performed in an isolated dental unit and the wastewater of each sample was collected after drilling. As control, clean wastewater was collected under the same conditions. The sediment of the gained solution was used for the experiment. The particle size distribution was determined using the Nano Tracking Analysis (NTA) (<1000nm) and Dynamic Light Scattering (DLS) (0.3 nm-10 µm). The eluted particles were identified by elemental analysis (EDX) coupled with ICP-MS.
Results: The amount of the detected particles was similar for all composite materials (p>0.05). The hydrodynamic particle size varied in the range of 110 to 204 nm. The release of particles <100nm and for the range 50-200nm was significantly different among the composite materials (p<0.05). The elemental analysis of the detected particles showed different results among the tested materials. The detected elements such as Al, Ba, Si and Zr correlated to the composition of the composite materials.
Conclusions: Nanoscale particles were detected in wastewater after drilling of composite materials. The quality of the detected particles and the particle size distribution was shown to be material dependent.