title: Neutron activation analysis of microleakage around a hydrophobic composite restorative.
abstract: Neutron activation analysis with dysprosium as a tracer was employed to determine quantitatively the microleakage around the restorations of an experimental hydrophobic composite, as well as a commercial composite. Only a negligible uptake of tracer was obtained for the experimental composite, whereas a five-fold uptake was recorded for the commercial composite. Capillary penetration of fluid around a restoration could be greatly reduced by using a hydrophobic composite.
mesh_terms: D000042:Absorption; D000180:Acrylic Resins; D003188:Composite Resins; D001840:Dental Bonding; D005069:Evaluation Studies as Topic; D006801:Humans; D009501:Neutron Activation Analysis; D011109:Polymethacrylic Acids; D013499:Surface Properties; D014867:Water
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D011109:Polymethacrylic Acids; D014867:Water; C026577:octafluoropentyl methacrylate polymer