title: Clinical evaluation of a radiopaque composite restorative material after three and a half years.
mesh_terms: D000328:Adult; D001464:Barium; D002986:Clinical Trials as Topic; D003116:Color; D003188:Composite Resins / Q000592:standards*; D003287:Contrast Media; D003782:Dental Pulp / Q000187:drug effects*; D005069:Evaluation Studies as Topic; D006801:Humans; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; D003287:Contrast Media; D001464:Barium