title: Release of formaldehyde from dental composites.
abstract: Polymeric composite materials may contain releasable degradation products or unreacted constituents. Release of formaldehyde from nine different composites was investigated by means of HCHO-hydrazone derivative analyzed with high-performance liquid chromatography. Formation of formaldehyde was found in all the investigated materials. The highest concentrations were observed in specimens polymerized in contact with air. A correlation coefficient, r = 0.83, was found between released formaldehyde and the thickness of the unpolymerized surface inhibition layer. The formaldehyde concentrations were reduced when the inhibition layer was removed prior to testing. A continuous release of formaldehyde was evident during the first ten days. The release decreased with time, but was still detectable after 115 days.
authors.affiliation: NIOM-Scandinavian Institute of Dental Materials, Haslum, Norway.
authors.forename: H
authors.initials: H
authors.lastname: Oysaed
authors.forename: I E
authors.initials: IE
authors.lastname: Ruyter
authors.forename: I J
authors.initials: IJ
authors.lastname: Sjøvik Kleven
mesh_terms: D002851:Chromatography, High Pressure Liquid; D003188:Composite Resins / Q000032:analysis*; D005557:Formaldehyde / Q000032:analysis*; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D005557:Formaldehyde