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Journal of Dental Research
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Release of Formaldehyde from Dental Composites

H. Øysæd

NIOM-Scandinavian Institute of Dental Materials, Kirkevn. 71B, P.O. Box 70, N-1344 Haslum, Norway

I.E. Ruyter

NIOM-Scandinavian Institute of Dental Materials, Kirkevn. 71B, P.O. Box 70, N-1344 Haslum, Norway

I.J. Sjøvik Kleven

NIOM-Scandinavian Institute of Dental Materials, Kirkevn. 71B, P.O. Box 70, N-1344 Haslum, Norway

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.

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Journal of Dental Research, Vol. 67, No. 10, 1289-1294 (1988)
DOI: 10.1177/00220345880670100901
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