DETECTION OF LEACHED MOIETIES FROM DENTAL COMPOSITES IN FLUIDS SIMULATING FOOD AND SALIVA

Citation
Sy. Lee et al., DETECTION OF LEACHED MOIETIES FROM DENTAL COMPOSITES IN FLUIDS SIMULATING FOOD AND SALIVA, Dental materials, 11(5-6), 1995, pp. 348-353
Citations number
33
Categorie Soggetti
Dentistry,Oral Surgery & Medicine
Journal title
ISSN journal
01095641
Volume
11
Issue
5-6
Year of publication
1995
Pages
348 - 353
Database
ISI
SICI code
0109-5641(1995)11:5-6<348:DOLMFD>2.0.ZU;2-L
Abstract
Objectives. The purpose of this study was to analyze the IR spectra of a liquid simulating food and an artificial saliva following exposure to resin composites. Methods. Fourier transform infrared (FTIR) spectr oscopy was used to analyze two solutions in which three commercially a vailable dental composites (Marathon One, Den-Mat Co.; Z100, 3M Co.; H erculite XRV, Kerr Co.) were stored. The solutions used were: a food s imulating fluid, 75 vol% ethanol/water, and an artificial saliva, Moi- Stir (Kingwood Labs., Inc.). Specimens (4.3 mm diam, x 2 mm thick) of the three resin composites were stored at 37 degrees C in 60 mt of eit her Moi-Stir or the 75% ethanol solution for 7, 14, and 30 d. The FTIR spectra were obtained using a liquid sample ATR (attenuated total ref lection) cell. Results. No obvious leachable materials were seen from any of the composite specimens stored in artificial saliva up to 30 d of immersion. For the composites stored in ethanol, the observed spect ra revealed increases in the principal absorption bands for the compon ents of the three composite systems. Methacrylate skeletal vibrations (1015-815 cm(-1)) and -CH3 alkane, C-H asymmetrical deformation vibrat ions (1520-1460 cm(-1)) appeared after 14 d of storage. A very strong peak characteristic of the aliphatic C=C moiety (1640 cm(-1)) and carb onyl C=O (1730 cm(-1)) occurred after 14 d. The peak heights of these two functional bands increased as a function of time and after 30 d of storage were approximately 5-7 times those produced after 7 d. Irregu lar O-H bands (3500-3300 cm(-1)) were also observed after 30 d in etha nol. Significance. Irreversible processes such as the leaching of comp onents occurs in the presence of ethanol. This phenomenon may contribu te to irreversible material degradation.