INDUCTIVELY COUPLED PLASMA-OPTICAL EMISSION SPECTROSCOPY (ICP-OES) STUDY OF ION RELEASE FROM RAW AND ACID WASHED FLUOROALUMINOSILICATE (GLASS IONOMER) GLASSES: Inductively Coupled Plasma-Optical Emission Spectroscopy

Shahab Ud Din; Saroash Shahid; Gavin Pearson; Elizabeth Tanner; Richard Billington

Authors

Shahab Ud Din Army Medical College, Rawalpindi
Saroash Shahid Armed Forces Institute of Dentistry (AFID
Gavin Pearson Queen Mary University of London
Elizabeth Tanner Queen Mary University of London
Richard Billington Queen Mary University of London

Keywords:

Ion release, glass-ionomer, dental cements

Abstract

Objectives: To measure the release of ions from fluoroaluminosilicate glasses, LG125, into deionised water and to compare the ion release from raw and acid washed glasses, taking account of the effect of acid wash on the ion release.
Design: Randomized Control Trials (RCT)
Place and Duration: Study was conducted at Department of Biomaterials in relation to Dentistry, Queen Mary University of London from Nov 2004 to Jun 2005.
Materials and Methods: Specimens of experimental glasses, LG125 raw and acid washed (aw), were stored in polyethylene (PE) tubes at 37 ºC in deionised water for a storage period of 1 to 28 days. Glass free solutions were collected after 1, 3, 7, 14, 21 and 28 days. The ions released were analyzed by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES). ICP-OES is a very powerful tool for trace metal analysis that uses the phenomenon of atomic and ionic excitation to determine concentration of ions in aqueous solutions.
Results: (a) Ions releases from the glasses were observed at all time intervals. The amounts of ion release were decreased over time and minimal quantities were seen in week four. (b) After acid wash the amount of release of fluoride (F) and aluminum (Al) ions were increased from the glasses while the release of Strontium (Sr) and Calcium (Ca) were decreased. (c) It was also seen that the acid washing enhances the release of F ions more than Al ions. Although the amount of Al was increased after acid wash but the concentration was too lower as compared to F ions.
Conclusions: (a) Under both conditions substantial amounts of ions were released from the glasses but the release of ion were decreased after reaching a peak value. (b) F and Al were released more from aw glasses as compared to raw. (c) Release of Sr and Ca were greater from raw than aw.

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INDUCTIVELY COUPLED PLASMA-OPTICAL EMISSION SPECTROSCOPY (ICP-OES) STUDY OF ION RELEASE FROM RAW AND ACID WASHED FLUOROALUMINOSILICATE (GLASS IONOMER) GLASSES