X-ray Diffraction Study of Acid-degradable Glasses

Abstract

The composition of the degradable glasses used in commercial dental glass-ionomer cements determines their leaching behavior and hence the properties of the cement. The objective of the present study was to assess if the composition and leaching in acetic acid solutions are reflected in the x-ray diffraction characteristics of these glasses. The position (26) of the maximum of the first sharp diffraction peak shifts to higher diffraction angles with increasing number and ionic radius of mono- and bivalent cations in the glass. Upon acid-leaching, these ions are preferentially leached out, so that (26) decreases. These results can be related to the decreasing Si-Si distance in the glass network with increasing modifier radius.

Keywords

acid-degradable glasses x-ray diffraction glass composition leaching

Get full access to this article

View all access options for this article.

References

De Maeyer Eap , Verbeeck Rmh , Vercruysse Cwj (1998). Reactivity of fluoride-containing calcium aluminosilicate glasses used in dental glass-ionomer cements. J Dent Res 77:2005-2011.

De Maeyer Eap , Verbeeck Rmh , Vercruysse Cwj (1999). Stoichiometry of the leaching process of fluoride-containing aluminosilicate glass-ionomer glasses. J Dent Res 78 :1312-1318.

Eckschlager K. (1969). Errors, measurement and results in chemical analysis . London: Van Nostrand Reinhold Company Ltd., p. 88.

Gottlicher J. , Pentinghaus HJ (1996). Compositional influence on shape and position of the first sharp diffraction peak (FSDP) in silicate and germanate glasses . Ber Bunsenges Phys Chem 100:1563-1568.

Lide DR , editor-in-chief (1993). CRC handbook of chemistry and physics. Boca Raton, FL: CRC Press.

Matsuya S. , Maeda T. , Ohta M. ( 1996). IR and NMR analyses of hardening and maturation of glass-ionomer cement. J Dent Res 75:1920-1927.

Ripley BD , Thompson M. (1987). Regression techniques for the detection of analytical bias. Analyst 112:377-383.

Shelby JE (1997). Introduction to glass science and technology. Cambridge: The Royal Society of Chemistry .

Swenson J. , Borjesson L. (1998). Intermediate range ordering in a network glass . J Non-Cryst Sol 223:223-229.

10.

Taniguchi T. , Okuno M. , Matsumoto T. (1997). X-ray diffraction and EXAFS studies of silicate glasses containing Mg, Ca and Ba atoms. J Non-Cryst Sol 211:56-63.

11.

Warren BE , Krutter H. , Morningstar O. (1936). Fourier analysis of x-ray patterns of vitreous SiO2 and B2O3. JAm Ceram Soc 19:202-206.

12.

Wilson AD , McLean JW (1988). Glass-ionomer cement. Chicago : Quintessence Publishing Co.

13.

Wilson AD , Nicholson JW (1993). Acid-base cements. Cambridge : Cambridge University Press.

14.

Wood D. , Hill R. ( 1991). Glass ceramic approach to controlling the properties of a glass-ionomer bone cement. Biomaterials 12 :164-170.