Dissolution rate studies were conducted with hydroxyapatite and enamel in the presence of adsorbed surfactants. In general, the ability of the surfactant to retard the dissolution rate was directly related to its ability to adsorb onto apatite. Cetylpyridinium chloride adsorbed poorly onto apatite, and its influence on the dissolution rate was marginal. The long-chain protonated amines were much more effective as rate retarding agents, sometimes of the order of 1,000-, to 10,000-fold. These compounds were also found to adsorb much more strongly. A systematic dependence of the dissolution rate on chain length was found for these amines.
Get full access to this article
View all access options for this article.
References
1.
Meckel, A.H. : The Formation and Properties of Organic Films on Teeth, Arch Oral Biol10:585-597, 1965.
2.
Manly, R.S., and Manly, K.F.: Influence of Cephalin on Solution Rate of Tooth Enamel, J Dent Res42:565-567, 1963.
3.
Myers, H.M.: Effect of Alizarin on Calcium Release from Apatite, J Dent Res42: 1547, 1963.
4.
Green, R.W., and Walsh, J.P.: The Protection of the Wet Enamel Surface by Adsorbed Films, J Dent Res30:218-224, 1951.
5.
Irwin, M.; Leaver, A.G.; and Walsh, J.P.: Further Studies on the Influence of Surface Active Agents on Decalcification of the Enamel Surface, J Dent Res36 :166-172, 1957.
6.
Tonzetich, J.; Bouchal, A.W.; King, W.J.; and Richter, V.J.: The Effect of Temperature on Powdered Enamel Solubility Reduction by Sodium N-Palmitoyl Sarcosinate, Alabama J Med Sci1:268-271, 1964.
7.
Pearce, E.I.F. , and Bibby, B.G.: Protein Adsorption on Bovine Enamel, Arch Oral Biol11:329-336, 1966.
8.
Pearce, E.I.F. , and Bibby, B.G.: Effects of Time, Surface Area, pH, and Some Ions on Protein Adsorption, Arch Oral Biol11:825-832, 1966.
9.
Grenby, T.H. : Phytates in Decalcification Tests In Vitro , Arch Oral Biol12:531-537, 1967.
10.
Ino, T. ; KoNDo, T.; Meguro , K.; and YoDA , I.: Interaction between Fluorescence Indicators and Surface Active Agents, Bull Chem Soc Japan76:220-222, 1955.
11.
Gee, A.; Domingues, L.P.; and Deitz, V.R.: Determination of Inorganic Constituents in Sucrose Solutions, Anal Chem26: 1487-1491, 1954 .
12.
Langmuir, I. : The Adsorption of Gases on Plane Surfaces of Glass, Mica, and Platinum, J Amer Chem Soc40:1361-1402, 1918 .
13.
West, W.; Carroll, B.H.; and Whitcomb, D.H.: The Adsorption of Sensitizing Dyes in Photographic Emulsions, J Phys Chem56:1054-1067, 1952 .
14.
Adam, N.K.: The Physics and Chemistry of Surfaces, London: Oxford University Press, 1941, p 51.
15.
Roseman, T.J.: The Mechanism of Action of Interfacially Adsorbed Agents on the Demineralization Rate of Enamel: PhD Thesis, The University of Michigan , 1967.
16.
Higuchi, W.I. ; Gray, J.A.; Hefferren , J.J.; and Patel, P.R.: Mechanisms of Enamel Dissolution in Acid Buffers, J Dent Res44:330-341, 1965.
17.
Traube, J.: Uber die Capillaritätsconstanten Organischer Stoffe in Wasserigen Losungen , Leibigs Ann265:27-55, 1891.
18.
Lamer, V.K.: Retardation of Evaporation by Monolayers, New York : Academic Press, 1962, pp 9-33 and 59-66.
