Surface morphologies of chemically treated hydroxyapatite.

The Unit csity of VMiclhigan ,School of Dentistry, Anne Arbor, Michigan 48109 J Dent Res 58(6):1566-1569, June 1979 Synithetic bytdroxyapatite is often used for simulationi studies of adsorption of Streptoc occus min tans andic other oral bacteria. F ffects of chIemical treatniienitS of l ydro xvapatites on the adsorption of S. mutanis iasve been reported (O'Brien ct al., J Dent Rse Sept 1978; Mclntvre it a., .J IDent Res 57, Special Issue A, 178, 1978). lhe amount of bacterina adsorbedi by a knoxvn xveight of chemically treated hydroxyapatite is influenced by the surface area of the hydroxyapatite powder. A practical imiethod of detecting gross changes in surface area is by examining the surface morphologies of the chemically treated hydroxyapatite powder using scanning electron microscopy. Hydroxyapatite powders* (15 mg) were treated with 0.5 ml of one of the following chemical solutions: 0.2% chlorhexidine gluconatet; 2% dextran (molecular weight 40,000) , 0.2 M Nab§; 0.005 M