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DURING THE PAST DECADE, the role of oral hygiene procedures in maintaining dental and periodontal health has received increased attention. A number of studies have shown a positive relationship between the frequency of oral hygiene procedures and gingival health status. 1-5 Little information is available, however, on the effects of several years of continuing preventive measures. There is virtually no information available on the optimum frequency for employing preventive treatment measures or for the reinforcing of instruction in oral hygiene procedures.To secure information on how best to treat its personnel, the United States Air Force initiated a study of preventive periodontic technics at the U. S. Air Force Academy in July 1965. Previous papers have reported on the results of the initial examination of participants 6 and their oral health status after one 7 and two years of preventive treatments. 8 This paper reports on the findings of that study over the entire 46-month period. TREATMENT GROUPSFrom the original group of 713 men selected, 470

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A novel noninstrumented technology (ChemTrak AccuMeter) for the quantitative measurement of analytes in biological fluids was reported at the 1990 Oak Ridge Conference (Clin Chem 1990;36:1591-7). This instrument-free technology has been adapted for the quantitative measurement of high-density lipoprotein (HDL). An in situ lipoprotein separation method has been developed and incorporated into the test for HDL determination. The sensitivity of the assay system has been adjusted so that HDL is measured over a clinically significant range of 250 to 1000 mg/L. This compares to a range of 1000 to 4000 mg/L for the total cholesterol in the earlier reported assay. Like the AccuMeter total cholesterol test, the Accumeter HDL test system is self-contained and consolidates blood separation, lipoprotein separation, and specimen measurement into a single step. The test procedure is simple, and the results are accurate.