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首页> 美国政府科技报告 >Development and Evaluation of a Diagnostic System for the Early Detection of Dental Caries
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Development and Evaluation of a Diagnostic System for the Early Detection of Dental Caries

机译：龋病早期诊断诊断系统的开发与评价

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An instrument was developed which measures the resistance of occlusal sites, printing values up to 30 megohms and buzzing below 5 megohms. Drying air passes continually through the instrument probe tip. In a longitudinal study, two examiners used instrument and conventional (explorer, tactile, and visual) techniques on pediatric patients at six-month intervals. The instrument data correlated well with the explorer. Clinically sound, decalcified, and carious teeth had 65, 1.5, 0.3% of resistance values over 30 megohms, respectively; 31, 61, 17% between 5 and 30 megohms; and 4.4, 38, 82% under 5 megohms. For longitudinal comparisons, the explorer criteria appeared to change with time. The instrument consistently found about 10% of the sites to be below 5 megohms; whereas the conventional (explorer) criteria initially found 5% to be positive, and this rose to 20% later in the study. The instrument agreed with the later positive explorer findings (12 and 18 months later) better than the earlier explorer diagnosis agreed with these later explorer findings. Also, after 12 and 18 months the early instrument reading was a better predictor of restorations. Interproximal caries were measurable, provided the instrument tip could contact the carious area. In a preliminary study, APF treatment was shown to initally decrease (1 hour) and later increase (1 day, 1 week) enamel resistance. In in vitro studies the precision of resistance measurements was about plus or minus 25%. Several seconds are needed to reach an equilibrium value on carious sites. Using an electrometer, in vitro measurements on smooth surfaces were used to evaluate the effect of enamel thickness, decalcification, and fluoridation procedures. Lactate buffer significantly decreased enamel resistance. Both NaF and APF treatments of decalcified sections significantly increased the enamel resistance. Enamel near the surface is less permeable than that nearer the dentinal junction.

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