3111 The Effect of Ozone Application on Fissure Caries QLF Readings
L. ABU-NABA'A, H. AL SHORMAN, and E. LYNCH, Queens University Belfast, United Kingdom

Fissure caries is a problem to diagnose and treat. Ozone (O3) has been proven to clinically reverse root caries and affect its quantitative light-induced fluorescence (QLF) readings. O3 is proposed as a novel pharmaceutical approach to manage fissure caries. Objectives: to correlate QLF readings with a clinical and histological classification of fissure caries, and then to study the effect of Ozone application on these readings. Methods: A total of 200 QLF (DIAGNOdent®, KaVo Germany) readings were recorded on extracted teeth and correlated with a clinical and histological classification of fissure caries (Ekstrand, 1998). The readings were repeated after cleaning the occlusal fissures of the teeth with the Prophyflex 2® (KaVo Germany) air-powder abrasive prophylaxis system. Another 42 readings were recorded on freshly extracted teeth before, after using the cleaning system, after O3 application using a sealed cup via a hand piece (HealOzone unit, CurOzone USA) for 10s and then after another sequential 10s O3 application. Results: QLF readings correlated significantly with the clinical classification (rs=0.72, p < 0.01) and both correlated with the histological classification (rs=0.61 and 0.624, p < 0.01 respectively). The cleaning system increased the QLF readings correlation with the clinical and histological classifications (rs=0.79 and 0.70, p < 0.01 respectively) and improved the correlation of the clinical classification with the histological classification (rs=0.67, p < 0.01). Ozone application further reduced the QLF readings significantly ((10s) p < 0.047, and (20s) p < 0.002). Conclusion: The application of Ozone has an immediate effect on QLF readings and this reduction increases by doubling the application time. Cleaning the teeth using the air-powder abrasive prophylaxis system improved the yield of clinical diagnosis and QLF readings. The clinical classification can be used as a valid diagnostic measure.

Seq #284 - Dentin Caries, Diagnosis
9:00 AM-11:00 AM, Saturday, 9 March 2002 San Diego Convention Center Room 2 (Upper Level)

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