0239 The assessment of efficiency of the Opalescence 10% bleaching system

E. JODKOWSKA, and K. MALKIEWICZ, Medical University of Warsaw, Poland

Objectives: The main purpose of this clinical trial was to determine the tooth whitening effect of the Opalescence 10% bleaching system (Ultradent) based on 10% carbamide peroxide.

Methods: A total of 19 adults were examined. They used the Opalescence 10% bleaching gel for 2 hours, once a day over 14 days, placed in individual trays. The change of L*a*b* colour parameters was assessed by use of a digital camera – Shadeanalyzer, designed for evaluating tooth colour. A series of pictures of the central incisors was taken for each patient. The first picture was taken before bleaching, the second after seven days and the third after 14 days of treatment. Pictures were analyzed by the use of Shade Analyzer software to reveal the L*a*b* values. Each image was analyzed twice, and the mean L*a*b* value was taken for statistical analysis. Results: An analysis of the data revealed a significant change in the color of bleached teeth. The results show an improvement of 1-2 shades on the shade guide (Vita). The mean value of L* (lightness) increased from 82,49 to 84,18 after 7 days and to 84.45 after 14 days. The mean value of b* (yellowness) decreased from 7,74 to 7,10 after 7 days and to 6,59 after 14 days.

Conclusion: 1.The findings suggest that the Opalescence 10% bleaching system can be considered as an effective method of teeth bleaching. 2.Digital photography seems to be a proper method of the objective and repeatable color analysis. Seq #23 - Dental Materials posters (see subtitles) 11:00 AM-12:30 PM, Friday, 16 September 2005 RAI Congress Center Lounge Upper Floor - 1