Pravara Med Rev 2019;11(2) 31 . Comparative Evaluation of Prevalence of incipient white spot lesions in visually impaired children of Delhi NCR regionusing Caries Assessment Spectrum and Treatment (CAST) criteria and International Caries Detection and Assessment System II (ICDAS-II) score criteria Shikha Dogra* ,Anil Gupta ** , Monika Nagpal *** Abstract Introduction : Dental caries is most common disease of childhood. Visually impaired children have limited eye-hand coordina- tion or manual dexterity which is necessary to execute adequate oral hygiene skills such as brushing and flossing, further inability to visualize debris or calculus on the tooth surface also lead to the progression of dental caries and inflammation of periodontium. This white spot lesion areas progress into frank cavitation if the bacterial colony is not timely removed from the tooth surface. This stage of dental caries is reversible and tooth structure can be remineralized to normal enamel, if diagnosed at early stages, Hence efforts can be done in these children to control caries progression. Aim : In this study the Prevalence of incipient white spot lesions in visually impaired children of Delhi NCR region was assessed by comparative analysis of Caries Assessment Spectrum and Treatment (CAST) index and International Caries Detection and Assessment System II (ICDAS-II) score criteria Methodology : Prevalence of dental caries and incipient white spot lesions in 1000 visually impaired children of 12 years of age from different blind schools of Delhi NCR region were assessed using Caries Assessment Spectrum and Treatment (CAST) and International Caries Detection and Assessment System II (ICDAS-II) score criteria and obtained data was analysed statistically. Results : Prevalence of incipient white spot lesions in visually impaired children of Delhi NCR region was found to be 54.57 % with CAST index whereas according to ICDAS-II index code 1 Prevalence was 48.07% and according to Code 2 Preva- lence was found to be 53.06% Conclusion : This study concluded that CAST index described disease distribution very well and identified lesion severities and preventive or curative needs in examined population and it requires visual assessment without use of compressed air to dry tooth surface in epidemiological survey which is easy to use. Key words : Visually impaired children, Caries Assessment Spectrum and Treatment (CAST) index, International Caries Detec- tion and Assessment System II (ICDAS-II) score criteria, incipient white spot lesions, Remineralization, *Senior lecturer, **Dean,Prof & HOD, ***PG student Corresponding author: Shikha Dogra Senior lecturer ,Department of Pedodontics and Preventive Dentistry,SGT University,Gurgaon). shikha.dogra87@gmail.com, 9205716200 Original Article Introduction Dental caries is a multifactorial disease which affects the tooth decay by imbalancing equilibrium between demineralization and remineralization process around the tooth surface. If demineralization phase continues, initial loss of minerals occur from interprismatic enamel which appears as initial white spots on tooth surface to naked eye called as incipient caries. Reduced frequency of intake refined sugars can prevent biofilm formation, remineralization with fluoride and other remineralizing agents limits the rate of progression of these incipient caries as these incipient white spot lesions are reversible which can be remineralized with remineralizing agents. [1-10] The prevalence of these incipient white spot lesions could be comparatively high in visually impaired children due to inability to maintain oral hygiene as well as problems in accessing dental care. One of the primary cause of these lesions is inability to visualize the plaque on tooth surfaces. Moreover, lack of manual- visual coordination or parental/caretaker’s supervision and the child’s reduced concern for his/her appearance increases the risk of dental caries in these special children. [11-20] For application of any preventive or therapeutic measure regarding caries control ,dentist should have an actual picture of prevalence of dental caries in that particular region, which can