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Objective: Assessment of anterior crossbite correction on the quality of life of children between 8-10 years using the Child Perceptions Questionnaire (CPQ8-10). Methods: Seventy children, 8-10 years, seeking treatment for anterior dental crossbite, were selected for this clinical study. The impact of early interceptive orthodontic treatment of anterior dental crossbite on the children’s oral health related quality of life (OHRQoL) was evaluated using the Brazilian version of the Child Perceptions Questionnaire (CPQ8-10), in two different points in time: T0: Before treatment of anterior dental crossbite and T1: After correction of anterior crossbite. Results: The overall score of the CPQ8-10 and the scores of each health domain (subscale) of the children of both sexes decreased significantly after final treatment (p<0.001). For the overall score and all heath domains (subscales) except emotional wellbeing subscale, there was no significant difference between the scores of both genders (p>0.05). At the first appointment, females had a significantly higher score of emotional wellbeing than males (p<0.001). Conclusion: Early interceptive orthodontic treatment of children with anterior dental crossbite is essential to improve their OHRQoL. (3250) Sherine Badawy and Adel Rashid E.D.J. Vol. 65, No. 4 positioned lingually in relation to the mandibular anterior teeth.(5) The incidence of anterior crossbite reported in the literature worldwide depending on the age of the child, ethnic group, and methods of registration ranges from 0.5% to 11.9%. (5,6,7,8) Anterior crossbite could be dental, skeletal, or functional. Etiological factors include trauma, supernumerary teeth, crowding, lip biting, presence of odontomas, over-retained, and necrotic or delayed exfoliation of the primary incisors.(9,10) Since it is seldom self-corrected, it should be treated as soon as possible,(5) otherwise it could develop into a more severe malocclusion or cause traumatic injury to the periodontal tissues or temporo-mandibular joint (TMJ).(8,11) Several treatment options such as; removable and/or fixed appliances, which act directly on the malpositioned teeth have been advised for early interceptive treatment of anterior crossbites.(12) Moreover, anterior crossbite is associated with higher levels of dissatisfaction with appearance and may cause a negative impact on oral healthrelated quality of life (OHRQoL) of children.(13) Several methods of assessing the OHRQoL of children are available such as Child Perceptions Questionnaire (4&14), Child-Oral Impacts on Daily Performance (Child-OIDP) (15), Early Childhood Oral Health Impact Scale (ECOHIS) (16), and Child Oral Health Quality of Life Questionnaire (COHQoL) (17). The Child Perceptions Questionnaire CPQ, assesses the children’s perceptions regarding the impact of oral health on quality of life. There are three versions of the CPQ, one for each specific age groups: 6-7, 8-10 and 11-14 years.4,14&18 Therefore, the aim of this study was to assess the impact of early interceptive orthodontic treatment in the mixed dentition stage to correct the anterior dental crossbite on the quality of life of children between 8 -10 years using the Brazilian version of the Child Perceptions Questionnaire (CPQ8-10).19 SUBJECTS AND METHODS

Effect of Anterior Crossbite Correction on The Quality of life for a Group of Egyptian Children During Mixed Dentition Stage