Aimen Al-Gobrani, Fatma A. Abdel-Sayed, Hoda M. Abdel-Aziz And Manal Y. Fouda,

ABSTRACT
Aim Of Study: The Aim Of This Study Was To Determine The Prevalence Of Malocclusion And Orthodontic Treatment Needs Among Egyptian School Children In Matrouh Governorate In The Arab Republic Of Egypt.

Materials and Methods: Asample Of 500 Children (8-12 Years Of Age ) Were Randomly Selected From Matrouh Governorate Primary Schools. Clinical Examination Were Performed At The School Clinic.The Need For Orthodontic Treatment Was Evaluated According To Index Of Orthodontic Treatment Need (IOTN). Result: Showed That Matrouh Governorate, Accepted Occlusion Represented 13.8% Of The Total Sample Malocclusion Represented 86.2% Of The Total Sample, Were 64.0% Showed Angle Class I, 14.6% Showed Angle Class II, 6.4% Showed Angle Class III, While 1.2% Showed Angle Class IV. There Were Tendency Toward Decrease In Percent Of Accepted Occlusion And Increase In Angle Class II And III Compared To Previous Egyptian Studies There Were No Sex Differences Within All Of The Occlusal Categories Dental Health Component (DHC) Of The Index Of Orthodontic Treatment Need Showed That 15.8% Of The Total Sample Were In Great Need Of Treatment, 20.6% Showed Moderate Need, While 63.6% Showed No Or Little Need For Treatment. Aesthetic Component (AC) Of The Index Of Orthodontic Treatment Need Showed That 7.4% Of The Total Sample Were In Great Need Of Treatment, 37.6% Showed Moderate Need, While 55% Showed No Or Little Need For Treatment.

Conclusions: The Percent Of Children With Great Treatment Need Regarding DHC Were (20.6%) Lower Than In Cairo (23.5%), While Regarding AC Were (7.4%) Higher Than In Mansura (4.4%). There Were No Sex Difference Within DHC And AC Components, There Were No Correlation Between Either Of DHC Or AC Components And Mixed.