الفهرس 
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Abstract
The current study was carried out in faculty of dentistry, Alexandria university over a period of one year aiming to evaluate and compare the oral health status of children with cleft lip and/or palate and non -cleft children.152 children participated in the study ;the first group consisted of 76 cleft children recruited from the Cranio-maxillofacial and plastic surgery department, Faculty of Dentistry, Alexandria University and the second group consisted of 76 non-cleft children attending the attending the Pediatric Dental Clinics, Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University.
Data was collected through questionnaire, and clinical examination. Data collected included socio-demographic variables, history of previous dental visits, oral hygiene habits, snacking habits, dietary consistency. Clinical examination was performed under good illumination following standard infection control precautions while using disposable diagnostic sets, such as gloves, a mirror, and an explorer. Intra-oral examination assessed caries experience following World Health Organization (WHO) criteria. The Silness and Loe Plaque Index was used to track oral hygiene, and the Loe and Silness Gingival Index was used to evaluate gingival health. Dental occlusion and developmental dental anomalies were also recorded.
The present study showed that CLP parents had lower educational level than the non-cleft group P=0.011. Dental visits through the previous one year was significantly lower in the cleft lip and/or palate group than the non -cleft group P<0.0001 Regarding brushing habit; Cleft lip and/ or palate children who did tooth brushing were significantly less than non-cleft children P=0.001. No significant difference between the two groups regarding brushing frequency. CLP children had more brushing problems than the non-cleft group P=0.002. It was also shown that CLP children consume more soft food than the non-cleft group P=0.002.
Regarding oral hygiene status in CLP children versus non-cleft children, the CLP group had significantly greater plaque and gingival index scores (P<0.0001). Caries experience (dmft, dft and DMFT) was significantly higher in CLP children than non-cleft children in both primary and mixed dentitions (P=0.033,P=0.047,P=0.001). In the present study CLP children showed significantly higher percentages of class III molar and cuspid relations, posterior crossbite, anterior crossbite and anterior openbite than the non- cleft group P<0.0001. The present study also showed that there was a significant difference between CLP children and non- cleft children regarding developmental dental anomalies with higher presence in CLP group P<0.0001 including hypodontia, supernumerary teeth, conically shaped teeth and enamel defects teeth with the highest percentage to hypodontia.