The aim of this study was to describe occlusion characteristics of primary dentition by age in a sample of Saudi children aged 3–5 years. By using standardized and validated recording criteria, a single operator measured (the primary molar and canine relationships, overjet, overbite, anterior open bite, and anterior and/or posterior crossbites), in 323 Kindergarten children (49.7% boys and 50.3% girls). Descriptive and comparative (Chi-square, t-test) statistics, were used to investigate the occlusal relationship by age of the children. In terms of the molar relationship; flush terminal plane was present in 75% of the children followed by mesial step (13.9%) and distal step (11.1%). The canine relationship was Class I in 90.1% of the sample, followed by Class III (7.4%), and Class II (2.5%) relationship. Fifty seven percent of the children had normal overbite, with significantly higher percentage in older children. Open bite tendency was greater in younger children. Fifty two percen...
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