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In the characteristics of occlusion, primary dentition laid the foundation for proper eruption and alignment of the succeeding permanent dentition. The prevalence of occlusal traits varies among different ethnic group. To determine the characteristics of occlusion in deciduous dentition of Bamar preschool children, intraoral examination was performed in 323 Bamar preschool children (3 to 5 years old) in Mandalay Region. Frequency distribution of physiologic spaces, anthropoid spaces, primary canine relationship and terminal molar relationship were observed and analyzed by using SPSS software (version 22). This study was cross sectional analytical study and it was found that physiologic spaces were more common in upper arch (56.7%) than in lower arch (34.4%). Anthropoid spaces were more common in upper arch (75.5%) than in lower arch (27.9%). Mesial step molar relationship was most common (71.8%) followed by flush terminal molar relationship (24.8%) and distal molar relationship (3.4%).Significant association was found between type of spacing and terminal molar relationship.
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