K.  Salem, B.  Mirzaee, 
    Infraocclusion of Primary Molars and Associated Dental Anomalies,
    Research Journal of Biological Sciences,
    Volume 4,Issue 12,
    2009,
    Pages 1217-1220,
    ISSN 1815-8846,
    rjbsci.2009.1217.1220,
    (https://makhillpublications.co/view-article.php?doi=rjbsci.2009.1217.1220)
    Abstract: The purpose of present study was to investigate the prevalence of primary molar's ankylosis and associated dental anomalies in a group of Iranian children. After gaining parental consent, periapical radiographs were taken among those with ankylosis to determine missing premolars. During next two years a follow-up examination with the aid pantomograms took place to determine other clinical anomalies in permanent dentition. The prevalence of ankylosis was 15% (13.4% in males, 16.6% in females). More than 60% had more than one ankylosis tooth. The most common ankylosis tooth was the lower first primary molar. Missing was observed among 3 of ankylosed subjects, however none of the controls showed missing premolars. Other observed anomalies consisted of: hypoplastic defects on central incisors (5 vs. 2), macrodontia of upper incisors (3 vs 1), ectopic eruption of upper canines (23 vs. 5) . The Radiographic examination confirmed ankylosis in 10.03% of cases. Annual follow up during the next two years showed spontaneous mobility or exfoliation in 98% of first primary molars. The chi-square test was used for analysis.
    Keywords: missing;aplasia;Dental ankylosis;ectopic eruption;prevalence;macrodontia