INTRODUCTION: The aim of this study was to compare the pattern and prevalence of associated @entity4500 between maxillary and mandibular tooth agenesis ( @entity2651 ). METHODS: A sample of 3315 dental @entity1 , aged 8.6 to 25.4  years, was surveyed for tooth agenesis (excluding third molars): 106 subjects were diagnosed with @entity2651 (group 1) and 70 with mandibular @entity2651 (group 2). Both groups were examined for the following @entity4500 : retained deciduous molars, infraocclusion of deciduous molars, impaction, @entity20692 of maxillary lateral incisors, supernumerary teeth, transposition, transmigration, and ectopic eruption of the permanent molars. For statistical testing, the chi-square test (P  <0.05) was used to compare the occurrences of these anomalies among the groups. RESULTS: We found that 77.5% of the @entity1 in the mandibular @entity2651 group had at least 1 dental @entity154 compared with 49.5% in the @entity2651 group (P  <0.0001). The @entity4500 with a significantly increased prevalence in the @entity2651 group compared with the mandibular @entity2651 group was @entity20692 of the maxillary lateral incisors (groups 1, 46.7%; group 2, 12.9%; P  <0.0001). On the other hand, the prevalences of retained deciduous molars (group 1, 9.4%; group 2, 60.0%), infraoccluded deciduous molars (group 1, 0.9%; group 2, 7.1%), and impacted teeth (group 1, 22.6%; group 2, 38.6%) were significantly higher in the mandibular @entity2651 group. The prevalences of supernumerary teeth, transposition, transmigration, and ectopic eruption of permanent molars were low and not significantly different between the groups. CONCLUSIONS: Tooth agenesis isolated to the maxilla is frequently associated with @entity20692 of the maxillary lateral incisors, whereas tooth agenesis isolated to the mandible is frequently associated with retained deciduous molars, infraoccluded deciduous molars, and impacted teeth. The results of this study may provide additional evidence supporting the field-specific genetic control theory for dental development in both jaws.

Prevalence and distribution of XXXX : A comparison between maxillary and mandibular tooth agenesis.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity154 :: ('MESH:D000013', 'Disease') :: ['anomaly'] @entity2651 :: ('MESH:D000848', 'Disease') :: ['hypodontia', 'maxillary hypodontia'] @entity4500 :: ('MESH:D014071', 'Disease') :: ['dental anomalies', 'only dental anomaly'] @entity20692 :: ('MESH:C538240', 'Disease') :: ['microdontia']
@entity4500 :: (MESH:D014071,Disease) :: ['dental anomalies']
