Prevalence of teeth number anomalies in orthodontic patients.

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The purpose of this study was to determine if the prevalence of teeth number anomalies (TNA ) is more frequent in orthodontic patients than in common population and what is TNA clinical manifestation .The records of 824 orthodontic patients (average age 15 .22 years ) from Orthodontic Clinic of Lithuanian University of Health Sciences were analyzed . The radiographs were analyzed by trained observer who followed a pre-established protocol : general observation of the teeth including third molar , followed by a systematic analysis of the erupted and unerupted teeth number in each quadrant . Descriptive statistics were performed for the study variables . A chi -square test was used to determine the difference in the prevalence of hypodontia between the genders . A value of P <0 .05 was considered significant .The prevalence of hypodontia was 17 .11 percent with no statistically significant difference between the genders (P >0 .05 ). More frequently teeth were missing in the lower jaw : in the upper jaw - 10 .3 %, in the lower - 12 .5 % without statisticaly significant diference . Unilateral occurrence of dental agenesis was 1 .5 times more common than bilateral occurrence . If more than one tooth was missing , usually other missing tooth was in the same group and in the same jaw . The upper and lower third molars were the most frequently missing teeth , followed by the mandibular second premolar . The prevalence of hyperdontia was 0 .85 percent . Mesiodens was the most frequently found supernumerary tooth .It was found , that 17 .96 % of orthodontic patients had teeth number anomalies . The upper and lower third molars were the most frequently missing teeth , followed by the mandibular second premolar . Hypodontia occurred more frequently than hyperdontia . Mesiodens was the most frequently found supernumerary tooth . The results confirm that TNA are more often found in orthodontic patients and these patients should be treated with multidisciplinary approach .