Prevalence of hypodontia in orthodontic patients in Brasilia, Brazil

Abstract

The purpose of this retrospective study was to determine the prevalence of hypodontia and associated dental anomalies in patients undergoing orthodontic treatment in Brasília, Brazil, over a 2 year period (1998-2000). The records of 1049 orthodontic patients between 10 and 15.7 years of age (507 males and 542 females) from 16 orthodontic clinics were analysed. Descriptive statistics were performed for the study variables. A chi-square test was used to determine the difference in the prevalence of hypodontia between genders. The prevalence of hypodontia was 6.3 per cent (39.4 per cent males and 60.6 per cent females) with no statistically significant difference between the genders. One case of oligodontia was observed. The maxillary lateral incisor was the most frequently missing tooth, followed by the mandibular second premolar. All cases of hypodontia, except one, were associated with at least one other dental anomaly. These associated dental anomalies were retained primary teeth (30.3 per cent), ectopic canine eruption (25.8 per cent), taurodontism (21.2 per cent), and peg-shaped maxillary lateral incisors (16.7 per cent).

Prevalence of hypodontia of permanent dentition in a sample of orthodontic patients In Erbil City: An orthopantomograph study

“…geographic differences. 25,26 Hypodontia was more frequently found in females with no statistical difference, and this is agreeing with several studies, 13,[16][17][18]20,21,27 while Bäckman and Wahlin found significant difference between genders. 28 The higher prevalence of hypodontia in females may be due to biological differences and higher demands to aesthetic by females that make more orthodontic treatment need.…”

“…This finding is near to prevalence of study done in Brazil by Raquel Ribeiro Gomes which is 6.3%. 21 The prevalence of hypodontia in orthodontic patients differs in different ethnic groups and regions in the world. Excluding the third molar, hypodontia ranges from 2.6% in Turkey 22 to 5.5% in Mexico, 8 6.3% in Brazil, 21 8.5% in Japan, 17 11.1% in Korea, 12 14.7% in Hungary 23 to 26.4% in Thais.…”

“…21 The prevalence of hypodontia in orthodontic patients differs in different ethnic groups and regions in the world. Excluding the third molar, hypodontia ranges from 2.6% in Turkey 22 to 5.5% in Mexico, 8 6.3% in Brazil, 21 8.5% in Japan, 17 11.1% in Korea, 12 14.7% in Hungary 23 to 26.4% in Thais. 24 The great range of prevalence for hypodontia observed in different population may be due to Because hypodontia is the most common anomaly in the development of the human dentition, many studies have been conducted on the prevalence of hypodontia in different nations and countries.…”

“…Also due to delayed development of premolars, findings of most frequently missing teeth can also affect the result, and it may be a reason for the higher prevalence of maxillary lateral incisor missing in some studies. 8,11,12,19,[21][22][23]27,30 Also, the missing teeth were more often absent bilaterally. Goya et al, Endo et al, Medina, Sisman et al and Silva Meza also reported that missing teeth are mostly found bilaterally.…”

Association between dental anomalies and malocclusion in Brazilian orthodontic patients

“…Hypodontia, hyperdontia, microdontia, macrodontia, taurodontism, transposition, impaction and ectopia have been reported in orthodontic populations (3,(5)(6)(7)9,12,13). There is no consensus among the various studies regarding the data on prevalence, distribution by gender, age and site of occurrence of the anomalies (5,6,13), highlighting the need for further reports in different populations.…”