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Rev. odontol. Univ. Cid. Sao Paulo ; 21(3)set.-dez. 2009. graf
Article in Portuguese | LILACS-Express | LILACS | ID: lil-553619

ABSTRACT

Objective ? This study aims to evaluate the epidemiological characteristics of a sample of patients with agenesis of second premolars, as well as to investigate its association with agenesis of other permanent teeth. Material and methods ? A Brazilian sample of 203 patients aged from 8 to 22 years was selected, all patients presenting agenesis of at least 1 second premolar. Patient age, gender and ethnicity were recorded, as well as the history of extraction of permanent teeth and associated agenesis of other permanent teeth. Results: ? Most individuals presenting second premolar agenesis were female (66%), a sex ratio of 2F: 1M. The frequency of second premolar agenesis was higher in the mandible (61.5%) than in the maxilla (16.7%), while 21.6% of the patients showed second premolar agenesis affecting both arches. The prevalence of unilateral and bilateral agenesis was similar (50%) in the maxilla, while in the mandible 60% of the sample exhibited unilateral agenesis. The mandibular left hemi arch was the most frequently affected. Most of the patients (45.3%) had agenesis of just 1 second premolar. There was a high prevalence of agenesis of other permanent teeth associated with second premolar agenesis, especially of maxillary lateral incisors (16%) and third molars (48%). Conclusion: Agenesis of second premolars was more prevalent in females and at the left side of the mandibular arch and was often associated with agenesis of other permanent teeth.


Objetivo ? O presente trabalho visa avaliar as características epidemiológicas de uma amostra de pacientes com agenesia de segundos pré-molares, assim como verificar a sua associação com a agenesia de outros dentes permanentes. Material e métodos ? Foi avaliada a documentação ortodôntica de 203 pacientes brasileiros com idade entre 8 e 22 anos, apresentando agenesia de pelo menos um segundo pré-molar. Foi feito o registrado de: idade do paciente, sexo e etnia, histórico de extrações de dentes permanentes e presença de agenesias de outros dentes permanentes associadas. Resultados ? A maior parte da amostra era composta pelo sexo feminino (66%), apresentando oddes ratio de 2F: 1M. A agenesia de segundo pré-molar mostrouse mais prevalente no arco inferior (61,5%) do que no superior (16,7%), enquanto que 21,6% mostraram a referida agenesia em ambos os arcos. Os valores percentuais obtidos para agenesia tanto unilateral quanto bilateral foram semelhantes (50%) no arco dentário superior, enquanto que, no arco dentário inferior, 60% da amostra apresentaram agenesia unilateral. A maioria dos pacientes (45,3%) apresentou agenesia de apenas 1 segundo pré-molar. Observou-se uma alta prevalência de agenesia de outros dentes permanentes associada à agenesia de segundos pré-molares, principalmente dos incisivos laterais superiores (16%) e dos terceiros molares (48%). Conclusão: A agenesia dos segundos pré-molares foi mais prevalente no sexo feminino, no arco inferior do lado esquerdo e mostrou-se frequentemente associada a outras agenesias de dentes permanentes.

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