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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

GARCIA-HERNANDEZ, Fernando  and  BELTRAN VARAS, Víctor Javier. Third Molar Agenesis in Native Ethnia from North of Chile: Aymaras. Int. J. Morphol. [online]. 2009, vol.27, n.1, pp.151-158. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022009000100027.

Agenesis is the absence of teeth by genetic alterations, single or as syndrome. Agenesis of third molar is associated to malformations and is considered by diverse authors a consequence of the human evolution (Larmour et al., 2005). The third molars together with second premolars and lateral incisors are the teeth with greater prevalence of agenesis (Fuller & Denehy, 1984). The prevalence varies between 9% and 37% (McNamara & Foley, 2006); Arboleda et al. (2006) indicated a prevalence of 20%. Literature indicate variable percentage, by gender, dental arches, side and tooth, with few articles on original groups of Chile. The population in study consisted in 78 cases, 42 men and 36 women between 18 and 40 years of the ethnic group of aymarás, without extractions of third molar nor orthodontic treatments and without congenital malformations. Hybridism was determined by means of serum technique by blood agglutination and by application of the formula of Bernstein, demonstrated a 51% of indigenous mixture. To each individual a panoramic x-ray was taken to observe presence or absence of third molars. A 21.79% of agenesis was determined, with greater percentage among males. Agenesis lower third molar predominates in the sample and in men; however in women are greater agenesis upper third molar. In addition, agenesis predominates of the left side in both sexes, while in men equal bilateral percentage is verified. Agenesis of two molars predominates in both sexes. Our results be are compared with atácamenos and young people living in Antofagasta and statistical analyses did not show significant differences at the 95% level, and the results and, in general, agree with those in the literature. This research represents a contribution to the anthropology of the north of Chile, but it is not possible to determine ethnic variables considering the small sample in study.

Keywords : Anthropology; Dentistry; Agenesis; Third molar.

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