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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

BELTRAN VARAS, Víctor Javier; FUENTES FERNANDEZ, Ramón; BUSTOS CORTES, Alejandro  and  SANHUEZA CAMPOS, Antonio. Relationship between Levels of Third Molar Inclusion and Physical Anthropometric Indices of the Mandible in the Atacameño and Aymara Ethnic Groups of Northern Chile. Int. J. Morphol. [online]. 2011, vol.29, n.2, pp.446-454. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022011000200025.

The pathology associated with the formation, development and eruption of third molars is one of the most frequent reasons for dental consults. Several authors agree that the third molar is the most frequent inclusion tooth, there is however, disagreement about the influence of environmental and racial factors that explain this condition. It is known that individuals of one ethnic group have particular physical characteristics, which are also observed at facial level according to characteristics of maxillo-mandibular mass. This prompted research regarding the relationship between levels of third molar inclusion and physical anthropometric indices of the mandible in Atacameño and Aymara ethnic groups in Northern Chile. A sample of 56 patients to determine blood type and Rh factor was established to assess the degree of mixing. An intra-oral clinical examination was also performed to clarify the state of eruption or absence of third molars. Radiographs were taken to determine the inclusion or agenesis if teeth were not visible in the oral cavity, through classification of depth on cementum-enamel boundary of the second molar present. Finally we proceeded to record various measurements of maxillo-facial massif to set the bilateral mandibular ramus and ziggo mandibular indexes in each of the selected individuals. The study compares results with other research and determined in both indigenous populations, the prevalence of third molars (85.72% right, and 83.93% left).

Keywords : Anthropology; Dentistry; Third Molar; Inclusion.

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