Resumen

SANDOVAL VIDAL, Paulo  y  BIZCAR MERCADO, Betty. Retention probability of permanent mandibular second molars (Pilot study). Odontoestomatología [online]. 2014, vol.16, n.24, pp.39-44. ISSN 1688-9339.

Objectives. To determine the frequency of risk of impaction of the permanent mandibular second molar (MM2) in a population of orthodontics patients in Temuco, Chile. Method. We conducted a cross-sectional study with a convenience sample. The records of 2095 individuals of both sexes with no syndromic pathology were analyzed. The data were obtained from panoramic radiographies. The following elements were measured: second molar angle in relation to the occlusal plane, distal invasion of the first molar and distance between the first molar and the front edge of the ramus. Results. The mean age of the individuals studied was 10. It was observed that 1.43 % presented MM2 retention probability (n=30) on average. The MM2 angle plane was 27° (left side) and 26° (right side). The invasion of MM2 in distal face of first molar was 1.5 mm on average. The angle between the occlusal plane and MM2 was 123°. The distance between the distal face of the first molar and the front edge of the ramus was 13 mm. Conclusions. The prevalence of MM2 risk of impaction is low. The invasion of the distal face of the first molar is more frequent in patients with risk of impaction

Palabras clave : Molar; Impacted tooth; Impacted tooth.

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