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Abstract
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. Te records of 2095 individuals of both sexes with no syndromic pathology were analyzed. Te data were obtained from panoramic radiographies. Te following elements were measured: second molar angle in relation to the occlusal plane, distal invasion of the frst molar and distance between the frst molar and the front edge of the ramus. Results. Te mean age of the individuals studied was 10. It was observed that 1.43 % presented MM2 retention probability (n=30) on average. Te MM2 angle plane was 27° (left side) and 26° (right side). Te invasion of MM2 in distal face of frst molar was 1.5 mm on average. Te angle between the occlusal plane and MM2 was 123°. Te distance between the distal face of the frst molar and the front edge of the ramus was 13 mm. Conclusions. Te prevalence of MM2 risk of impaction is low. Te invasion of the distal face of the frst molar is more frequent in patients with risk of impaction.