No abstract

Several studies have assessed the quality of periodontal tissues adjacent to the second molar after extraction of third molars using clinical assessment and radiographs. In clinical practice, the space occupied by these molars is used to perform distalizing movements and tissue integrity is a condition to do it, so it is necessary to evaluate with suitable methods such as digital volume tomography alveolar bone quality, before and after the removal of third molars. The aim of the study was to evaluate through cone beam dimensions the distal alveolar bone of the second molar after third molar extractions in patients undergoing orthodontic treatment. A quasi-experimental study was implemented with a six months follow up in patients with orthodontic treatment that attended the post-graduate clinic of the University of Cartagena. The sample consisted of 128 molars of 32 individuals treated with fi xed appliances. Bone dimensions behaved as follows: height was 3.44 mm T0, T1 of 3.96 mm and 3.44 mm in T2; the thickness was 2.90 mm T0, T1 was 2.79 mm and 3.37 mm T2; T0 width was 15.58 mm, 15.50 mm in T1 and T2 of 15.19 mm. The alveolar process can recover its dimensions after extraction thanks to dental movements generated by orthodontics thus maintaining a stability which results in periodontal health. INTRODUCCIÓNLos terceros molares son las piezas dentales que frecuentemente presentan ausencia congénita e impactación, se encuentran presente en un 90% de la población de la cual por lo menos el 33% presenta un tercer molar impactado, y representan además el 98% de todos los dientes impactados. El tercer molar mandibular presenta una mayor frecuencia de importación y la incidencia varía del 9.5% al 68% en diferentes poblaciones. 1 La difi cultad en la erupción de los terceros molares, en especial de los inferiores, se debe a su formación tardía y a la evolución fi logenética de la Evaluación de las dimensiones del hueso alveolar distal del segundo molar a través de cone-beam post-extracción del tercer molar Evaluation of dimensions of the distal alveolar bone of the second molar by cone beam after extraction of third molars