Thus, variations in maxillary central incisors root angulation/inclination and their relationship with the nasopalatine canal can affect orthodontic movement amplitude. Previous studies have verified that the nasopalatine canal – intraosseous anatomical structure located in the medial region of the palate, posterior and adjacent to the roots of the central incisors, through which nasopalatine vessels and nerves run, ,, , – has been associated with inflammatory root resorption after maximal retraction of the maxillary central incisors, , due to its morphology, since it is surrounded by thick cortical bone, which can induce inflammatory resorption by the contact with the roots,. Previous studies have shown that the angulation between the maxillary central incisor and the nasopalatine canal angulation can affect the range of orthodontic movement amplitude challenging the long-term effectiveness of maximal retraction orthodontic treatment for some patients. Although it is recognized that distal movement of maxillary incisors is limited by the lingual cortical of the alveolar bone, it is crucial to consider that anatomical structures can also restrict teeth movement,. The position of the incisors is one of the critical analysis points of orthodontic planning and treatment due to their relationship with the position of lips and facial aesthetics, especially in patients with maxillary protrusion, ,.
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