Year : 2024

Volume : Volume 16

Issue : Issue 6

Address for correspondence :
Dr. Abhijit Kumar Sadhu
abhijeetkumarsadhugob@gmail.com

Abstract

Background: Induced contact between incisor tooth roots and the alveolar cortical bone can potentially cause external root resorption. In certain patients, the risk of external root resorption from contact between the tooth roots and the incisive canal further limits maxillary incisor mobility. To evaluate incisor position and its relationship to alveolar bone in untreated optimal occlusions and in untreated Class I with bimaxillary protrusion (ClassI Bimax) and ClassIII malocclusions. Materials and Methods: Fifty-seven lateral cephalograms of individuals with naturally occurring optimal occlusions (mean age = 23 years) were used to assess the positions of central incisors and their relationships to alveolar bone. Data were compared to a sample of 65 individuals with untreated Class I Bimax and Class III malocclusions, mean age = 28.85 (7.2) and 29.77 (6.56), respectively. Results: Significant intergroup differences were found for AP jaw relationship, maxillary alveolar bone thickness, mandibular incisor inclination, maxillary incisor root distance to labial surface of alveolar bone, and mandibular incisor root apex distance to labial surface of alveolar bone. Conclusion: In untreated individuals, maxillary central incisors tend to occupy the anterior one-third of the maxillary alveolar process in Class III malocclusion. In untreated individuals with Class III malocclusions, mandibular central incisors are more negatively inclined and their root apices are more anterior than in those with untreated optimal occlusions. In untreated individuals with Class III malocclusions, maxillary central incisors are more positively inclined and midpoints of their roots are more anterior than in those with untreated optimal occlusions.