COMPARATIVE EVALUATION OF COLLUM ANGLE OF MAXILLARY CENTRAL INCISOR IN PATIENTS WITH ANGLES CLASS I, CLASS II DIVISION 1 AND CLASS II DIVISION 2 MALOCCLUSIONS – A CEPHALOMETRIC STUDY

Nivedita Nandeshwar, Sujoy Banerjee, Usha Shenoy, Pankaj Akhare, Ananya Hazarey, Himija Karia, Sangeeta Bhattacharya

Abstract


Background:

Variations in anatomic features of the maxillary central incisors (MCI) can affect either the treatment or the retention phase of orthodontic therapy.

Collum angle (CA) of single rooted teeth is of particular interest to orthodontists as any variation in root angulations leads to unpredictable axial force application in movements such as intrusion and extrusion which cause roots to violate labial/lingual cortical boundaries when being repositioned.

Aim:

Comparative evaluation of (CA) of (MCI) in patients with Angles class I, class II division 1 and class II division 2 malocclusions.

Materials and method:

Sample size of 90 is obtained for the study, divided into 3 groups based on type of malocclusion, with an age ranging from 18-30 years and (CA) of (MCI) in each group is measured by sketching it from lateral cephalogram then superius point (sp) on incisal edge, middle point of (CEJ) and root apex are marked. Long axis of crown is drawn by joining (sp) on incisal edge and middle point of (CEJ) and long axis of root is drawn by joining middle point of (CEJ) and root apex. (CA) is then measured by joining the long axis of root and crown.

Results:

Statistical analysis is performed using SPSS version 22, which showed exceeding values of (CA) of (MCI) in patients with Class II division 2 malocclusion.

 

Conclusion:

The larger (CA) is an etiological factor in the development of a deep bite.

In addition, larger (CA) may limit biomechanical movements during orthodontic treatment.

 


Keywords


Collum angle , malocclusion ,central incisor

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