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Year : 2018  |  Volume : 52  |  Issue : 4  |  Page : 229-237

Reliability of three different alternative points to point “A”

1 Senior Lecturer, Department of Orthodontics and Dentofacial Orthopedics, Institute of Dental Sciences, Bareilly, Uttar Pradesh, India
2 Prof., Department of Orthodontics and Dentofacial Orthopedics, College of Dental Sciences, Davangere, Karnataka, India

Correspondence Address:
Dr. Shivani Singh
Department of Orthodontics and Dentofacial Orthopedics, Institute of Dental Sciences, Bareilly - 243 001, Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jios.jios_251_16

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Introduction: Even after the advent of computed tomography (CT) and cone-beam CT, lateral cephalograms are still the radiograph of choice for routine orthodontic practice for the assessment of growth and treatment changes using cephalometric evaluation, which in turn requires exact identification of anatomic landmarks. However, certain landmarks like point A, are difficult to locate in some cases. Alternative methods have been described in literature to locate point A in such situations. There are only few studies on the reliability of these alternative points and it is not clear whether their use in cephalometric analysis is of any significance. Therefore, the objective of this study was to test the reliability of three alternative points to Point A. Materials and Methods: Lateral cephalograms of seventy patients were selected on the basis of ability to locate point A with considerable degree of accuracy. The sample was divided into two groups: Group I consisted of 35 participants with retroclined upper incisors and Group II, 35 participants with proclined upper incisors. Three alternative methods for point A estimation were evaluated for reliability in vertical and horizontal planes. Results: In both the groups, mean differences between SNA-SNA2 and NA-NA2 was found to be least and correlation coefficient was found to be highest for SNA-SNA2 and NA-NA2. Conclusion: Point A2 is the most reliable alternative to point A in both the groups and in situations where anterior contour of the maxilla is obscured, point A1 can be used as a reliable alternative to point A.

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