| ORIGINAL ARTICLE |
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| Year : 2015 | Volume
: 3
| Issue : 1 | Page : 45-48 |
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Assessing reliability of mandibular planes in determining gonial angle on lateral cephalogram and panoramic radiograph
Thilagarani1, Purnima V Nadkerny2, Danyasi Ashok Kumar1, Vidyesh D Nadkerny1
1 Department of Orthodontics, New Horizon Dental College and Research Institute, Sakri, Bilaspur, Chhattisgarh, India
2 Department of Periodontics, New Horizon Dental College and Research Institute, Sakri, Bilaspur, Chhattisgarh, India
Correspondence Address:
Vidyesh D Nadkerny
Mohini 4-B, Cotto, Sanguem, Goa - 403 704, Maharashtra
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/2321-3825.146358
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Introduction: Gonial angle is used widely in orthodontic tracing and is a significant indicator to diagnose the growth pattern in patients. Lateral cephalograms and panoramic radiographs both effectively determine the gonial angle. A definite variation exists when the gonial angle is determined using three different mandibular planes as described by Tweed, Steiner, and Down, respectively. The aim of this study was to evaluate, which gonial angle (obtained from Tweed's, Steiner's or Down's mandibular plane) on lateral cephalogram has the value closest to that obtained on a panoramic radiograph. Materials and Methods: A total of 300 patients between 12 and 29 years of age were selected. Panoramic and lateral cephalometric radiographs were obtained. On panoramic radiograph, gonial angle was determined by tangent of inferior border of mandible and most distal aspect of ascending ramus and condyle and compared with the value of each gonial angle obtained using three mandibular planes as described by Tweed, Steiner and Downs on lateral cephalogram. Levene's and Independent samples t-test were done for comparison. Results: Difference between gonial angles determined by Tweeds mandibular plane on lateral cephalogram and panoramic radiograph was statistically insignificant (P > 0.05). Conclusion: Of the three commonly used mandibular planes in measuring gonial angles, the value obtained with Tweeds mandibular plane seems to be more reliable. |
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