Predictability and Reliability of
Different Anterio-Posterior Skeletal Discrepancy Indicators in Different Age Groups - A Cephalometric Study
Published: September 1, 2016 | DOI: https://doi.org/10.7860/JCDR/2016/19195.8560
Rana Tiwari, Tarulatha R Shyagali, Abhishek Gupta, Rishi Joshi, Anil Tiwari, Priyank Sen
1. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
2. Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
3. Reader, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
4. Professor, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
5. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
6. Postgraduate Student, Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
Correspondence
Dr. Tarulatha R Shyagali,
Professor and Head, Department of Orthodontics and Dentofacial Orthopedics,
Hitkarini Dental College and Hospital, Jabalpur-482001, Madhya Pradesh, India.
E-mail: drtarulatha@gmail.com
Introduction: The lateral cephalometric skeletal discrepancy indicators play a major role in diagnosing and preparing a case for orthognathic surgeries and the dentofacial corrections.
Aim: The study was aimed to check the reliability and the predictability of different anterio-posterior skeletal discrepancy indicators in different age groups and to derive the most reliable indicator for the orthodontic diagnosis.
Materials and Methods: A cross-sectional study was conducted on a sample of 100 subjects including 29 adolescent (15 males and 14 females) and 71 adult (41 males and 30 females) subjects with the mean age of 19.05 ± 5.78 years. All the subjects had Angle’s Class I molar relationship. The lateral cephalograms of the sample were taken under the standard setting and hand tracing of the cephalometric radiographs using a sharp 4H pencil were made on acetate tracing paper. The anterio-posterior cephalometric indicators like ß-angle, Wits appraisal (mm), Sella- Nasion plane to Point A and Point B distance (SN-AB mm) and Maxillo-Mandibular plane angle bisector to Point A and Point B distance (MM-AB mm) were measured. Intra-examiner reliability of tracings was evaluated using Intra Class Correlation (ICC) test. Mann Whitney U-test was applied for comparison of parameters between different malocclusion groups. Concurrent validity of various parameters was calculated using Cohen's kappa. A p-value <0.05 was considered statistically significant.
Results: The comparison of intra-examiner reliability of tracings in Angle’s Class I adolescent group showed, MM-AB to have an almost perfect agreement followed by Wits. Intra-examiner reliability of tracings in Angle’s Class I adult group showed moderate agreement for Wits and MM-AB showed almost perfect agreement and all the parameters showed statistically significant ICC. Comparison of parameters between adolescent and adult, Angle’s Class I malocclusion group showed significant difference between adolescent and adult group for the Wits and SN-AB parameter.
Conclusion: The final outcome of the present study revealed that, the MM–AB is highly reliable in the reproducibility and also highly valid parameter for checking antero-posterior discrepancies and ANB angle was least reliable for diagnosing the antero-posterior skeletal discrepancies.
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