CORRELATION BETWEEN MAXILLARY ARCH PERIMETER OF PRE AND POST ORTHODONTIC STUDY MODELS USING RAMANUJANS EQUATION FOR PERIMETER OF ELLIPSE.
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- Post Graduate student, Department of Orthodontics & Dento-facial Orthopedics, Pandit Deendayal Upadhyay Dental College & Hospital. Kegaon, Solapur- 413255. Maharashtra, India.
- Professor and HOD, Department of Orthodontics & Dento-facial Orthopedics, Pandit Deendayal Upadhyay Dental College & Hospital. Kegaon, Solapur- 413255. Maharashtra, India.
- Reader, Department of Orthodontics & Dento-facial Orthopedics, Pandit Deendayal Upadhyay Dental College & Hospital. Kegaon, Solapur- 413255. Maharashtra, India.
- Senior Lecturer, Department of Orthodontics & Dento-facial Orthopedics, Pandit Deendayal Upadhyay Dental College & Hospital. Kegaon, Solapur- 413255. Maharashtra, India.
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Introduction: The most common problem encountered in borderline case is whether to extract or to expand the dental arch. The prediction of increase or decrease in arch perimeter by expansion or protraction or retroclination of incisors is a very much decisive. Materials and Method: 25 pairs of pre and post orthodontically treated study models were evaluated and correlated for measured arch perimeter with predicted arch length obtained by applying Ramanujan?s equation for perimeter of ellipse. Linear and circumferential measurements were done directly on mid-buccal surfaces. Results: Ramanujan\'s equation had a high level of correlation (0.99) when comparing the measured perimeter of the maxillary arch with the calculated arch perimeter with 1.28% error. Conclusion: The ellipse is an accurate geometric shape that best fits the maxillary arch. The increase and decrease in the arch-length after expansion, proclination or retroclination of teeth can also be very well predicted.
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[Sayyed Mohammed Qadri, Sunilkumar P, Chandrashekhargouda Patil, Akash Lavate, Prashant Yaragamblimath and Sneha Hoshing. (2017); CORRELATION BETWEEN MAXILLARY ARCH PERIMETER OF PRE AND POST ORTHODONTIC STUDY MODELS USING RAMANUJANS EQUATION FOR PERIMETER OF ELLIPSE. Int. J. of Adv. Res. 5 (Nov). 391-397] (ISSN 2320-5407). www.journalijar.com
PG Student, PDU Dental College, Solapur