Abstract
15Nov 2017 CORRELATION BETWEEN MAXILLARY ARCH PERIMETER OF PRE AND POST ORTHODONTIC STUDY MODELS USING RAMANUJANS EQUATION FOR PERIMETER OF ELLIPSE. Sayyed Mohammed Qadri , Sunilkumar P , Chandrashekhargouda Patil , Akash Lavate , Prashant Yaragamblimath and Sneha Hoshing. 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.
Highlights
The most common problem encountered in borderline case is whether to extract or to expand the dental arch
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
A non-extraction orthodontic treatment plan incorporating dental arch expansion is often initiated in patients who exhibit minimal crowding or who would benefit from increased lip-support afforded by incisor advancement. [5]
Summary
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. The increase and decrease in the archlength after expansion, proclination or retroclination of teeth can be very well predicted. Various treatment options to treat the arch-length discrepancies (ALD) are by extraction of teeth,[1] expansion of the arches,[2] proclination of the incisors,[3] or by reduction of the inter-proximal surfaces or distalization of the posterior segment. A non-extraction orthodontic treatment plan incorporating dental arch expansion is often initiated in patients who exhibit minimal crowding or who would benefit from increased lip-support afforded by incisor advancement.
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