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Year : 2013  |  Volume : 1  |  Issue : 2  |  Page : 45-51

Assessment of anteroposterior and transverse first premolar extraction changes using palatal rugae and comparative analysis with lateral cephalogram in Angle's Class I and II patients: An institutional retrospective study

Department of Orthodontics and Dentofacial Orthopedics, Manipal College of Dental Sciences, Mangalore, India

Correspondence Address:
Supriya Nambiar
Department of Orthodontics and Dentofacial Orthopedics, Manipal College of Dental Sciences, Mangalore - 575 001, Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/2321-3825.116284

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Introduction: The most common method of resolving substantial tooth size-arch length discrepancies (TSALD) is extraction of premolars followed by space closure that involves distal movement of anterior teeth, mesial movement of posterior teeth, or a combination of both. The palate is an important area to describe change during premolar extractions, especially the palatal rugae due to their supposed uniqueness and overall stability The aim of this study was to measure changes in the positions of the incisors and molars, relative to the palatal rugae, and the changes in arch width relative to the mid palatine raphe. Materials and Methods: It was a retrospective study of 90 treated cases, 30 cases each of three different types of malocclusion from the Department of Orthodontics, Manipal College of Dental Sciences, and Manipal University. Measurements from the dental study models were compared to the values obtained from the lateral cephalograms after digitizing with View box software. Arch width changes were also assessed. Conclusion: First premolar extraction spaces were used up approximately 50% by anterior retraction and buccal segment advancement, respectively. Retraction of teeth measured from the study models was comparable to that on the lateral cephalogram. So superimposition of progressive study models can be used to assess antero posterior tooth movements as with maxillary cephalometric superimpositions.

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