Three-dimensional assessment of the palatal contour changes in orthodontically treated cases: A scanned maxillary cast analysis

Abstract

Context: An accurate method for assessing the contour, symmetry, and stability of the dental arches is a prerequisite for investigations of form-function relationship. Various approaches to the study of arch shape have been described, but they were either best suited for simple visual analysis or when maximal accuracy was desired. The cost and complexity of the techniques and the equipment employed for assessing the arch shape preclude their general application. Hence, the present study was undertaken to evaluate the changes in palatal contour in orthodontically treated cases using scanned maxillary casts. Aims: The aim of the study was to evaluate the changes in palatal contour in orthodontically treated cases using scanned maxillary casts. Settings and Design: Retrospective study. Subjects and Methods: One hundred pre- and post-treatment maxillary casts of fifty completed cases in permanent dentition phase managed with fixed mechanotherapy were included in the present study. The landmarks were identified; scanning of the casts was done using flatbed scanner, and the palatal contoural changes were measured in three-dimensions after superimposing the pre- and post-treatment scanned images on medial points of the third palatal rugae which were considered as stable landmark. Statistical Analysis Used: Paired t -test. Results and Conclusions: There is statistically significant difference between the pre- and post-treatment width, anteroposterior length, and depth of the palate in orthodontically treated cases.