Acquisition of the 3D surface of the palate by in-vivo digitization with Wave

Authors:
Yana Yunusova;Melanie Baljko;Grigore Pintilie;Krista Rudy;Petros Faloutsos;John Daskalogiannakis
Affiliations:
Department of Speech-Language Pathology, University of Toronto, 160-500 University Avenue, Toronto, ON, Canada M5G 1V7;Department of Computer Science and Engineering, York University, 4700 Keele Street, Toronto, ON, Canada M3J 1P3;Department of Speech-Language Pathology, University of Toronto, 160-500 University Avenue, Toronto, ON, Canada M5G 1V7;Department of Speech-Language Pathology, University of Toronto, 160-500 University Avenue, Toronto, ON, Canada M5G 1V7;Department of Computer Science and Engineering, York University, 4700 Keele Street, Toronto, ON, Canada M3J 1P3;Department of Orthodontics, University of Toronto, 124 Edward Street, Toronto, ON, Canada M5G 1G6
Venue:
Speech Communication
Year:
2012

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Abstract

An accurate characterization of the morphology of the hard palate is essential for understanding its role in human speech. The position of the tongue is adjusted in the oral cavity, of which the hard palate is a key anatomical structure. Methods for modeling the palate are limited at present. This paper evaluated the use of a thin plate spline (TPS) technique for reconstructing the palate surface from a series of in-vivo tracings obtained with electromagnetic articulography using Wave (NDI). Twenty-four individuals (13 females and 11 males) provided upper dental casts and in-vivo tracings. Models of the palate surfaces were derived from data acquired in-vivo and compared to the scanned casts. The optimal value for the smoothness parameter for the TPS technique, which provided the smallest error of fit between the modeled and scanned surfaces, was determined empirically (the value of 0.05). Significant predictors of the quality of the fit were determined and included the individuals' palate characteristics such as palate slope and curvature. The tracing protocol composed of four different traces produced the best palate models for the in-vivo procedure. Evidence demonstrated that the TPS procedure as a whole is suitable for modeling the palate surface using a small number of in-vivo tracings.