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    Determinação da forma dos arcos metálicos para a técnica ortodôntica lingual a partir dos arcos dentais anatômicos
    (Universidade Federal de São Paulo (UNIFESP), 2020-06-16) Kairalla, Silvana Allegrini [UNIFESP]; Pignatari, Shirley Shizue Nagata [UNIFESP]; Universidade Federal de São Paulo
    Introduction: Despite the existing studies on Lingual Orthodontics, there is still no consensus on the need for individualized metal arches related to the shape of the dental arch. Therefore, the creation of a diagram could simplify the technique, making their application more reliable. Objetives: This study aimed to identify the anatomical shapes and sizes of dental arches, to create a template, to determine the width, length, height and volume of the hard palate and to establish a relationship between the the facial types measurements and the patterns of the analysed individuals. Methods: The sample consisted of 70 Caucasian individuals with normal natural occlusion from UMESP. The models were three-dimensionally digitised, and the images were exported to the software Delcam PowerSHAPE® 2010. Landmarks were selected on the lingual surface of the teeth to obtained the dental arch shapes and sizes, to define the template and to obtain the width, length, height and volume of the hard palate. The Shapiro-Wilk test was used to evaluate the data distribuition of normality and the t-Student to compare the diferences of the genders. The qui-square test was used to verify the association between the archs shapes; the facial patterns and facial types. Analysis of covariance (ANCOVA) was utilized to compare the facial patterns and types with the width, length, height and volume of the palate. Results: Various sizes of dental lingual arches were found. Six sizes were defined for each gender, 3 for the maxilla and 3 for the mandible, labelled P, M and G. A template was created with 18 anatomic lingual arch designs. It was also possible to obtain three dimensional mesurements of the width, length, height and volume of the hard palate. Conclusions: Landmark positions were determined, allowing the creation of lingual arches that are more compatible with the anatomical forms and sizes of the maxilla and mandible. They also made possible the creation of a template for an anatomic lingual metallic arch form. The three-dimensional assessment of the width, length, height and volume of the hard palate, showed that the comparison between the facial patterns and facial types does not indicate a significant statistical difference.