Normal faciolingual inclination of tooth crowns for Iraqi adolescent in Mosul City

Abstract

The purposes of this study are to determine the faciolingual inclinations of tooth crowns in Class I normal occlusion of Iraqi adolescent in Mosul City, investigate the possible significant differences between genders, and determine the correlation of the faciolingual inclination of teeth crown with each others.The sample of this study consisted from 35 Iraqi adolescents (19 males and 16 females) aged 12-16 years selected according to certain criteria from Mosul City. Stone casts were taken for each subject, the faciolingual inclinations were made on the dental models of the subjects by using torque angle gauge.The data were analyzed with the Statistical Package for Social Sciences program and it was found that each tooth distally to the central incisor had more lingual inclination than did its neighbor. The females had more labial inclination of upper lateral incisor and more lingual inclination of the lower canine, premolars and first molar as compared with the males. Most intraarch teeth torque correlation were positive and decreased with remoteness while most interarch teeth correlation showed weak negative correlation.

Changes of Teeth Inclination After Orthodontic Treatment of Class II Division 1 Malocclusion

“…In the four groups, there was an increase in the crown lingual inclination in the upper and lower teeth so that each tooth distally had more negative torque value than its neighbor starting from the central incisors towards molars. This is in accordance with other studies (3,8,9,14,19) (Tables 1, 2, 3 and 4).…”

“…Measurements were done on the dental models to assess the labiolingual teeth inclination (torque) of the teeth by the intersection of a line perpendicular to the occlusal plane, and a line tangent to the middle of the labial or buccal long axis of the clinical crown (2,25) (LA points) using a simple instrument (locally constructed) for this purpose. This instrument was used previously by Vardimon and Lambertz (9) and AL-Sayah (19) as shown in Figure (1).…”

“…Several studies on the faciolingual inclination have been published (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) but only few statistical investigation have been performed. These reports concluded that there was a considerable variation in faciolingual inclinations in normal occlusion.…”