Timothy R. Glass, Timothy Tremont, Chris A. Martin, Peter W. Ngan

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Presentation transcript:

A CBCT evaluation of root position in bone, long axis inclination and relationship to the WALA Ridge Timothy R. Glass, Timothy Tremont, Chris A. Martin, Peter W. Ngan Seminars in Orthodontics Volume 25, Issue 1, Pages 24-35 (March 2019) DOI: 10.1053/j.sodo.2019.02.004 Copyright © 2019 Terms and Conditions

Figure1 Schematic depicting WALA Ridge, FA Point, Center of Resistance, and Basal Bone. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure2 WALA Ridge was identified on a cast with a red pencil. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure3 A stainless steel endodontic ruler was laid across the occlusal surface of each posterior tooth for vertical measurements from the ruler to the WALA Ridge. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure4 Digital caliper was used to measure the distance from the ruler to the WALA Ridge or WALA Ridge vertical (WV). Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure5 WALA Ridge using the 6 Elements software. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure6 Measurement of LAI with reference to ROP. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure7 Measuring center of resistance in the sagittal view. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure8 Schematic demonstrating data points and reference lines. See Table 2 for descriptions of points and lines. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure9 Alveolar bone measurements in the coronal view. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure10 Basal bone measurements in the coronal view. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure11 Edentulous maxilla and mandible. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure12 Mandibular incisor “centered” in teardrop-shaped alveolar process/symphysis. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure13 Mandibular incisor in oblique-shaped alveolar process/symphysis. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure14 Mandibular molar, alveolar process and “basal bone”. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure15 Alveolar process cantilevered over “basal bone”. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure16 Buccally applied force which would cause a tipping movement with a moment and a center of rotation near a center of resistance. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure17 Upright maxillary and mandibular molars; crossbite - maxillary skeletal expansion indicated. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure18 Lingually inclined mandibular molars; upright maxillary molars; no crossbite-maxillary skeletal expansion indicated if mandibular molars are buccally tipped to upright position. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure19 Upright mandibular molars; buccally inclined maxillary molars; no crossbite – maxillary skeletal expansion indicated if maxillary molars are tipped palatally to upright position. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure20 Buccally inclined maxillary molars; lingually inclined mandibular molars; no crossbite – maxillary skeletal expansion indicated if maxillary molars are tipped palatally to upright position and mandibular molars are tipped buccally to upright position. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions

Figure21 Lingually inclined maxillary and mandibular molars; no crossbite – no maxillary skeletal expansion indicated if maxillary and mandibular molars are tipped buccally to upright positions. Seminars in Orthodontics 2019 25, 24-35DOI: (10.1053/j.sodo.2019.02.004) Copyright © 2019 Terms and Conditions