1. 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 (March 2019)
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2. Figure1
Schematic depicting WALA Ridge, FA Point, Center of Resistance, and Basal Bone.
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3. 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.)
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4. 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.
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5. Figure4
Digital caliper was used to measure the distance from the ruler to the WALA Ridge or WALA Ridge vertical (WV).
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6. Figure5 WALA Ridge using the 6 Elements software.
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7. Figure6 Measurement of LAI with reference to ROP.
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8. Figure7 Measuring center of resistance in the sagittal view.
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9. Figure8
Schematic demonstrating data points and reference lines. See Table 2 for descriptions of points and lines.
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10. Figure9 Alveolar bone measurements in the coronal view.
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11. Figure10 Basal bone measurements in the coronal view.
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12. Figure11 Edentulous maxilla and mandible.
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13. 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.)
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14. Figure13
Mandibular incisor in oblique-shaped alveolar process/symphysis.
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15. Figure14 Mandibular molar, alveolar process and “basal bone”.
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16. 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.)
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17. Figure16
Buccally applied force which would cause a tipping movement with a moment and a center of rotation near a center of resistance.
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18. Figure17
Upright maxillary and mandibular molars; crossbite - maxillary skeletal expansion indicated.
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19. Figure18
Lingually inclined mandibular molars; upright maxillary molars; no crossbite-maxillary skeletal expansion indicated if mandibular molars are buccally tipped to upright position.
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20. Figure19
Upright mandibular molars; buccally inclined maxillary molars; no crossbite – maxillary skeletal expansion indicated if maxillary molars are tipped palatally to upright position.
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21. 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.
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22. 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.
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