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2. The six keys to normal occlusion
3. American Board of Orthodontics (ABO). Grading system for cast and radiographic evaluation.https://www.americanboardortho.com/orthodontic‐professionals/about‐board‐certification/clinical‐examination/certification‐renewal‐examinations/mail‐in‐cre‐submission‐procedure/case‐report‐examination/case‐report‐preparation/cast‐radiograph‐evaluation/
4. Assessing incisor inclination: a non-invasive technique