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Hi <span class=”atwho-inserted” contenteditable=”false” data-atwho-at-query=”@james-e”>@james-ellsworth</span>, I see what you are referring to now. I have certainly taken note of this feature before and I know others have as well; however, as far as I know, no one has really provided an explanation for this feature and I don’t think there is any official scientific terminology for it either. I suppose the slight hook shape could aid in anchoring the root within the jaw. I wish I had more answers for you, but this one still remains a mystery.