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. 2016 Dec 19;6:39268. doi: 10.1038/srep39268

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(A) Type A (non-contact), there is space between the root surface and the inner boarder of lingual plate; (B) Type B (contact), the root apex contacts with lingual plate directly; (C) Type C (perforation), the root apex perforates beyond the outer boarder of lingual plate.