Miao, Hui Papillary reconstruction and guided tissue regeneration for combined periodontal-endodontic lesions caused by palatogingival groove and additional root: a case report. [electronic resource] - Clinical case reports Dec 2015 - 1042-9 p. digital Publication Type: Case Reports; Journal Article ISSN: 2050-0904 Standard No.: 10.1002/ccr3.441 doi