“…The search was complemented by a screening of the Open Grey database and of the reference lists of included studies and previous systematic reviews or guidelines dealing with regenerative surgical procedures for the treatment of periodontal intra‐bony defects (Cãlin & Pãtraşcu, ; Castro et al, ; Darby & Morris, ; Del Fabbro, Bortolin, Taschieri, & Weinstein, ; Esposito et al, ; Giannobile & Somerman, ; Graziani et al, ; Hou, Yuan, Aisaiti, Liu, & Zhao, ; Kao, Nares, & Reynolds, ; Khojasteh, Sogeilifar, Mohajerani, & Nowzari, ; Khoshkam et al, ; Koop, Merheb, & Quirynen, ; Matarasso et al, ; Miron et al, ; Murphy & Gunsolley, ; Needleman et al, ; Pagliaro et al, ; Panda, Doraiswamy, Malaiappan, Varghese, & Fabbro, ; Parrish, Miyamoto, Fong, Mattson, & Cerutis, ; Patel, Wilson, & Palmer, ; Rathe, Junker, Chesnutt, & Jansen, ; Reynolds, Aichelmann‐Reidy, Branch‐Mays, & Gunsolley, ; Roselló‐Camps et al, ; Sculean et al, ; Stoecklin‐Wasmer et al, ; Troiano et al, ; Trombelli, Heitz‐Mayfield, Needleman, Moles, & Scabbia, ; Yen, Tu, Chen, & Lu, ; Zanatta, Souza, Pinto, Antoniazzi, & Rösing, ; Zhou et al, ).…”