“…A total of 24 clinical trials 149‐172 and 13 case series 185‐197 were non‐classifiable, as defined in Materials and Methods (Tables 4 and 5). Of the 85 remaining clinical trials, 53,65‐148 eight reported outcomes after applying regenerative therapy on maxillary facial/interproximal Class II furcation defects, 76,87,92,100,105,140,148,208 68 on mandibular facial/lingual Class II furcation defects, 65‐68,70‐72,75,77,78,80‐85,87‐90,93‐99,101‐104,106,107,110‐112,114‐122,124‐139,141‐147 one on maxillary Class III furcation defects, 91 nine on mandibular Class III furcation defects, 69,73,74,77,86,108,109,113,123 and one on maxillary premolars presenting Class I and Class II furcation defects 79 . Of the 14 selected case series, two reported on the treatment of maxillary facial/interproximal Class II furcation defects, 177,180 11 on mandibular facial/lingual Class II furcation defects, 173‐176,178‐184 and two on mandibular Class III furcation defects 198,199 .…”