Fig. 2From: The predictive performance of surgical treatment in upper molars with combined bony defect and furcation involvement: a retrospective cohort studyFlow chart of this study. PD, pocket depth; BoP, bleeding on probing; Deg., degree; GTR, guided tissue regeneration; EMD, enamel matrix derivative; SPT, supportive periodontal treatment; N, number (patient level); n, number (site level)Back to article page