“…It has been established that furcation involvement, specifically degree II and III, increases the risk of tooth loss, even in patients undergoing regular SPT (Nibali et al, 2016). The risk seems to increase by both horizontal (Nibali, Krajewski, et al, 2017b;Nibali et al, 2016) and vertical furcation degree (Nibali, Tomlins, & Akcalı, 2018a;Tonetti, Christiansen, & Cortellini, 2017). However, approximately 60% of degree III furcation-involved molars included in longitudinal studies survived at least 10 years (Nibali et al, 2016).…”