Читать книгу Periodontics - Fernando Suarez - Страница 99

Intermediate bifurcational ridge (IBR) is defined as a distinct ridge running across the bifurcation in a mesiodistal direction.¹⁰ It originates from the mesial surface of the distal root at about 2 mm from the height of the furcation area and ends high up on the distal surface of the mesial root by merging within the root concavity.¹⁰ Histologic evaluation of IBRs has shown that these developmental anomalies are formed mostly by dentin but also contained cementum.¹⁰

Everett et al reported that among 328 extracted mandibular first molars, the prevalence of IBRs was 73%.¹⁰ This finding was confirmed by two other studies that revealed a presence of IBRs in 70% and 76.8% of extracted first molars.^68,124 Moreover, Hou and Tsai found that IBRs are highly associated with CEPs (63.2%) and Class III furcations (25.3%).⁵⁵