The presence of dehiscences and fenestrations were positively correlated with thin alveolar bone and negatively correlated with occlusal attrition. African-American males and Caucasian females were significantly more likely to have dehiscences, while African-American females were significantly more likely to have fenestrations.

Experimental sites lost 1.0 to 1.5 mm in bone and attachment compared to controls, without any significant clinical benefit. While the concept of surgically obturating Class III furcation defects with a safe, osteoconductive material remains attractive, HAC did not promote repair or regeneration in this technique.