Dental The number of walls in the apical portion of the defect is often greater than that of its occlusal portion, is referred to as A Osseous Craters B Combined osseous defect C Horizontal defect D Vertical defect 💡 Explanation The number of walls in the apical portion of the defect is often greater than that of its occlusal portion, is referred to as ✓ Correct Answer: B. Combined osseous defect