Fig. 2

Schematic diagram. a R1 represents the bone volume fraction in the area 1.5 mm wide and 5 mm long from the inner thread of the implant. b R2 represents the bone volume fraction in the area 1.5 mm wide and 3 mm long from the inner thread of the implant. c R3 represents the bone volume fraction in the area 1 mm wide and 3 mm long from the inner thread of the implant. d Histological bone-to-implant contact measurement. Coronal bone in contact (BIC): bone in contact with implant surface within 3 mm from the most coronal bone contact. Total BIC: bone in contact with implant surface within 6 mm from the most coronal bone contact