Micro‐computed tomography analysis of biopsies taken after maxillary sinus floor elevation with BCP60/40 or BCP20/80. (a) Bone volume over total tissue volume (BV/TV) and (b) graft volume over total tissue volume (GV/TV) as assessed by micro‐computed tomography analysis retrieved after maxillary sinus floor elevation with BCP60/40 or BCP20/80. BV/TV and GV/TV were assessed for native bone, transition zone, region l, region ll, and region lll. Values are mean, SD (n = 7–10). *Significantly different from BCP60/40, p < .025. BCP60/40, biphasic calcium phosphate with a hydroxyapatite/ß‐tricalcium phosphate ratio of 60/40; BCP20/80, biphasic calcium phosphate with a hydroxyapatite/ß‐tricalcium phosphate ratio of 20/80; BV, bone volume; TV, total volume; GV, graft volume; nb, native bone; tz, transition zone; Rl, region l; Rll, region ll; Rlll, region lll