Forty partially or fully edentulous patients having 3 to 6 mm of residual crestal height and at least 4 mm thickness below the maxillary sinuses ( measured on a CT scan ) were randomised to receive one to three , 10 - to 16-mm-long implants ( 20 patients ) after lateral sinus lifting with 50 % anorganic bovine ( Bio-Oss ) and 50 % autogenous bone , or 8-mm-long implants ( 20 patients ) after crestal sinus lifting with autogenous bone .
