Maxillary posterior partially edentulous or totally edentulous twelve patients who need bilateral sinus bone augmentation were included in this study. Sinus bone augmentation and dental implant surgeries were done simultaneously. Low level laser therapy (LLLT) was (λ= 630-660 nm, 25 mw / cm², 6 mins) applied for just one operation side at first, third, fifth and seventh days. Treatment side were randomly selected by another surgeon who applied LLLT. Panoramic radiographs were taken at the first, third and sixth months using aluminum step-wedge technique. Optic Density analyses were performed using Cardinal Health Digital Densitometer (Fluke Biomedical 07-443) with 1mm diameter. Digital densitometric results were obtained as equivalent aluminum thickness for each radiograph. These data were used to evaluate changes in optical bone densitometry and compare the LLLT applied side and control side for each patient.