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HighlightsThe aim of this report is to demonstrate the unexpected antral septa type that compromises elevation of schneiderian membrane.CT is useful for examining sinus anatomy and successful surgical planing for preventing complications.As seen on the literature horizontal septas were seen rarely.

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Background: To evaluate the effect of low-level laser therapy (LLLT) on bone healing in patients undergoing bilateral sinus lifting and simultaneous dental implant application. Methods: Twelve patients with total/partial posterior maxillary edentulism who needed bilateral sinus bone augmentation were included in the study. Dental implants were inserted in the same session. LLLT (λ = 630–660 nm, 25 mW/cm 2 , 6 min) was used for one operation side on the 1 st , 3 rd , 5 th , and 7 th days, whereas contralateral side served as control side. Preoperative and postoperative 1 st , 3 rd , and 6 th month orthopantomograms were obtained using the aluminum step-wedge technique. Optic density analyses were performed using a Cardinal Health Digital Densitometer (Fluke Biomedical 07-443) with 1 mm diameter. Digital densitometry results were obtained as the equivalent aluminum thickness for each radiograph. These data were used to evaluate the changes in optical bone density and to compare the treatment side with the control side for each patient. Results: The LLLT side showed better results than the control side according to the densitometry results. Increase in the bone density at all the postoperative intervals was statistically significant ( P < 0.05). Conclusions: LLLT enhances bone regeneration in sinus augmentation with simultaneous dental implant placement.