The current tx plan is to place an 8mm implant in an upper molar area where the ridge height is approx. 7-8 mm. The surgical plan is to drill through the sinus floor quickly and carefully to achieve bicortical fixation without sinus lift. But my questions are: 1. if the sinus membrane is much thickened like this case, is there no need to worry about nicking the sinus membrane? 2. if the drill goes into the sinus membrane by 2-3mm in this case and drills back and forth, I am just curious if the sinus membrane gets torn?
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