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PLGA group. (a) Magnification of panoramic radiograph of left sinus showing a residual bone height insufficient to implant positioning; (b) periapical X-ray of the same site of (a) immediately after sinus floor elevation surgery; (c) periapical X-ray of the same site of (a) six month after sinus floor elevation surgery; (d) periapical X-ray after implant positioning in the new-formed bone.
