The objective was to present a novel technique for antrostomy performed before sinus elevation in atrophic maxilla for subsequent implant placement.
MATERIALS Y METHODS
The study included 10 sinus elevations performed by the proposed technique in nine consecutive patients presenting with inadequate posterior maxillary height. The technique is described, calculating the antrostomy surface area, volume of bone tissue obtained and final height attained in each case. A total of 16 Mozo Grau ® threaded implants were placed (3 implants of 3.75 x 10 mm, 7 implants of 3.75 x 11.5, 2 implants of 3.4 x 11.5 and 4 implants of 3.75 x 13).
All ten elevations were accomplished. Mean antrostomy surface area was 0.55 mm2, mean bone volume obtained was 0.56 cm3 and mean height attained was 11.7 mm from a baseline mean height of 5.6 mm. Out of the 16 implants, 14 were inserted immediately after the elevation and 2 were inserted in a second step, after ossification; 93.7% of the implants were osseointegrated at 6 months after prosthesis placement.
The use of bone scrapers to create antrostomy for sinus elevation is a simple and very safe procedure. It provides a variable amount of particulate bone graft that is easily handled and highly useful for packing the cavity that will elevate the sinus membrane.