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ePaper created 2016-09-20, 16:58:27 | version 1.38.0
Journal of Oral Science & Rehabilitation 12 Volume 2 | Issue 3/2016 M i n i m a l l y i n v a s i v e s i n u s l i f t i m p l a n t s y s t e m and supported by several longitudinal studies that attest to an average implant survival rate close to 92% in the medium term.7, 8, 24 Recent publications have shown that transalveolar sinus floor elevation is a reliable method for im- plant placement in the posterior maxilla, even at sites with ≤ 4 mm of residual alveolar bone height.17, 25–27 Nevertheless, implant survival rates may decrease with reduced residual bone height.18, 28 The main concerns relatedtothetranscrestal approach, compared with the lateral surgical approach, are the absence ofdirectvisualization ofthe sinus cavityand Schneiderian membrane, the limited amount ofbone augmentation achie- ved and the high risk of inadvertent perforation of the Schneiderian membrane during fracture ofthe sinus floorwith osteotomes, or burs, with or without stop drills, without the possibility of repairing the torn membrane. Nevertheless, in an eight-year retrospective study on 1,100 par- ticipants with 1–5 mm of residual bone height who received 1,557 implants with minimally invasive hydraulic elevation ofthe Schneiderian membrane, an incidence of membrane perfora- tion of less than 0.5 % was reported.15 Fig. 13 Panoramic radiograph taken one year after loading. Fig. 14 CBCT scan one year after loading (sagittal view). Fig. 15 CBCT scan one year after loading (coronal view). Fig. 13 Figs. 14 & 15