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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 35 (2020), No. 2     10. Mar. 2020
Int J Oral Maxillofac Implants 35 (2020), No. 2  (10.03.2020)

Page 350-356, doi:10.11607/jomi.7843, PubMed:32142572

Tomographic Assessment on the Influence of the Use of a Collagen Membrane on Dimensional Variations to Protect the Antrostomy After Maxillary Sinus Floor Augmentation: A Randomized Clinical Trial
Imai, Hideki / Lang, Niklaus Peter / Ferri, Mauro / Hirota, Atsuya / Apaza Alccayhuaman, Karol Alí / Botticelli, Daniele
Purpose: To evaluate the dimensional variations after elevation of the maxillary sinus floor and the healing of the antrostomy left unprotected or protected by a collagen membrane.
Materials and Methods: Twenty patients were included in the study. After the elevation of the sinus mucosa, natural bovine bone was grafted into the elevated space. In 10 randomly selected patients, a native collagen membrane made of porcine corium was placed on the antrostomy (membrane group). In the other 10 patients, the antrostomy was left uncovered (no-membrane group). Cone beam computed tomography (CBCT) images were taken for all patients before surgery (T0), 1 week after sinus floor augmentation (T1), and after 9 months of healing (T2), and evaluations of dimensional variations over time of soft and hard tissues were performed.
Results: At T1, the elevation of the sinus floor in the middle aspect was 12.5 ± 3.8 mm and 11.9 ± 3.6 mm in the membrane and no-membrane groups, respectively. At T2, the reduction in height of the elevated space was 0.6 ± 0.9 mm and 0.8 ± 0.8 mm in the membrane and no-membrane groups, respectively. The elevated area decreased between ~10% and 11% in the membrane group and between ~15% to 20% in the no-membrane group. However, no statistically significant differences were found.
Conclusion: The use of a collagen membrane to cover the antrostomy after sinus floor elevation did not produce significant clinical effects on dimensional variations over time.

Keywords: antrostomy, biomaterials, CBCT, randomized controlled clinical trial, surgery