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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 35 (2020), No. 3     26. May 2020
Int J Oral Maxillofac Implants 35 (2020), No. 3  (26.05.2020)

Page 591-598, doi:10.11607/jomi.8005, PubMed:32406658

Influence of the Dimensions of the Antrostomy on Osseointegration of Mini-implants Placed in the Grafted Region After Sinus Floor Elevation: A Randomized Clinical Trial
Imai, Hideki / Iezzi, Giovanna / Piattelli, Adriano / Ferri, Mauro / Alccayhuaman, Karol Alí Apaza / Botticelli, Daniele
Purpose: To evaluate the osseointegration of mini-implants placed in grafted sinuses with lateral windows of two different dimensions.
Materials and Methods: Sinus floor augmentation was performed in volunteers using a lateral window. The antrostomy was systematically prepared with a height of either 8 mm (large group) or 4 mm (small group). After 6 months of healing, mini-implants were placed in the grafted region. Biopsy specimens including the mini-implants were harvested 3 months after placement.
Results: Twenty biopsy specimens, 10 from each group, were suitable for the histologic analysis. Similar amounts of new bone-to-implant contact were obtained in both the large (41.1% ± 19.5%) and the small (42.8% ± 13.2%) groups (P = .940). Small percentages of residues of xenograft were found in contact with the implant surface, with 0.6% ± 1.1% in the large group and 5.9% ± 9.5% in the small group (P = .098). The new bone density around the implants was 31.7% ± 8.2% and 34.0% ± 7.9% in the large and small groups, respectively (P = .623).
Conclusion: The dimensions of the antrostomy did not influence the histologic healing of implants placed 6 months after sinus floor augmentation.

Keywords: bone grafting, dental implants, osseointegration, sinus floor augmentation