Bone Graft Displacement After Maxillary Sinus Floor Augmentation With or Without Covering Barrier Membrane: A Retrospective Computed Tomographic Image Evaluation

Ohayon L, Taschieri S, Friedmann A, Del Fabbro M. Int J Oral Maxillofac Implants. 2019 May/June;34(3):681–691.

The goal of this retrospective study was to evaluate, if a collagen barrier membrane placed over the lateral bone window affects the stability of the bone graft and the displacement of bone graft particles following sinus floor augmentation.


41 patients did underwent lateral sinus floor augmentation using cerabone®. The bone windows were either covered with collprotect® membrane (control group, n=17) or left uncovered (test group, n=24). All sites were closed by the flap. CBCTs were taken immediately after the surgery, and seven days as well as six months post-operative in order to evaluate bone graft stability and bone graft particle displacement. Post-surgical morbidity was analyzed using a visual analog scale (VAS) seven days after the surgical intervention.


  • Mean displacement of the bone graft particles six months post-operative was significantly greater in the test group (3.8±3.1 mm) than in the control group (0.5±0.4 mm)
  • Post-operative morbidity was significantly more pronounced in the test group (pain 3.3±1.4/swelling 4.3±4.5) than in the control group (2.1±0.9/2.7±0.9)


The authors concluded that a barrier membrane placed over the lateral bone window helped preventing bone graft particles displacement thus reducing post-operative morbidity.


Dr. Laurent Ohayon, France

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