Tore Sinus Membrane and Grafted with Regeneform: Thoughts on this Case?

Dr. N. asks:

I performed a sinus lift using a lateral window approach. The problem I encountered during the surgery is that I inadvertently tore away the sinus membrane in the area where I needed to graft. The membrane had been completely removed. I grafted the area with Regenaform [demineralized freeze dried bone allograft consisting of cortical and cancellous bone that is osteoconductive]. The patient was recalled every 2 weeks for 2 months post-operative to have radiographs taken for follow-up. Any thoughts on this case?

Pre op xray with stent

window for sinus augmentaion

Graft being placed with no sinus lining

Radiograph after surgery

radiograph with crowns & implants after 5 months