Sinus floor augmentation using miniscrew and in situ hardening biomaterial: method and case report.

Sinus floor augmentation in case of severe pneumatization is a challenge for surgical management. We present a low invasive endoscopically assisted technique facilitating the stabilization of augmentation material in the subantral space. The technique consists of (1) trepanation of the lateral sinus wall with tunnelling of the sinus membrane and creation of the subantral space, (2) subantroscopically assisted insertion of a mini screw, (3) precise stepwise placement of in situ hardening graft material with antroscopic control. Based on a case example, details of the procedure are presented. The technique provides a minimally invasive treatment for difficult and instable augmentation sites.