1 2 Chen, Leon, & Cha, Jennifer, An 8-Year Retrospective Study: 1,100 Patients Receiving 1,557 Implants using the Minimally Invasive Hydraulic Sinus Condensing Technique, 'Innovations in Periodontics, Volume 76, Number 3, Page 482 March, 2005 ↑ Kharazmi M, Hallberg P. "Secondary sinus lift: viable technique for when a membrane is raised without a graft, and fails".