“…Despite the longstanding application of this method, basic information about factors that influence bone regeneration capacity after sinus augmentation is rare. For implant failure (Alsaadi et al 2007;Grecchi et al 2009;Tsolaki et al 2009) and impaired fracture healing (Giannoudis et al 2007;Parker et al 2007;Strube et al 2008), the list of investigated risk factors is much longer and includes amongst others patients' age and sex, systemic diseases influencing bone healing such as osteoporosis, and quality and quantity of residual alveolar bone. Whether the risk factors advanced age, female sex, osteoporosis and anatomical features also directly apply for the bone regeneration capacity after sinus augmentation remains to be elucidated.…”