Background
Maxillary sinus augmentation is frequently employed to provide adequate vertical bone dimension for implant placement in sites with insufficient bone height. There are two techniques available: (I) The lateral window approach or (II) the transcrestal approach. The sinus lift lateral window technique was introduced by Tatum in 1976 and by Boyne in 1980. Since its introduction by Tatum, the sinus lift has undergone several modifications to expand its feasibility and increase success rates with reduced complications(Sindel et al.2018). One modification has been published by Summers in 1998 when osteotomes were used to access the sinus cavity through a transcrestal window. Many different biomaterials have been used, including autogenous bone, particulate alloplastic, xenogeneic or allogeneic bone substitutes. All material groups show promising and predictable results(Aghaloo & Moy 2007). Moldable putty-like materials may be beneficial since they can gently be squeezed through the transcrestal osteotomy(Kher et al. 2014), and because of a decent particle distribution size may reduce risk of tearing Schneiderian membrane. The dental putty is composed of a calcium phosphate silicate trapped in a carrier(Mazor et al. 2013). The material is ready to be used. Most studies indicate that 80-90 percent is absorbed within 4-6 months, while regenerating bone at the same time. The putty has consistently proven to regenerate bone when used for socket grafting, grafting of periodontal defects or in crestal sinus lift procedures(Gonshor et al. 2011, Uppal et al. 2011, Mahesh et al.2012, Jodia et al.2014, Kotsakis et al.2014, Sindel et al. 2018,  Mazor et al. 2013).