More than half of the implants placed in the posterior maxilla require sinus floor elevation (SFE) [1]. The need for this procedure is explained by continuous ridge resorption in an apical direction after tooth extraction combined with progressive sinus pneumatization in addition to poor bone quality that is frequently seen in the maxilla [2].

Sinus membrane perforation is considered the most common complication during sinus floor elevation procedures, and its percentage varies according to the method used. Perforations happen either while fracturing the floor of the sinus or during the elevation of the mucosa [3, 4].

Crestal approach to the sinus kit (CAS kit) was introduced by OSSTEM implants (Osstem Implant Co., Busan, Korea) as a safe and effective method for sinus elevation with the advantage of using a reamer (the CAS drill) to perform the osteotomy in a conical shape and break the bony floor; however, only one questionnaire that assessed the satisfaction of dentists using the CAS KIT is available in the literature on this method [5]. Using an inflatable balloon for indirect sinus floor elevation has been shown to be successful in elevating the mucosa for elevation heights of up to 10 mm [6, 7]. However, few studies in the literature compared this technique to others.

Lopez-Nino et al. studied the lamb as an ex vivo model for training in sinus floor elevation and concluded that the model is useful because of the similarities in the thickness of the lateral wall of the maxillary sinus and the thickness of the Schneiderian membrane between the models and the human standards [8].

Cone beam computed tomography (CBCT) can precisely visualize the sinus complexity in 3D, with low irradiation to the patient. In implant dentistry, recent guidelines recommend the use of CBCT for three-dimensional treatment planning, especially prior to SFE for evaluating both residual alveolar and sinus conditions [9, 10].