Sinus floor elevation (SFA) and GBR have been applied in the placement of dental implants in longstanding edentate posterior maxilla region. However, the number of study on the efficacy of these procedure on areas with 0mm bone height is limited. This case study aims to compare two cases of 0mm bone height in the posterior maxillae region with different handling procedure. In this article, two female patients in their 40s underwent maxillary sinus augmentation (sinus lifting) due to longstanding missing posterior maxillary molars with the bone of which area had resorbed entirely, leaving 0mm bone height. One patient went through conventional sinus augmentation while the other had a two-stage - sinus - lift procedure. Researchers compared the bone - volume induced between the two procedures.

Inclusion Criteria:

• 0mm bone height at posterior maxillae region

Exclusion Criteria:

• general contraindication to implant surgery
• subjected to irradiation in the head and neck area <1 one year before implantation
• uncontrolled diabetes
• pregnant or nursing
• substance abuse
• heavy smoker
• psychiatric therapy or unrealistic expectations
• immunosuppressed or immunocompromised
• treated or under treatment with oral or intravenous aminobisphosphonates
• untreated periodontitis
• poor oral hygiene and motivation