• Zhenzhen Liu, Chunyan Li, Jing Zhou, Xiaolin Sun, Xue Li, Manlin Qi, and Yanmin Zhou.
• Department of Oral Implantology, School and Hospital of Stomatology, Jilin University, Changchun.
• Medicine (Baltimore). 2018 Apr 1; 97 (17): e0608.

RationaleIn this case study, a modified transcrestal approach was applied to the patient of extremely atrophic posterior maxilla. We analysis the Implant Stability Quotient values (ISQ) to monitor implant stability, and the cone-beam computer tomography (CBCT) to evaluate the bone regeneration.Patient ConcernA 26-year-old female patient visited our hospital with no contraindications for dental implants and a loss of the maxillary right first molar.DiagnoseExamination by CBCT demonstrated the posterior maxilla was extremely atrophic, the residual bone height (RBH) of #16 was 3.5 mm.InterventionPatient underwent a endoscopically controlled flapless sinus floor elevation. The maxillary sinus membrane was elevated by two-step, and an implant of 12 mm length was placed simultaneously.OutcomesTwelve weeks post-surgery, the implant-level impression was finished and a full-ceramic crown was placed thereafter.LessonsThe modified transcrestal approach can be applied to augment maxillary sinus with a residual bone height less than 4 mm.

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