Abstract：Objective To investigate the clinical application effect of modified micro fenestration in lower maxillary sinus floor elevation. Methods From January 2015 to September 2019, 30 patients admitted to the oral implantology department of our hospital were selected as the research subjects (70 implantation sites, the remaining alveolar bone height below the maxillary sinus measured by cone beam CT was 1-3 mm). Patients were randomly assigned to the experimental group (15 cases) and the control group (15 cases). The experimental group used modified micro fenestration to elevate the maxillary sinus floor, and the control group used conventional micro fenestration to elevate the maxillary sinus floor. Guided bone regeneration technology was applied in both groups after Bio-Oss bone powder was implanted at either the same period or at different periods. The diameter and area of open windows, operation time, post-operation pain, time of maxillary sinus bottom mucosa dissection and bone meal filling, degree of pain and facial swelling on 3 and 7 days after operation, bone height at the bottom of the maxillary sinus before and after operation, and the width of coronal bone around the sinus floor implants after operation were compared between the two groups. Results The diameter and area of the open windows in the experimental group were smaller than those in the control group, and the differences were statistically significant (P＜0.05). There was no statistically significant difference in the operation time between the two groups (P＞0.05). In the process of bone window opening, the time used in the experimental group was shorter than that in the control group, and the difference was statistically significant (P＜0.01). In the process of maxillary sinus bottom mucosa dissection and bone meal filling, the time used in the experimental group was longer than that in the control group, and the difference was statistically significant (P＜0.01). There was no statistically significant difference in the degree of pain between the two groups at 3 and 7 days after operation (P＞0.05). The degree of facial swelling in the experimental group was lower than that in the control group at 3 days after operation, with statistically significant difference (P＜0.05). The bone height at the bottom of the maxillary sinus after operation in the two groups was higher than that before operation, with statistically significant difference (P＜0.05). There was no significant difference in the width of coronal bone around the sinus floor implants between the two groups immediately after operation and 6 months after operation(P＞0.05). Conclusion For the patients with severe alveolar bone atrophy in the maxillary molar area, the application of modified micro fenestration maxillary sinus floor elevation surgery can effectively increase bone height in the maxillary molar area, reduce the incidence risk of surgical complications.
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