[Comparison of the effect of grinding and bone chiseling maxillary sinus internal lifting in dentition defects of posterior teeth with insufficient vertical bone mass].

PURPOSE: To compare the effect of grinding and bone chiseling maxillary sinus internal lifting in dentition defects of posterior teeth with insufficient vertical bone mass.

METHODS: A total of 92 patients with dentition defects in the posterior teeth area due to insufficient vertical bone mass admitted from January 2020 to December 2021 were selected and divided into the control group (n=46) and the experimental group (n=46) by random number table method. The control group was treated with maxillary sinus floor internal lifting via grinding, while the experimental group was treated with maxillary sinus floor internal lifting via bone chiseling. The operative conditions, bone resorption, residual bone height (RBH), implant success rate, peri-implant soft tissue, patient's satisfaction and postoperative complications were compared between the two groups.

RESULTS: There was no significant difference in implant length and diameter between the two groups (P＞0.05). The operation time in the experimental group was significantly longer than in the control group (P＜0.05), and the amount of intraoperative blood loss was significantly higher than in the control group(P＜0.05). One year after surgery, there were no significant differences in probing depth (PD), gingival papillary index, modified sulcular bleeding index (mSBI) and modified plaque index (mPLI) between the two groups (P＞0.05), the satisfaction rate of patients in the experimental group was significantly higher than that in the control group (P＜0.05), and there was no significant difference in the total incidence of complications between the two groups(P＞0.05). Three years after surgery, the bone resorption amounts at the root, distal and near midedge of the implants in both groups increased significantly(P＜0.05), and more prominent in the experimental group (P＜0.05). RBH in both groups increased significantly(P＜0.05), and more prominent in the experimental group (P＜0.05). There was no significant difference in the success rate of the implants between the two groups(P＞0.05).

CONCLUSIONS: Internal lifting of the maxillary sinus by grinding and bone chiseling has good effect in dentition defects of posterior teeth with insufficient vertical bone mass and has a relatively small impact on the soft tissues around the implants. Internal maxillary sinus lifting with bone chisel can promote bone tissue absorption, increase RBH, and improve patients' satisfaction, with increased intraoperative trauma.