Comparative Analysis of Survival Rate and Marginal Bone Loss of Dental Implants with One- or Two-Stage Maxillary Sinus Augmentation by Lateral Window Approach: 5-Year Retrospective Study.

Purpose: To compare survival rates and the marginal bone loss (MBL) of implants placed in patients with one-stage or two-stage maxillary sinus augmentation via the lateral window approach (MSALW) using only deproteinized bovine bone mineral (DBBM).

Materials and methods: The dental records and radiologic data of patients who had implants placed with MSALW were collected. The patients were divided according to the one-stage and two-stage MSALW, and the survival rate of each group was measured using the Kaplan-Meier method. The MBL of each group was measured through periapical radiographs at each defined time period. Statistical analysis of the differences between groups was conducted through the log-rank test and one-way analysis of variance (ANOVA). Univariate and multivariate regression tests wereperformed to analyze the degree of influence the interested variables had on the implant survival rate.

Results: There was no significant difference in the 5-year cumulative survival rates between the one-stage and two-stage MSALW at the implant level (91.0% and 90.6%, respectively; P = .201) or at the patient level (89.7% and 89.7%, respectively; P = .330). There was a slight difference in MBL at the initial time point, but there was no significant difference for the total period (P = .289). Diabetes was found to have a negative effect on implant survival (P = .015; hazard ratio [HR] = 3.669).

Conclusions: There was no significant difference in the 5-year cumulative survival rate or the 2-year MBL of implants between the one-stage and two-stage MSALW using DBBM.