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.