Cumulative Success Rate of Short and Ultrashort Implants Supporting Single Crowns in the Posterior Maxilla: A 3-Year Retrospective Study

Abstract EN

Aim.

To determine cumulative success rate (CSR) of short and ultrashort implants in the posterior maxilla restored with single crowns.

Patients and Methods.

We performed a retrospective study in 65 patients with 139 implants.

46 were ultrashort and 93 short.

Implants were placed with a staged approach and restored with single crowns.

Success rate, clinical and radiographic outcomes, and crown-to-implant ratio (CIR) were assessed after three years.

Statistical analysis was performed by descriptive and inferential statistics.

A log-binomial regression model where the main outcome was implant success was achieved.

Coefficients and 95% confidence intervals were reported.

Analyses were performed with Stata 13.2 for Windows.

Results.

61.54% of patients were female and mean overall age was 51.9±11.08 years old.

Overall CSR was 97.1% (95% CI: 92.4–98.9): 97.9 and 95.1% for short and ultrashort, respectively (P value: 0.33).

Four implants failed.

Covariates were not associated with CSR (P value > 0.05).

Regression model showed coefficients correlated with implant success for ultrashort implants (0.87) and most of covariates but none were statistically significant (P values > 0.05).

Conclusions.

Our results suggest that short and ultrashort implants may be successfully placed and restored with single crowns in the resorbed maxillary molar region.