Overdenture su barra supportate da impianti a connessione conometrica nel mascellare superiore: studio prospettico a 5 anni

Abstract

Objectives The aim of this study was to evaluate the behaviour of “planned” bar-retained overdentures supported by Morse taper connection implants, in terms of implant success and survival, marginal bone resorption, and prosthetic complications, in the upper jaws of patients with favorable and unfavorable bone conditions. Materials and methods Over a 2-year period, 39 patients (22 males and 17 females) were enrolled in the study. Each overdenture was anchored to a bar supported by 4 implants. A total of 156 Morse taper connection implants were inserted in two groups of patients (Group A, favorable bone conditions: 24 patients, 96 implants; Group B, unfavorable bone conditions: 15 patients, 60 implants). Results were evaluated 5 years later. Treatment was defined as successful when (1) there was no pain, suppuration, or clinically detected mobility; (2) the distance between the implant shoulder and the first crestal bone-implant contact point (DIB) was <2.0 mm; and (3) there was no history of exudate. All prosthetic complications were recorded. Results The overall 5-year implant survival rate was 97.2% (Group A 97.9%; Group B 96.5%). One hundred thirty-six of the surviving implants (94.4%) were classified as implant successes. At the 5-year examination, the mean DIB was 0.78 ± 0.54 mm (Group A 0.78 ± 0.53 mm; Group B 0.77 ± 0.55 mm). Very few prosthetic complications were reported. Conclusions With “planned” bar-retained maxillary overdentures supported by Morse taper connection implants, satisfactory implant survival and implant success rates can be achieved.