A 5-year prospective multicenter study on 1-stage smooth-surface Brånemark System implants with early loading in edentulous mandibles.
OBJECTIVE
The purpose of the current prospective multicenter study was to evaluate the 5-year implant success and peri-implant conditions of smooth-surface Brånemark System implants when using a novel technique including a 1-stage surgical procedure with early loading in edentulous mandibles.


METHODS
The study protocol included 1-stage surgery as well as placement of the definitive prosthesis within 6 weeks after implant insertion (ie, early loading). Clinical evaluation, as well as evaluation of function and esthetics, was performed at each follow-up visit. Radiographs were obtained at connection of the prostheses and at the 1, 3-, and 5-year check-ups.


RESULTS
A total of 40 patients with a mean age of 56 years (range, 30 to 70) were included in the study. In all, 170 implants were placed in between the mental foramina, of which 120 implants in 30 patients were associated with overdenture treatment and 50 implants in 10 patients with fixed complete dentures. Twelve implants failed in 6 patients. The cumulative implant survival rate was 92.9% after both 1 and 5 years of follow-up. Another 3 implants were recorded as mobile but still in function when individually checked at the 5-year visit, which resulted in a cumulative success rate of 91.0%. Mean bone remodeling over the study period was less than 0.1 mm/y after the first year of loading, resulting in a mean marginal bone level of 0.66 mm (SD 0.73, n = 138) apical to the implant collar reference point after 5 years.


CONCLUSIONS
One-stage, early loaded smooth-surface Brånemark System implants functioned well for the majority of patients with edentulous mandibles. Stable peri-implant conditions were observed. Bone remodeling resulted in a mean bone level above the first implant thread after 5 years. The somewhat lower success rate of 91.0% compared to a 2-stage procedure may be related to generous inclusion criteria and to a learning curve involving a novel treatment procedure.
Friberg
Bertil
B
Clinic of Odontology, Brånemark Clinic, Public Dental Health, Göteborg, Sweden. bertil.friberg@vgregion.se
Raghoebar
Gerry M
GM
Grunert
Ingrid
I
Hobkirk
John A
JA
Tepper
Gabor
G
D000328:Adult; D000368:Aged; D016723:Bone Remodeling; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D003775:Dental Polishing; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003826:Denture, Complete, Lower; D003828:Denture, Overlay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation*; D015993:Life Tables; D008297:Male; D008334:Mandible; D008875:Middle Aged; D011446:Prospective Studies; D013499:Surface Properties
D015921:Dental Implants