Long-term marginal bone loss in 217 machined-surface implants placed in 68 patients with 5 to 9 years of follow-up: a retrospective study.
OBJECTIVE
The aim of the present study was to evaluate marginal bone loss (mBL) adjacent to dental implants with a machined surface with at least 5 years of function.


METHODS
Machined-surface implants with a minimum follow-up of 5 years were included in the study. Recorded clinical parameters included plaque and gingival bleeding indices, smoking habit (nonsmoker, 0 to 10 cigarettes/day, or more than 10 cigarettes/day), presence of periodontal disease (healthy or periodontally compromised), and compliance with periodontal maintenance. Marginal bone loss (mBL) was assessed radiographically around the implants using the long-cone parallel technique.


RESULTS
Sixty-eight participants who received 217 implants were included in the study. No late failures occurred. The mean duration of follow-up was 6.7 years (range, 5 to 9 years). The mean mBL after 5 to 9 years was 0.43 threads (± 1.12 threads) (0.26 mm). Thirteen implants (6.0%) showed a mBL of at least three threads. Multiple linear regression (R2 = 0.229) showed that implants in patients with poor periodontal maintenance and implants placed in periodontally compromised patients were significantly associated with greater mBL (P < .005). Female gender and follow-up time were also associated with greater mBL.


CONCLUSIONS
Limited long-term mBL was associated with machined-surface implants. Regular periodontal maintenance visits every 3 to 6 months, especially in periodontally compromised patients, have to be considered paramount to maintain peri-implant bone levels over the long term.
Faculty of Dentistry, University of Barcelona, Spain.
Javier
J
Mir-Mari
Pedro
P
Mir-Orfila
Eduard
E
Valmaseda-Castellón
Cosme
C
Gay-Escoda
D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D015921:Dental Implants / Q000009:adverse effects*; D003773:Dental Plaque / Q000150:complications; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D010510:Periodontal Diseases / Q000150:complications; D011859:Radiography; D012189:Retrospective Studies; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D013997:Time Factors
D015921:Dental Implants