Evaluation of patient and implant characteristics as potential prognostic factors for oral implant failures.
Artikel i vetenskaplig tidskrift, 2005

PURPOSE: The purpose of this study was to evaluate patient, implant, and treatment characteristics to identify possible prognostic factors for implant failure. MATERIALS AND METHODS: Out of a database with different dental implant treatment protocols, a research database of 1 randomly selected implant per patient was created. The database consisted of 487 implants. Of these, 80 were withdrawn, 36 failed, and 371 remained successful during a 5-year follow-up period. Potential risk factors were evaluated by chi-square tests and post hoc analyses. RESULTS: Significant or strongly significant differences were found regarding implant failures as a result of jawbone quality, jaw shape, implant length, treatment protocol, and combinations of jawbone-related characteristics. Responsible clinics and number of implants supporting the restoration were factors that could not be associated with implant failure. DISCUSSION: Implant failures in this study were more often seen when negative patient-related factors were present. Approximately 65% of the patients with a combination of the 2 most negative bone-related factors (jawbone quality 4 and jaw shape D or E) experienced implant failure. However, only 3% of the patients had this combination. Implant length, the only implant-related factor evaluated, was also significantly correlated with the success rate, but implant length could also be regarded as a result of the jawbone volume available. Another negative patient-related factor was the treatment protocol; however, in most cases this was also indirectly or partly related to the status of the jawbone available for implant placement. CONCLUSION: Patient selection appears to be of importance for increasing implant success rates.


statistics & numerical data

Follow-Up Studies

Sex Factors

Dental Prosthesis Design

Risk Factors

Dental Restoration Failure



Clinical Protocols


Prospective Studies


Middle Aged


Treatment Outcome

Dental Implants

Surface Properties

Bone Density

Patient Selection

Age Factors



Irene Herrmann

Göteborgs universitet

Ulf Lekholm

Göteborgs universitet

Sture Holm

Chalmers, Matematiska vetenskaper, Matematisk statistik

Göteborgs universitet

Christina Kultje

International Journal of Oral and Maxillofacial Implants

0882-2786 (ISSN)

Vol. 20 2 220-30





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