Clinical study on survival rate of short implants placed in the posterior mandibular region: resonance frequency analysis.

Queiroz, Thallita P; Aguiar, Samuel C; Margonar, Rogério; de Souza Faloni, Ana P; Gruber, Reinhard; Luvizuto, Eloá R (2015). Clinical study on survival rate of short implants placed in the posterior mandibular region: resonance frequency analysis. Clinical oral implants research, 26(9), pp. 1036-1042. Wiley-Blackwell 10.1111/clr.12394

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Short implants are increasingly used, but there is doubt about their performance being similar to that of regular implants. The aim of this study was to compare the mechanical stability of short implants vs. regular implants placed in the edentulous posterior mandible.


Twenty-three patients received a total of 48 short implants (5 × 5.5 mm and 5 × 7 mm) and 42 regular implants (4 × 10 mm and 4 × 11.5 mm) in the posterior mandible. Patients who received short implants had <10 mm of bone height measured from the bone crest to the outer wall of the mandibular canal. Resonance frequency analysis (RFA) was performed at time intervals T0 (immediately after implant placement), T1 (after 15 days), T2 (after 30 days), T3 (after 60 days), and T4 (after 90 days).


The survival rate after 90 days was 87.5% for the short implants and 100% for regular implants (P < 0.05). There was no significant difference between the implants in time intervals T1, T2, T3, and T4. In T0, the RFA values of 5 × 5.5 implants were higher than values of 5 × 7 and 4 × 11.5 implants (P < 0.05). A total of six short implants that were placed in four patients were lost (three of 5 × 5.5 mm and three of 5 × 7 mm). Three lost implants started with high ISQ values, which progressively decreased. The other three lost implants started with a slightly lower ISQ value, which rose and then began to fall.


Survival rate of short implants after 90 days was lower than that of regular implants. However, short implants may be considered a reasonable alternative for rehabilitation of severely resorbed mandibles with reduced height, to avoid performing bone reconstruction before implant placement. Patients need to be aware of the reduced survival rate compared with regular implants before implant placement to avoid disappointments.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > School of Dental Medicine > Periodontics Research

UniBE Contributor:

Gruber, Reinhard


600 Technology > 610 Medicine & health








Eveline Carmen Schuler

Date Deposited:

30 Oct 2015 15:03

Last Modified:

05 Dec 2022 14:49

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

atrophy, bone resorption, dental implants, mandible, short implants




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