Original Article
Clinical study on survival rate of short implants placed in the posterior mandibular region: resonance frequency analysis
Thallita P. Queiroz,
Samuel C. Aguiar,
Rogério Margonar,
Ana P. de Souza Faloni,
Reinhard Gruber,
Eloá R. Luvizuto,
Corresponding Author
Thallita P. Queiroz
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Corresponding author:
Thallita P. Queiroz
Av. José Bonifácio, 128, CEP:14801-150
Araraquara, SP, Brazil
Tel./Fax: +55 16 3335-3603
e-mail: [email protected]
Search for more papers by this authorSamuel C. Aguiar
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorRogério Margonar
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorAna P. de Souza Faloni
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorReinhard Gruber
Laboratory of Oral Cell Biology, School of Dental Medicine, University of Bern, Bern, Switzerland
Search for more papers by this authorEloá R. Luvizuto
Department of Surgery and Integrated Clinic, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Araçatuba, Brazil
Search for more papers by this authorThallita P. Queiroz,
Samuel C. Aguiar,
Rogério Margonar,
Ana P. de Souza Faloni,
Reinhard Gruber,
Eloá R. Luvizuto,
Corresponding Author
Thallita P. Queiroz
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Corresponding author:
Thallita P. Queiroz
Av. José Bonifácio, 128, CEP:14801-150
Araraquara, SP, Brazil
Tel./Fax: +55 16 3335-3603
e-mail: [email protected]
Search for more papers by this authorSamuel C. Aguiar
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorRogério Margonar
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorAna P. de Souza Faloni
Department of Health Sciences, Implantology Post Graduation Course, Dental School, University Center of Araraquara – UNIARA, São Paulo, Brazil
Search for more papers by this authorReinhard Gruber
Laboratory of Oral Cell Biology, School of Dental Medicine, University of Bern, Bern, Switzerland
Search for more papers by this authorEloá R. Luvizuto
Department of Surgery and Integrated Clinic, Araçatuba Dental School, UNESP-Univ Estadual Paulista, Araçatuba, Brazil
Search for more papers by this authorAbstract
Objective
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.
Material and methods
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).
Results
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.
Conclusions
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.
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