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BioMed Research International
Volume 2017 (2017), Article ID 6825213, 11 pages
Clinical Study

Implant Stability in the Posterior Maxilla: A Controlled Clinical Trial

1Department of Oral Surgery, Faculty of Dental Medicine, University of Porto, Rua Manuel Pereira da Silva, 4200-393 Porto, Portugal
2Department of Biomaterials, Faculty of Dental Medicine, University of Porto, Rua Manuel Pereira da Silva, 4200-393 Porto, Portugal
3Mathematics Research Center, Statistics, Modulation and Computer Applications Office, Faculty of Sciences and Mathematics, University of Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal

Correspondence should be addressed to Raquel Zita Gomes

Received 1 April 2017; Revised 26 April 2017; Accepted 3 May 2017; Published 25 May 2017

Academic Editor: Francesco Guido Mangano

Copyright © 2017 Raquel Zita Gomes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aim. To evaluate the primary and secondary stability of implants in the posterior maxilla. Methods. Patients were allocated into three groups: (A) native bone, (B) partially regenerated bone, and (C) nearly totally regenerated bone. Insertion torque (IT) and implant stability quotient (ISQ) were measured at placement, to evaluate whether satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60) was achieved; ISQ was measured 15, 30, 45, and 60 days after placement, to investigate the evolution to secondary stability. Results. 133 implants (Anyridge®, Megagen) were installed in 59 patients: 55 fixtures were placed in Group A, 57 in Group B, and 21 in Group C. Fifty-two implants had satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60). A positive correlation was found between all variables (IT, ISQ at t = 0, t = 60), and statistically higher IT and ISQ values were found for implants with satisfactory high primary stability. Significant differences were found for IT and ISQ between the groups (A, B, and C); however, no drops were reported in the median ISQ values during the healing period. Conclusions. The evaluation of the primary and secondary implant stability may contribute to higher implant survival/success rates in critical areas, such as the regenerated posterior maxilla. The present study is registered in the ISRCTN registry with ID ISRCTN33469250.