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International Journal of Dentistry
Volume 2013, Article ID 194987, 5 pages
Research Article

Analysis of Primary Stability of Dental Implants Inserted in Different Substrates Using the Pullout Test and Insertion Torque

1Department of Dental Materiais and Prosthodontics, University of São Paulo, Av. do Café s/n, 14040-904 Ribeirão Preto, SP, Brazil
2Department of Biomechanics, Medicine and Rehabilitation of the Locomotor, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto, SP, Brazil
3Department of Diagnostic and Surgery, UNESP, R. Humaitá, 1680, 14801-903 Araraquara, SP, Brazil
4Department of Restorative Dentistry, University of São Paulo, Av. do Café s/n, 14040-904 Ribeirão Preto, SP, Brazil

Received 1 August 2012; Revised 6 November 2012; Accepted 7 November 2012

Academic Editor: Francesco Carinci

Copyright © 2013 Nathalia Ferraz Oliscovicz 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.


The aim of the study was to evaluate mechanical behavior of implants inserted in three substrates, by measuring the pullout strength and the relative stiffness. 32 implants (Master Porous-Conexao, cylindrical, external hexagon, and surface treatment) were divided into 4 groups ( ): pig rib bone, polyurethane Synbone, polyurethane Nacional 40 PCF, and pinus wood. Implants were installed with the exact distance of 5 mm of another implant. The insertion torque (N·cm) was quantified using the digital Kratos torque meter and the pullout test (N) was performed by an axial traction force toward the long axis of the implant (2 min/mm) through mount implant devices attached to a piece adapted to a load cell of 200 Kg of a universal testing machine (Emic DL10000). Data of insertion torque and maximum pullout force were submitted to one-way ANOVA and Bonferroni tests ( ). Polyurethane Nacional 40 PCF and pinus wood showed the highest values of insertion torque and pullout force, with significant statistical difference ( ) with other groups. The analysis showed stiffness materials with the highest values for primary stability.