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Volume 27 , Issue 2
March/April 2012

Pages 346-351

Evaluation of Implant-Abutment Microgap and Bacterial Leakage in Five External-Hex Implant Systems: An In Vitro Study

Eduardo Cludio Lopes de Chaves e Mello Dias, DDS, MSc/Edecir Dcio Cargnin Bisognin, DDS, MSc/Nassim David Harari, DDS, MSc, PhD/Slvio Jorge Machado, BBM/Cristiano Pereira da Silva, DDS, MSc/Glria Dulce de Almeida Soares, Eng, MSc, PhD/Guaracilei Maciel Vidigal Jr, DDS, MSc, PhD

PMID: 22442774

Purpose: The aim of the present study was to verify the presence of a microgap between implants and prosthetic abutments on their external surfaces in five different external-hex implant systems and to determine whether bacterial leakage occurs through the implant-abutment (I-A) interface. Materials and Methods: Ten samples of each implant system were used. Eight samples of each implant system were inoculated with 0.3 L of a suspension of Escherichia coli for bacterial leakage evaluation. Two other samples were used as controls. Sample analysis was accomplished at 24 and 48 hours and on the 5th, 7th, and 14th day after inoculation. After microbiologic analysis, all samples were prepared for I-A interface evaluation by scanning electron microscopy. The mean of the microgap misfit was obtained from six points at 1,000 and 3,000 magnifications. Results: The Neodent implant system (0.51 0.39 m) showed the closest adaptation, followed by Dentoflex (1.44 0.73 m), Titanium Fix (1.88 1.28 m), SIN (2.46 3.38 m), and Conexo (2.68 3.02 m). Twenty-five percent of the Dentoflex samples showed bacterial leakage through the I-A interface; no other implant system presented bacterial leakage. Conclusion: The width of the microgap at the I-A interface was less than 3 m in all systems. A direct correlation between bacterial leakage and I-A interface misfit was not observed. Int J Oral Maxillofac Implants 2012;27:346351

Key words: dental implant, microbial leakage, misfit

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