Resumo

ARISMENDI ECHAVARRIA, J.A.; GIRALDO, D.H.  e  LOAIZA VALDERRAMA, A.. Mechanical evaluation of external and internal connection titanium implants. Avances en Periodoncia [online]. 2016, vol.28, n.2, pp.59-69. ISSN 2340-3209.

Abstract: The purpose of this study was to compare, in vitro,mechanical strength ofive tlat internal and external hexagonal systems used as dental implants submitted to compressive, flexion and compression-flexion forces. Material and methods: 18 assemblies were used, nine internal hex Renova^® implants (IC) and nine external hex RBM^® implants (EC) (3.75×13 mm). Samples were tested in an Instron^® universal machine. A static progressive load with the sample positioned relative to the axis machine at vertical (0^o), angular (45^o) and horizontal (90^o) positions until deformation occurs. Results: The greatest values for elastic limit load were obtained for a vertical load (0^o) in the IC group (1733.5N) and EC (1619.5N). On the other hand, minimum values were obtained for horizontal load (90^o) in IC and EC with 267N and 226N respectively. The IC group showed more homogeneous results in agreement with the variation coefficient (<20%), meanwhile the EC group showed the greater variation coefficient. Discussion: The IC tends to have higher elastic limit load. Besides, the fractured zones showed different shapes indicating that each system have different responses under load. In that way, this difference could be representative under cyclic load.

Palavras-chave : Dental implants; titanium; internal hex; external hex; biomechanics.

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