Análise fotoelástica da distribuição de tensões peri-implantares em overdenture mandibular retida por implante unitário com diferentes tipos de conexão
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2013-08-14
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Universidade Federal de Goiás
Resumo
For patients poorly adapted to conventional dentures, the single-implant
mandibular overdenture has been proposed as a simplified alternative for the
two-implant treatment, together with the use of immediate loading of the implant.
The aim of this in vitro study was to compare the photoelastic characteristics of
stress transfer to the implant in a single-implant mandibular overdenture using
different types of attachments. A photoelastic model of an edentulous mandible
with a resilient edentulous ridge and a unique implant located at the symphyseal
region was obtained to reproduce a single implant-retained mandibular
overdenture. Six 2.0 mm height attachments were selected and inserted in the
same photoelastic model in a random order. A universal material testing machine
was used to induce axial vertical loads of 70 N applied in the central incisor and
in the central region of the first right molar without contact on the contralateral
side. The photoelastic analysis was performed using a polariscope integrated into
the testing machine. Standard separate views were photographed and evaluated
visually for stress-induced fringes, to comparatively rank the different attachment
systems. All attachments showed a similar tension distribution concentrated in
the apical third, and the highest stress concentration at the apical level. There
was a low stress concentration at the coronal third of the implant, with no
discernible stress in the first threads of the implants, except for Dalla Bona which
showed low stress at the coronal part of the implant (one fringe). No identifiable
fringes were observed when the load was applied in the molar region, which
resulted from the low amount of stress transmitted by the implant for all
attachments. It was concluded that the load transferred to a single mandibular
implant is low and within the limits of functional loading, irrespective of the type of
retention system.
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NASCIMENTO, João Francisco Machado do. Análise fotoelástica da distribuição de tensões peri-implantares em overdenture mandibular retida por implante unitário com diferentes tipos de conexão. 2013. 54 f. Dissertação(Mestrado em Ciências da Saúde (FM)) - Universidade Federal de Goiás, Goiânia, 2013.