Strain Gauge: study of strain distributions around three Morse taper prosthetic connections with offset positioning in machined and plastic copings under vertical load

Authors

  • Vivian Mayumi Miyazaki Santos Faculdade de Odontologia de São José dos Campos
  • Talitha de Cássia Silva Sousa Faculdade de Odontologia de São José dos Campos - UNESP
  • Frederico Freire Louzada Faculdade de Odontologia de São José dos Campos
  • Gabriela Nogueira de Melo Nishioka Faculdade de Odontologia de Araraquara
  • Renato Sussumu Nishioka Faculdade de Odontologia de São José dos Campos

DOI:

https://doi.org/10.14295/bds.2012.v15i3.823

Abstract

The aim of this study was to evaluate through strain gauge the strain distribution occurred around 3 Morse taper implants with positioning offset, by varying the types of copings: plastic and machined. Microunit prosthetic abutments were connected onto the implant platforms. Ten frameworks composed of 3 copings were casted in cobalt-chromium alloy as single block (Co-Cr). Half of the copings were machined (n=5) and half were made of plastics (n=5). Four strain gauges were placed into the polyurethane block tangential to the 3 implants. The frameworks were fixed at their respective sites with the aid of a retaining screw with torque of 20 N.cm, achieve with a mechanical torquemeter. The vertical load of 30 Kg was applied through a spherical point of 2 mm diameter for 10 s, onto each one of the 3 screws of the framework through a device for load application The records of the strain reading were submitted to ANOVA and Tukey tests (5%). There were statistically significant differences (p=0.0174) between the coping type used (machined and plastic). The micro strain mean values were: point C at the machined coping 282.5 ?m (±120.8), point B at the machined coping 229.5 ?m (±76.1), point A at the machined coping 209.8 ?m (±55.0), point C at the plastic coping 155.0 ?m (±30.5), point B at the plastic coping 146.2 ?m (±25.8) and point A at the plastic coping 130.36 ?m (±21.83). It was concluded that there was a significant difference between the coping types, once the plastic coping exerted smaller micro strain on Morse taper implants than the machined copings.

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Published

2012-12-18

How to Cite

1.
Santos VMM, Sousa T de CS, Louzada FF, Nishioka GN de M, Nishioka RS. Strain Gauge: study of strain distributions around three Morse taper prosthetic connections with offset positioning in machined and plastic copings under vertical load. BDS [Internet]. 2012 Dec. 18 [cited 2025 Aug. 21];15(3):50-5. Available from: https://ojs.ict.unesp.br/index.php/cob/article/view/823

Issue

Section

Clinical or Laboratorial Research

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