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Reflection photoelasticity: a new method for studies of clinical mechanics in prosthetic dentistry

Fernandes, CP; Glantz, POJ; Svensson, SA and Bergmark, Anders LU (2003) In Dental Materials 19(2). p.106-117
Abstract
Objectives. This research was conducted to demonstrate the effectiveness of reflective photoelasticity as an in vivo technique for monitoring the strain/stress distribution in prosthetic devices during function. Methods. Seven subjects were selected for this study and divided into three groups according to the design of the prostheses. The buccal surfaces of the experimental prostheses were coated with a birefringent resin 2 mm thick. Using a reflection polariscope, fringe patterns were documented on video tape during standardized in vivo loadings. Strain and stress levels (gamma(max) and tau(max)) were calculated from isochromatic fringe order determinations. The intra-observer variability in counting fringe orders and the accuracy level... (More)
Objectives. This research was conducted to demonstrate the effectiveness of reflective photoelasticity as an in vivo technique for monitoring the strain/stress distribution in prosthetic devices during function. Methods. Seven subjects were selected for this study and divided into three groups according to the design of the prostheses. The buccal surfaces of the experimental prostheses were coated with a birefringent resin 2 mm thick. Using a reflection polariscope, fringe patterns were documented on video tape during standardized in vivo loadings. Strain and stress levels (gamma(max) and tau(max)) were calculated from isochromatic fringe order determinations. The intra-observer variability in counting fringe orders and the accuracy level of reflective photoelasticity as compared to strain gauge results were also studied. The strain results of in vivo loading of the prostheses were analyzed with ANOVA and Scheffes tests. The intra-observer variability was analyzed with the Friedman nonparametric test. Comparisons of photoelastic data and strain gauges were tested with Pearson's correlation. Results. Coated areas accessible to normally incident light, produced comprehensive maps of strain distribution. Significant differences were found in the in vivo gamma(max) values for the prostheses designs (p < 0.05). The test for intra-observer variability showed that no significant differences occurred in counting fringe orders. Strain values obtained with reflective photoelasticity showed a high correlation r = 0.98 and 0.99) with values obtained at the same areas using strain gauges. Significance. Reflective photoelasticity is a valid, reliable and accurate technique to be used for in vivo studies on the biomechanical behavior of prosthetic devices. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
RPD design, in vivo, conical crowns, stress, strain, biomechanics, photoelasticity
in
Dental Materials
volume
19
issue
2
pages
106 - 117
publisher
Elsevier
external identifiers
  • wos:000181024800005
  • pmid:12543116
  • scopus:0038315420
ISSN
0109-5641
DOI
10.1016/S0109-5641(02)00019-2
language
English
LU publication?
yes
id
c329d0a3-4205-42e3-8606-e806d765c2b6 (old id 318279)
date added to LUP
2007-09-03 08:01:15
date last changed
2018-01-07 06:08:30
@article{c329d0a3-4205-42e3-8606-e806d765c2b6,
  abstract     = {Objectives. This research was conducted to demonstrate the effectiveness of reflective photoelasticity as an in vivo technique for monitoring the strain/stress distribution in prosthetic devices during function. Methods. Seven subjects were selected for this study and divided into three groups according to the design of the prostheses. The buccal surfaces of the experimental prostheses were coated with a birefringent resin 2 mm thick. Using a reflection polariscope, fringe patterns were documented on video tape during standardized in vivo loadings. Strain and stress levels (gamma(max) and tau(max)) were calculated from isochromatic fringe order determinations. The intra-observer variability in counting fringe orders and the accuracy level of reflective photoelasticity as compared to strain gauge results were also studied. The strain results of in vivo loading of the prostheses were analyzed with ANOVA and Scheffes tests. The intra-observer variability was analyzed with the Friedman nonparametric test. Comparisons of photoelastic data and strain gauges were tested with Pearson's correlation. Results. Coated areas accessible to normally incident light, produced comprehensive maps of strain distribution. Significant differences were found in the in vivo gamma(max) values for the prostheses designs (p &lt; 0.05). The test for intra-observer variability showed that no significant differences occurred in counting fringe orders. Strain values obtained with reflective photoelasticity showed a high correlation r = 0.98 and 0.99) with values obtained at the same areas using strain gauges. Significance. Reflective photoelasticity is a valid, reliable and accurate technique to be used for in vivo studies on the biomechanical behavior of prosthetic devices. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.},
  author       = {Fernandes, CP and Glantz, POJ and Svensson, SA and Bergmark, Anders},
  issn         = {0109-5641},
  keyword      = {RPD design,in vivo,conical crowns,stress,strain,biomechanics,photoelasticity},
  language     = {eng},
  number       = {2},
  pages        = {106--117},
  publisher    = {Elsevier},
  series       = {Dental Materials},
  title        = {Reflection photoelasticity: a new method for studies of clinical mechanics in prosthetic dentistry},
  url          = {http://dx.doi.org/10.1016/S0109-5641(02)00019-2},
  volume       = {19},
  year         = {2003},
}