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Related Concept Videos

Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

798
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
798
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
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Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins
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Three-dimensional processing deformation of three denture base materials.

Andreas Artopoulos1, Andrzej S Juszczyk, Jose M Rodriguez

  • 1Postgraduate student, Department of Prosthodontics, King's College London Dental Institute, London, UK.

The Journal of Prosthetic Dentistry
|November 6, 2013
PubMed
Summary
This summary is machine-generated.

Urethane dimethacrylate-based resins showed more processing deformation than polymethyl methacrylate-based resins. Denture base material choice and fabrication method impact dimensional accuracy, crucial for complete denture fit and function.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Heat-polymerized polymethyl methacrylate denture bases are prone to deformation during and after polymerization.
  • This processing deformation can negatively impact the clinical performance and fit of complete dentures.

Purpose of the Study:

  • To investigate and quantify the processing deformation of three different denture base materials.
  • To evaluate deformation on a standardized anatomical model using advanced scanning and software analysis.

Main Methods:

  • Four groups of denture bases were fabricated using different materials (polymethyl methacrylate-based, urethane dimethacrylate-based) and techniques (compression molding, injection molding, light-polymerization).
  • A contact scanner and surface-matching software were employed to measure dimensional changes between casts and fabricated denture bases.
  • Statistical analysis (Kruskal-Wallis, Mann-Whitney U) was performed with P<.01 significance level.

Main Results:

  • Significant differences in processing deformation were found between polymethyl methacrylate-based and urethane dimethacrylate-based resins.
  • No significant deformation differences were observed between compression and injection molding techniques for polymethyl methacrylate.
  • Similarly, manual adaptation alone and combined with compression molding showed no significant differences.

Conclusions:

  • Urethane dimethacrylate-based resins exhibited greater processing deformation compared to polymethyl methacrylate-based resins.
  • Compression and injection molding yielded comparable results for polymethyl methacrylate resins.
  • The study highlighted complex deformation patterns exceeding linear measurement accuracy.