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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
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Gap size and wall lesion development next to composite.

N K Kuper1, N J M Opdam2, J L Ruben2

  • 1College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Medical Center, the Netherlands Nicolien.Kuper@radboudumc.nl.

Journal of Dental Research
|May 8, 2014
PubMed
Summary

This study found no link between dental composite gap size and dentin wall lesion depth. Clinically relevant thresholds for gap size could not be established in this investigation.

Keywords:
Transversal Wavelength Independent Microradiographycomposite resin restorationslesion depthmineral lossrecurrent cariessecondary caries

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Area of Science:

  • Dental Materials Science
  • Cariology
  • Restorative Dentistry

Background:

  • Dental composite restorations can develop gaps at the tooth interface.
  • These gaps may influence secondary caries (lesion) development.
  • Understanding the relationship between gap size and lesion formation is crucial for clinical practice.

Purpose of the Study:

  • To investigate the relationship between dental composite gap size and dentin wall lesion development.
  • To determine if a clinically relevant threshold for gap size exists.
  • To compare lesion development adjacent to two different composite materials.

Main Methods:

  • An in situ study design was employed with human dentin samples.
  • Samples featured interfaces with varying gap sizes (50-400 µm) and a non-bonded control.
  • Caries development was induced using a sucrose solution, and lesion depth/mineral loss were quantified using transversal wavelength-independent microradiography (T-WIM).

Main Results:

  • No statistically significant relationship was found between corrected lesion depth and gap size.
  • None of the tested gap sizes showed significant differences in lesion depth.
  • No significant differences in lesion depth or mineral loss were observed between the two composite materials (AP-X and Filtek Supreme).

Conclusions:

  • The study could not establish a minimum gap size threshold for wall lesion development.
  • Wall lesion development was not observed at non-bonded interfaces without a measurable gap.
  • Composite material type did not significantly influence lesion development in this in situ model.