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Subsurface compression fatigue in seven dental composites

L H Mair1

  • 1Department of Clinical Dental Sciences, University of Liverpool, England, UK.

Dental Materials : Official Publication of the Academy of Dental Materials
|March 1, 1994
PubMed
Summary

Subsurface fatigue in dental composites varies by filler size; larger quartz fillers showed more staining, indicating microcracks. Microfilled materials exhibited minimal damage, highlighting differences in composite wear resistance.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Background:

  • Dental composites undergo significant mechanical stress during function.
  • Understanding subsurface fatigue is crucial for predicting material longevity and clinical performance.

Purpose of the Study:

  • To investigate and compare subsurface fatigue patterns in seven different dental composite materials.
  • To correlate filler characteristics with the extent and nature of subsurface damage.

Main Methods:

  • Cylindrical composite specimens were subjected to cyclic compression (2000 cycles at 120 N).
  • Subsurface damage was visualized using silver nitrate staining and quantified by area measurement.
  • Scanning electron microscopy (SEM) was employed to examine crack morphology.

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Main Results:

  • Composites with larger quartz fillers displayed the most extensive silver nitrate staining.
  • Microfilled composites showed significantly less staining, suggesting greater resistance to subsurface damage.
  • SEM analysis revealed a network of crazes and microcracks, not direct cracks from the indenter, consistent with staining patterns.

Conclusions:

  • The type and size of fillers in dental composites influence their subsurface fatigue behavior under compression.
  • Distinct patterns of subsurface damage were observed, emphasizing the need to consider these variations in wear and degradation studies.