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Related Experiment Videos

Enamel micro-cracks produced around restorations with flowable composites.

Linlin Han1, Akira Okamoto, Masayoshi Fukushima

  • 1Division of Cariology Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Japan. han4378@ybb.ne.jp

Dental Materials Journal
|May 11, 2005
PubMed
Summary

Polishing dental composite restorations immediately after filling can cause enamel micro-cracks. Waiting to polish and using flowable composites reduces the incidence of these marginal defects.

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials

Background:

  • Dental composite restorations are widely used in clinical practice.
  • Marginal integrity of restorations is crucial for long-term success.
  • Enamel micro-cracks can compromise the seal and longevity of dental restorations.

Purpose of the Study:

  • To investigate the occurrence of enamel micro-cracks around flowable composite restorations.
  • To examine the influence of polymerization shrinkage, composite mobility, and polishing timing on enamel micro-cracks.
  • To compare flowable composites with conventional hybrid composites regarding micro-crack formation.

Main Methods:

  • Utilized stereomicroscopy and scanning confocal laser microscopy (SCLM) to observe enamel micro-cracks.

Related Experiment Videos

  • Evaluated restorations polished immediately after filling versus those polished 15 minutes or 24 hours after filling.
  • Compared micro-crack incidence between flowable and conventional hybrid composite materials.

    • Main Results:

    • Enamel micro-cracks were consistently observed when restorations were polished immediately after placement.
    • Micro-cracks formed parallel to the cavity margin, typically 0.01-0.3 mm away.
    • Higher incidence of enamel micro-cracks occurred with conventional hybrid composites compared to flowable composites.
    • Polishing 15 minutes post-filling resulted in more micro-cracks than polishing 24 hours post-filling.

    Conclusions:

    • Immediate polishing of composite restorations significantly increases the risk of marginal enamel micro-cracks.
    • Delayed polishing (24 hours) and the use of flowable composites are recommended to minimize enamel micro-crack formation.
    • Understanding these factors is vital for improving the clinical success and durability of composite restorations.