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Related Experiment Videos

Shear bond strength with increasing light-guide distance from dentin.

Xiaoming Xu1, Dant A Sandras, John O Burgess

  • 1Department of Operative Dentistry and Biomaterials, Louisiana State University Health Sciences Center School of Dentistry, New Orleans 70119, USA. xxu@lsuhsc.edu

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|January 24, 2006
PubMed
Summary

For deep Class II composite restorations, increasing curing time to 40-60 seconds compensates for reduced light intensity at greater distances. This ensures optimal resin composite bond strength and polymerization, crucial for durable dental work.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Restorative Dentistry

Background:

  • Class II composite restorations require adequate curing of adhesives in deep preparations, often 2-8 mm from the light source.
  • Typical 10-second curing times may be insufficient for proper polymerization at these distances.

Purpose of the Study:

  • To evaluate dentin bond strengths of resin composite with varying curing light guide distances.
  • To investigate the relationship between radiant exposure, degree of conversion, and shear bond strength.

Main Methods:

  • Single Bond adhesive was applied to dentin, followed by curing with a quartz-tungsten-halogen light at distances of 0-6.9 mm for 20, 40, or 60 seconds.
  • Z100 resin composite was polymerized, and shear bond strengths were tested after 24-hour water storage.

Related Experiment Videos

  • Irradiance, degree of conversion, and bond strength data were analyzed.

    • Main Results:

    • Dentin shear bond strengths significantly decreased as curing distance increased.
    • Increasing curing time to 40 or 60 seconds significantly improved bond strengths.
    • A linear correlation was found between shear bond strength, degree of conversion, and the logarithm of radiant exposure.

    Conclusions:

    • Extended curing times (40-60 seconds) can effectively compensate for reduced irradiance caused by increased distance in deep cavity preparations.
    • Optimal polymerization and bond strength in deep Class II composite restorations are achieved by increasing curing time with quartz-tungsten-halogen lights.