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Related Experiment Videos

Retrograde root filling with dentin-bonded modified resin composite

J Rud1, V Rud, E C Munksgaard

  • 1Dental Clinic, University Hospital Copenhagen, Denmark.

Journal of Endodontics
|September 1, 1996
PubMed
Summary

The modified Retroplast resin composite, now using ytterbium trifluoride instead of silver, shows comparable initial healing rates for retrograde root-end fillings. Long-term evaluation reveals significantly improved healing outcomes over time.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Restorative Dentistry

Background:

  • Retrograde root-end fillings utilize resin composites for sealing.
  • Early formulations of Retroplast contained silver, impacting stability and aesthetics.
  • Silver was replaced with ytterbium trifluoride to mitigate adverse effects.

Purpose of the Study:

  • To compare clinical outcomes of silver-containing and ytterbium trifluoride-containing Retroplast.
  • To evaluate long-term radiographic healing after retrograde root-end filling.

Main Methods:

  • Retrospective analysis of 351 retrograde root-end fillings.
  • Comparison of radiographic healing at 1 year and 2-4 years post-surgery.
  • Utilized Retroplast with silver and modified Retroplast with ytterbium trifluoride.

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Main Results:

  • Initial 1-year healing rates were similar for both composites (approx. 80-82% complete healing).
  • Long-term (2-4 years) evaluation showed significantly improved healing for the ytterbium trifluoride group (89% complete healing).
  • Failure rates were 6% at 1 year and 9% long-term for the modified composite.

Conclusions:

  • Ytterbium trifluoride effectively replaced silver in Retroplast, eliminating side effects.
  • Long-term assessment demonstrates superior healing outcomes with the modified composite.
  • Projected 90% complete healing and 10% failure rate with long-term follow-up.