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Retrograde root filling with dentin-bonded modified resin composite
1Dental Clinic, University Hospital Copenhagen, Denmark.
Journal of Endodontics
|September 1, 1996
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.
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.
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.