The Cochrane review of of materials for retrograde root filling identified 6 RCTs all at high risk of bias. The trials provide insufficient evidence to draw any conclusion as to the benefits of any one material over another so more high quality studies are needed.
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20 RCTs are included in this Cochrane review update of endodontic retreatment. The available evidence is of low quality so further research is needed to understand the effects of surgical versus non-surgical approaches, and to determine which surgical procedures provide the best results.
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This new review of root canal retreatment indirectly compares the outcomes of two approaches, non-surgical retreatment and microsurgery. Only 4 of the studies were RCTs but these did not involve direct comparison of the two approaches. Pooled success rates suggest better outcomes for the microsurgical approach.
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