2022 年 43 巻 1 号 p. 28-36
Abstract : Purpose : It has been reported that the cause of persistent apical periodontitis is residual infected tissue and debris in uninstrumented areas where chemomechanical root canal preparation is ineffective. When applying a high-frequency current, the current density rises at the tip of the electrode, generating Joule heat. In this case report, high-frequency conduction (HFC) was applied to sterilize and detoxify infectious substances in the extraradicular uninstrumented areas.
Cases : HFC was performed on two cases in which inflammation of apical periodontal tissue did not disappear despite appropriate chemomechanical root canal preparation. As a result, we observed reduction in bone defects followed by bone regeneration.
Discussion : Since the inflammation was eliminated by applying HFC to the extraradicular uninstrumented areas such as the external root surface and the inside of the apical lesion, it is considered that the infection in the areas was the cause of the intractability.
Conclusion : It is suggested that HFC is useful as a minimally invasive nonsurgical endodontic treatment that can approach uninstrumented areas.
