Continued root formation of a pulpless permanent incisor following root canal treatment: a case report

Abstract

*Teeth with necrotic pulps and periapical rarefaction may show evidence of continued apical formation after root canal treatment. *Hertwig's epithelial root sheath may be more resistant than expected to trauma and infection.

Regenerative Endodontic Treatment of an Immature Necrotic Molar with Arrested Root Development by Using Recombinant Human Platelet-derived Growth Factor: A Case Report

“…In the present report, the maturation process seems challenged because SCAP are not likely to exist in the apical tissues around the mandibular second molar because of the patient's age. Furthermore, HERS are also unlikely to survive chronic root canal infection ($5 years) that could arrest root development, although HERS might be resistant to chronic inflammation (25,26).…”

Continued Root Formation after Delayed Replantation of an Avulsed Immature Permanent Tooth

“…The first mechanism is the role of root organization of Hertwig's sheath; it is possible that this sheath survived and retained its ability to organize root formation when the inflammatory process was eliminated [34, 35]. …”

Clinical management of a complicated crown-root fracture: a case report

“…Conventional therapy to traumatic dental injuries with wide open apices includes the use of a dressing with a calcium hydroxide paste in an attempt to form a hard tissue apical barrier promoting apexification, and induce more favorable conditions to the conventional endodontic treatment (2,3,5,6,8,10). Literature recommends the therapy with calcium hydroxide in traumatized teeth to reduce the risk of external root resorption, even in teeth with closed apices (2,3,9,14).…”

“…Moreover, several techniques have been developed to induce hard tissue formation and apical closure. Among them, the use of a calcium hydroxide-based paste as an intracanal dressing has been reported to stimulate hard tissue formation and apexification after root canal therapy (6,8).…”