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Periapical neural changes after pulpectomy

¹Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor 48109-1078, USA.

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics

|December 1, 1995

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Pulpectomy and pulpal necrosis cause nerve damage and inflammation, leading to disorganized nerve growth around the tooth root. Even with treatment, nerve changes persist, though organized regrowth may occur with modern root canal therapy.

Area of Science:

Endodontics
Neuroscience
Oral Biology

Background:

Pulpectomy and pulpal necrosis sever nerves supplying the tooth pulp.
Inflammation often extends to the periapical region, affecting these nerves.
This neural and inflammatory response disrupts the normal periodontal plexus.

Purpose of the Study:

To investigate the neural and inflammatory responses following pulpal loss and endodontic treatment.
To characterize the changes in periapical innervation after pulpectomy and root canal therapy.

Main Methods:

Histological examination of periapical tissues following pulpal necrosis and treatment.
Evaluation of neural responses, including axonal sprouting and plexus organization.
Assessment of the effects of debridement, obturation, and steroid treatment on neural changes.

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Main Results:

Pulpal loss and periapical inflammation lead to disorganized axonal sprouting resembling neuromas.
These neural and inflammatory responses persist for at least a year post-treatment.
Steroids reduce but do not eliminate these responses.
Root canal therapy, even without residual inflammation, results in increased, organized periapical innervation.

Conclusions:

Pulpal necrosis triggers persistent, complex neural and inflammatory responses in the periapical region.
While root canal therapy mitigates some effects, significant neural alterations remain.
Modern endodontic techniques may promote organized regeneration of the periradicular plexus.