Immediate reimplantation of primary teeth: a histological study in dogs

Abstract

Reimplantation of primary teeth has been the subject of various clinical and histological studies, but very little is known about the effect of this treatment on primary teeth. The aim of the present study was to histologically evaluate the biological response of dog primary teeth after immediate reimplantation. Twelve dogs were divided into two groups according to postoperative time: 1 week and 3 weeks. Twenty-one upper and lower intermediate incisors were extracted and submitted to endodontic treatment, reimplantation and splinting. The 21 homologous teeth not submitted to treatment served as controls. The animals were killed after the respective experimental periods, and the obtained specimens were processed for histological analysis. Most dogs of the 1-week group exhibited the following alterations: gingival epithelium was inserted in the cemento-enamel junction, with a small number of chronic inflammatory cells being observed in the gingival corium; the periodontal ligament was partially reestablished, with a more expressive chronic inflammatory infiltrate being observed in the apical third; small root resorption was observed on the palatine/lingual side in the apical third. In contrast, in 3-week animals, gingival epithelial insertion was predominantly absent on the buccal side, and a moderate chronic inflammatory infiltrate was present; the periodontal ligament generally showed no bone-cementum reinsertion especially on the palatine/lingual side, with an expressive inflammatory infiltrate in the apical region, and large root resorption was mainly observed on the palatine and lingual sides. In conclusion, reimplantation causes histological alterations in the tooth and its supporting periodontal structures that suggest the impossibility of its maintenance.

The Prevalence and Treatment Outcomes of Primary Tooth Injuries

“…Although guidelines do not recommend reimplanting primary teeth, 13 some authors have reported successful cases of reimplantation. 29,30 In deciding whether to attempt reimplantation, the benefits as well as risks to the patient should be weighed carefully, and the tooth should be followed up with closely. In our case, reimplantation was considered appropriate because of the short time between injury and presentation and the fact that the tooth had been stored in milk following injury.…”

Replantation of avulsed primary incisors: a critical review of a controversial treatment

“…A case report on repositioning of two orally displaced teeth with a long‐term follow up showed only a minor hypocalcified area in the enamel of the permanent successors . Moreover, a histological study in dogs showed that removing the blood clot by rinsing the alveolar socket with physiological saline before replantation reduces the risk of damage to the permanent tooth .…”

Critical considerations when planning experimental in vivo studies in dental traumatology

“…However, their intensive bone response to injury makes this model doubtful (1). The most frequent model for avulsion and replantation studies appears to be dogs (9, 25–33) and monkeys with wound‐healing responses similar to humans (14, 15, 17, 34–49).…”