Dynamics of dentoalveolar ankylosis and associated root resorption

Abstract

The present experimental studies in monkeys were undertaken to study the initiation and progression of dentoalveolar ankylosis of replanted teeth and associated root resorption. Maxillary and mandibular lateral incisors were extracted and replanted after an extraoral period of 15 min or 1 h. Teeth with an extraoral period of 1 h were endodontically treated. Half the number of monkeys were given antibiotics at the time of replantation. The observation periods varied from 2 days to 40 weeks. Irrespective of the length of the extraoral period, initial root resorption and minor areas of ankylosis were found 1 week after replantation. The initial ankylosis was not preceded by root resorption. In teeth replanted after an extraoral period of 15 min the ankylotic area did not increase with increasing time after replantation. Instead the periodontal membrane was re-established, separating the root surface from the alveolar bone. In teeth replanted after an extraoral period of 1 h, the initial ankylotic area increased with increasing time after replantation. Eight weeks and more after replantation, most of the periodontal membrane was replaced by bone covered by osteoblasts and occasional osteoblasts that were in continuity with the endosteal cells outlining the marrow spaces of the alveolar bone. The cementum and dentin were then gradually resorbed with increasing time after replantation. Antibiotics given at the time of replantation reduced the initial inflammation in the periodontal membrane and the inflammatory root resorption after all observation periods and it also seemed to some extent to prevent bacteria from entering the necrotic pulp tissue. Based on the present results it is suggested that root resorption associated with dentoalveolar ankylosis is initiated by endosteal osteoblasts and is thus a hormonally regulated process. This is in contrast to inflammatory root resorption, which seems to be triggered by inflammatory cells.

Root and Bone Response to the Proximity of a Mini-Implant under Orthodontic Loading

“…If the PDL barrier is extensively injured and bone grows toward the resorbed root, the PDL cannot protect the root and ankylosis can occur, although ankylosis can have other causes ( Figure 3C). 24 In the root perforation instances, there was root resorption and ankylosis on the side opposite the insertion ( Figure 3H), indicating that insertion pressure on the root can induce root resorption and ankylosis on the opposite side. To avoid root perforation, the path of insertion should be changed if resistance is felt because the root is harder than alveolar bone.…”

Dentists' level of knowledge of the treatment plans for periodontal ligament injuries after dentoalveolar trauma

“…9 The radiographic exam is of paramount importance to complement the diagnosis because it provides information about root formation stage, lesions affecting dental hard tissues (especially the root), periodontal ligament space and the alveolar bone. The results showed that, regardless of the type of injury, radiographic exam was one of the most frequently mentioned components of the treatment plan.…”

Use of vitamin C in delayed tooth replantation

“…One important issue of success in these cases is related to root surface treatment (2)(3)(4). The search for the best clinical protocol for cases of delayed tooth replantation has been a recurrent subject among many researchers (2)(3)(4)(5)(6)(7)(8)(9).…”