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Replantation: Is the Glory Well Deserved?

Avulsed teeth comprise 1-16% of all traumatic injuries of the permanent dentition. Individuals with a greater overjet are known to be more at risk compared with individuals who have a normal overjet. Unfortunately, in these situations, intrepid calculative decisions must often be made quickly, because the loss of a maxillary central incisor classically occurs by accident most commonly in patients with Angles’ Class II division 1 malocclusion. Various long-term solutions considered for avulsed maxillary incisors, especially in patients requiring orthodontic treatment at a later date are considered here along with clinical cases. Trauma often leaves extensive defects rendering the scope of implants almost nil at the concerned area and some round tripping of drifted teeth in the edentulous area can be used as an advantage for orthodontic site development to accept future prosthesis.


INTRODUCTION
The orthodontic practitioner often encounters patients who have traumatically avulsed maxillary central incisors in daily practice. [1][2][3][4][5][6][7] According to American Academy of Pediatric Dentistry, 'Avulsion' is the "complete displacement of a tooth out of it's socket." The periodontal ligament is torn mostly accompanied by alveolar fracture. 8 Of all the traumatic injuries involving permanent dentition, avulsed teeth encompass 1-16%. 9 People having more than normal overjet are known to be at double the risk as compared to those who have a normal overjet. 10,11 Unfortunately, in these situations, certain decisions ought to be made hurriedly as incisor avulsion classically takes place by accident most commonly in these patients. [12][13][14][15] In such a situation, the straightforward and lasting way out considered is to reimplant it, the success depending on tooth root, 14 endodontics performing ability 1 and the time lapsed since avulsion. 16 Complications after replantation are commonly encountered with the prevalence rate being 55% to 85%. 17,18 Also, ankylosis, extreme movement within socket, internal and external resorption might crop up through the next few years. Many of these teeth do not last beyond 5 to 7 years even after a root canal therapy. 1 If avulsed tooth is lost/damaged, autotransplantation can be done in patients with tooth size arch length discrepancy, [19][20][21][22][23][24][25] as typically seen in the Class II cases. Here, a premolar is relocated to the edentulous site, negating the need for premolar camouflage extractions at a later date. However, premolar roots should be formed between one-half and two-thirds. In best possible circumstances, auto-transplantation might be less successful with a surgeon who is not experienced in the procedure.
A third probable resolution is to close the edentulous space by using the ipsilateral lateral incisor as a replacement for the avulsed central. 26 Fourth way out can be the maintenance of the edentulous space by constructing a temporary removable prosthesis to address the patient's immediate functional and esthetic needs, to be Copyright 2017 by Harpreet S. This is an open-access article distributed under Creative Commons Attribution 4.0 international License (CC BY 4.0), which allows to copy, redistribute, remix, transform, and reproduce in any medium or format, even commercially, provided the original work is properly cited.
cc Short Communication restored later by an implant or bridge during adulthood. Evidence suggests that upon extracting teeth in growing patients, although alveolar thickness narrows down from 25% to 30%, perpendicular alveolar height of the edentulous ridge catches up speed with the contiguous erupting teeth. 27 But in these patients with prominent premaxillae, the alveolus does not get the stimulus in missing incisor area for deposition and resorption. Therefore, lateral incisor or the contralateral central incisor has to be moved mesially(or allowed to move by drifting gradually in edentulous space due to pull of the transseptal fibres) such that, it brings about bone remodeling when retracted orthodontically for overjet reduction. Space is reopened after remodeling to accept implant/prosthesis.

CASES
Illustrated here are two examples (Case I and Case II, one of them pursuing Orthododontics as a career). Prior to the proceedings, patients illustrated in Case I: Figure 1 and Case II: Figure 2 signed the consent forms. These patients were, unfortunately, not monitored by the dentist on a regular basis. On a visit to the Orthodontic clinic while seeking alignment of teeth, the reimplanted teeth were found to have ankylosed. These teeth generally do not respond to orthodontic therapy, even after using stronger eruptive forces and luxation. Periapical radiographs show extensive root resorption, no periodontal membrane remaining or periapical lesions and the teeth have to be ultimately extracted. Owing to the deficient incisor, the consequent alveolar defect is extensive which renders this site tough unfavorable for restoration by implants.

DISCUSSION
Reimplanted teeth might ankylose. Evidently, such a tooth does not erupt creating a substantial perpendicular deficiency that magnifies further in a growing patient. Such a defect would not have occurred if this tooth was extracted earlier and treatment plans alternate to reimplantation discussed earlier were implemented.
Although ankylosed roots can be moved upon luxation, they may never erupt due to absence of periodontal ligament. 28 In such patients, distraction of alveolar segments might be a better However, as in Case I with rotated tooth and large periapical lesion, prognosis is poor. The assessment of an alternative for the space in question turns out to be the instantaneous apprehension of the suffering child and his/her family along with the concerned dentist or orthodontist. A classic way out is to construct a temporary removable prosthesis to aid in perking up both aesthetics and function.
A distinct advantage can be obtained at times by leaving the area as such without any immediate replacement. Sometimes, the erupting teeth drift bodily in growing children bringing the al-veolar bone along with. However, in adults, teeth generally tilt or incline towards each other rather than drifting bodily as the growth is complete. In children, various treatment options can be explored by regaining space for inserting an implant or bridge pontic, or substituting the central incisor by a lateral incisor.
Space regainers act by pushing apart the drifted teeth like lateral incisor and contralateral central incisor, resulting in creating fresh alveolar bone in the developing edentulous space with a similar thickness to the root width as surrounding teeth. This process is called orthodontic site development. Evidence suggests that this buccolingual alveolar thickness does not resorb or narrow down. 30 Such sites offer improved bone vertically as well as labiolingually for receiving the final prosthesis. Preserving edentulous space as such during transition from mixed to permanent dentition results in deficient alveolar thickness that might require bone or a softtissue grafting prior to any restoration.

CONCLUSION
Timely supervision and treatment of patients with traumatic avulsion was discussed for guidance in prevention of extensive defects which render the scope of implants almost nil at the concerned area. Some round tripping of drifted teeth in the edentulous area can be used as an advantage for orthodontic site development to accept future prosthesis (Figure 3).