Abstract
The purpose of the retrospective study was to investigate the long-term result of implant-induced injury on the adjacent tooth. The subjects of this retrospective study were patients who had received implants and had tooth injury; direct invasion of root (group I), root surface contact (group II), or < 1 mm distance of the implant from the root (group III). Clinical and pathological changes were periodically examined using radiographs and intra-oral examinations. Paired t-tests and chi-square tests were used to evaluate the implant stability quotient (ISQ) of implant and tooth complications, respectively (α = 0.05). A total of 32 implants and teeth in 28 patients were observed for average 122.7 (± 31.7, minimum 86) months. Seven teeth, three of which were subsequently extracted, needed root canal treatment. Finally, 90.6% of the injured teeth remained functional. Complications were significant and varied according to the group, with group I showing higher events than the others. The ISQs increased significantly. One implant in group I resulted in osseointegration failure. The implant survival rate was 96.9%. In conclusion, it was found even when a tooth is injured by an implant, immediate extraction is unnecessary, and the osseointegration of the invading implant is also predictable.
Highlights
To determine the clinical prognosis of tooth-implant injury, reports of orthodontic miniscrew on the effect of tooth-screw injury can be cited
Because they are blindly placed in the inter-radicular space, trauma to natural teeth can be a major cause of failure
Despite clarity on the prognosis of tooth injury with a miniscrew, from animal studies, it remains unclear whether these results can be applied to dental implants invading adjacent human teeth[22]
Summary
To determine the clinical prognosis of tooth-implant injury, reports of orthodontic miniscrew on the effect of tooth-screw injury can be cited. The impinged teeth remained intact and did not require extraction Another retrospective study reported 1.5% iatrogenic injury to roots during intermaxillary fixation for mandibular fractures. In a prospective study of 68 teeth in 17 patients, Ahmed et al.[14] intentionally injured premolars using a temporary skeletal anchorage device, scheduling them for extraction They presented the repair process of injury in histological sections, showing that 70% of all premolars exhibited good cementum repair. Despite clarity on the prognosis of tooth injury with a miniscrew, from animal studies, it remains unclear whether these results can be applied to dental implants invading adjacent human teeth[22]. The long-term results of clinical studies on tooth injury by dental implants are still unknown, except for Rubenstein and Taylor’s23 10-year followup case report on patient with apical nerve transection. It is not easy to determine whether to extract the damaged tooth or to remove invading implants
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