This study aims to find the best way to use your own healthy wisdom tooth to replace the bad tooth. After transplantation, how to manage the "tooth nerve" (dental pulp) inside the tooth is a key question. Currently, doctors have three different management strategies, but it is not clear which one is most beneficial for long-term success.
This study will compare these three strategies:
Performing standard root canal treatment (removing the tooth nerve) a few weeks after transplantation.
Performing a special procedure to treat and fill the root tip during the transplant surgery, followed by root canal treatment later.
Simply trimming the root tip during the transplant surgery, hoping to preserve the vitality of the tooth nerve and thereby avoid subsequent root canal treatment.
If you agree to participate, you will be randomly assigned to one of these groups to receive treatment. Afterwards, we will need to schedule regular check-ups for you over a period of 5 years (including X-rays and examinations) to monitor the healing of the transplanted tooth, check for any problems, and assess the status of the tooth nerve.
Your participation will help us identify the most effective and long-lasting treatment method, thereby benefiting future patients in similar situations.
Aged 18-40 years.
Requires extraction of a non-restorable first or second molar AND possesses a fully developed, morphologically healthy ipsilateral third molar as a donor tooth.
Willing and able to provide written informed consent.
Presence of acute infection or insufficient bone volume at the recipient site.
Donor tooth exhibits caries, periapical pathology, or periodontal disease.
Uncontrolled systemic disease (e.g., diabetes, immunosuppression), pregnancy, or lactation.
Inability or unwillingness to comply with the long-term follow-up schedule.
Parallel
Postoperative Root Canal Therapy
Procedure/SurgeryThis intervention involves the standard non-surgical root canal treatment of the autotransplanted tooth. It is performed after the surgical transplantation procedure, typically initiated within 2-4 weeks postoperatively. The procedure includes pulp extirpation, biomechanical preparation, disinfection, and obturation of the root canal system using standard techniques and materials (e.g., gutta-percha and sealer).
Intraoperative Apical Surgery with Retrograde Filling
Procedure/SurgeryThis surgical intervention is performed on the donor tooth during the transplantation procedure, while the tooth is outside the mouth (ex vivo). It consists of: 1) Resection of approximately 3mm of the root apex; 2) Preparation of a retrograde cavity at the resected apex; and 3) Obturation of this cavity with a biocompatible material, such as Mineral Trioxide Aggregate (MTA), to achieve a seal. This is followed by postoperative root canal therapy (as described in Intervention 1).
Intraoperative Root-End Resection
Procedure/SurgeryThis surgical intervention is performed on the donor tooth during the transplantation procedure, while the tooth is outside the mouth (ex vivo). It involves the resection of approximately 3mm of the root apex only, with the aim of enlarging the apical foramen. Crucially, no retrograde preparation or filling is performed. Postoperatively, no prophylactic (preventive) root canal therapy is planned. The goal is to promote revascularization and survival of the pulp. Remedial root canal therapy is provided only if clinical or radiographic signs of pulp necrosis or apical periodontitis develop during follow-up.
Success Rate
Comprehensive success defined as the transplanted tooth being present, functional, asymptomatic (no pain on percussion, no sinus tract), with healthy gingiva, and no radiographic evidence of progressive inflammatory root resorption or periapical radiolucency.
Survival Rate
The proportion of transplanted teeth remaining in the oral cavity and functional.
Incidence of Inflammatory Root Resorption
The proportion of transplanted teeth exhibiting radiographic signs of inflammatory root resorption (periapical radiolucency adjacent to the root surface with loss of lamina dura) on periapical radiograph or CBCT.
Pulp Revascularization/Survival (RER Group)
Assessment of pulp vitality via clinical tests (electric pulp test, cold test) in the RER group.
Radiographic Periodontal Ligament Healing
Evaluation of the uniformity, continuity, and width of the periodontal ligament space on periapical radiographs/CBCT at specified intervals, and detection of ankylosis.
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This trial is not recruiting at the moment. You can still explore other options:
