Partial tooth formation diagnosed eight years after an extraction of the maxillary third molar germ in a complete crown formation stadium: A case report.

INTRODUCTION: Orthodontic purposes, such as the prevention of anterior crowding, are common and controversial indications for surgical removal of the third molar (M3) germ in young patients. A higher tooth bud position and the risk of tooth displacement in the infratemporal fossa when surgery of the maxillary M3 germ is planned makes the success of germectomy unlikely with little benefit. A rare complication of maxillary M3 germ surgery is partial tooth building after germectomy. PRESENTATION OF CASE: We report the case of a 14-year-old patient who was referred for germectomy of the maxillary M3 in the early development germ stadium to address space constraints and obstruction to the eruption of the second molar (M2) teeth. Computed tomography (CT) examination was used to verify the position and development of the maxillary M3 germ. The surgical procedure was performed without any complications. Eight years after the surgery, the patient presented with indefinable pain in the right upper jaw in the germectomy area. Cone-beam CT revealed a partial tooth formation in the form of a radix relict in the region of the maxillary M3. DISCUSSION: The ongoing debate surrounding germectomy revolves around its indications and timing, considering factors such as patient age, anatomical appearance, and root formation stage. Complications, like partial tooth formation postgermectomy, highlight the importance of precise timing in treatment. CONCLUSION: This is the first report of partial tooth formation as a complication after germectomy of the M3 germ in a complete crown-formation stadium.

Bone remodeling of the sinus floor observed 19 years after third molar transplantation to close a maxillary defect: a case report.

Autologous tooth transplantation is the transplantation of an erupted, partially erupted, or unerupted tooth from one site to another in an individual. This is expected to maintain alveolar bone volume through physiological stimulation of the periodontal ligament (PDL). Tooth transplantation can be used for the closure of oroantral communication. As a simple, useful, and minimally invasive method, it should be considered a surgical option when a donor tooth is available in indicated cases. Herein, the authors report the case of a 20-year-old female patient whose left permanent maxillary first molar had to be extracted due to a longitudinal fracture and radicular cyst in the maxillary sinus floor. After the extraction, tooth 28 was exposed through an osteotomy and positioned in the gap. Nineteen years later, the autologous grafted tooth 28 could no longer be retained due to massive external resorption and was replaced by an implant. Human PDL stem cells can differentiate into bone-, fiber-, and cementum-forming cells and have the potential to build a PDL complex. Therefore, care must be taken to avoid damaging the PDL of the donor tooth during extraction. Autotransplanted teeth are expected to retain the alveolar bone volume. This case demonstrates the use of a transplanted tooth 28 for the treatment of a maxillary defect caused by the extraction of tooth 26 and removal of a radicular cyst. External resorption and regeneration of the bone of the maxillary sinus floor around the transplanted tooth occurred after 19 years.