title: Removal of dental implant displaced into maxillary sinus by combination of endoscopically assisted and bone repositioning techniques: a case report.
abstract: BACKGROUND
  Accidental displacement of a dental implant into the maxillary sinus is an infrequent although not uncommon complication encountered in dental clinical practice, with the main cause thought to be inadequate bone height in the posterior maxilla. We report a case of migration of a dental implant into the maxillary sinus, and discuss the benefits of its removal by a combination of endoscopically assisted and bone repositioning techniques.
  
  
  METHODS
  A 35-year-old Japanese man with a partially edentulous maxilla underwent implant placement at a private clinic. Three months later, at the time of abutment connection, the implant at the site of his maxillary right first molar was accidentally pushed into the sinus. The hole on the alveolar ridge made for placement of the implant was small and far from the dislocated implant, thus access was achieved in a transoral manner via the frontal wall of his maxillary sinus with an endoscopic approach. Piezoelectric instruments were used to perform an osteotomy. The bone lid was removed, and the implant was identified using a rigid endoscope and removed with a surgical aspirator, followed by repositioning of the bony segment; the area was secured with an absorbable suture. Removal of migrated implants should be considered in order to prevent possible sinusal disease complications.
  
  
  CONCLUSIONS
  In the present case, removal of a dental implant displaced into the maxillary sinus by use of a combination of endoscopically assisted and bone repositioning techniques proved to be a safe and reliable procedure.
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. s-nogami@dent.tohoku.ac.jp.
authors.forename: Shinnosuke
authors.initials: S
authors.lastname: Nogami
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. yamaken@dent.tohoku.ac.jp.
authors.forename: Kensuke
authors.initials: K
authors.lastname: Yamauchi
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. tanuma@dent.tohoku.ac.jp.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Tanuma
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. k.oda6928@gmail.com.
authors.forename: Kenji
authors.initials: K
authors.lastname: Odashima
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. aritsune@dent.tohoku.ac.jp.
authors.forename: Aritsune
authors.initials: A
authors.lastname: Matsui
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. kenkou-tanaka@dent.tohoku.ac.jp.
authors.forename: Kenko
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Medicine and Surgery, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Miyagi, Japan. tetsu@dent.tohoku.ac.jp.
authors.forename: Tetsu
authors.initials: T
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D016025:Bone Transplantation / Q000295:instrumentation / Q000379:methods*; D003758:Dental Implantation, Endosseous / Q000009:adverse effects*; D015921:Dental Implants / Q000009:adverse effects*; D004724:Endoscopy; D005548:Foreign-Body Migration / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants