title: Implant over implant: an alternative method for solving malpositioned osseointegrated implants at the sinus floor.
abstract: An implant was malpositioned and osseointegrated at the maxillary sinus floor with no complications. However, unexpected bone formation over the implant made the implant nonfunctional. Because the patient rejected the removal of the implant, it was left in place while another short implant was placed into the newly formed bone in approximately the same position as the old implant to restore the posterior maxillary tooth. Within 6 months, the new implant over the old asymptomatic implant was functional. Radiographs revealed osseointegration and stable periimplant marginal bone level with no signs of infection or inflammation.
authors.affiliation: Chair, Department of Oral Implantology, West China Hospital of Stomatology, Associate Professor, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Chengdu, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Man
authors.affiliation: Postgraduate student, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Chengdu, PR China.
authors.forename: Tianlu
authors.initials: T
authors.lastname: Wang
authors.affiliation: Professor, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Chengdu, PR China.
authors.forename: Anchun
authors.initials: A
authors.lastname: Mo
authors.affiliation: Associate Professor, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Chengdu, PR China. Electronic address: qqyili@gmail.com.
authors.forename: Yili
authors.initials: Y
authors.lastname: Qu
mesh_terms: D000328:Adult; D054893:Cone-Beam Computed Tomography / Q000379:methods; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants / Q000009:adverse effects; D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000628:therapy; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008443:Maxillary Sinus / Q000473:pathology; D016348:Osseointegration / Q000502:physiology*; D010012:Osteogenesis / Q000502:physiology; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods; D059546:Sinus Floor Augmentation / Q000009:adverse effects
chemical_list: D015921:Dental Implants