title: An accuracy study of computer-planned implant placement in the augmented maxilla using osteosynthesis screws.
abstract: Previous research on the accuracy of flapless implant placement of virtually planned implants in the augmented maxilla revealed unfavourable discrepancies between implant planning and placement. By using the osteosynthesis screws placed during the augmentation procedure, the surgical template could be optimally stabilized. The purpose of this study was to validate this method by evaluating its clinically relevant accuracy. Twelve consecutive fully edentulous patients with extreme resorption of the maxilla were treated with a bone augmentation procedure. Virtual implant planning was performed and a surgical template was manufactured. Subsequently, six implants were installed using the surgical template, which was only supported by the osteosynthesis screws. Implant deviations between planning and placement were calculated. A total of 72 implants were installed. Mean deviations found in the mesiodistal direction were 0.817mm at the implant tip and 0.528mm at the implant shoulder. The angular deviation was 2.924°. In the buccolingual direction, a deviation of 1.038mm was registered at the implant tip and 0.633mm at the implant shoulder. The angular deviation was 3.440°. This study showed that implant placement in the augmented maxilla using a surgical template supported by osteosynthesis screws is accurate.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. Electronic address: Luc.Verhamme@radboudumc.nl.
authors.forename: L M
authors.initials: LM
authors.lastname: Verhamme
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Department of Implantology and Periodontology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: G J
authors.initials: GJ
authors.lastname: Meijer
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Soehardi
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: S J
authors.initials: SJ
authors.lastname: Bergé
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: T
authors.initials: T
authors.lastname: Xi
authors.affiliation: Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: T J J
authors.initials: TJJ
authors.lastname: Maal
mesh_terms: D000368:Aged; D000540:Alveolar Ridge Augmentation; D001863:Bone Screws; D017076:Computer-Aided Design; D054893:Cone-Beam Computed Tomography; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008875:Middle Aged; D009066:Mouth, Edentulous / Q000534:rehabilitation; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: CAD/CAM technology; accuracy; atrophic maxilla; computer-assisted; cone beam computed tomography; edentulous maxilla; flapless implant surgery; implant planning; osteosynthesis screws; sinus floor elevation; surgical guides