title: Does a large dehiscent implant surface at placement affect the 5-year treatment outcome? An assessment of implants placed to support a maxillary overdenture.
abstract: The aim of this study was to assess the 5-year clinical and radiographic outcome of implants with a dehiscent surface at implant placement. A total of 26 consecutive patients (mean age 61.6 years; SD 8.0 years) with at least one implant with a dehiscent implant surface of ≥ two thirds of the implant length on the labial side were included. All implants were placed to support a maxillary overdenture. The implants were placed with adequate primary stability and the dehiscent surface was covered with autologous bone, inorganic bovine bone and a resorbable membrane. Outcome measures were soft tissue conditions, change of radiographic marginal bone level and implant survival. Baseline data (at loading, T0) were compared with 1-year (T1) and 5-year (T5) post loading data. Of the 116 implants, 40 implants had no dehiscence, 16 had a buccal dehiscence < two thirds of the implant length, and 60 implants had a dehiscence ≥ two thirds. The peri-implant tissues were healthy and 5-year marginal bone changes were well within normal limits (-0.4 mm; range: -0.8 to -0.1). One implant was lost during the osseointegration period. Even when implants are placed with a dehiscence ≥ two thirds of the buccal implant surface, favorable 5-year peri-implant health can be achieved provided these dehiscences are covered with autologous bone, inorganic bone and a resorbable membrane, and there is good initial stability of the implants.
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Oral and Maxillofacial Surgery, Groningen, The Netherlands. Electronic address: g.c.boven@umcg.nl.
authors.forename: G C
authors.initials: GC
authors.lastname: Boven
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Oral and Maxillofacial Surgery, Groningen, The Netherlands; University of Groningen, University Medical Center Groningen, Dental School, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands.
authors.forename: H J A
authors.initials: HJ
authors.lastname: Meijer
authors.affiliation: University of Groningen, University Medical Center Groningen, Dental School, Department of Fixed and Removable Prosthodontics, Groningen, The Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Slot
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Oral and Maxillofacial Surgery, Groningen, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Vissink
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Oral and Maxillofacial Surgery, Groningen, The Netherlands.
authors.forename: G M
authors.initials: GM
authors.lastname: Raghoebar
mesh_terms: D000368:Aged; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods; D003828:Denture, Overlay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D011861:Radiography, Dental; D016896:Treatment Outcome
keywords: Dehiscence; Dental implant; Implant surface; Maxilla; Treatment outcome