title: Maxillary overdentures supported by anteriorly or posteriorly placed implants opposed by a natural dentition in the mandible: a 1-year prospective case series study.
abstract: BACKGROUND
  For maxillary overdenture therapy, treatment guidelines are missing. There is a need for longitudinal studies.
  
  
  OBJECTIVE
  The purpose of this 1-year prospective case series study was to assess the treatment outcome of maxillary overdentures supported by six dental implants opposed by natural antagonistic teeth in the mandible.
  
  
  METHODS
  Fifty patients were treated with a maxillary overdenture supported by six dental implants, either placed in the anterior region (n = 25 patients) or in the posterior region (n = 25 patients). Items of evaluation were the following: survival of implants, condition of hard and soft peri-implant tissues, and patients' satisfaction.
  
  
  RESULTS
  One-year implant survival rate was 98% in the anterior group and 99.3% in the posterior group. Mean radiographic bone loss in the anterior and posterior groups after 1 year of loading was 0.22 and 0.50 mm, respectively. Mean scores for plaque, calculus, gingiva, bleeding, and pocket probing depth were low, and patients' satisfaction was high, with no differences between the groups.
  
  
  CONCLUSIONS
  Six dental implants placed in either the anterior region or the posterior region of the edentulous maxilla, connected with a bar, and opposed by antagonistic teeth in the mandible supply a proper base for the support of an overdenture.
authors.affiliation: Research associate, Department of Fixed and Removable Prosthodontics, Dental School, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands Professor, Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands Professor, Department of Fixed and Removable Prosthodontics, Dental School, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
authors.forename: Wim
authors.initials: W
authors.lastname: Slot
authors.forename: Gerry M
authors.initials: GM
authors.lastname: Raghoebar
authors.forename: Arjan
authors.initials: A
authors.lastname: Vissink
authors.forename: Henny J A
authors.initials: HJ
authors.lastname: Meijer
mesh_terms: D000328:Adult; D000368:Aged; D015921:Dental Implants; D003817:Dentition; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D008437:Maxilla; D008875:Middle Aged; D011446:Prospective Studies; D011862:Radiography, Panoramic
chemical_list: D015921:Dental Implants