title: Mandibular overdentures supported by 6-mm dental implants: a 1-year prospective cohort study.
abstract: BACKGROUND
  The extremely resorbed edentulous mandible, with a bone height of 8 mm or less, is still a challenge in implant dentistry. Recently, dental implants of 6 mm in length have been developed.
  
  
  OBJECTIVE
  The purpose of this 1-year prospective cohort study was to evaluate treatment outcome of mandibular overdentures supported by four 6-mm dental implants.
  
  
  METHODS
  Twelve edentulous patients with a mandibular height between 6 and 8 mm participated. The patients were treated with an overdenture supported by four 6-mm OsseoSpeed dental implants (Astra Tech AB, Mölndal, Sweden). Clinical and radiographic parameters were evaluated 1 year after completion of the prosthetic treatment. Patients' satisfaction was scored before implant surgery and 1 year after prosthetic treatment.
  
  
  RESULTS
  One-year implant survival rate was 96% (two implants were lost). One patient had a fracture of the mandible in the region of one of the implants 3 weeks after implant surgery. Mean scores for plaque, calculus, gingiva, bleeding, and pocket probing depth were low. Patients' satisfaction was high.
  
  
  CONCLUSIONS
  One-year follow-up data revealed that four 6-mm dental implants inserted in an extremely resorbed edentulous mandible provided a solid basis for a bar-retained overdenture.
authors: Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, Groningen, and Center for Dental Implants De Mondhoek, Apeldoorn, the Netherlands.
authors: Felix
authors: F
authors: Guljé
authors: Gerry M
authors: GM
authors: Raghoebar
authors: Jan-Willem P
authors: JW
authors: Ter Meulen
authors: Arjan
authors: A
authors: Vissink
authors: Henny J A
authors: HJ
authors: Meijer
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density / Q000502:physiology; D001862:Bone Resorption / Q000601:surgery; D015331:Cohort Studies; D015921:Dental Implants; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003826:Denture, Complete, Lower; D003828:Denture, Overlay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008337:Mandibular Fractures / Q000209:etiology; D008875:Middle Aged; D009911:Oral Hygiene Index; D017060:Patient Satisfaction; D010512:Periodontal Index; D011183:Postoperative Complications; D011446:Prospective Studies; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants