title: Mucosal and radiographic aspects during the healing period of implants placed in a one-stage procedure.
abstract: OBJECTIVE
  The aim of this prospective clinical trial was to compare peri-implant clinical and radiographic parameters following the placement of nonsubmerged two- and one-stage implants.
  
  
  METHODS
  Patients were randomly assigned to the IMZ group (20 patients receiving two IMZ two-stage implants in a one-stage procedure) or ITI group (20 patients receiving two ITI implants in the conventional one-stage procedure). The healing period was defined as an 18-week unloaded osseointegration period and a 1-year functional period during which maturation of bone took place. Twelve weeks after implant placement, fabrication of an overdenture with a bar-clip attachment system was started; it was placed at 18 weeks.
  
  
  RESULTS
  None of the implants were lost during the osseointegration period; one IMZ implant was removed during the functional period because of mobility. There was no significant difference in Gingival Index between the two groups at all evaluation periods. The mean bone loss during the functional period was 0.6 mm in both groups. A high number of healing abutments loosened in the IMZ group.
  
  
  CONCLUSIONS
  Clinical and radiographic parameters of two-stage implants placed in a one-stage procedure and one-stage implants are comparable during the healing period. Healing abutments of the IMZ implant system loosen easily.
authors.affiliation: Department of Oral and Maxillofacial Surgery and Maxillofacial Prosthetics, Groningen University Hospital, The Netherlands. h.j.a.meijer@kchir.azg.nl
authors.forename: Henny J A
authors.initials: HJ
authors.lastname: Meijer
authors.forename: Kees
authors.initials: K
authors.lastname: Heijdenrijk
authors.forename: Gerry M
authors.initials: GM
authors.lastname: Raghoebar
mesh_terms: D016301:Alveolar Bone Loss / Q000145:classification / Q000000981:diagnostic imaging; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D019232:Dental Restoration Failure; D003781:Denture Retention; D003828:Denture, Overlay; D005260:Female; D005884:Gingival Hemorrhage / Q000145:classification; D005889:Gingival Recession / Q000145:classification; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging* / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification; D010519:Periodontium / Q000503:physiopathology*; D011446:Prospective Studies; D011859:Radiography; D014945:Wound Healing / Q000502:physiology
chemical_list: D015921:Dental Implants