title: Marginal bone loss evaluation around immediate non-occlusal microthreaded implants placed in fresh extraction sockets in the maxilla: a 3-year study.
abstract: OBJECTIVE
  To evaluate marginal bone loss over 3 years around immediate microthreaded implants placed in the maxillary anterior/esthetic zone and immediately restored with single crowns.
  
  
  METHODS
  Seventy-one implants (with microthreads up to the platform--rough surface body and neck, internal connection and platform switching) were placed in fresh extraction sockets in the maxillary arches of 30 men and 23 women (mean age 37.85 ± 7.09 years, range 27-60). All subjects had at least 3 mm of soft tissue to allow the establishment of adequate biologic width and to reduce bone resorption. Each patient received a provisional restoration immediately after implant placement with slight occlusal contact. Mesial and distal bone height was evaluated using digital radiography on the day following implant placement (baseline) and after 1, 2, and 3 years. Primary stability was measured with resonance frequency analysis.
  
  
  RESULTS
  No implants failed, resulting in a cumulative survival rate of 100% after 3 years. Marginal bone loss from implant collar to bone crest measured at baseline (peri-implant bone defect at the fresh extraction socket) and after 3 years was 0.86 mm ± 0.29 mm. Mesial and distal site crestal bone loss ranged from 3.42 mm ± 1.2 mm at baseline to 3.51 mm ± 1.5 mm after 3 years (P = 0.063) and from 3.38 mm ± 0.9 mm at baseline to 3.49 mm ± 0.9 mm after 3 years, respectively (P = 0.086).
  
  
  CONCLUSIONS
  This prospective study found minimal marginal bone loss and a 100% implant survival rate over the 3-year follow-up for microthreaded immediate implants subjected to immediate non-occlusal loading.
authors.affiliation: Department of Implant Dentistry, School of Medicine and Dentistry, University of Murcia, Murcia, Spain.|Faculty of Medicine, University of Belgrade, Belgrade, Serbia.
authors.forename: José L
authors.initials: JL
authors.lastname: Calvo-Guirado
authors.affiliation: Department of Pharmacological Research in Dentistry, Dental School, University of Granada, Granada, Spain.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Gómez-Moreno
authors.affiliation: Department of Pharmacological Research in Dentistry, Dental School, University of Granada, Granada, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Aguilar-Salvatierra
authors.affiliation: Department of Pharmacological Research in Dentistry, Dental School, University of Granada, Granada, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Guardia
authors.affiliation: Department of Prosthodontics and Digital Technology, School of Dental Medicine, Stony Brook University, Stony Brook, NY, USA.
authors.forename: Rafael A
authors.initials: RA
authors.lastname: Delgado-Ruiz
authors.affiliation: School of Dental Medicine, Stony Brook University, Stony Brook, NY, USA.
authors.forename: Georgios E
authors.initials: GE
authors.lastname: Romanos
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology*; D003442:Crowns; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging / Q000601:surgery*; D011446:Prospective Studies; D013499:Surface Properties
keywords: dental implants; immediate non-occlusal loading; marginal bone loss; microthread; rough surface neck