title: Failure rates of mini-implants placed in the infrazygomatic region.
abstract: BACKGROUND
  The purpose of this pilot study was to evaluate the failure rates of mini-implants placed in the infrazygomatic region and to evaluate factors that affect their stability.
  
  
  METHODS
  A retrospective cohort study of 30 consecutive patients (55 mini-implants) who had infrazygomatic mini-implants at a University Clinic were evaluated for failure rates. Patient, mini-implant, orthodontic, surgical, and mini-implant maintenance factors were evaluated by univariate logistic regression models for association to failure rates.
  
  
  RESULTS
  A 21.8 % failure rate of mini-implants placed in the infazygomatic region was observed. None of the predictor variables were significantly associated with higher or lower odds for failed implants.
  
  
  CONCLUSIONS
  Failure rates for infrazygomatic mini-implants were slightly higher than those reported in other maxilla-mandibular osseous locations. No predictor variables were found to be associated to the failure rates.
authors.affiliation: Division of Orthodontics, Department of Craniofacial Sciences, Charles Burstone Professor, University of Connecticut School of Dental Medicine, 263 Farmington Avenue, Farmington, CT, 06030, USA. Furibe@uchc.edu.
authors.forename: Flavio
authors.initials: F
authors.lastname: Uribe
authors.affiliation: Private Practice, Houston, TX, USA.
authors.forename: Rana
authors.initials: R
authors.lastname: Mehr
authors.affiliation: Private Practice, Mumbai, India.
authors.forename: Ajay
authors.initials: A
authors.lastname: Mathur
authors.affiliation: Division of Orthodontics, Department of Craniofacial Sciences, University of Connecticut School of Dental Medicine, Farmington, CT, USA.
authors.forename: Nandakumar
authors.initials: N
authors.lastname: Janakiraman
authors.affiliation: Department of Orthodontics, College of Dentistry, The University of Iowa, Iowa, IA, USA.
authors.forename: Veerasathpurush
authors.initials: V
authors.lastname: Allareddy
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D015331:Cohort Studies; D015921:Dental Implants; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008904:Miniaturization; D009910:Oral Hygiene; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D050793:Orthodontic Extrusion / Q000295:instrumentation; D010865:Pilot Projects; D012189:Retrospective Studies; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques / Q000295:instrumentation; D055815:Young Adult; D015050:Zygoma
chemical_list: D015921:Dental Implants
keywords: Failure rate; Infrazygomatic mini-implants; Stability