title: Abutment height influences the effect of platform switching on peri-implant marginal bone loss.
abstract: OBJECTIVE
  The purpose was to radiographically analyze and compare the marginal bone loss (MBL) between implants with different mismatching distance and to study the influence of the prosthetic abutment height on the MBL in association with the related mismatching distances.
  
  
  METHODS
  This retrospective study included 108 patients in whom 228 implants were placed, 180 with diameter of 4.5 mm and 48 with diameter of 5 mm. All patients received OsseoSpeed™ implants with internal tapered conical connection (Denstply Implants). Different mismatching distances were obtained, given that all implants were loaded with the same uni-abutment type (Lilac; Denstply Implants). Data were gathered on age, gender, bone substratum, smoking habits, previous history of periodontitis, and prosthetic features. MBL was analyzed radiographically at 6 and 18 months post-loading.
  
  
  RESULTS
  Mixed linear analysis of mesial and distal MBL values yielded significant effects of abutment, implant diameter, follow-up period, bone substratum, smoking, and abutment × time interaction. MBL was greater at 18 vs. 6 months, for short vs. long abutments, for grafted vs. pristine bone, for a heavier smoking habit, and for implants with a diameter of 5.0 vs. 4.5 mm.
  
  
  CONCLUSIONS
  Greater mismatching does not minimize the MBL; abutment height, smoking habit, and bone substratum may play a role in the MBL over the short- and medium term.
authors: Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain.
authors: Pablo
authors: P
authors: Galindo-Moreno
authors: Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain.
authors: Ana
authors: A
authors: León-Cano
authors: Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, USA.
authors: Alberto
authors: A
authors: Monje
authors: Oral Surgery and Implant Dentistry Department, School of Dentistry, University of Granada, Granada, Spain.
authors: Inmaculada
authors: I
authors: Ortega-Oller
authors: Department of Pathology, School of Medicine & IBIMER, University of Granada, Granada, Spain.
authors: Francisco
authors: F
authors: O'Valle
authors: Department of Experimental Psychology, School of Psychology, University of Granada, Granada, Spain.
authors: Andrés
authors: A
authors: Catena
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D059605:Dental Implant-Abutment Design; D003758:Dental Implantation, Endosseous / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome
keywords: alveolar bone loss; dental implant and dental implant-abutment connection; peri-implantitis