title: Radiographic evaluation of marginal bone level around internal-hex implants with switched platform: a clinical case report series.
abstract: OBJECTIVE
  The purpose of this retrospective investigation was to evaluate the influence on the adjacent cervical bone of moving the implant-abutment microgap inward from the outer edge of an internal-hex implant platform (ie, a platform-switched configuration).
  
  
  METHODS
  A convenience sample of 26 patients received 42 Frialit-2 (Dentsply-Friadent) implants for single tooth replacement and were divided into two groups. One group followed the original protocol (control group), and the other (study group) received narrower replaceable components. Follow-up time varied between 6 and 60 months (mean, 33.45 months).
  
  
  RESULTS
  The control group showed noticeable bone remodeling (mean bone loss = 2.30 mm), and all the remodeled crests were apical to the implant platform. In contrast, all patients in the study (platform-switched) group showed stable levels (mean bone loss = 0.27) of the peri-implant crestal bone, coronal to the implant platform.
  
  
  CONCLUSIONS
  The relocation of the implant-abutment microgap through platform switching with Frialit-2 System implants seems to be an effective means to minimize marginal bone loss in all circumstances employed.
authors.affiliation: Department of Implant Dentistry, Veiga de Almeida University, Rio de Janeiro, Brazil. fernandoalmeida94@gmail.com
authors.forename: Fernando Duarte
authors.initials: FD
authors.lastname: de Almeida
authors.forename: Antônio Carlos Pires
authors.initials: AC
authors.lastname: Carvalho
authors.forename: Marcelo
authors.initials: M
authors.lastname: Fontes
authors.forename: Antonio
authors.initials: A
authors.lastname: Pedrosa
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Costa
authors.forename: José Wilson
authors.initials: JW
authors.lastname: Noleto
authors.forename: Carlos Fernando de Almeida Barros
authors.initials: CF
authors.lastname: Mourão
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology / Q000517:prevention & control*; D000539:Alveolar Process / Q000000981:diagnostic imaging; D016723:Bone Remodeling; D000044:Dental Abutments / Q000009:adverse effects*; D003758:Dental Implantation, Endosseous / Q000295:instrumentation* / Q000379:methods; D015921:Dental Implants / Q000009:adverse effects*; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects / Q000295:instrumentation*; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies
chemical_list: D015921:Dental Implants