title: Effect of microthread on the maintenance of marginal bone level: a 3-year prospective study.
abstract: OBJECTIVE
  The purpose of the present study was to evaluate the long-term effect of the microthread on the maintenance of marginal bone level.
  
  
  METHODS
  Seventeen patients were selected and two types of Astra Tech implants were installed, with the Microthread on the coronal portion of the fixture [Astra Tech Single Tooth Implant (ST)] or without the Microthread [Astra Tech TiOblast Implant (TB)]. ST and TB were installed adjacent to each other within the same partially edentulous sites and marginal bone loss was evaluated by radiographic image. The marginal bone-level alteration of the each fixture after prosthesis insertion was analyzed.
  
  
  RESULTS
  The marginal bone loss of ST and TB differed significantly during the observation period (P<0.01). Marginal bone levels of both ST and TB were stabilized after 1 year of lading.
  
  
  CONCLUSIONS
  The Microthread might have an effect in maintaining the marginal bone loss against loading.
authors: Department of Periodontology, Yongdong Severance Hospital, College of Dentistry, Yonsei University, Seoul, Korea.
authors: Dong-Won
authors: DW
authors: Lee
authors: Young-Shill
authors: YS
authors: Choi
authors: Kwang-Ho
authors: KH
authors: Park
authors: Chang-Sung
authors: CS
authors: Kim
authors: Ik-Sang
authors: IS
authors: Moon
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology / Q000517:prevention & control*; D003758:Dental Implantation, Endosseous; D019250:Dental Implants, Single-Tooth / Q000009:adverse effects; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D033081:Shear Strength; D018709:Statistics, Nonparametric