title: [Effects of progressive loading on implants placed into extraction sockets: a preliminary study].
abstract: OBJECTIVE
  To study the effects of progressive loading on implants placed into extraction sockets.
  
  
  METHODS
  Bilateral 3rd, 4th and 2nd premolar of 4 beagle dogs were extracted and the implants were immediately inserted at 0, 14 and 21 days. The progressive loading procedure was conducted after 24 hours. The vertical bone loss (VBL) and the bone/biomaterials reactions were detected by X-ray and SEM.
  
  
  RESULTS
  The VBL in control groups was larger than that for the experimental groups at 14, 21 and 28 days (P<0.05). Scan electron microscopy detected that the mineralization speed of experimental groups was many times as faster as the control groups.
  
  
  CONCLUSIONS
  Progressive loading of implants placed into extraction sockets can be performed without disturbing the osseointegration process. The potential of new bone formation in the extraction sockets and the physical strains can congenerously promote osseointegration.
authors.affiliation: Key. Laboratory of Oral Biomedi- cal Engineering Ministry of Education, Sichuan University, Chengdu 610041, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Ban
authors.forename: Ping
authors.initials: P
authors.lastname: Gong
authors.forename: Shao-An
authors.initials: SA
authors.lastname: Wang
authors.forename: Xiao-Guang
authors.initials: XG
authors.lastname: Liu
authors.forename: Nin
authors.initials: N
authors.lastname: Geng
authors.forename: Quan
authors.initials: Q
authors.lastname: Yuan
mesh_terms: D000818:Animals; D001641:Bicuspid; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D004285:Dogs; D016348:Osseointegration; D014081:Tooth Extraction; D020390:Tooth Socket
chemical_list: D015921:Dental Implants