title: Effect of Microthread Design on Marginal Bone Level Around Dental Implants Placed in Fresh Extraction Sockets.
abstract: OBJECTIVE
  This study was designed to compare radiographically the effect of microthread on the coronal portion of the fixture on marginal bone level (MBL) around immediately placed dental implants in human subjects.
  
  
  METHODS
  Forty-one roughened surface screw type Dentium oral implants (Dentium) were inserted in fresh extraction sockets of the anterior segment of maxilla of 30 patients. The implants were selected randomly using either microthread design on coronal portion of the fixture (Implantium) (test group) or without microthread thread design (Superline) (control group). MBL was measured using digital subtraction radiography technique after 3, 6, and 12 months.
  
  
  RESULTS
  At month 3, the microthread groups have been associated with more marginal bone loss than the control group (P = 0.04). At months 6 and 12, both groups had comparable bone levels (P = 0.21).
  
  
  CONCLUSIONS
  The microthread design of the implant collar could not have a positive effect in maintaining the MBL around implants placed in fresh extraction socket in anterior maxilla.
authors.affiliation: *Associate Professor, Department of Periodontics and Implantology, Dental School, Tehran University of Medical Sciences, Tehran, Iran. †Assistant Professor, Department of Periodontics and Implantology, Dental School, Qazvin University of Medical Sciences, Tehran, Iran. ‡Professor, Department of Periodontics and Implantology, Dental School, Tehran University of Medical Sciences, Tehran, Iran. §Associate Professor of Oral and Maxillofacial Surgery, Department of Oral and Maxillofacial Surgery, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Afshin
authors.initials: A
authors.lastname: Khorsand
authors.forename: Amir Alireza
authors.initials: AA
authors.lastname: Rasouli-Ghahroudi
authors.forename: Nima
authors.initials: N
authors.lastname: Naddafpour
authors.forename: Yadollah Soleimani
authors.initials: YS
authors.lastname: Shayesteh
authors.forename: Arash
authors.initials: A
authors.lastname: Khojasteh
mesh_terms: D000328:Adult; D059605:Dental Implant-Abutment Design / Q000379:methods*; D015921:Dental Implants; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading / Q000379:methods*; D008297:Male; D008875:Middle Aged; D020390:Tooth Socket / Q000601:surgery*; D055815:Young Adult
chemical_list: D015921:Dental Implants