title: Clinical and radiological evaluation of implants placed with osteotome sinus lift technique: 19-month follow-up.
abstract: OBJECTIVE
  Implant placement in the posterior region of the maxilla might be problematic due to poor regional bone quality. The aim of this study was to clinically and radiologically evaluate implants which were placed in the posterior region of the maxilla (with insufficient bone height) with osteotome sinus lift technique after 19-month follow-up.
  
  
  METHODS
  Twenty-four patients with posterior maxillary alveolar height ranging from 5 to 8 mm were chosen for this prospective study. After breaking of the cortical bony sinus floor, sufficient bone substitute was placed, and sinus floor was elevated. In this way, a new sinus floor was created, which was designated for further implants placement. Fifty implants were placed immediately after osteotomy sinus lift technique. The mean clinical and radiological follow-up period was 19 months (with a range of 14-24 months). Success factors such as the absence of mobility, pain, infection, and the amount of crestal bone loss were determined in this study. For data analyzing, Kruskal-Wallis and Mann-Whitney tests were used.
  
  
  RESULTS
  After 19 months, results showed 96% success rate. Two out of fifty implants failed due to mobility. The mean depth of implants in sinus, mean height of residual crestal bone before surgery, and the mean rate of crestal bone loss were 3.8, 7.9, and 0.71 mm, respectively.
  
  
  CONCLUSIONS
  Osteotome sinus lift technique is a noninvasive surgical method for enhancing a desired length. Furthermore, implants insertion was successful after osteotome sinus lift technique in cases with insufficient bone height.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Dental Implants Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Bijan Movahedian
authors.initials: BM
authors.lastname: Attar
authors.affiliation: Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Samaneh
authors.initials: S
authors.lastname: Alaei
authors.affiliation: Cosmetic and Dental Restorative Specialist, Private Practice, Isfahan, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Badrian
authors.affiliation: Dental Students Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Amin
authors.initials: A
authors.lastname: Davoudi
keywords: Dental implant; maxillary sinus; sinus lift