title: Direct vs. indirect sinus lift procedure: A comparison.
abstract: BACKGROUND
  There are different techniques for the sinus augmentation; the factors that contribute to the survival rate of sinus augmentation and dental implant placement are still the subject of discussion. So we compare the two different ways of sinus floor elevation: a) Lateral antrostomy as a one or two step procedure as direct method. b) Osteotome technique with a crestal approach as indirect method.
  
  
  METHODS
  A total of twenty partially edentulous patients in maxillary posterior region who opted for implant retained prosthesis but had a low sinus and deficient alveolar ridge within the age group of 20-55 years were taken up, 25 implants were placed in combination with bone grafting material for sinus augmentation. The final bone height was measured from Orthopantomogram. Post-operative Clinical Evaluation was based on pain, gingival inflammation status, stability, swelling and bone height. Statistical analysis was done by using Statistical Package for Social Sciences (version 15.0) (SPSS Inc., Chicago, IL, USA).
  
  
  RESULTS
  The gain in bone height was significantly greater in direct procedure through lateral antrostomy (mean 8.5 mm) than in indirect method through crestal approach by osteotome technique (mean 4.4 mm).
  
  
  CONCLUSIONS
  Osteotome technique can be recommended when more than 6 mm of residual bone height is present and an increase of 3-4 mm is expected. In case of more advanced resorption direct method through lateral antrostomy has to be performed. Both sinus elevation techniques did not seem to affect the implant success rate.
authors.affiliation: Department of Oral and Maxillofacial Surgery, CSM Medical University, Lucknow, India.
authors.forename: U S
authors.initials: US
authors.lastname: Pal
authors.forename: Nanda Kishor
authors.initials: NK
authors.lastname: Sharma
authors.forename: R K
authors.initials: RK
authors.lastname: Singh
authors.forename: Shadab
authors.initials: S
authors.lastname: Mahammad
authors.forename: Divya
authors.initials: D
authors.lastname: Mehrotra
authors.forename: Nimisha
authors.initials: N
authors.lastname: Singh
authors.forename: Devendra
authors.initials: D
authors.lastname: Mandhyan