title: Resonance frequency analysis of stability on ITI implants with osteotome sinus floor elevation technique without grafting: a 5-month prospective study.
abstract: OBJECTIVE
  The aim of the present study was to (1) monitor the stability changes of ITI implants placed in atrophic posterior maxillary ridges with osteotome sinus floor elevation (OSFE) without grafting during the first 5 months of healing utilizing resonance frequency analysis (RFA) and (2) determine the factors that affect the implant stability quotient (ISQ) at placement and healings.
  
  
  METHODS
  Forty-two ITI implants were placed in the posterior maxilla in 32 patients with OSFE without bone grafting. The residual vertical bone height ranged from 4 to 8 mm (average 6.36 mm). Bone type was classified into one to four groups according to the Lekholm and Zarb index. ISQ was tested on the day of surgery and consecutively at 2, 4, 6, 8, 12, 16, and 20 weeks by RFA.
  
  
  RESULTS
  The 40 osseointegrated implants represented a survival rate of 95.2%. All the 40 implants achieved good primary stability and reached a comparably high stability at 16 weeks postoperation with a dip between 2 and 6 weeks in the stability curve. There was no significant difference of ISQ between type3 and type4 bone at implant placement and follow-up. The mean ISQ and its changing pattern did not demonstrate a statistically significant difference according to the pretreatment vertical bone height and implant length.
  
  
  CONCLUSIONS
  The findings of this study indicated that uneventful osseointegration may be predictable applying OSFE alone with no grafting in atrophic posterior maxilla. Residual bone height (RBH), implant length, and bone type did not seem to affect the implant stability in this clinical situation.
authors: Department of Oral and Maxillo-facial Implantology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University, Shanghai, China. lhc9@hotmail.com
authors: Hong-Chang
authors: HC
authors: Lai
authors: Zhi-Yong
authors: ZY
authors: Zhang
authors: Feng
authors: F
authors: Wang
authors: Long-Fei
authors: LF
authors: Zhuang
authors: Xin
authors: X
authors: Liu
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000534:rehabilitation; D000704:Analysis of Variance; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000601:surgery*; D008875:Middle Aged; D013516:Oral Surgical Procedures, Preprosthetic / Q000379:methods*; D010027:Osteotomy; D011446:Prospective Studies; D011859:Radiography; D018709:Statistics, Nonparametric; D014732:Vibration
chemical_list: D015921:Dental Implants