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Short Dental Implants vs. Long Dental Implants

December 2, 2019


The purpose of this study is to evaluate the survival rate of 5 mm short implants compared to longer implants (10 mm) placed in sinus-grafted sites. The primary aim is to compare bone loss between the two groups, whilst the secondary aim is to compare surgical time and the satisfaction and post-operative pain of the patient. 


Study Information

This study will recruit 34 patients, all of whom require an implant to replace an upper missing tooth in the premolar or 1st molar area, with a bone crest height from 5 to 8 mm. Patients will be randomized to either the test (5-mm implant) or control group (10-mm implant). 17 patients will receive a sinus lift procedure, bone graft, and 10 mm implant while the other 17 patients will receive a 5 mm short implant. The study began on October 14th 2019 and is estimated to be completed by December 21st 2022. 


Inclusion Criteria


  • Age 20-70 years at enrollment
  • Systemically healthy patients
  • Full-mouth plaque score and full-mouth bleeding score ≤ 30% (measured at four sites per tooth)
  • In need of one premolar or 1st molar dental implant in the maxillary area
  • Neighboring teeth to the planned implant must have natural root(s) or implant supported restoration.
  • Presence of natural tooth/teeth, partial prosthesis and/or implants in the opposite jaw in contact with the planned crown/s deemed by the investigator as likely to present an initially stable implant situation
  • Residual bone height under the maxillary sinus between 5 to 7 mm and a width of at least 7 mm, as measured on cone beam computer tomography (CBCT) scans.


Exclusion Criteria


  • Unlikely to be able to comply with study procedures
  • Uncontrolled pathologic processes in the oral cavity
  • History of head and neck chemotherapy within 5 years prior to surgery
  • Systemic or local disease or condition that could compromise post-operative healing and/or osseointegration
  • Uncontrolled diabetes mellitus HbA1c >8
  • Taking corticosteroids, IV bisphosphonates, or any other medication that could influence post-operative healing and/or osseointegration
  • Smokes more than 10 cigarettes/day
  • Bruxer
  • Present alcohol and/or drug abuser
  • Pregnant, unsure pregnancy status, or lactating females (self-reported)



This study is taking place at the University of Michigan School of Dentistry, Ann Arbor, Michigan, United States, 48109. For further information please contact Tae-Ju Oh, DDS, MS on 734-647-3320 or at You may also contact Alice Ou, RDH, MS on 734-763-3346 or at



This study is sponsored by the University of Michigan. Tae-Ju Oh, DDS, MS is the Principal Investigator.

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