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Soft Tissue Dehiscence Around Implants

December 2, 2019


This study is looking at how to treat the problem of soft tissue dehiscences at implant sites. It is assessing the influence of two different flap designs (envelope Coronally Advanced Flap (eCAF)) and Modified Tunnel Technique (MTT)) with the addition of a connective tissue graft (CTG).


Study Information

This clinical trial will involve 28 participants. Participants will be randomly divided into two groups and each will undergo mucogingival surgery involving different flap designs. This study began on July 10th 2018 and is predicted to be completed by April 1st 2021. 


Inclusion Criteria


  • Over 18 years old
  • Periodontally and systemically healthy
  • Full-mouth plaque score and full-mouth bleeding score ≤ 20% (measured at four sites per tooth)
  • Correct implant 3-dimensional position or buccal position ≤ 1 mm
  • Buccal soft tissue dehiscence ≤ 4 mm
  • Only osseointegrated implants
  • The patient must be able to perform good oral hygiene


Exclusion Criteria


  • Contraindications for periodontal surgery
  • Patients pregnant or attempting to get pregnant
  • Malpositioned implant
  • STD > 4 mm
  • Multiple adjacent implants with STD
  • Existing of peri-implantitis
  • Severe bone loss (≥4mm)
  • Moderate-severe interproximal bone loss (implant fixture level to the alveolar bone > 3 mm)
  • Moderate-severe papilla height loss (Nordland and Tarnow implant papillae index >1)
  • Previous mucogingival surgery around the implant within the past six months or implant placement at the surgical site less than six months prior
  • Smoking more than 10 cigarettes a day



This study is taking place at the University of Michigan School of Dentistry, Ann Arbor, Michigan, United States, 48109. For further information, contact Lorenzo Tavelli, DDS on +1 (734) 6044364 or at



This study is sponsored by the University of Michigan and the Delta Dental Foundation. Hom-Lay Wang, DDS MSD PhD is the Principal Investigator.

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