Clinical and Radiographic Evaluation of Marginal Bone Changes Around Platform-switching Implants Placed in Crestal or Subcrestal Positions: a Randomized Controlled Clinical Trial
Sponsor study identifier
interventional
20
1 country
1
Study Start
April 17, 2019
Actual (reported)Primary Completion
May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
The objective of this randomized controlled trial is to evaluate changes in marginal bone levels and soft tissue dimensions around implants placed with the IAI at different positions in relation to the alveolar crest
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
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Dates and qualifiers reported by the registry. Estimated dates do not confirm that a milestone has occurred.
January 14, 2019
Actual (reported)January 16, 2019
Actual (reported)April 17, 2019
Actual (reported)May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Marginal bone loss(MBL)
Baseline will be recorded at the time of implantation. Margin bone loss(MBL) will be recorded at 0 day, 4 months, 1 year and 3 years after implant placement.
Change from baseline up to 5 years after implantation
Cumulative survival rate (CSR)
Up to 5 years after final restoration
Pocket probing depth (PPD)
Up to 5 years after final restoration
Plaque index (PI)
Up to 5 years after final restoration
Bleeding on probing (BOP)
Up to 5 years after final restoration
Implants were placed with the implant-abutment interface(IAI) at the level of the the alveolar ridge
Implants were placed with the implant-abutment interface(IAI) 1 mm below the level of the alveolar ridge
Subjects will be included with the absence of 2-4 teeth in the posterior region of the maxilla or mandibular. Twenty patients will be recruited. Two implant placement depths, equicrestal and subcrestal, were randomly assigned to two sites of each patient with a predefined randomization tables (one crestal implant and one subcrestal implant).
Subjects will be included with the absence of 2-4 teeth in the posterior region of the maxilla or mandibular. Twenty patients will be recruited. Two implant placement depths, equicrestal and subcrestal, were randomly assigned to two sites of each patient with a predefined randomization tables (one crestal implant and one subcrestal implant).
Guanghua School of Stomatology,Hospital of Stomatology,Sun Yat-Sen University
Guangzhou, Guangdong, 510000, China
Huang B, Meng H, Zhu W, Witek L, Tovar N, Coelho PG. Influence of placement depth on bone remodeling around tapered internal connection implants: a histologic study in dogs. Clin Oral Implants Res. 2015 Aug;26(8):942-949. doi: 10.1111/clr.12384. Epub 2014 Apr 10.
Huang B, Meng H, Piao M, Xu L, Zhang L, Zhu W. Influence of placement depth on bone remodeling around tapered internal connection implant: a clinical and radiographic study in dogs. J Periodontol. 2012 Sep;83(9):1164-71. doi: 10.1902/jop.2012.110617. Epub 2012 Jan 5.
Baoxin Huang, PhD
Sun Yat-sen Unniversity
First Submitted
January 14, 2019
First Posted
January 16, 2019
Study Start
April 17, 2019
Actual (reported)Primary Completion
May 2026
Estimated (date passed)Peri-Implant Healing Around Two Different Machined-Collar Designs After 25 Years of Function
Registry-reported names are shown in full. Names without a link have not yet been matched to a Syfrah profile.
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Koutouzis T, Neiva R, Nonhoff J, Lundgren T. Placement of implants with platform-switched Morse taper connections with the implant-abutment interface at different levels in relation to the alveolar crest: a short-term (1-year) randomized prospective controlled clinical trial. Int J Oral Maxillofac Implants. 2013 Nov-Dec;28(6):1553-63. doi: 10.11607/jomi.3184.
Valles C, Rodriguez-Ciurana X, Clementini M, Baglivo M, Paniagua B, Nart J. Influence of subcrestal implant placement compared with equicrestal position on the peri-implant hard and soft tissues around platform-switched implants: a systematic review and meta-analysis. Clin Oral Investig. 2018 Mar;22(2):555-570. doi: 10.1007/s00784-017-2301-1. Epub 2018 Jan 8.
This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
May 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Last Updated
April 20, 2022
Record last verified: 2022-04
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