L-PRF
Autologous Leukocyte-platelet Rich Fibrin (L-PRF) Versus a Xenogeneic Bone Substitute Combined With a Collagen Matrix for Alveolar Ridge Preservation. A Randomized Controlled Clinical Trial
Sponsor study identifier
interventional
38
1 country
1
Study Start
November 1, 2022
Actual (reported)Primary Completion
October 2024
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
March 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
After tooth extraction, there is a subsequent bone loss as a part of the natural healing of the tissue. Up to 50% of bone loss occurs during the first three months after extraction, jeopardizing a possible implant treatment. Alveolar ridge preservation techniques reduce bone loss, allowing a future implant treatment. Different bone filling materials have been used with good clinical results. The second-generation platelet concentrates (L-PRF) have recently been shown to induce bone regeneration when filling the socket after extraction, with significant biological and economic advantages. The hypothesis of this study is to test whether or not the use of L-PRF in alveolar ridge preservation results in a non-inferior horizontal radiographic change compared with the combination of a xenogeneic bone substitute with a collagen matrix.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
March 2025
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.
May 3, 2022
Actual (reported)October 7, 2022
Actual (reported)November 1, 2022
Actual (reported)October 2024
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
March 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Bone socket horizontal and vertical changes evaluated using cbct ((cone beam computed tomography)
Cone-beam computed tomographic (CBCT) imaging will be used to assess the primary outcome (horizontal radiographic changes at -1 mm below the alveolar crest) in both groups between baseline 1 (immediately post socket preservation), visit 4 (4 months after socket preservation), and 12 months after implant rehabilitation. Linear measurements will be performed. The most apical point of the extraction socket will be defined, and two reference lines will be subsequently drawn. The vertical reference line will be drawn in the center of the extraction socket crossing the apical reference point. A horizontal reference line will be drawn perpendicular to the vertical line crossing the apical reference point. Based on these reference lines, the horizontal ridge width will then be measured at -1 mm below the alveolar crest (HW-1). The same procedure will be applied for assessing the horizontal ridge width changes will then be measured at -3 mm (HW-3) and 5- mm (HW-5) below the alveolar crest.
first cbct immediately after socket preservation surgery, second cbct 4 months after surgery, 12 months after the final restoration of the implant.
Mucosal height
4 months after implant insertion, at the final restoration delivery
Peri-implant Keratinized Mucosa
10 days, 6, and 12 months after final restoration
Bleeding on probing
10 days, 6, and 12 months after final restoration
Probing depth
10 days, 6, and 12 months after final restoration
Profilometric Changes
at baseline (socket preservation), 4 months (implant insertion), 10 days and 12 months after final restoration delivery
Using L-PRF membranes inside the socket, covering with L-PRF membranes, (test group).
Bio-Oss® Collagen at the bone level and application of a collagen matrix (Combi-Kit). Both materials will be used for socket preservation (control).
Partially edentulous patients in need of a single-tooth extraction in the premolar region\[ (maxilla or mandible), with two neighboring natural teeth, will be included in the study. The tooth will be luxated first with elevators and then carefully extracted with forceps without raising a flap. L-PRF group will use 2-5 PRF clots, depending on the size of the socket, which will be inserted and compressed with a large plunger until they reach the alveolar crest. The site will thereafter be covered with L-PRF membranes. Then, crossed horizontal mattress suture will be placed followed by single interrupted sutures for stabilization. No efforts will be undertaken to obtain primary wound closure. The grafted socket will be left to heal for 4 months. After 4 months of socket preservation, a dental implant will be inserted into the socket. After 4 months of implant healing, a cad cam final restoration will be delivered. The follow-up will be up to 12 months after the final restoration.
Centro de Salud, Universidad de los Andes
Santiago, Santiago Metropolitan, 8050000, Chile
Antonio Sanz, DDS
Professor
First Submitted
May 3, 2022
First Posted
October 7, 2022
Modified Ridge Splitting Technique Using Autogenous Bone Blocks (MRS)
Partially edentulous patients in need of a single-tooth extraction in the premolar region (maxilla or mandible), with two neighboring natural teeth, will be included in the study. The tooth will be luxated first with straight and angled elevators and then carefully extracted with forceps without raising a flap. In the control group, the socket will be grafted with xenogeneic bone substitute material (up to the palatal/lingual bone crest) and covered with a collagen matrix. Single interrupted sutures will be placed to stabilize the collagen matrix. Sutures will be removed at 7-10 days. The grafted socket will then be left to heal for a period of 4 months. The xenogenic material will be Bio-Oss Collagen® and collagen matrix Bio-Gide® . After 4 months of socket preservation, a dental implant will be placed. After 4 months of implant healing, a cad cam final restoration will be delivered. The follow-up will be up to 12 months after the final restoration.
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Study Start
November 1, 2022
Actual (reported)Primary Completion
October 2024
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
March 2025
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Last Updated
January 5, 2023
Record last verified: 2023-01
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