Regenerative Outcomes for Peri-implant Bony Defects Using Amnion-chorion Barrier vs. Collagen Membrane

Not Applicable

Not yet recruiting

• Conditions: Peri-Implantitis

• Registration Number: NCT07032259
• Lead Sponsor: Loma Linda University

Brief Summary

The purpose of this study is to compare the clinical and radiographic outcomes of two different barrier membranes-amnion-chorion membranes (ACM) and conventional collagen membranes-used in guided bone regeneration (GBR) procedures for the treatment of peri-implantitis. Both membranes are commonly used in clinical practice; however, this study aims to determine whether ACM offers greater benefits in terms of peri-implant probing depth reduction, radiographic bone fill, and patient-reported post-operative healing outcomes. The findings may help inform surgical decision-making and support the use of ACM as a more effective regenerative material for managing peri-implant bony defects.

Detailed Description

Peri-implantitis is a common complication characterized by inflammation and progressive bone loss around dental implants. Guided bone regeneration (GBR) is a frequently employed surgical approach to manage peri-implant defects. Barrier membranes play a critical role in GBR by excluding soft tissue and supporting bone regeneration.

This randomized controlled clinical trial is designed to compare the outcomes of two commonly used barrier membranes: amnion-chorion membranes (ACM) and conventional collagen membranes. Although both are used in practice, ACM may offer additional biological benefits due to the presence of growth factors, anti-inflammatory properties, and native extracellular matrix components.

The study will enroll 56 participants across four clinical sites, with subjects randomly assigned to receive either ACM or a collagen membrane during peri-implant GBR surgery. Clinical parameters, including probing depths and peri-implant soft tissue health, will be recorded at baseline and follow-up visits. Patient-reported outcome measures (PROMs) will be collected using standardized questionnaires to evaluate post-operative healing, discomfort, and satisfaction. Standardized periapical radiographs will be taken at 3, 6, 12, 18, and 24 months to assess radiographic bone fill.

The primary objective is to determine whether the use of ACM results in improved clinical and radiographic outcomes compared to collagen membranes. Secondary objectives include evaluating patient-reported healing and long-term implant stability. Results from this study may inform clinical decision-making and potentially support the wider use of ACM in regenerative peri-implant therapy.

Study Timeline

• Study First Submitted: 2025-06-19
• Study First Submitted QC: 2025-06-19
• Study First Posted: 2025-06-22
• Status Verified: 2025-07
• Last Update Submitted: 2025-07-14
• Last Update Posted: 2025-07-17
• Study Start: 2025-09-01
• Primary Completion: 2027-07-01
• Study Completion: 2027-07-01

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 56

Inclusion Criteria

• Systemically healthy adults (≥18 years) with a diagnosed peri-implantitis lesion requiring surgical intervention of any ethnicity
• Comprehension of treatment plan and research project.
• Presence of a single implant in function for at least one year.
• Radiographic evidence of peri-implant bone loss not exceeding one-third of the implant length.
• 2-3 wall defects amenable to guided bone regeneration (GBR).
• Screw-retained, posterior, self-cleansing implant prosthesis.
• Commitment to maintaining oral hygiene and attending follow-up visits.

Exclusion Criteria

• Patients who have had a history of periodontitis, diabetes, smoking habit, or have been prescribed medications that may interfere with bone healing and metabolism
• Patients with allergies to any treatment devices
• Patients who have a lack of keratinized mucosa (<2 mm), or positioning for implants or restorative designs that compromise oral hygiene
• Peri-implant bone defects not attributable to peri-implantitis (e.g. surgical iatrogenic, trauma)
• Anterior implant restorations (#'s 6-11, #'s 22-27) or cement-retained restorations

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Peri-Implant Probing Depths	Baseline, 3, 6, 12, 18, and 24 months post-operatively	Mean reduction in peri-implant probing depth (in millimeters) measured using a standardized periodontal probe at six time points to assess clinical improvement following guided bone regeneration with either an amnion-chorion or collagen membrane.

Secondary Outcome Measures

Name	Time	Method
Radiographic Bone Fill	Over 2 years	Assessment of vertical bone fill (in millimeters) around the treated implant sites using standardized periapical radiographs taken at baseline and follow-up visits. Images will be analyzed using calibrated software.
PROMS	Baseline, 3, 6, 12, 18, and 24 months post-operatively	Patient-reported outcomes will be assessed using a standardized questionnaire evaluating pain, comfort, satisfaction, healing, and communication.; All items are rated on a 4-point Likert-type scale: 1 = Poor, 2 = Fair, 3 = Good, 4 = Excellent. Higher scores indicate better outcomes. Two yes/no item captures presence of post-op symptoms (e.g., swelling, bleeding, comfort).