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This study was designed to assess peri-implant soft tissue health, volume and marginal stability at implants sites which presented small buccal bone dehiscences (<3mm evaluated in a vertical direction) at the time of insertion. Patients will be then randomly allocated to receive grafting with connective tissue graft or volume stable collagen matrix and evaluated at 3 months after surgery and at 12 months of follow up after crown placement.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Subepithelial Connective Tissue Graft (SCTG) | Active Comparator | Soft tissue augmentation at peri-implant small buccal dehiscence with subepithelial connective tissue graft harvested from the patient's palate |
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| Volume Stable Collagen Matrix (VCMX) | Experimental | Soft tissue augmentation at peri-implant small buccal dehiscence with xenogenic volume stable collagen matrix |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Soft tissue augmentation with subepithelial connective tissue graft (SCTG) | Procedure | After the assessment of the vestibular bone dehiscence at implant site from the most apical extension of the trans-mucosal implant collar (≤3 mm evaluated in a vertical direction), SCTG will be harvested from the palate and sutured to the flap. Simple interdental sutures will be performed in order to stabilize the flap in close contact with the healing screw. |
| Measure | Description | Time Frame |
|---|---|---|
| Volumetric buccal soft tissue changes (-5 to +5 mm with positive values representing an increase in volume) | Mean linear change in mm at the buccal aspect 1mm below the soft tissue margin | 12 months |
| Change in Buccal Probing Pocket Depth (PD) at implant site (0-15 mm with higher values representing worse outcomes) | The distance between the buccal soft tissue margin and the base of the pocket | 12 months |
| Mucosal recession at the buccal aspect of the implant site (0-15 mm with higher values indicating worse outcomes) | The distance between the crown margin and the mucosal margin | 12 months |
| Pain (VAS scale)(0-10 with higher values indicating worse outcomes) | Subjective pain experienced by the patient expressed in a VAS scale | 12 months |
| Bleeding on probing (0 no bleeding, 1 presence of bleeding) | Bleeding after probing within 15 seconds | 12 months |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Mario Aimetti | Contact | 00390116331546 | mario.aimetti@unito.it |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Turin | Recruiting | Turin | Italy |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 40105088 | Derived | Ferrarotti F, Baima G, Mohammadi G, Carboncini C, Romano F, Aimetti M. Peri-Implant Soft Tissue Increase at Small Buccal Bone Dehiscences With Either Volume-Stable Collagen Matrix or Connective Tissue Graft: A Randomized Controlled Trial. Clin Oral Implants Res. 2025 Jul;36(7):846-858. doi: 10.1111/clr.14430. Epub 2025 Mar 19. |
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| Soft tissue augmentation with xenogenic volume stable collagen matrix (VCXM) | Procedure | After the assessment of the vestibular bone dehiscence at implant site from the most apical extension of the trans-mucosal implant collar (≤3 mm evaluated in a vertical direction), VCMX will be sutured to the flap and simple interdental sutures will be performed in order to stabilize the flap in close contact with the healing screw. |
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