Application of Collagen Matrix in Peri-Implant Dehiscence Defect: A Case Series
During implant placement, dehiscence defects can result in complications such as mucosal recession and peri-implantitis. Whereas guided bone regeneration (GBR) is a common approach to managing these defects, it is often complex and time-intensive. This case series evaluates an alternative method using a collagen matrix (Collagen Graft2) applied to peri-implant dehiscence defects without GBR. Through three case series, this approach effectively preserves buccal contour, enhances gingival thickness, and supports bone regeneration, leading to favorable peri-implant conditions. These findings suggest that collagen matrix application is a viable and less invasive option for treating peri-implant dehiscence defects; however, further studies are required to validate these results.
Case 1. (a) Radiography shows the missing site of tooth #44 with sufficient bone height. (b) A buccal defect is observed at the missing site in the clinical photograph. (c) After implant placement, the implant fixture is partially exposed because of the buccal defect. (d) After trimming Collagen Graft2 (CG2) into proper sizes, CG2 is plugged into the healing abutment (HA). (e) HA with CG2 is connected to the implant fixture. (f) 2 weeks after surgery, the soft tissue is healed well, and the buccal contour is reconstructed from concave to convex. (g) The buccal contour is maintained well until 2 years of recall checks after prosthesis installation (asterisk). (h) No specific complication is observed on radiography.
Case 2. (a) Radiography showed the missing sites of teeth #14 and #15. (b) Well-healed ridge 4 months after tooth extraction. (c, d) A buccal bone defect is observed, and the implant fixture is partially exposed. (e) Collagen Graft2 is applied to the buccal defect site. (f) Implants are placed well. (g) When the flap is elevated for the connection of the healing abutment, vertically and horizontally well-regenerated bone was observed. (h, i, j) Implant prosthesis is delivered and maintained well (asterisk).
Case 3. (a) Gingival inflammation and implant fixture-like dark color are observed (arrow). (b) When the flap is elevated, peri-implant bone defect with fixture exposure is observed. (c) Collagen Graft2 is applied to the defect site after the fixture surface decontamination. (d) 2 weeks after surgery, gingival healing is good. (e, f) Peri-implant bone and soft tissue conditions seem favorable until 1 year of follow-up after prosthesis installation (asterisk).
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