Hemostatic Gelatin Sponge Versus Collagen Matrix in Alveolar Ridge Preservation

  • End date
    Feb 15, 2023
  • participants needed
  • sponsor
    University Ghent
Updated on 15 July 2022


Patients in need of extraction of two teeth followed by implant replacement, with > 50% buccal bone present following tooth extraction and with 1 or 2 neighbouring teeth present, were invited to participate in an intra-subject RCT comparing hemostatic gelatin sponge to collagen matrix as socket seal in alveolar ridge preservation.

The sample size calculation indicated 16 patients to be included per group. To compensate for dropouts, this number was increased to 20 patients per group. Coincidence (coin flip) determined which site is treated with the gelatine sponge and which with the collagen matrix.

Teeth were extracted without flap elevation. When deemed necessary by the clinician, papillary incisions were made for minimal reflection, which enabled to place elevators without damaging soft tissues. Buccal soft tissues were never raised. Following wound debridement and rinsing, the alveolar socket was filled with collagen-enriched deproteinized bovine bone mineral (C-DBBM, Bio-Oss Collagen® 100 mg or 250 mg, Geistlich Pharma AG, Wolhusen, Switzerland) up to the level of the oral bone crest. Subsequently, a collagen matrix (Mucograft Seal®, Geistlich Pharma AG, Wolhusen, Switzerland) or gelatin spons (Spongostan Dental® 1x1x1 cm, Ethicon, Johnson & Johnson, New Brunswick, VS) was sutured on top with 4 to 6 single sutures (Seralon 6/0, Serag Weissner, Naila, Germany) to protect the underlying C-DBBM.

Changes in soft tissue height at the buccal and oral aspect is the primary outcome. A small-field low-dose CBCT image was taken at T0 (immediately postop) and T3 (4 months). Those images were superimposed in specialized software (OnDemand3D, Cybermed Inc., Seoul, South-Korea). Changes in soft tissue height were calculated by subtracting soft tissue height at T3 from soft tissue height at T0.

Secondary outcomes included wound healing and closure in the first three weeks, changes in hard and soft tissues and mucosal scarring after 4 months.

Condition Changes in Soft Tissue Height
Treatment test group: collagen matrix (Mucograft Seal®, Geistlich Pharma AG, Wolhusen, Switzerland)
Clinical Study IdentifierNCT05423535
SponsorUniversity Ghent
Last Modified on15 July 2022


Yes No Not Sure

Inclusion Criteria

good oral hygiene (plaque score < 25%)
or 2 neighbouring teeth present
in need for extraction of two teeth, followed by implant placement
>50% bone present
signed informed consent

Exclusion Criteria

systematic diseases
history of periodontitis
untreated caries lesions
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