OBJECTIVES: To test whether or not tissue integration, biodegradation, and new blood vessel formation in two collagen-based matrices depend on the level of chemical cross-linking. MATERIAL AND METHODS: Two collagen matrices with high (CM1) and low (CM2) levels of chemical cross-linking were randomly implanted in two pouches in 14 athymic nude mice. Three and 6 weeks later, the animals were euthanized. Histologic and histomorphometric measurements were performed on paraffin-embedded sections. RESULTS: Both collagen matrices integrated well into the surrounding soft tissues. The level of cross-linking and duration of implantation had an effect on the formation of new blood vessels. More blood vessels (n = in absolute numbers) were found in outer compartments compared to the central compartments of the matrices, reaching 5.6 (CM2) vs. 4.3 (CM1) at 3 weeks, and 5.3 (CM2) vs. 7.3 (CM1) at 6 weeks. Similarly, connective tissue formation increased for both matrices between 3 and 6 weeks, whereas the amount of remaining collagen network gradually decreased over time being more pronounced for CM1 (-50%) compared to CM2 (-15%). CONCLUSIONS: The degree of cross-linking was negatively correlated for all outcome measures resulting in improved tissue integration, superior matrix stability and enhanced angiogenic patterns for the less cross-linked collagen matrix (CM2) in this experimental study in mice.
OBJECTIVES: To test whether or not tissue integration, biodegradation, and new blood vessel formation in two collagen-based matrices depend on the level of chemical cross-linking. MATERIAL AND METHODS: Two collagen matrices with high (CM1) and low (CM2) levels of chemical cross-linking were randomly implanted in two pouches in 14 athymic nude mice. Three and 6 weeks later, the animals were euthanized. Histologic and histomorphometric measurements were performed on paraffin-embedded sections. RESULTS: Both collagen matrices integrated well into the surrounding soft tissues. The level of cross-linking and duration of implantation had an effect on the formation of new blood vessels. More blood vessels (n = in absolute numbers) were found in outer compartments compared to the central compartments of the matrices, reaching 5.6 (CM2) vs. 4.3 (CM1) at 3 weeks, and 5.3 (CM2) vs. 7.3 (CM1) at 6 weeks. Similarly, connective tissue formation increased for both matrices between 3 and 6 weeks, whereas the amount of remaining collagen network gradually decreased over time being more pronounced for CM1 (-50%) compared to CM2 (-15%). CONCLUSIONS: The degree of cross-linking was negatively correlated for all outcome measures resulting in improved tissue integration, superior matrix stability and enhanced angiogenic patterns for the less cross-linked collagen matrix (CM2) in this experimental study in mice.
Authors: Stefan P Bienz; Cedryck Vaquette; Alexis Ioannidis; Christoph H F Hämmerle; Ronald E Jung; Sašo Ivanovski; Daniel S Thoma Journal: Clin Oral Investig Date: 2022-10-18 Impact factor: 3.606
Authors: Maurizio S Tonetti; Pierpaolo Cortellini; Gaia Pellegrini; Michele Nieri; Daniele Bonaccini; Mario Allegri; Philippe Bouchard; Francesco Cairo; Gianpaolo Conforti; Ioannis Fourmousis; Filippo Graziani; Adrian Guerrero; Jan Halben; Jacques Malet; Giulio Rasperini; Heinz Topoll; Hannes Wachtel; Beat Wallkamm; Ion Zabalegui; Otto Zuhr Journal: J Clin Periodontol Date: 2017-11-21 Impact factor: 8.728