Fig. 1. Clinical photographs of the experimental sites. (A) Four circumferential defects with 8 mm diameter in rabbit calvarium. (B) Random assignment of defects, from top left in clockwise; membrane group, cyanoacrylate group, 3,4-dihydroxyphenylalanine (DOPA) group, and control group.
Fig. 2. Peel resistance test. Cyanoacrylate, when applied to collagen membrane, shows higher resistance to peeling load compared to 3,4-dihydroxyphenylalanine (DOPA).
Fig. 3. Cell cytotoxicity test. Cyanoacrylate (T1) shows the lowest cell viability whereas 3,4-dihydroxyphenylalanine (DOPA) (T2) shows the highest value. BC: blank control group, NC: negative control group, PC: positive control group, C: control group, T1: cyanoacrylate group, T2: DOPA group.
Fig. 4. Three-dimensionally reconstructed micro-computed tomography images of defects at 2 weeks. (A) Control group. (B) Membrane group. (C) Cyanoacrylate group. (D) 3,4-Dihydroxyphenylalanine (DOPA) group.
Fig. 5. Three-dimensionally reconstructed micro-computed tomography images of defects at 8 weeks. (A) Control group. (B) Membrane group. (C) Cyanoacrylate group. (D) 3,4-Dihydroxyphenylalanine (DOPA) group.
Fig. 6. Histologic view after 2 weeks of healing showing (A) control group, defect space is mostly empty; (B) membrane group, collagen membrane is intact with good adaptation; (C) cyanoacrylate group, space is well-maintained by bone graft materials with overlying intact collagen membrane; (D) 3,4-dihydroxyphenylalanine (DOPA) group, collagen membrane is overlaid on defect with supporting bone graft particles. Masson trichrome staining. Scale bars=1 mm.
Fig. 7. Histologic view after 8 weeks of healing showing (A) control group, almost full closure of defect by bony bridge is observed; (B) membrane group, only a small amount of bony islands is formed with partially resorbed collagen membrane; (C) cyanoacrylate group, newly formed bone from the margin of defect is present; (D) 3,4-dihydroxyphenylalanine (DOPA) group, more mature bone is present inside the bone graft scaffold compared to 2 weeks. Masson trichrome staining. Scale bars=1 mm.
Table 1. Values of MTV measured by micro-computed tomography grey value
Table 2. Histomorphometric analysis
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