Language：Japanese   Publisher：Clinical Oral Investigations  

Objectives: To evaluate periodontal wound healing following scaling and root planing (SRP) in conjunction with the application of sodium hypochlorite/amino acids and cross-linked hyaluronic acid (xHyA) gels in dogs. Materials and Methods: In four beagle dogs, 2-wall intrabony defects were created and metal strips were placed around the teeth. Clinical parameters were measured 4 weeks after plaque accumulation. The experimental root surfaces were subjected to SRP with either the subgingival application of a sodium hypochlorite/amino acid gel and a xHyA gel (test group) or SRP alone (control group) using a split-mouth design. Clinical parameters were re-evaluated at 6 weeks. The animals were sacrificed at 8 weeks for histological analysis. Results: The test group showed significant improvements in all clinical parameters compared to the control group. Histologically, the test group exhibited statistically significantly greater new bone formation [i.e., length of newly formed bone, new bone area] compared with the control group (p < 0.05). Furthermore, statistically significantly greater formation of new attachment [i.e., linear length of new cementum adjacently to newly formed bone with inserting collagen fibers] and new cementum was detected in the test group compared with the control group at 8 weeks (p < 0.05 and p < 0.01, respectively). Conclusion: The adjunctive subgingival application of sodium hypochlorite/amino acid and xHyA gels to SRP offers an innovative novel approach to enhance periodontal wound healing/regeneration. Clinical relevance: The present findings have for the first-time shown histologic evidence for periodontal regeneration in support of this novel treatment modality.

DOI： 10.1007/s00784-024-05674-7

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PubMed

Language：English  

DOI： 10.15283/ijsc23027

PubMed

Language：Japanese   Publisher：Journal of Clinical Periodontology  

Aim: To histologically evaluate the effects of cross-linked hyaluronic acid (xHyA) with or without a collagen matrix (CM) on periodontal wound healing/regeneration in class III furcation defects in dogs. Materials and Methods: Class III furcation defects were surgically created in the mandibular premolars in six beagle dogs. The defects were randomly treated as follows: open flap debridement (OFD) + CM (CM), OFD + xHyA (xHyA), OFD + xHyA + CM (xHyA/CM) and OFD alone (OFD). At 10 weeks, the animals were euthanized for histological evaluation. Results: The newly formed bone areas in the xHyA (4.04 ± 1.51 mm2) and xHyA/CM (4.32 ± 1.14 mm2) groups were larger than those in the OFD (3.25 ± 0.81 mm2) and CM (3.31 ± 2.26 mm2) groups. The xHyA (6.25 ± 1.45 mm) and xHyA/CM (6.40 ± 1.35 mm) groups yielded statistically significantly (p <.05) greater formation of new connective tissue attachment (i.e., new cementum, with inserting connective tissue fibres) compared with the OFD (1.47 ± 0.85 mm) group. No significant differences were observed in any of the histomorphometric parameters between the xHyA and xHyA/CM groups. Complete furcation closure was not observed in any of the four treatment modalities. Conclusions: Within their limits, the present results suggest that the use of xHyA with or without CM positively influences periodontal wound healing in surgically created, acute-type class III furcation defects.

DOI： 10.1111/jcpe.13694

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PubMed

Language：Japanese   Publisher：Journal of Clinical Periodontology  

Aim: To evaluate periodontal wound healing/regeneration of one-wall intra-bony defects treated with recombinant human fibroblast growth factor-2 (rhFGF-2) and beta-tricalcium phosphate (β-TCP), carbonate apatite (CO3Ap), or deproteinized bovine bone mineral (DBBM) in dogs. Materials and Methods: The stability of rhFGF-2 adsorbed onto the bone substitutes was evaluated by Enzyme-Linked Immunosorbent Assay (ELISA). One-wall intra-bony defects (5 × 5 × 5 mm) created in five adult male beagle dogs were treated with rhFGF-2 alone (rhFGF-2), rhFGF-2 with β-TCP (rhFGF-2/β-TCP), rhFGF-2 with CO3Ap (rhFGF-2/CO3Ap), or rhFGF-2 with DBBM (rhFGF-2/DBBM). Histological outcomes (e.g., linear length of new cementum adjacent to the newly formed bone with inserting collagen fibres [NA] as the primary outcome) were evaluated at 10 weeks post surgery. Results: Significantly higher amount of rhFGF-2 was adsorbed onto CO3Ap compared with β-TCP. Among the treatment groups, the rhFGF-2/DBBM group showed the highest amount of periodontal tissue regeneration. The rhFGF-2/DBBM group showed significantly greater formation of NA (3.22 ± 0.40 mm) compared with rhFGF-2 (1.17 ± 1.00 mm, p <.01) group. Additionally, new bone area in the rhFGF-2/DBBM group (9.78 ± 2.30 mm2) was significantly higher than that in the rhFGF-2 (5.08 ± 1.26 mm2, p <.01), rhFGF-2/β-TCP (5.91 ± 1.27 mm2, p <.05), and rhFGF-2/CO3Ap (6.51 ± 1.49 mm2, p <.05) groups. Slight ankylosis was found in the rhFGF-2/β-TCP (1/9 sites), rhFGF-2/CO3Ap (3/10 sites), and rhFGF-2/DBBM (1/9 sites) groups. Conclusions: Within their limitations, the present data indicate that DBBM seems to be a suitable carrier for rhFGF-2 and that rhFGF-2/DBBM treatment promotes favourable periodontal regeneration compared with rhFGF-2, rhFGF-2/β-TCP, and rhFGF-2/CO3Ap treatments in one-wall intra-bony defects.

DOI： 10.1111/jcpe.13619

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PubMed

Language：Japanese   Publisher：Archives of Oral Biology  

Objective: The aim of this in vitro study was to investigate the expression of SARS-CoV-2 entry and processing genes in human gingival fibroblasts (HGnF) following treatment with Porphyromonas gingivalis-derived lipopolysaccharide (PgLPS) or inflammatory cytokines/mediators. Design: We assessed the expression of SARS-CoV-2 entry and processing genes; angiotensin-converting enzyme 2 (ACE2), cellular serine proteases transmembrane serine protease 2 (TMPRSS2), Furin, and basigin (BSG) in HGnF by real-time PCR. To further asses the contribution of PgLPS and inflammatory cytokines/mediators to proliferation and SARS-CoV-2 entry and processing gene expression, HGnF were treated with PgLPS, IL1β, TNFα, and PGE2. Results: The expression for ACE2 in HGnF was significantly elevated after PgLPS or IL1β, TNFα, PGE2 treatment. The expression of TMPRSS2 was increased by PgLPS, IL1β, or PGE2 while BSG was elevated by PgLPS and IL1β. The expression of BSG and FURIN decreased after TNFα treatment. Conclusion: SARS-CoV-2 entry and processing genes are expressed in human gingival fibroblasts and their expressions are altered by PgLPS, IL1β, TNFα and PGE2 treatment.

DOI： 10.1016/j.archoralbio.2021.105201

Scopus

PubMed

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Poster presentation  

Venue：日本歯周病学会   Country：Japan  

Event date： 2022.8

Language：Japanese   Presentation type：Oral presentation (general)