The aim of this prospective study was to evaluate the efficacy of a cross-linked xenogeneic volume-stable collagen matrix (CCM) in treating gingival recessions (GRs) at teeth presenting with cervical ...restorations or noncarious cervical lesions (NCCLs). Fifteen patients with esthetic concerns for multiple sites with GRs and cervical restorations were consecutively enrolled. The sites were treated with a coronally advanced flap (CAF) design in combination with a CCM. When present, the previous restoration was removed, and the cementoenamel junction was reconstructed with a composite material. The CCM was stabilized on the root surface(s) previously occupied by the restoration. The CAF was sutured to completely cover the graft. Clinical measurements and intraoral digital and ultrasonographic scans were collected at baseline and at 3 and 6 months postsurgery. Limited postoperative discomfort was reported by patients during the healing. The mean root coverage at 6 months was 74.81%. Average increases in gingival thickness of 0.43 mm and 0.52 mm were observed when measured with ultrasonography 1.5 mm and 3 mm apical to the gingival margin, respectively (P < .05). Relatively high patient-reported satisfaction and esthetics were associated with the treatment outcomes. The treatment resulted in a significant reduction in dental hypersensitivity (mean: 33 VAS points). The present study demonstrated that CAF + CCM is an effective approach for treating GRs at sites with cervical restorations or NCCLs. Int J Periodontics Restorative Dent 2023;43:147-154. doi: 10.11607/prd.6448.
Aim
To compare the soft tissue volume gain (VG) around single tooth implants with subepithelial connective tissue graft (SCTG) from either the lateral palate (LP) or from the tuberosity area (TA).
...Methods
Thirty‐two patients with 36 implants with buccal volume deficiencies were randomly assigned to receive SCTG from LP (control group/CG) or TA (test group/TG). Clinical parameters were recorded. VG was evaluated by stereolithography (STL) image superimposition of two intraoral scans (baseline/BL and 3 months after surgery/FU‐3). Descriptive analysis was performed for both groups, and for comparisons, Mann–Whitney U test was used.
Results
In terms of VG values, no statistically significant differences were observed except for values at 6 and 7 mm apically to the healing abutment which favoured the TG. Mean values were 0.69 ± 0.23 mm for CG while TG obtained 0.79 ± 0.10 mm (p = .64). Regarding Keratinized tissue (KT) width statistical significant differences were found favouring TG, which obtained a gain of 0.83 ± 0.61 mm compared with 0.22 ± 0.48 mm for CG (p = .009). Pink esthetic scores resulted in mean values of 10.07 ± 2.19 for the CG, while TG obtained 9.15 ± 2.34.
Conclusions
Both procedures were effective in increasing soft tissue volume with no statistically significant differences. A longer follow‐up is needed to confirm or refute these results.
Abstract
The gingival epithelium, a stratified squamous tissue that acts as an interface between the external environment and the underlying connective tissue, plays an active role in maintaining ...periodontal health. The aim of the present study was to investigate the ability of green tea catechins to enhance gingival epithelial barrier function and protect against the disruption of epithelial integrity induced by Porphyromonas gingivalis. Both the green tea extract and epigallocatechin-3-gallate (EGCG) dose- and time-dependently increased the transepithelial electrical resistance (TER) of a gingival keratinocyte model and decreased the permeability of the cell monolayer to fluorescein isothyocyanate-conjugated 4.4-kDa dextran. This was associated with the increased expression of zonula occludens-1 (ZO-1) and occludin, two tight junction proteins. Treating the gingival keratinocyte monolayer with P. gingivalis caused a reduction in TER and affected the distribution of ZO-1 and occludin, allowing P. gingivalis to translocate through the cell monolayer. These deleterious effects mediated by P. gingivalis were abolished by the green tea extract and EGCG. This protection may be in part related to the ability of tea catechins to inhibit the protease activities of P. gingivalis. Given the above properties, green tea catechins may represent promising preventive and therapeutic molecules against periodontal disease.
Green tea catechins, including epigallocatechin-3-gallate, enhance the integrity of the gingival keratinocyte barrier and exert a protective effect against the deleterious effects (barrier integrity breakdown, invasion) caused by P. gingivalis.
Background and Objective
Over the last 10 years, bioactive plant food compounds have received considerable attention in regard to their beneficial effects against periodontal disease. In this study, ...we investigated the effects of black tea theaflavins (TFs) on the virulence properties of Porphyromonas gingivalis and gingival keratinocyte tight junction integrity. In addition, the effects of black tea TFs on the nuclear factor‐κB (NF‐κB) signaling pathway and proinflammatory cytokine/matrix metalloproteinase (MMP) secretion by monocytes/macrophages were assessed.
Material and Methods
Virulence factor gene expression in P. gingivalis was investigated by quantitative real‐time PCR. A fluorescence assay was used to determine P. gingivalis adherence to, and invasion of, a gingival keratinocyte monolayer. Tight junction integrity of gingival keratinocytes was assessed by determination of transepithelial electrical resistance. Proinflammatory cytokine and MMP secretion by P. gingivalis‐stimulated macrophages was quantified by ELISA. The U937‐3xκB‐LUC monocyte cell line transfected with a luciferase reporter gene was used to monitor NF‐κB activation. Gelatin degradation was monitored using a fluorogenic assay.
Results
Black tea TFs dose‐dependently inhibited the expression of genes encoding the major virulence factors of P. gingivalis and attenuated its adherence to gingival keratinocytes. A treatment of gingival keratinocytes with black tea TFs significantly enhanced tight junction integrity and prevented P. gingivalis‐mediated tight junction damage as well as bacterial invasion. Black tea TFs reduced the secretion of interleukin (IL)‐1β, tumor necrosis factor‐α, IL‐6, chemokine (C‐X‐C) ligand 8, MMP‐3, MMP‐8 and MMP‐9 by P. gingivalis‐stimulated macrophages and attenuated the P. gingivalis‐mediated activation of the NF‐κB signaling pathway. Lastly, black tea TFs inhibited gelatin degradation by MMP‐9.
Conclusion
This study provides clear evidence that black tea TFs represent promising multifunctional therapeutic agents for prevention and treatment of periodontal disease.
Actinomycosis is a rare disease. Its diagnosis is challenging clinically as it mimics many other infectious diseases and neoplasms. In this scenario, a simple timely biopsy can come to the ...clinician’s rescue. Actinomycosis can be reliably diagnosed on histopathological examination accompanied by special stains without losing much time. Culturing this organism is a tedious job in view of its fastidious nature and requires a long waiting time. Polymerase chain reaction (PCR) can be useful and is less time-consuming, but histopathology is more cost-effective in our country like India. This case report emphasizes the fact that a rare possibility of actinomycosis should also be kept in mind even in immunocompetent individuals in rare sites like gingiva even if there are no discharging sinuses noted clinically. Actinomycosis requires long-duration antibiotic treatment, so if diagnosis time is reduced, timely treatment of actinomycosis can be started and complications can be prevented.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Smoking is one of the major lifestyle-related risk factors for periodontal diseases. Modified risk tobacco products (MRTP) offer a promising alternative in the harm reduction strategy for adult ...smokers unable to quit. Using a systems toxicology approach, we investigated and compared the exposure effects of a reference cigarette (3R4F) and a heat-not-burn technology-based candidate MRTP, the Tobacco Heating System (THS) 2.2. Human gingival epithelial organotypic cultures were repeatedly exposed (3 days) for 28 min at two matching concentrations of cigarette smoke (CS) or THS2.2 aerosol. Results showed only minor histopathological alterations and minimal cytotoxicity upon THS2.2 aerosol exposure compared to CS (1% for THS2.2 aerosol vs. 30% for CS, at the high concentration). Among the 14 proinflammatory mediators analyzed, only 5 exhibited significant alterations with THS2.2 exposure compared with 11 upon CS exposure. Transcriptomic and metabolomic analysis indicated a general reduction of the impact in THS2.2 aerosol-exposed samples with respect to CS (∼79% lower biological impact for the high THS2.2 aerosol concentration compared to CS, and 13 metabolites significantly perturbed for THS2.2 vs. 181 for CS). This study indicates that exposure to THS2.2 aerosol had a lower impact on the pathophysiology of human gingival organotypic cultures than CS.
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•Systems toxicology approach to compare the effects of cigarette smoke and THS2.2 aerosol on gingival organotypic cultures.•Organotypic gingival cultures resemble the native gingival epithelium in the response to cigarette smoke.•Oxidative stress, xenobiotic metabolism and inflammation gene networks are perturbed by cigarette smoke.•THS2.2 aerosol has a reduced impact on gingival organotypic cultures compared to cigarette smoke.
The aim of this study is to investigate the mechanisms linking high glucose to gingival wound healing. Bilateral wounds were created in the palatal gingiva adjacent to maxillary molars of control ...rats and rats with streptozotocin-induced diabetes. After evaluating postsurgical wound closure by digital imaging, the maxillae including wounds were resected for histological examinations. mRNA expressions of angiogenesis, inflammation, and oxidative stress markers in the surgical sites were quantified by real-time polymerase chain reaction. Primary fibroblast culture from the gingiva of both rats was performed in high glucose and normal medium. In vitro wound healing and cell proliferation assays were performed. Oxidative stress marker mRNA expressions and reactive oxygen species production were measured. Insulin resistance was evaluated via PI3K/Akt and MAPK/Erk signaling following insulin stimulation using Western blotting. To clarify oxidative stress involvement in high glucose culture and cells of diabetic rats, cells underwent N-acetyl-L-cysteine treatment; subsequent Akt activity was measured. Wound healing in diabetic rats was significantly delayed compared with that in control rats. Nox1, Nox2, Nox4, p-47, and tumor necrosis factor-α mRNA levels were significantly higher at baseline in diabetic rats than in control rats. In vitro study showed that cell proliferation and migration significantly decreased in diabetic and high glucose culture groups compared with control groups. Nox1, Nox2, Nox4, and p47 expressions and reactive oxygen species production were significantly higher in diabetic and high glucose culture groups than in control groups. Akt phosphorylation decreased in the high glucose groups compared with the control groups. Erk1/2 phosphorylation increased in the high glucose groups, with or without insulin treatment, compared with the control groups. Impaired Akt phosphorylation partially normalized after antioxidant N-acetyl-L-cysteine treatment. Thus, delayed gingival wound healing in diabetic rats occurred because of impaired fibroblast proliferation and migration. Fibroblast dysfunction may occur owing to high glucose-induced insulin resistance via oxidative stress.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Peripheral Ameloblastic Fibroma: A Rare Case Report İlknur ENİNANÇ; Defne YALÇIN YELER; Ömer Fahrettin GÖZE ...
Current research in dental sciences (Online),
04/2023, Letnik:
33, Številka:
2
Journal Article
Peripheral nerve injuries (PNIs) are common and debilitating, usually resulting in considerable long-term disability and remaining an unmet clinical need. Even though the combination of mesenchymal ...stem cells (MSCs) and the state-of-the-art tissue engineering technologies has shown promising therapeutic potentials for PNI, there is still not a single licensed stem cell-based product for peripheral nerve repair/regeneration. Emerging evidence indicates that MSC-derived extracellular vesicles (EVs) are comparably effective as MSCs in the therapy of a variety of disease models or pathological conditions. This report shows that local delivery of gingiva-derived mesenchymal stem cell (GMSC)-derived EVs could obviously promote axonal regeneration and functional recovery of injured mice sciatic nerves. Importantly, the findings suggest that GMSC-derived EVs promoted the expression of Schwann cell dedifferentiation/repair phenotype-related genes
, particularly c-JUN, a key transcription factor that drives the activation of repair phenotype of Schwann cells during PNI and regeneration.
Background and Objectives
Diabetes mellitus (DM) is a risk factor for periodontal diseases and may exacerbate the progression of the pathogenesis of periodontitis. Advanced glycation end‐products ...(AGEs) cause DM complications relative to levels of glycemic control and larger amounts accumulate in the periodontal tissues of patients with periodontitis and DM. In the present study, we investigated the effects of AGEs on the expression of inflammation‐related factors in human gingival fibroblasts (HGFs) to elucidate the impact of AGEs on DM‐associated periodontitis.
Material and Methods
HGFs were cultured with or without AGEs. Cell viability was examined, and RNA and protein fractions were isolated from AGE‐treated cells. The expression of interleukin (IL)‐6, intercellular adhesion molecule‐1 (ICAM‐1), and the receptor for AGE (RAGE) was investigated using reverse transcription‐polymerase chain reaction, quantitative real‐time polymerase chain reaction and enzyme‐linked immunosorbent assay, and reactive oxygen species activity was measured using a kit with 2′,7′‐dichlorofluorescin diacetate. Human monocytic cells (THP‐1) labeled with a fluorescent reagent were co‐cultured with HGFs treated with AGEs and IL‐6 siRNA, and the adhesive activity of THP‐1 cells to HGFs was assessed. The expression of IL‐6 and ICAM‐1 was examined when HGFs were pretreated with recombinant human IL‐6, the siRNAs of RAGE and IL‐6, and inhibitors of MAPK and NF‐κB, and then cultured with and without AGEs. The phosphorylation of MAPK and NF‐κB was assessed using western blotting.
Results
AGEs increased the mRNA and protein expressions of RAGE, IL‐6, ICAM‐1 and reactive oxygen species activity in HGFs, and promoted the adhesion of THP‐1 cells to HGFs, but had no effect on cell viability until 72 hours. Recombinant human IL‐6 increased ICAM‐1 expression in HGFs, while the siRNAs of RAGE and IL‐6 inhibited AGE‐induced IL6 and ICAM1 mRNA expression, and IL‐6 siRNA depressed AGE‐induced THP‐1 cell adhesion. AGEs increased the phosphorylation of p38 and ERK MAPKs, p65 NF‐κB and IκBα, while inhibitors of p38, ERK MAPKs and NF‐κB significantly decreased AGE‐induced IL‐6 and ICAM‐1 expression.
Conclusion
AGEs increase IL‐6 and ICAM‐1 expression via the RAGE, MAPK and NF‐κB pathways in HGFs and may exacerbate the progression of the pathogenesis of periodontal diseases.
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