記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-023-28197-9

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI  

The coronavirus disease pandemic has afforded dental professionals an opportunity to reconsider infection control during treatment. We investigated the efficacy of combining extraoral high-volume evacuators (eHVEs) with preprocedural mouth rinsing in reducing aerosol contamination by ultrasonic scalers. A double-masked, two-group, crossover randomized clinical trial was conducted over eight weeks. A total of 10 healthy subjects were divided into two groups; they received 0.5% povidone-iodine (PI), essential oil (EO), or water as preprocedural rinse. Aerosols produced during ultrasonic scaling were collected from the chest area (PC), dentist's mask, dentist's chest area (DC), bracket table, and assistant's area. Bacterial contamination was assessed using colony counting and adenosine triphosphate assays. With the eHVE 10 cm away from the mouth, bacterial contamination by aerosols was negligible. With the eHVE 20 cm away, more dental aerosols containing bacteria were detected at the DC and PC. Mouth rinsing decreased viable bacterial count by 31-38% (PI) and 22-33% (EO), compared with no rinsing. The eHVE prevents bacterial contamination when close to the patient's mouth. Preprocedural mouth rinsing can reduce bacterial contamination where the eHVE is positioned away from the mouth, depending on the procedure. Combining an eHVE with preprocedural mouth rinsing can reduce bacterial contamination in dental offices.

DOI： 10.3390/ijerph19106048

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Laminin, a basement membrane heterotrimeric glycoprotein composed of α/β/γ subunits, has important tissue-specific functions in the control of cellular behavior. Our recent study showed the colocalization of CD163+ M2-like macrophages with Schwann cells in human dental pulp, leading us to hypothesize that the laminin isoform of Schwann cells is associated with CD163 expression. The present study investigated the distribution of laminin isoforms in human dental pulp and the underlying mechanisms that affect macrophage phenotypes. Immunofluorescence analysis indicated that blood vessels were exclusively positive for laminin α4 and α5, whereas laminin α2 was associated with Schwann cells. Unexpectedly, laminin α3/laminin-332 (α3β3γ2) was detected on lymphatic vessels. In intact and carious teeth, CD163+ cells were associated with laminin α2, whereas CD206 single-positive cells were present inside, outside, and along blood vessels. In vitro incubation of THP-1 macrophages in plates coated with laminin-211/511 or its functionally analogous E8 fragments of α-chain (E8-α) indicated that cell shapes differed between macrophages grown on laminin-211/E8-α2 and macrophages grown on laminin-511/E8-α5. Laminin-211/E8-α2-coated plates upregulated CD163 expression, compared with laminin-511/E8-α5-coated plates. Integrin α3- and integrin α6-neutralizing Abs altered the shape of THP-1 macrophages and upregulated mRNA levels of CD206 and CD163 in macrophages grown on laminin-511; the neutralizing Abs did not affect macrophages grown on laminin-211. These findings suggest that laminin isoforms differentially regulate macrophage behavior via distinct integrin-laminin affinities. Of note, laminin-332 is expressed by pulpal lymphatic vessels, the existence of which has been debated; laminin-211 might have a role in maintaining CD163 expression on macrophages.

DOI： 10.4049/immunohorizons.2100110

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI  

We performed a comprehensive microbiome analysis of root caries lesions using 22 teeth extracted from patients with severe periodontitis. The carious lesions were mechanically collected and cryo-pulverized following tooth extraction. Differences in the microbiome were compared between independent lesions at the supragingival site (SG) and lesions extending beyond the gingival margin (GCB). DNA was extracted and the microbiome was characterized on the basis of the V3-V4 hypervariable region of the 16S rRNA gene using paired-end sequencing on an Illumina MiSeq device. The microbiota in root caries lesions showed compositionally distinct microbiota depending on the location. The most abundant OTUs in the SG group were Streptococcus (26.0%), Actinomyces (10.6%), and Prevotella (7.6%). GCB presented Prevotella (11.1%) as the most abundant genus, followed by Fusobacterium (9.6%) and Actinomyces (8.7%). The SG group showed a lack of uniformity in microbiota compared with the GCB group. The bacterial profiles of GCB varied considerably among patients, including periodontal pathogens such as Porphyromonas, Selenomonas, Filifactor, Peptococcus, and Tannerella. Periodontal pathogens inhabit root caries lesions that extend beyond the gingival margin. This study provides a new perspective for elucidating the microbial etiology of root caries.

DOI： 10.3390/microorganisms9112349

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：WILEY  

Resin monomers and polymerisation initiators have been shown to be cytotoxic for pulp cells and to disturb odontoblast differentiation. This study aimed to compare the effect of a resin-modified calcium silicate cement (TheraCal LC; TC) and a resin-free calcium silicate cement (ProRoot MTA; PR) on pulpal healing after pulpotomy. Pulpotomy was performed on the maxillary first molars of 8-week-old rats using either PR or TC. After 1, 3, 7, 14 and 28 days, pulpal responses were assessed by micro-computed tomography, haematoxylin-eosin staining and immunostaining against CD68, which is a pan-macrophage marker. The results showed that pulpotomy with TC induced persistent infiltration of inflammatory cells, including CD68-positive macrophages, and delayed the formation of reparative dentin as compared with that with PR, although both materials allowed pulpal healing over the long term. Therefore, resin-modified TC was not as biocompatible nor bioinductive as resin-free PR when applied on the healthy pulp of rat molars.

DOI： 10.1111/aej.12568

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

This study compared the apatite-forming ability (AFA) levels of flowable and putty formulations of Nishika Canal Sealer BG Multi (F-NBG and P-NBG, respectively) and attempted to clarify the cause of differences in the AFA levels of F-NBG and P-NBG. NBG samples were aged in simulated body fluid (SBF) or 1-, 5-, or 10-g/L bovine serum albumin-containing SBF (BSA-SBF) and analyzed in terms of their ultrastructures, elemental compositions, and Raman spectra to identify apatite formation. The phosphate ion consumption rates of NBG samples in the media were evaluated as an indicator of apatite growth. The original elemental composition, calcium ion release, and alkalizing ability levels of F-NBG and P-NBG were also evaluated. Apparent apatite formation was detected on all NBG samples except F-NBG aged in 10-g/L BSA-SBF. P-NBG consumed phosphate ions faster than F-NBG. As-prepared P-NBG showed more silicon elements on its surface than as-prepared F-NBG. P-NBG released more calcium ions than F-NBG, although their alkalizing ability levels did not differ statistically. In conclusion, the AFA of P-NBG was greater than that of F-NBG, probably because of the greater ability of P-NBG to expose silanol groups on the surface and release calcium ions.

DOI： 10.3390/app11198969

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SPRINGER HEIDELBERG  

OBJECTIVE: Bioceramic-containing root canal sealers promote periapical healing via Ca2+ and OH- release and apatite formation on the surface. This study aimed to compare Ca2+ and OH- release and in vivo apatite formation of three bioceramic-containing root canal sealers: EndoSequence BC sealer (Endo-BC), MTA Fillapex (MTA-F), and Nishika Canal Sealer BG (N-BG). MATERIALS AND METHODS: Polytetrafluoroethylene tubes filled with sealers were immersed in distilled water for 6 and 12 h and for 1, 7, 14, and 28 days to measure Ca2+ and OH- release. Additionally, tubes filled with sealers were implanted in the backs of rats for 28 days, and in vivo apatite formation was analyzed using an electron probe microanalyzer. RESULTS: Endo-BC released significantly more Ca2+ than the other sealers at 6 and 12 h and 1 day. Ca2+ release was significantly lower from N-BG than from Endo-BC and MTA-F at 14 and 28 days. OH- release was significantly higher from Endo-BC than from the other sealers throughout the experiment, except at 1 day. OH- release was lower from N-BG than from MTA-F at 6 h and 7 days. Only Endo-BC implants exhibited apatite-like calcium-, phosphorus-, oxygen-, and carbon-rich spherulites and apatite layer-like calcium- and phosphorus-rich, but radiopaque element-free, surface regions. CONCLUSIONS: Ca2+ and OH- release is ranked as follows: Endo-BC > MTA-F > N-BG. Only Endo-BC demonstrated in vivo apatite formation. CLINICAL RELEVANCE: Endo-BC could promote faster periapical healing than MTA-F and N-BG.

DOI： 10.1007/s00784-021-04118-w

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI  

This study aimed to evaluate the anticariogenic biofilm activity of a novel zinc-containing glass ionomer cement, Caredyne Restore (CR), using a flow-cell system that reproduces Stephan responses. Streptococcus mutans biofilms were cultured on either CR or hydroxyapatite (HA) discs mounted on a modified Robbins device. The media were allowed to flow at a speed of 2 mL/min for 24 h while exposed to an acidic buffer twice for 30 min to mimic dietary uptake. Acid exposure enhanced biofilm inhibition in the CR group, which showed 2.6 log CFU/mm2 in viable cells and a 2 log copies/mL reduction in total cells compared to the untreated group after 24 h of incubation, suggesting enhanced anticariogenic activity due to the release of fluoride and zinc ions. However, there was no difference in the number of viable and total cells between the two experimental groups after 24 h of incubation in the absence of an acidic environment. The anticariogenic biofilm activity of CR occurs in acidic oral environments, for example in the transient pH drop following dietary uptake. CR restorations are recommended in patients at high risk of caries due to hyposalivation, difficulty brushing, and frequent sugar intake.

DOI： 10.3390/antibiotics10080977

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：NATURE RESEARCH  

When regenerative endodontic procedures (REPs) are performed on immature teeth diagnosed with pulp necrosis and apical periodontitis, various healing patterns occur. Furthermore, infected immature teeth with endodontic disorders often exhibit some remnant pulp and apical tissue. Therefore, this study investigated the impact of remnant healthy or fully functional pulp and apical tissue on healing patterns after REPs. Simulated REPs were performed on non-infected immature rat molars with different amounts of remnant pulp and apical tissue. Healing patterns in these teeth were assessed after 28 days. Teeth with 0.81-0.91 mm of remnant pulp healed with pulp-like tissue, dentin, and osteodentin-like dentin-associated mineralized tissue (OSD-DAMT); teeth with 0.60-0.63 mm of remnant pulp healed with pulp-like tissue and OSD-DAMT; teeth with 0.13-0.43 mm of remnant pulp healed with periodontal ligament (PDL)-like tissue, OSD-DAMT, and cementum-like dentin-associated mineralized tissue (CEM-DAMT); and teeth with disorganization of pulp and apical tissues at 0.15-0.38 mm beyond the root apex healed with PDL-like tissue, CEM-DAMT, and intracanal bone (IB). Loss of Hertwig's epithelial root sheath was observed with IB formation. These results showed that four distinct healing patterns occurred after REPs, depending on the preoperative amount of remnant healthy pulp and apical tissue.

DOI： 10.1038/s41598-020-78022-w

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Macrophages are immune cells with high plasticity that perform many functions related to tissue injury and repair. They are generally categorized as 2 functional phenotypes: M1 (proinflammatory) and M2 (anti-inflammatory and prohealing). To investigate the role of macrophages in human dental pulp, we examined the localization and distributional alterations of macrophages in healthy dental pulp as well as during the reparative process of pulp capping with mineral trioxide aggregate (MTA) and in cariously inflamed pulp of adult human teeth. We also quantified the populations of M1/M2 macrophages in healthy dental pulp by flow cytometric analysis. CD68+CD86+ cells (M1 phenotype) and CD68+CD163+ cells (M2 phenotype) were 2.11% ± 0.50% and 44.99% ± 2.22%, respectively, of 2.96% ± 0.41% CD68+ cells (pan-macrophages) in whole healthy dental pulp. Interestingly, M2 phenotype macrophages were associated with Schwann cells in healthy pulp, during mineralized bridge formation, and in pulp with carious infections in vivo. Furthermore, the M2 macrophages associated with Schwann cells expressed brain-derived neurotrophic factor (BDNF) under all in vivo conditions. Moreover, we found that plasma cells expressed BDNF. Coculture of Schwann cells isolated from human dental pulp and human monocytic cell line THP-1 showed that Schwann cells induced M2 phenotypic polarization of THP-1 cell-derived macrophages. The THP-1 macrophages that maintained contact with Schwann cells were stimulated, leading to elongation of their cell shape and expression of M2 phenotype marker CD163 in cocultures. In summary, we revealed the spatiotemporal localization of macrophages and potent induction of the M2 phenotype by Schwann cells in human dental pulp. M2 macrophages protect neural elements, whereas M1 cells promote neuronal destruction. Therefore, suppressing the neurodestructive M1 phenotype and maintaining the neuroprotective M2 phenotype of macrophages by Schwann cells may be critical for development of effective treatment strategies to maintain the viability of highly innervated dental pulp.

DOI： 10.1177/0022034519894957

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：WILEY  

OBJECTIVES: To determine glucose transporter 1 (GLUT1) and runt-related transcription factor 2 (RUNX2) expression during reparative dentinogenesis after pulpotomy with mineral trioxide aggregate (MTA) capping. SUBJECTS AND METHODS: Eight-week-old male Wistar rats were used. Pulp of the upper left first molar was exposed and capped with MTA. The upper right first molar of the same animal was used as a control. After collecting molars at various time points, GLUT1, RUNX2 and mammalian target of rapamycin (MTOR) were examined by immunohistochemistry. mRNA levels of Slc2a1 (encoding GLUT1), Runx2, Nestin and Mtor were determined by real-time PCR. RESULTS: Pulp exhibited progressive formation of reparative dentine lined with GLUT1- and MTOR-immunoreactive odontoblast-like cells at 5 days after pulpotomy. RUNX2 was detected in nuclei of most pulp tissue cells at day 5 after pulpotomy. Double immunofluorescence staining revealed GLUT1 immunoreactivity on odontoblast-like cells positive for Nestin or RUNX2, 5 days after pulpotomy. Slc2a1, Runx2, Nestin and Mtor mRNA levels were significantly upregulated on days 3-5 after pulpotomy. CONCLUSIONS: After rat molar pulpotomy, dental pulp induced formation of reparative dentine with colocalization of GLUT1 and Nestin or RUNX2. Moreover, mRNA levels of Slc2a1, Runx2, Nestin and Mtor were significantly upregulated in pulpotomized dental pulp.

DOI： 10.1111/odi.13230

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

INTRODUCTION: Pulp capping materials allow healing of injured pulp with a layer of reparative dentin. Glucose is needed to cure the injured area. Glucose is transported by glucose transporter (Glut) 2 and Glut4, which are transmembrane proteins that act as gatekeepers. We hypothesized that the transport of glucose via Glut2/Glut4 might contribute to the production of a dentin bridge during wound healing. Therefore, we explored Glut2 and Glut4 expression during reparative dentinogenesis after mineral trioxide aggregate capping. METHODS: The upper left first molar of 8-week-old Wistar rats underwent pulpotomy with mineral trioxide aggregate. At 1, 3, 5, 7, and 14 days after treatment, localization and colocalization of Glut2, Glut4, nestin (odontoblast marker), and antiendothelial cell antigen 1 (RECA-1; endothelial cell marker) were analyzed with immunohistochemical staining. Messenger RNA expression levels of Slc2a2 (encoding Glut2), Slc2a4 (encoding Glut4), Igf-1r (encoding insulinlike growth factor 1 receptor), and nestin were analyzed in the extracted teeth using real-time polymerase chain reaction. RESULTS: Glut2 and Glut4 were localized within odontoblasts and endothelial cells in normal control teeth. Three days after pulpotomy, Glut2- and Glut4-positive cells were detected; 7 days after pulpotomy, immunoreactivity for Glut2 and Glut4 was confined to newly differentiated odontoblastlike cells arranged beneath reparative dentin. Messenger RNA expression levels of Slc2a2 and Slc2a4 were significantly up-regulated after pulpotomy. CONCLUSIONS: Glut2 and Glut4 regulate glucose transport during wound healing beneath the injured area. This may contribute to the development of new vital pulp therapy for patients with deep caries.

DOI： 10.1016/j.joen.2019.10.003

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

AIM: To explore the expression profile of CD45+/pro-collagen I+ fibrocytes in intact dental pulps as well as during wound healing in adult dental pulp tissue. METHODOLOGY: A total of 16 healthy permanent teeth were obtained from young patients (18 to 25 years) undergoing orthodontic treatment. Routine pulp capping with mineral trioxide aggregate (MTA) was performed under local anaesthesia to induce a mineralized barrier at the exposed surface. Teeth were extracted from patients after 7, 14 and 35 days. Sections of the extracted teeth were prepared and stained for various markers using indirect immunofluorescence. Fibrocytes were counted, and the data were statistically evaluated using the Dunnett test. RESULTS: In uninflammed pulp tissue, a pro-collagen I-positive reaction was detected in odontoblasts, as well as in perivascular cells. Most of the CD45-positive cells were negative for pro-collagen I in normal pulp tissue, whereas CD45+/pro-collagen I+ fibrocytes were detected 7 days after injury. At day 14, fibrocytes were recognized under the fibrous matrix in contact with MTA and had infiltrated into regions of new capillary formation, where the fibrocytes were positively stained for vascular endothelial growth factor. By 35 days, fibrocytes were few, coincident with the formation of dentine bridges. The number of fibrocytes peaked 7 days post-injury and decreased at 14 days. CONCLUSIONS: The presence of fibrocytes in human pulp wound healing was observed. The spatiotemporal distribution of fibrocytes suggests that fibrocytes are involved in the early stages of pulp wound healing, specifically by contributing to new blood vessel formation.

DOI： 10.1111/iej.12940

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：WILEY  

AimTo evaluate the abilities of three calcium silicate-based pulp-capping materials (ProRoot MTA, TheraCal LC and a prototype tricalcium silicate cement) to produce apatite-like precipitates after being subcutaneously implanted into rats.
MethodologyPolytetrafluoroethylene tubes containing each material were subcutaneously implanted into the backs of Wistar rats. At 7, 14 and 28days post-implantation, the implants were removed together with the surrounding connective tissue, and fixed in 2.5% glutaraldehyde in cacodylate buffer. The chemical compositions of the surface precipitates formed on the implants were analysed with scanning electron microscopy-electron probe microanalysis (SEM-EPMA). The distributions of calcium (Ca) and phosphorus (P) at the material-tissue interface were also analysed with SEM-EPMA. Comparisons of the thicknesses of the Ca- and P-rich areas were performed using the Friedman test followed by Scheffe's test at a significant level of 5%.
ResultsAll three materials produced apatite-like surface precipitates containing Ca and P. For each material, elemental mapping detected a region of connective tissue in which the concentrations of Ca and P were higher than those in the surrounding connective tissue. The thickness of this Ca- and P-rich region exhibited the following pattern: ProRoot MTA > prototype tricalcium silicate cementTheraCal LC. ProRoot MTA had a significantly thicker layer of Ca and P than the other materials at all time-points (P<0.05), and a significant difference was detected between the prototype cement and TheraCal LC at 28days (P<0.05).
ConclusionAfter being subcutaneously implanted, all of the materials produced Ca- and P-containing surface precipitates and a Ca- and P-rich layer within the surrounding tissue. The thickness of the Ca- and P-rich layer of ProRoot MTA was significantly thicker than that of the other materials.

DOI： 10.1111/iej.12802

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：NATURE PUBLISHING GROUP  

Mineral trioxide aggregate (MTA) is a commonly used dental pulp-capping material with known effects in promoting reparative dentinogenesis. However, the mechanism by which MTA induces dentine repair remains unclear. The aim of the present study was to investigate the role of prostaglandin E2 (PGE2) in dentine repair by examining the localisation and mRNA expression levels of its transporter (Pgt) and two of its receptors (Ep2 and Ep4) in a rat model of pulpotomy with MTA capping. Ep2 expression was detected in odontoblasts, endothelial cells, and nerve fibres in normal and pulpotomised tissues, whereas Pgt and Ep4 were immunolocalised only in the odontoblasts. Moreover, mRNA expression of Slco2a1 (encoding Pgt), Ptger2 (encoding Ep2), and Ptger4 (encoding Ep4) was significantly upregulated in pulpotomised dental pulp and trigeminal ganglia after MTA capping. Our results provide insights into the functions of PGE2 via Pgt and Ep receptors in the healing dentine/pulp complex and may be helpful in developing new therapeutic targets for dental disease.

DOI： 10.1038/s41598-017-07167-y

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

Introduction: Myofibroblasts express alpha smooth muscle actin (alpha-SMA) and play a critical role in wound healing. Myofibroblast differentiation is controlled by the joint actions of transforming growth factor beta 1 (TGF-beta 1) and the extradomain A fibronectin splice variant (EDA-FN). Currently, the contribution of myofi-broblasts to dental pulp healing is unknown. Therefore, we analyzed expressional characteristics of alpha-SMA positive cells and investigated TGF-beta 1, EDA-FN, and alpha-SMA expression levels after pulpotomy to better understand dental pulp healing. Methods: The maxillary first molars of 8-week-old Wistar rats were pulpotomized with mineral trioxide aggregate. After 1 to 14 days, localization and colocalization of alpha-SMA, rat endothelial cell antigen-1 (as a marker of endothelial cells), neuron-glial antigen 2 (as a marker of perivascular cells), prolyl-4-hydroxylase (P4H, as an additional marker of myofibroblasts), and EDA-FN were analyzed using immunohistochemistry and double immunofluorescence. Time-course changes in the messenger RNA expression levels of TGF-beta 1, EDA-FN, and alpha-SMA were evaluated using quantitative real-time polymerase chain reaction analysis. Results: Spindle-shaped alpha-SMA positive cells transiently appeared after pulpotomy. These cells initially emerged in the pulp core on day 3 and then accumulated at the wound site by day 5. These cells were isolated from rat endothelial cell antigen-1 positive cells and did not express neuron-glial antigen 2 but did express P4H. The messenger RNA levels of TGF-beta 1, EDA-FN, and alpha-SMA were significantly up-regulated after pulpotomy. EDA-FN and a-SMA were colocalized at the wound sites on day 5. Conclusions: In association with up regulation of TGF-beta 1 and EDA-FN expression, alpha-SMA and P4H double-positive cells accumulated at the wound sites after pulpotomy. This suggests that myofibroblasts participate in dental pulp healing.

DOI： 10.1016/j.joen.2017.02.018

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

目的:近年注目されている接着性レジンシーラーは根管壁象牙質への接着性が謳われる一方で,再根管治療時の除去が困難となることが懸念されている.そこで,比較的容易に除去可能な4-META含有レジンシーラー(メタシールSoft)が開発されたが,その生体親和性についての知見は十分とはいえない.本研究では,同シーラーをラット背部皮下に埋入後,局所に浸潤する炎症性細胞の分布密度を免疫組織化学的に定量することにより,生体親和性を評価した.材料と方法:被験レジン系シーラーとしてメタシールSoft,対照材料としてエポキシレジン系シーラー(AHプラス)および酸化亜鉛ユージノール系シーラー(キャナルス)を使用した.滅菌PTFEチューブに練和したシーラーを填入し,ただちに4週齢Wistar系雄性ラット(各観察期間ともn=5)の背部皮下組織内に埋入した.コントロールとしてシーラーを填入していない滅菌PTFEチューブを用いた.7,14,28日後に皮下組織を切り出し,4%パラホルムアルデヒド溶液で24時間浸漬固定し,凍結切片を作成後,H-E染色による組織学的観察を行うとともに,マクロファージ,好中球の局在についてそれぞれCD68,CD43を一次抗体として酵素抗体染色を行い観察した.さらに,チューブ開口部と接する組織内における陽性細胞の密度を求め,統計学的に分析した(一元配置分散分析およびBonferroni Dunn検定,α=0.05).結果:H-E染色では,すべての実験群において,7日経過例でチューブ開口部を中心とした炎症性細胞の浸潤が認められたが,時間の経過とともに炎症性細胞は減少し,線維組織による被包が観察された.メタシールSoft群ではシーラーの溢出がしばしば組織内に観察され,28日経過例においてもその残存が認められた.定量解析の結果,CD68陽性細胞については7日経過例でキャナルス群がコントロール群より有意に高い値を示したが,14,28日経過例においては各群間で有意差は認めなかった.CD43陽性細胞については,7,14日経過例でメタシールSoft群がキャナルス群より有意に低い値を示した.28日経過例では,各群間で有意差は認めなかった.結論:ラット皮下結合組織においては,4-META含有レジン系シーラーは酸化亜鉛ユージノール系シーラーと比較して,軽微な好中球浸潤を誘発することが示された.(著者抄録)

DOI： 10.11471/shikahozon.59.65

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：SAGE PUBLICATIONS LTD  

Myofibroblasts and extracellular matrix are important components in wound healing. Alpha-smooth muscle actin (-SMA) is a marker of myofibroblasts. Fibrillin-1 is a major constituent of microfibrils and an extracellular-regulator of TGF-1, an important cytokine in the transdifferentiation of resident fibroblasts into myofibroblasts. To study the correlation between changes in fibrillin-1 expression and myofibroblast differentiation, we examined alterations in fibrillin-1 and -SMA expression in organotypic cultures of dental pulp in vitro. Extracted healthy human teeth were cut to 1-mm-thick slices and cultured for 7 days. In intact dental pulp, fibrillin-1 was broadly distributed, and -SMA was observed in pericytes and vascular smooth muscle cells. After 7 days of culture, immunostaining for fibrillin-1 became faint concomitant with a downregulation in its mRNA levels. Furthermore, fibroblasts, odontoblasts and Schwann cells were immunoreactive for -SMA with a significant increase in -SMA mRNA expression. Double immunofluorescence staining was positive for pSmad2/3, central mediators of TGF- signaling, and -SMA. The administration of inhibitors for extracellular matrix proteases recovered fibrillin-1 immunostaining; moreover, fibroblasts lost their immunoreactivity for -SMA along with a downregulation in -SMA mRNA. These findings suggest that the expression of -SMA is TGF-1 dependent, and fibrillin-1 degradation and downregulation might be implicated in the differentiation of myofibroblasts in dental pulp wound healing.

DOI： 10.1369/0022155415580622

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：英語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：英語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：(一社)歯科基礎医学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：新潟歯学会  

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記述言語：日本語   出版者・発行元：新潟歯学会  

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：新潟歯学会  

根尖性歯周組織病変の難治化は、根尖部での複雑な解剖学的問題に加え、残存バイオフィルムによる細菌学的な影響もあるとされている。こうした様々な要因の改善策として外科的歯内療法が選択される。しかし、補綴処置を行う上で考慮する歯冠・歯根長比の問題で複数回に渡り歯根切断が行われることは稀である。今回は、歯根尖切除術を過去3度に渡って施行しても治癒しなかった症例に対して、マイクロスコープの使用下で再歯根尖切除術と根尖部の緊密な封鎖を目的としたmineral trioxide aggregate(以下MTA)による逆根管充填を含めた再外科的歯内療法が奏効した症例を報告する。患者は59歳の女性で、上顎右側中切歯および側切歯に対して打診痛、根尖部圧痛および瘻孔を認める慢性根尖膿瘍と診断し、最初に通常の感染根管治療を行った。その後、病変部の治癒が期待できなかったため歯根尖切除を行い、逆根管形成後にMTAで逆根管充填を行った。手術から1ヵ月後で瘻孔は消失し、さらに6ヵ月後のレントゲン写真では根尖部の透過像が消失しており、治癒傾向を認めた。(著者抄録)

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記述言語：日本語   出版者・発行元：新潟歯学会  

根尖性歯周組織病変の難治化は、根尖部での複雑な解剖学的問題に加え、残存バイオフィルムによる細菌学的な影響もあるとされている。こうした様々な要因の改善策として外科的歯内療法が選択される。しかし、補綴処置を行う上で考慮する歯冠・歯根長比の問題で複数回に渡り歯根切断が行われることは稀である。今回は、歯根尖切除術を過去3度に渡って施行しても治癒しなかった症例に対して、マイクロスコープの使用下で再歯根尖切除術と根尖部の緊密な封鎖を目的としたmineral trioxide aggregate(以下MTA)による逆根管充填を含めた再外科的歯内療法が奏効した症例を報告する。患者は59歳の女性で、上顎右側中切歯および側切歯に対して打診痛、根尖部圧痛および瘻孔を認める慢性根尖膿瘍と診断し、最初に通常の感染根管治療を行った。その後、病変部の治癒が期待できなかったため歯根尖切除を行い、逆根管形成後にMTAで逆根管充填を行った。手術から1ヵ月後で瘻孔は消失し、さらに6ヵ月後のレントゲン写真では根尖部の透過像が消失しており、治癒傾向を認めた。(著者抄録)

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(一社)歯科基礎医学会  

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記述言語：日本語   出版者・発行元：新潟歯学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(公社)日本歯科医師会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：日本歯内療法学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：新潟歯学会  

researchmap

記述言語：日本語   出版者・発行元：(NPO)日本歯科保存学会  

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記述言語：日本語   出版者・発行元：(一社)歯科基礎医学会  

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J-GLOBAL

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