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At least 739 records · Page 41Linked to original sources
PubMed1992

[The nerve fiber projection of trigeminal ganglion cell to dental pulp, dentine and periodontal membrane in the rat].

The nerve fiber projection of the trigeminal ganglion cell to dental pulp, dentine and periodontal membrane was investigated with the technique of anterograde radioautographic neuroanatomical tracing (ARNT) in the rat. Results showed that the innervation in dentine and pulp was not uniform. The nerve endings were most numerous in the pulp horn, and in the tubular dentine of the cusp and cervical regions. In the periodontal membrane, both large- and small-diameter nerve fibers were found. And at least part of the innervation in the periodontal membrane was of trigeminal ganglion origin.

Animals↗
PubMed1996

[Damage to the dental pulp by composite bonding systems: leakage or toxicity].

The fourth generation bonding systems demonstrate an excellent adhesion to the dental hard tissues. The marginal seal along the composite-resin restoration does, however, not totally prevent microleakage and, moreover, the bonding system may deteriorate with time. Due to the attention that has been given to possible microleakage, the toxic effects of composite and its components have got less attention in recent years. The present article deals with the question whether the dental pulp is damaged by either microleakage and/or components of the bonding system.

Adhesives↗
PubMed2005

Adhesive resin and the hydrophilic monomer HEMA induce VEGF expression on dental pulp cells and macrophages.

Vascular endothelial growth factor (VEGF) plays an important role in angiogenesis by inducing endothelial cell proliferation, migration and survival. Direct pulp capping with an adhesive resin system was shown to induce local increase in blood vessel density and lack of dentin bridging. However, the mechanisms involved in the increase in blood vessel density observed near the pulp exposures capped with an adhesive resin are largely unknown. OBJECTIVES.: To investigate the effect of an adhesive resin or one of its hydrophilic monomers (HEMA), in the expression of VEGF by pulp cells. METHODS.: Mouse odontoblast-like cells (MDPC-23), undifferentiated pulp cells (OD-21), gingival fibroblasts, and macrophages were exposed to SingleBond (3M) or to 0-1000nM HEMA. VEGF expression was evaluated by ELISA and semi-quantitative RT-PCR. RESULTS AND SIGNIFICANCE.: VEGF expression was upregulated in MDPC-23 cells exposed to HEMA (p<0.001) or to SingleBond (p<0.018), and in macrophages exposed to HEMA (p<0.001) or SingleBond (p=0.001). In contrast, VEGF expression remained unchanged in undifferentiated pulp cells (OD-21), or fibroblasts exposed to either HEMA or Single Bond (p>0.05). Treatment with SingleBond or HEMA did not affect VEGF expression at the mRNA level of any cell type evaluated here, suggesting that the induction of VEGF expression in these cells is regulated primarily at the post-transcriptional level. These findings suggest that VEGF is involved in the regulation of pulp neovascularization observed in response to the application of adhesive resins at site of pulp exposure.

Analysis of Variance↗
PubMed1999

Effect of retinoic acid on osteopontin expression in rat clonal dental pulp cells.

We studied the effect of retinoic acid on osteopontin synthesis and the mRNA expression in rat clonal dental pulp cells, RPC-C2A. An immunoprecipitation assay clarified that retinoic acid caused an increase in phosphorylated osteopontin synthesis that was dose-dependent, and marked increases were observed at retinoic acid concentrations of 10(-6) to 10(-5) M (1.7-fold). A Northern blotting analysis revealed a similar pattern of increase in osteopontin mRNA expression of up to 6.2-fold of control levels. Because osteopontin has an important role in the mineralization process, these results suggest that retinoic acid regulates mineralization, which takes place in the pulp cavity, including reparative dentin formation.

Animals↗
PubMed1989

Microwave irradiation as a form of fixation for dental pulp.

This study investigated developments in microwave energy fixation and the general applicability of microwave fixation to studies of dental pulp. Rat mandibles with incisors were dissected out and immersed in various solutions before and after exposure to microwave energy. Histological examination showed no combination with microwave fixation to be equal in quality to control tissues fixed in formalin. Inferior but satisfactory results could be achieved by immersion of tissues in formalin after microwave irradiation, a step thought to protect the microwave fixed tissue from subsequent damage caused by decalcification. Good fixation of tissues outside the pulp was achieved using microwave energy. Further investigation is required to perfect microwave fixation of pulpal tissue.

Animals↗
PubMed1992

Effect of substance P administration on vascular permeability in the rat dental pulp and submandibular gland.

The effects of substance P (SP) administration on vascular permeability were studied in the dental pulp (DP) of upper and lower incisors and in the submandibular gland (SMG) of male rats. Vascular permeability was assessed by means of extravasation of Evans blue dye. SP was diluted in 0.5% bovine serum albumin (BSE) and infused into the left common carotid artery. Separate groups of animals receive chloropyramine, an H1 histamine receptor antagonist (10 mg kg-1 i.v.) or indomethacin, a prostaglandin synthesis inhibitor (4 mg kg-1 i.v.) prior to SP infusions. Infusion of SP for 5 min increased plasma extravasation both in DP and SMG, with a threshold of about 30 pmol min-1 and 74 pmol min-1, respectively. Enhanced salivary secretion was also observed. Although the administration of 74 pmol min-1 of SP significantly lowered the systemic blood pressure, experimental hypotension elicited by haemorrhage did not influence vascular permeability in either organ tested. After chloropyramine administration the SP effect on vascular permeability in both DP and SMG was abolished. Indomethacin pretreatment failed to prevent the permeability-enhancing action of SP. Our results suggest that substance P increases both pulpal and glandular plasma extravasation in the rat indirectly, via the release of histamine and the activation of H1 histamine receptors.

Animals↗
PubMed1996

Interleukin-8 gene expression by human dental pulp fibroblast in cultures stimulated with Prevotella intermedia lipopolysaccharide.

Interleukin (IL)-8 mRNA expression was investigated in human dental pulp fibroblast cultures after stimulation with lipopolysaccharide (LPS) prepared from Prevotella intermedia and inflammatory cytokines. The expression of IL-8 mRNA and the release of IL-8 induced by P. intermedia LPS in pulpal fibroblast cultures were detected by Northern blot analysis and ELISA, respectively. The sufficient concentration of P. intermedia LPS on the IL-8 mRNA expression was 0.1 microgram/ml in pulpal fibroblast cultures. IL-8 mRNA levels began to increase after 2 h of exposure, reached a maximum at 4 to 8 h, and declined after 48 h, reaching the unstimulated level by 60 h. IL-8 production by the pulpal fibroblasts began to increase after 8 h of exposure upon stimulation with 10 microgram/ml of P. intermedia LPS. By contrast Salmonella LPS and synthetic lipid A did not increase IL-8 mRNA concentrations in pulpal fibroblast cultures. Recombinant human IL-1 alpha, beta, and tumor necrosis factor-alpha were capable of stimulating these cells to express IL-8 mRNA but natural human interferon-beta, gamma, and recombinant human IL-6 were incapable in our assay. These results suggest that pulpal fibroblasts are immunoresponsive cells and can elaborate IL-8 upon stimulation with P. intermedia LPS.

Adolescent↗
PubMed2006

The influence of haemostatic agents on healing of healthy human dental pulp tissue capped with calcium hydroxide.

AIM: To investigate the hypothesis that different haemostatic agents could impair the histological response of human pulps capped with calcium hydroxide. METHODOLOGY: Forty-five third molars scheduled for extraction were selected. Class I cavities with pulp exposures were prepared. Three agents were used to control bleeding: 0.9% saline solution (control, n = 14), 5.25% sodium hypochlorite (n = 16) and 2% chlorhexidine digluconate (n = 15). The pulps were dressed with hard-setting calcium hydroxide cement. After 7, 30 or 90 days, teeth were extracted, formalin-fixed and prepared for histochemical techniques. The biological response was categorized using the following criteria: inflammatory response, soft tissue organization, reactionary dentine and reparative dentine. Data were submitted to statistical analysis, using nonparametric Kruskal-Wallis one-way analysis of variance on ranks. Differences amongst groups were detected using Dunn's method. RESULTS: The statistical analysis disclosed that whilst inflammatory response decreased over time, reactionary dentine deposition and reparative dentine formation increased in the latter periods of evaluation (P < 0.05). The three agents had similar performances for all criteria evaluated. The conventional pulp response to calcium hydroxide was observed over time, and complete pulp healing was observed in 88% of the specimens after 90 days. CONCLUSION: The three haemostatic agents did not impair the healing process following pulp exposure and capping with calcium hydroxide at different time intervals investigated.

Adult↗