Search results for "PULP"

Alkyl polychlorobibenzyls and planar aromatic chlorocompounds in pulp mill products, effluents, sludges and exposed biota

1992

Abstract Aromatic chlorocompounds which interfere in GC/MS analysis of dioxins were studied in samples from three different pulp mills and in fish and mussels exposed to pulp mill effluents. The major interfering compounds were chlorinated alkyl bibenzyls (R-PCBBs; R = C5-alkyl; P = 1–4). In pulp mill samples, levels of C5-PCBBs (10–120 ng/l in effluents, 5–33 ng/g in dried sludges) were orders of magnitude higher than the levels of toxic PCDDs and PCDFs. C5-PCBBs bioaccumulated slightly to the recipient fish (0–2 pg/g in fresh muscles) and to incubated mussels (3–26 ng/g in lipid). In mussels, significant levels (19–73 ng/g in lipid) of other than pulp mill originated toxic hepta- and octa…

Thermographic Analysis of Tooth Vascularization Using Thermal Stimulation

2018

Objective: The current pulp diagnostic techniques based on subjective patient response to electrical or thermal stimuli are unable to assess tooth vascularization, which is a true indicator of pulp vitality. The present study evaluates thermography as a pulp vitality test, assessing tooth recovery following thermal stimulation. Methods: A model simulating intrapulpal circulation was developed. Superficial thermographic measurements were obtained from teeth with and without elevation of the intracoronal temperature before and after applying thermal stress with cold. The data were analyzed using analysis of variance (ANOVA), and the level of significance was set at P<0.05. Results: The model …

Pulpiti lignei

2019

Questo catalogo nasce con l’intento di individuare, attraverso la circolazione di incisioni e di disegni, la fitta rete di relazioni che legano l’architettura prodotta tra Seicento e Settecento nel Val di Noto ad un contesto più ampio. Le incisioni costituirono per architetti e costruttori un apparato di forme da replicare o a cui ispirarsi, assumendo il ruolo ambasciatrici di un linguaggio destinato ad essere “condiviso” tra diverse aree culturali. Il catalogo ruota intorno a quarantuno materiali grafici (disegni e incisioni) provenienti da una collezione privata, integrati con riproduzioni e fotografie. L’organizzazione è suddivisa in nove sezioni tematiche diverse per scala e tipologie. …

Alginate-Agarose Hydrogels Improve the In Vitro Differentiation of Human Dental Pulp Stem Cells in Chondrocytes. A Histological Study

2021

[EN] Matrix-assisted autologous chondrocyte implantation (MACI) has shown promising results for cartilage repair, combining cultured chondrocytes and hydrogels, including alginate. The ability of chondrocytes for MACI is limited by different factors including donor site morbidity, dedifferentiation, limited lifespan or poor proliferation in vitro. Mesenchymal stem cells could represent an alternative for cartilage regeneration. In this study, we propose a MACI scaffold consisting of a mixed alginate-agarose hydrogel in combination with human dental pulp stem cells (hDPSCs), suitable for cartilage regeneration. Scaffolds were characterized according to their rheological properties, and their…

Comparison of dental treatment performed under general anesthesia between healthy children and children with special health care needs in a hospital …

2018

Background The aim of this retrospective study was to assess and compare the dental treatments performed under general anesthesia (GA) between healthy children and children with special health care needs (SHCN) according to age group and gender at king Fahd hospital, Dhahran, Saudi Arabia. Material and Methods Data was retrieved from the records of 304 healthy and SHCN children 1 18 years of age who received dental rehabilitation under GA in the period 2015-2018. The dental treatment modalities were compared in the two groups and differences according to age group and gender were reported. Results Compared to healthy children, children with SHCN received significantly less pulp therapy trea…

Activity of laccase on unbleached and bleached thermomechanical pulp

2003

The introduction of value-added properties to pulp fibres is an attractive proposition. One interesting option is targeted modification of fibre surfaces by enzymatic activation. In this work, the activity of laccase on pulp and pulp fractions from thermomechanical pulp (TMP) and peroxide bleached TMP was studied on the basis of consumption of the co-substrate oxygen in the reaction and by studying the formation of radicals in the pulp material as analysed by electron paramagnetic resonance spectroscopy (EPR). Laccases obtained from Trametes hirsuta and Myceliophthora thermophila were used in the study. Laccases were found to be active on pulp material of unbleached TMP, whereas only fines …

The importance of bioceramics and computed tomography in the late clinical management of a horizontal root fracture : a case report

2020

Root fractures resulting from dental trauma involve dentin, cementum and pulp. The present study aimed to demonstrate the importance of cone-beam computed tomography (CBTC) and bioceramics in the correct planning and intervention of a horizontal root fracture case in tooth 11 with late treatment in an 18-year-old patient. Clinical and radiographic examinations revealed tooth displacement, pain on vertical percussion and images suggestive of a horizontal root fracture. Pulp necrosis was diagnosed and CBTC was requested for treatment planning. Subsequently, endodontic treatment was performed using a bioceramic apical plug. A 2-year follow-up indicated the absence of root resorption and normal…

The wolf in sheep’s clothing: microtomographic aspects of clinically incipient radiation-related caries

2015

Background: Radiation-related caries (RRC) can cause rapid progression, with a high potential for dental destruction affecting mainly cervical and incisal areas. Unlike the injuries that occur in the conventional caries, incipient RRC present in unusual surfaces have difficult diagnosis and classification stages of cavitation. Material and Methods: Evaluate the radiographic patterns of demineralization of RRC by using micro-CT. Ten teeth with incipient RRC and 10 teeth with incipient conventional caries (control group) matched by anatomic teeth group and caries affected surfaces were evaluated by X-ray microtomography (micro-CT) Skyscan 1174V2 (50Kv, 1.3 megapixel, Kontich, Belgium). Teeth …

Reazioni pulpari alla malattia parodontale: studio istologico e istobatteriologico

2003

Dentin tubule orientation determines odontoblastic differentiation in vitro: A morphological study.

2019

Odontoblasts are post-mitotic cells responsible for maintenance of the dentin, and are therefore important for dental health. In some cases, irreversible pulpitis leads to necrosis and consequently death of odontoblasts. Regenerative endodontics (RE) uses the concept of tissue engineering to restore the root canals to a healthy state, allowing for continued development of the root and surrounding tissue. Human dental pulp stem cells (hDPSCs) have been successfully used in RE to restore odontoblast function. Surface microgeometry is one of the most important factors involved in the induction of differentiation of hDPSCs into odontoblast-like cells. Although different authors have demonstrate…