Use Of Calcium Hydroxide Research Articles

Management Of Large Periapical Lesion With A Noninvasive Approach: A Case Report

Periapical lesions develop as a sequela to pulpal diseases. The majority of inflammatory periapical lesions are initially treated with conservative non-surgical procedures. The success of root canal treatment is based on thorough cleaning, shaping and obturation of the root canal system. Calcium hydroxide and triple antibiotic paste (TAP) are recommended as intracanal medicaments due to its antibacterial properties. This case report describes the non-surgical management of a large cyst-like periapical lesion in relation to the maxillary lateral incisor of a 19-year-old male with the chief complaint of periodic swelling and pus drainage from the palatine region with a history of a traumatic accident in the same area. The present case highlights the use of calcium hydroxide and TAP as an interappointment endodontic dressing for non-surgical management of large periapical radiolucency, which resulted in favourable clinical and radiographic outcomes

Assessing Cell Viability: Comparative Analysis of Calcium Hydroxide, Triple Antibiotic Paste, and Their Synergistic Impact on human Dental Pulp Stem Cells

Abstract Objective The American Association of Endodontists recommends the use of calcium hydroxide (Ca(OH)2) or triple antibiotic paste (TAP) as preferred medicaments in regenerative endodontic treatment. Although both medicaments showed an excellent antibacterial property, their impact on the viability of human dental pulp stem cells (hDPSCs) when used in combination remains uncertain. Previous studies have indicated that at certain concentrations, both Ca(OH)2 and TAP can be harmful to cells. Therefore, it is aimed to assess the effects of Ca(OH)2, TAP, and their combined application on the viability of hDPSCs in this study. Materials and Methods Primary cultured hDPSCs, reaching 80% confluency and at passages 3rd to 4th, were subjected to 24-hour starvation. Subsequently, they were cultured in media supplemented with Ca(OH)2, TAP at 0.1 and 1 mg/mL concentrations, and a combination of Ca(OH)2 and TAP at equivalent concentrations, with Dulbecco's modified eagle medium serving as the control group. The viability and morphology of hDPSCs were assessed using both the quantitative 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay and qualitative 4',6-diamidino-2-phenylindole staining. Statistical Analysis First, the data were analyzed by one-way analysis of variance, followed by Bonferroni post hoc to compare between groups. All the tests were conducted at a significance level of 95% (p < 0.05). Results In this study, a notable variation in hDPSCs viability was observed among all groups, with the lowest viability recorded in the combination of Ca(OH)2 + TAP at 1 mg/mL (p < 0.05). Conclusion Ca(OH)2, TAP, and their combination are not toxic to hDPSCs and the use of their combination was superior in hDPSCs viability on Ca(OH)2 + TAP in the 0.1 mg/mL group.

Interpretation by literature review of the use of calcium hydroxide as an intra-ductal medication

The effectiveness of calcium hydroxide as an antiseptic agent in endodontics has recently gained relevance, being crucial to ensure optimal results in endodontic treatments. The aim of the study was to interpret the use of calcium hydroxide as an intra-endodontic medication by means of a literature review. A narrative review of the updated literature was performed, with the aim of describing the effects of CaOH and exposing the different clinical procedures in which it is used, as well as the results of its application in endodontic therapy. Clinical trials, meta-analyses and original and published articles from 2018 to 2023, in English or Spanish, were included. It was found that calcium hydroxide plays a key role in endodontics due to its dissociation into calcium and hydroxyl ions, which contributes to its antimicrobial and biological efficacy. Its clinical application is extensive, including preventive endodontics, direct and indirect pulp capping, pulp curettage and pulpotomies, especially in teeth with incomplete apical development. The mechanism behind its antimicrobial action lies in the diffusion of calcium ions and the increase in pH, which limit the rate and enhance the antimicrobial effect in root canals. It was concluded that, for an effective endodontic treatment, it is necessary to eliminate all microorganisms from the root canal. In addition, the microorganism such as E. faecalis has a high resistance to endodontic treatment, which is due to its ability to penetrate into the dentinal tubules, tolerate high alkalinity, and form biofilms

Comparative assessment of nanosized intracanal medicaments on penetration and fracture resistance of root dentin - An in vitro study.

The antimicrobial potential of conventional medicaments is reduced due to their limited permeability. The use of calcium hydroxide (CH) is known to reduce the root strength. Nano intracanal medicaments have the following advantages over conventional such as higher surface area and chemical reactivity, and due to its nanosize, have better penetrability, supporting its possible use as an intracanal medicament. Nano versions of CH, chitosan (CS), CS + CH, curcumin (T), and its conventional forms are used in our study. The aim of this study was to evaluate and compare the depth of penetration of nanosized intracanal medicaments and their effect on fracture resistance of root dentin. Eighty extracted single-rooted teeth were used after decoronation. Canals were enlarged up to size 30 (0.04° taper) using Neoendo instruments (Orikam, India). Teeth were randomly assigned to two broad groups based on the type of intracanal medicament used; Group A: control (conventional) (n = 40) and Group B: nanosized intracanal medicaments (n = 40). Each group was subdivided into four experimental groups (n = 10), Group A1: CH, Group A2: CS, Group A3: curcumin (T), Group A4: CS + CH, Group B1: nano calcium hydroxide (NCH), Group B2: nano CS (NCS), Group B3: nano curcumin (NT), and Group B4: NCS + nano calcium hydroxide (NCS + NCH). All the specimens were stored in a humidor at 37°C for 4 weeks. Out of 10 specimens from each group, five specimens were used for evaluating the depth of penetration using a confocal laser scanning electron microscope, and the remaining five specimens were used for evaluating fracture resistance in a universal testing machine at the end of 4 weeks. Data were analyzed using one-way ANOVA and intergroup comparison using Tukey's post hoc multiple comparison test. The highest fracture resistance was seen with NCS and the maximum depth of penetration with nano calcium hydroxide (NCH). The fracture resistance and depth of penetration at a 4-week interval were higher in nano forms compared to their micro-sized counterparts with all groups. The coronal section presented the highest depth of penetration of intracanal medicaments followed by the middle and least in the apical section of root dentin with all groups.

Effect of T ect of Triple Antibiotic P riple Antibiotic Paste, Double Antibiotic P aste, Double Antibiotic Paste, and aste, and Calcium Hy Calcium Hydroxide on Antibiotic Resistance of T xide on Antibiotic Resistance of Tet Repr et Repressor Proteins, T oteins, Tetracycline Resistance Gene W cline Resistance Gene W, and T , and Tetracycline Resistance Gene Q: A Randomized

Objective: To investigate the effect of the use of Calcium Hydroxide (Ca(OH)2 ), Triple Antibiotic Paste (TAP), and Double Antibiotic Paste (DAP) as intra-canal medicaments on the development of antibiotic resistance by evaluating tetracycline genes. Methods: Forty five patients were randomly assigned into 3 groups according to the intracanal medication using a web program (www.randomizer.org), (Ca(OH)2 , TAP and DAP). Root canal bacteriological samples were collected before root canal treatment (S1) and after chemo-mechanical procedures (S2). Following root canal shaping procedures, intra-canal medication of the root canals was performed with selected intra-canal medicament. A second appointment was planned for the patients 15 days later. At the second appointment, the medication was removed mechanically and after irrigation of the root canals, the post medication samples (S3) were collected. Bacteriological samples were then investigated for bacterial counts and antibioticresistant genes [Tet Repressor proteins (TetR), Tetracycline resistance gene W (TetW) and Tetracycline resistance gene Q (TetQ)] using polymerase chain reaction (PCR), and the data were statistically analyzed. The Friedman, Kruskall-Wallis and chi-square tests were used. These genes were selected as the difference between TAP and DAP is that TAP contains tetracycline and tetracycline resistance is governed by tet genes. Results: There was no statistically significant difference among the samples (S1, S2, and S3) in terms of the number of root canals positive for antibiotic resistance genes in both the Ca(OH)2 and DAP groups. However, the number of root canals positive for TetR gene increased significantly (6 [40%] to 12 [86%]) following intra-canal medication with TAP. Conclusion: It can be concluded that 15 of days intra-canal medication with TAP causes tetracycline resistance. In contrast, DAP does not cause tetracycline resistance and it has similar antibacterial effectiveness to TAP. The DAP would be the choice of medicament rather than TAP in clinical practice.

Biocompatibility, Biomineralization and Induction of Collagen Maturation with the Use of Calcium Hydroxide and Iodoform Intracanal Dressing.

Biocompatibility and biomineralization of root canal dressings are important requirements for periapical healing. This study evaluated the inflammatory response, biomineralization and tissue repair by collagen fiber maturation in the subcutaneous tissue of rats. Eighteen Wistar rats (n = 6) received subcutaneous implants: calcium hydroxide + propylene glycol [CH+P], calcium hydroxide + propylene glycol + iodoform [CH+P+I], iodoform + carbowax [I+Cwax] and carbowax [Cwax]. Extra empty tubes were used as a control [C]. After 7, 15 and 30 days, the implants were removed with surrounding tissue for staining of hematoxylin-eosin, Von Kossa, picrosirius red and without staining for analysis under polarized light. Results were analyzed via Kruskal-Wallis followed by Dunn testing for nonparametric data and ANOVA followed by a Tukey post hoc test for parametric data (p < 5%). At 7 days, all groups showed a moderate inflammatory reaction and thick fibrous capsule, except the [Cwax] group, with a severe inflammatory infiltrate (p < 0.05). After 15 days, all groups but control had a decrease in inflammatory response. At 30 days, all groups presented a mild reaction and thin fibrous capsule (p > 0.05). Only groups containing calcium hydroxide were found to be positive using Von Kossa staining and polarized light in all periods. At 7 days, all groups showed a higher proportion of immature fibers. At 15 days, the [CH+P] and [Cwax] groups increased their proportion of mature/immature fibers. At 30 days, only the [CH+P] group presented a significant prevalence of mature collagen fibers (p < 0.05). All groups showed biocompatibility, but only groups containing calcium hydroxide induced biomineralization. The addition of iodoform delayed tissue healing.

ANTIBACTERIAL ACTIVITY TEST OF CALCIUM HYDROXIDE AND MAULI BANANA (Musa acuminata) STEM EXTRACT GEL MIXTURE AGAINST Enterococcus faecalis

Background: The use of calcium hydroxide as an intracanal medicament has several weaknesses that can cause side effects, including chronic inflammation in the periapical tissue and resistance to several bacteria, one of which is Enterococcus faecalis. The bacteria are the most resistant microorganism to calcium hydroxide due to a high pH tolerance capability. This weakness is the reason for finding alternative materials that can combine with calcium hydroxide. Mauli banana stem has bioactive compounds such as tannins, saponins, alkaloids, and flavonoids which have antibacterial and anti-inflammatory effects. Therefore, combined with calcium hydroxide may exhibit good characteristics as an intracanal medicament. Purpose: To analyze the antibacterial activity of the calcium hydroxide and mauli banana (Musa acuminata) stem extract gel mixture against Enterococcus faecalis. Methods: The research is a pure experimental study with a post-test only with control group design that uses 4 treatment groups, including calcium hydroxide and mauli banana stem extract gel mixture at a concentration of 25%; 37,5%; 50%; and control with each of 9 replications. The parameter measured was the diameter of the inhibition zone that formed on Mueller Hinton Agar. Result: One Way Anova and Bonferroni Post Hoc tests showed significant differences between each treatment group. Conclusion: The mixture of calcium hydroxide and mauli banana stem extract gel had antibacterial activity against Enterococcus faecalis. The mixture of calcium hydroxide and mauli banana stem extract gel at 50% concentration obtained the highest inhibition zone. Keywords: Antibacterial activity, Calcium hydroxide, Enterococcus faecalis, Musa acuminata

Recovery of antimony and bismuth from arsenic-containing waste streams from the copper electrorefining circuit: An example of promoting critical metals circularity from secondary resources

The copper pyrometallurgical industry faces the precipitation of un-soluble slimes containing bismuth, arsenic and antimony that can reduce copper purity. Ion-exchange resins are used to treat the electrolyte to avoid their precipitation. After resin saturation, a regeneration stage with 17%(w/w) hydrochloric acid containing antimony and bismuth (e.g. up to 10 g/L) is currently limed. In this work, a selective precipitation process was developed to recover both elements as pure as possible from the eluate, considering that also high contents of As(V) are present. Results showed that during the precipitation process, As(V) forms insoluble antimony-arsenates. Therefore, the eluate was pre-treated to reduce As(V) and Sb(V) using SO2(g) or NaHSO3(s). In this case, it was possible to obtain sequentially antimony oxychloride (Sb4O5Cl2, purity> 93%) and bismuth oxychloride (BiOCl, purity> 95%) under appropriate pH control using sodium hydroxide, sodium bicarbonate and/or sodium carbonate. The use of calcium hydroxide and calcium carbonate resulted in the precipitation of calcium sulphates (CaSO4:H2O(s) and CaSO4:2H2O(s)), which reduced the by-products purity.

SURGICAL REMOVAL OF SUPERNUMERARY TOOTH FOLLOWED BY ORTHODONTIC TRACTION OF PERMANENT CENTRAL INCISOR BY FIXED APPLIANCE THERAPY

Management of immature root with a necrotic pulp and apical periodontitis is a challenging task. Obturation of the root canal is difficult because of lack of apical barrier for containing the root filling material. Treatment of choice in such cases is the apexification procedure, i.e., establishing an apical barrier. Calcium hydroxide has been widely used for the induction of hard tissue barrier. However, this material requires 5-20 months to form the hard tissue barrier. It has also been shown that the use of calcium hydroxide weakens the resistance of the dentin to fracture. In recent times, mineral trioxide aggregate (MTA) has gained widespread popularity for the apexification procedure. It produces apical hard tissue formation with significantly greater consistency than calcium hydroxide.MTA, a biocompatible material, can be used to create a physical barrier. It also helps in the formation of bone and periodontium around its interface.

Endodontic management of open apex in a tooth using platelet rich plasma mediated regeneration: Case report

Endodontic management of open apex includes conventional treatment method using calcium hydroxide for apexification or use of mineral trioxide aggregate plug. Use of calcium hydroxide for long time causes weakening of dentinal structure which may lead tooth to fracture in later stage. Mineral trioxide aggregate is advantageous as compared to increased number of appointments with calcium hydroxide. Recently, modified concept of regeneration has been suggested as the treatment plan of open apex tooth. Effective disinfection of root canal is of utmost importance for the regeneration of pulp dentin complex. This article presents a case report with endodontic regeneration using platelet rich fibrin for revitalization of immature non vital tooth.

Isomerization of Galactose to Tagatose: Recent Advances in Non-enzymatic Isomerization.

The valorization of galactose derived from acid whey to low-calorie tagatose has gained increasing attention. Enzymatic isomerization is of great interest but faces several challenges, such as poor thermal stability of enzymes and a long processing time. In this work, non-enzymatic (supercritical fluids, triethylamine, arginine, boronate affinity, hydrotalcite, Sn-β zeolite, and calcium hydroxide) pathways for galactose to tagatose isomerization were critically discussed. Unfortunately, most of these chemicals showed poor tagatose yields (<30%), except for calcium hydroxide (>70%). The latter is able to form a tagatose-calcium hydroxide-water complex, which stimulates the equilibrium toward tagatose and prevents sugar degradation. Nevertheless, the excessive use of calcium hydroxide may pose challenges in terms of economic and environmental feasibility. Moreover, the proposed mechanisms for the base (enediol intermediate) and Lewis acid (hydride shift between C-2 and C-1) catalysis of galactose were elucidated. Overall, it is crucial to explore novel and effective catalysts as well as integrated systems for isomerizing of galactose to tagatose.

Non-surgical Management of a Large Periapical Lesion: A Case Report

Periapical lesions develop as a sequela to pulpal diseases. The majority of inflammatory periapical lesions are initially treated with conservative non-surgical procedures. The success of root canal treatment is based on thorough cleaning, shaping and obturation of the root canal system. Calcium hydroxide and triple antibiotic paste (TAP) are recommended as intracanal medicaments due to its antibacterial properties. This case report describes the non-surgical management of a large cyst-like periapical lesion in relation to the maxillary lateral incisor of a 19-year-old male with the chief complaint of periodic swelling and pus drainage from the palatine region with a history of a traumatic accident in the same area. The present case highlights the use of calcium hydroxide and TAP as an interappointment endodontic dressing for non-surgical management of large periapical radiolucency, which resulted in favourable clinical and radiographic outcomes.

Сравнительная клиническая эффективность кальций-силикатных цементов и кальция гидроксида в витальной терапии пульпы постоянных зубов

BACKGROUND: Preservation of pulp viability allows to preserve the integrity of tooth structures, the correct relationship with other elements of the dental system, therefore, the improvement of materials aimed at preventing endodontic treatment with preservation of the entire pulp is of great clinical importance. AIM: Comparison of clinical effectiveness of various materials in the vital therapy of permanent tooth pulp. MATERIALS AND METHODS: The study involved 30 patients (20 male and 10 female patients aged 11 to 25 years) divided into 3 groups. Vital pulp therapy of permanent molars and premolars with formed and unformed roots diagnosed as reversible pulpitis was carried out by direct and indirect coating with calcium hydroxide in group 1 (9 patients/18 teeth) (Calasept, with Dycal-isolated surface), with ProRootMTA in group 2 (10 patients/15 teeth) and with Biodentine in group 3 (11 patients/15 teeth). IRM (methyl methacrylate-reinforced zink-oxide-eugenol cement) was used as temporary filling. The research data were processed using nonparametric statistics. RESULTS: After 4 years of follow-up: After the first stage of observation, not in a single of 14 remaining teeth in group 1 (4 teeth were subjected to endodontic treatment), clinical and radiological signs of pulp pathology were found; in 3 teeth (21.4%), pronounced narrowing of the pulp chamber and obliteration of the pulp of canal orifice were noted, which did not require endodontic intervention. In group 2, of 13 teeth (2 teeth previously received endodontic treatment), 1 tooth (7.6%) was diagnosed with irreversible symptomatic pulpitis and 2 teeth (16.6%) — with pronounced narrowing of the pulp chamber, obliteration of the root pulp, 3 teeth (25%) — with denticles in the pulp chamber. In group 3, 2 teeth (13.3% of cases) were subjected to endodontic treatment for irreversible symptomatic pulpitis in 1.5 year after the beginning of the observation, and in 1 tooth (6.6%), the formation of multiple denticles in the pulp chamber was noted. CONCLUSION: Thus, the clinical and radiological effectiveness of use of calcium hydroxide in vital pulp therapy of permanent teeth after 12 months was 77.7% (14 of 18 teeth), of ProRootMTA — 86.6% (13 of 15 teeth) and of Biodentine — 100%, which absolutely correlates with the data of modern literature sources. In direct pulp coating (pulpcap) in permanent teeth, 100% excellent treatment results within 1 year were achieved only with Biodentine.

Role of calcium hydroxide in the alkaline activation of coal fly ash

Aiming at reducing the environmental effects generated by the manufacturing of Portland cement, the construction sector perceives significant potential in alkali-activated cements. The use of calcium hydroxide becomes an alternative to modify the properties of these types of cements in a controlled manner. This research work examines the influence of calcium hydroxide at different concentrations on the alkaline activation of a coal fly ash with sodium hydroxide. The cements pastes were evaluated according to their compressive strength at 3 and 28 days, and once the curing process had finished at the initial conditions (3 days, >95% RH at 45 °C), they were characterized using the XRD, FTIR, TG, MAS NMR and BSEM/EDX techniques. The presence of calcium hydroxide increased the compressive strength of the pastes at 28 days from 4.5 MPa to 25.65 MPa. Likewise, the maximum resistance growth rate was 41.03 %. The highest percentages of calcium hydroxide fixation were 74.82%, which modified the type and quantity of cementing gels. The calcium hydroxide forms a layer on the fly ash particles and these, when in contact with the activator, produce absorption and desorption processes of network modifying elements (Na and Ca) and network formers (Al and Si). Finally, the confluence of the chemical constituents (Na, Ca, Al and Si) initiates the formation of cementing gels type C−(A)−S–H and (N,C)−A−S–H.

Causes of Discoloration of Dental Fillings in Adults: A Systematic Review

The purpose of this investigation was to carry out an exhaustive review of the relevant previous research in order to ascertain the underlying causes of the observed discoloration and determine which component, if any, was to blame. A number of phrases taken from previously conducted systematic reviews were used in the search conducted in PubMed. There were a total of 389 teeth treated across eleven different trials that were discovered. Although it was seen more often with the use of the triple antibiotic paste that included minocycline, discoloration was shown to be substantially associated with the utilisation of other components as well. It is strongly suggested that you reevaluate your decision to use minocycline as the intracanal drug in conjunction with the other two antibiotics in the paste. The use of calcium hydroxide or an antibiotic paste containing both metronidazole and ciprofloxacin could be necessary in order to achieve the desired level of discoloration control. The presence of mineral trioxide aggregate was also associated with the discoloration. On the other hand, there is little evidence to suggest that any other material could possibly function as an acceptable coronal barrier. Because discoloration is a result that has a direct impact on patients, further research is required to determine the underlying causes of discoloration.

Assessing the Contact Angle Between Dentin Treated With Irrigation and Calcium Hydroxide and Root Canal Sealers.

BackgroundThe long-term use of calcium hydroxide, or Ca(OH)2, on dentin has been established in the literature. However, scarce data is available on dentin wettability with Ca(OH)2.AimThe present study was conducted to assess the outcomes of Ca(OH)2 use on the wettability of dentin following two and four weeks of using sealers of bioceramic (BC) and Tubli-Seal™ in the root canal.MethodsIn this study, 168 specimens were divided into 12 groups of 14 specimens each and were numbered from G1 to G12. G1-G6 groups were tested with Tubli-Seal. Sterile water irrigation was reserved for G1 for two weeks (14 days) followed by two minutes treatment with 6% sodium hypochlorite (NaOCl) chemical irrigation and 17% EDTA (10 ml). G2 and G3 were subjected to Ca(OH)2 (0.1 ml of UltraCal) for two weeks followed by 10ml sterile water irrigation for two minutes with chemical irrigation. G4 to G6 were given similar treatment for four weeks. G7-G12 were assessed for BC sealer similarly to G1-G6. Two and four weeks of incubation with sterile water or Ca(OH)2 was done in 100% humidity at 37°C. SEM and EDX were done to evaluate the surface morphology of G1 and G6, and results were formed. ResultsSignificantly smaller contact angles were seen for Tubli-Seal (G1 to G6) compared to BC (G7 to G12) with p<0.05. Application of water irrigants and Ca(OH)2 (in G2, G5, and G11) showed a smaller (p<0.05, statistically significant) contact angle compared to the use of chemical irrigation agents and Ca(OH)2 (in G3, G6, and G12) except for G8 and G9. Based on EDX and SEM, compared to the use of chemical irrigation with Ca(OH)2, higher remnants of Ca(OH)2 were seen in the water irrigation, whereas, no remnant was seen with chemical irrigants. ConclusionBetter dentin wettability is seen with Tubli-seal compared to BC sealer. A smaller contact angle between root canal sealers and dentin is seen in the remaining calcium hydroxide samples. Also, calcium hydroxide can be removed from the polished dentin surface with two minutes of irrigation with 17% EDTA and 6% NaOCl.

EFFECT OF KARAMUNTING LEAF EXTRACT (Melastoma malabathricum) ON THE PROLIFERATION OF BABY HAMSTER KIDNEY-21 (BHK-21) FIBROBLAST CELLS

Background: Pulpitis is an inflammation of dental pulp due to infection of microorganisms from dental caries. Pulpitis is clinically divided into reversible and irreversible pulpitis. Treatment of reversible pulpitis can be done by applying a pulp capping material. The use of calcium hydroxide as a pulp capping material is still not optimal, so an alternative material is needed, namely karamunting leaf (Melastoma malabathricum). The secondary metabolites in karamunting leaf extract have antibacterial activity. Antibacterial activity is needed in the regeneration of pulp tissue. Purpose: To analyze the effect of karamunting leaf extract (Melastoma malabathricum) on viability and proliferation of Baby Hamster Kidney-21 (BHK-21) fibroblast cells using the MTT Assay method. Methods: This study is a purely experimental study with post test only with control group design which were divided into 8 groups. The group was treated with karamunting leaf extract consisted of 5 groups, were 5%, 10%, 15%, 20%, and 25% concentrations also 3 control groups, were positive control (calcium hydroxide), cell control, and media control. Absorbance value was read using ELISA Reader and the percentage of cell viability was calculated. Results: All treatment groups had cell viability values higher than cell control and cause proliferation of BHK-21 fibroblast cells. The One Way Anova showed a value of sig=0,000 (p&lt;0,05), which means that there was a minimum difference in one treatment group. Conclusion: Karamunting leaf extract and calcium hydroxide can maintain viability and cause proliferation of BHK-21 fibroblast cells. Karamunting leaf extract 25% concentration more effective in causing proliferation of BHK-21 fibroblast cells.

Isolation of Endogenous TGF-β1 from Root Canals for Pulp Tissue Engineering: A Translational Study.

Simple SummaryTissue engineering of the dental pulp has been a goal of dental research for years. In this translational study, a chairside protocol is designed using endogenous dentin matrix proteins as signaling molecules for pulp regeneration. These bioactive molecules can be isolated from root canals by ultrasonic-activated irrigation, further processed chairside, and mixed with a hydrogel. The scaffold material is to be injected into the root canal and effect cell homing, i.e., allowing stem cells from the periapical space to migrate into the root canal. The aim of this innovative approach is the formation of an innervated and vascularized connective tissue that resembles the pulp in form and function.Cell homing for dental pulp tissue engineering has been advocated as a feasible approach to regenerate dental pulp in a clinical setting. In order to develop a translational protocol for clinical application, we wanted to determine the effects of disinfectants on the availability of growth factors from the root canal, the amount that can be obtained in this context, and whether they can be processed for use in tissue engineering procedures. The extraction of growth factors should also be confirmed in a clinical setting. Root canals were prepared in 36 extracted mature teeth, and the amount of TGF-β1 in solution was quantified after different irrigation protocols (sodium hypochlorite, chlorhexidine) and after intracanal medication (calcium hydroxide). Centrifugal filters with a cut-off of 10,000 Da and 3000 Da were used for efficient concentration, and volumes and amounts of retained TGF-β1 were measured at different time points. During conventional endodontic treatment, ethylenediaminotetraacetic acid (EDTA) solution was collected after ultrasonic activation from the root canals of mature teeth of 38 patients, and growth factor content was quantified via enzyme-linked immunosorbent assay (ELISA). Irrigation with sodium hypochlorite reduced TGF-β1 release into EDTA. This effect was partially reversed by canal enlargement after the use of sodium hypochlorite and by subsequent use of calcium hydroxide. A few minutes of centrifugation with a cut-off of 10,000 Da reduced the initial volume of the irrigant by 90% and led to a continuous increase in concentration to the same extent. Furthermore, TGF-β1 was obtained from root canals of mature teeth during endodontic treatment in quantities that have been shown to elicit desirable cellular responses in a subsequent clinical application. A mixture with a suitable scaffold material and injection into the root canal has the potential to promote dental pulp regeneration.

Farm use of calcium hydroxide as an effective barrier against pathogens

Livestock farming is affected by the occurrence of infectious diseases, but outbreaks can be prevented by proper sanitary control measures. Calcium hydroxide (Ca(OH)2), commonly called slaked lime, powder is traditionally used as a disinfectant to prevent infectious diseases in livestock. Since Ca(OH)2 can inactivate a wide variety of pathogens, has a small environmental impact, does not require a disinfection tank (i.e., can be spread directly on the ground) and is produced inexpensively worldwide, it is used for the prevention of epidemics on farms worldwide. Water is essential for the strong alkalinity that underlies its disinfecting effect, but it is unknown how much water is required under field conditions. In addition, Ca(OH)2 reacts with carbon dioxide in the environment, reducing its pH, but it is unclear how long its degradation takes under actual field use. Thus, we measured the water adsorption ability of Ca(OH)2-based disinfectants and its relation to disinfectant activity, as assessed by colony counts and live/dead staining and observation. We found that 15–20% (w/w) water in Ca(OH)2 was necessary for disinfection to occur in practice. Moreover, we found that the pH of Ca(OH)2 decreased within about two weeks to one month under actual use in practical conditions and lost its ability to disinfect. We further showed that granules prepared from Ca(OH)2 and zeolite maintained high alkalinity more than twice as long as calcium powder. These findings will help to establish a suitable method of applying Ca(OH)2 to protect farms from infectious diseases.

Method for Calculating the Durability of Bricklaying Materials Based on Chemical Corrosion Processes

Estimation of the durability of building ceramics is an important applied task. Especially difficult is an analysis of multi-layer building enclosures because of potential interactions of their component parts. Durability of building ceramics is in need of additional research. In this article, the method of evaluation of chemical resistance of a ceramic brick is reviewed. The research was conducted to determine the error of the method with the use of sodium hydroxide as a destructive agent. The results have shown a minor standard deviation of 2.74% with a confidence interval of 3.11%. The comparative analysis of alkalis activity interacting with ceramic materials was conducted: an experiment with sodium hydroxide and potassium hydroxide were made and chemical degradation coefficients are included. The results has demonstrated different degree of alkali effect in the same experiment conditions that confirmed thermodynamic calculation of chemical reaction’s trends. The methods of corrosion research of building ceramics with use of calcium hydroxide and magnesium hydroxide were reviewed and completed and mass-spectrometric analysis of these solutions were conducted. Conducted analysis and completion of the research methods that evaluate degradation of building ceramics creating a vector for the following researches with a goal to create a broader picture of corrosion process of building materials.