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Journal articles on the topic ''-methylenedianiline Dental material Urea'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hideharu, Shintani. "Toxic Compounds Analysis by High Performance Liquid Chromatography." International Journal of Clinical Pharmacology & Toxicology 3, no. 1e (2014): 1–2. https://doi.org/10.19070/2167-910X-140005e.

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I have studied the characteristics of toxic compounds from the sterilized medical devices or dental material, which migrated into patient’s body fluid and evaluated if the migrated amount is risky or not. I have studied several sorts of toxic compounds. They are 4,4’-methylenedianiline (MDA), bisphenol A, phthalate esters, methylmethacrylate (MMA), N,N’-dimethyl p-toluidine (DMPT), benzoly peroxide (BPO), 4,4’-dihydroxydiphenyl sulfone, 4-hydroxy 4’-chloro diphenyl sulfone and so on. Mostly they are from medical devices and denta

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2

Then, Sonja, Gan Seng Neon, and Noor Hayaty Abu Kasim. "Performance of melamine modified urea-formaldehyde microcapsules in a dental host material." Journal of Applied Polymer Science 122, no. 4 (2011): 2557–62. http://dx.doi.org/10.1002/app.34361.

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3

Yanishen, I. V., O. V. Sidorova, R. V. Kuznetsov, N. V. Krychka, and I. L. Diudina. "BIOCHEMICAL PARAMETERS OF BLOOD OF LABORATORY ANIMALS IN CASE OF PROLONGED CONTACT WITH THE RESEARCH MATERIAL." Актуальні проблеми сучасної медицини: Вісник Української медичної стоматологічної академії 24, no. 1 (2024): 164–67. http://dx.doi.org/10.31718/2077-1096.24.1.163.

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The purpose of this study was to determine the biochemical parameters of blood of laboratory animals in prolonged contact with the experimental material Materials and methods. An experimental study was conducted in the laboratories and vivarium of the State Institution "Institute of Spine and Joint Pathology named after Prof. M.I. Sitenko" on 28 white laboratory rats aged 6 months with a body weight of 200 to 250 grams. The animals were randomly divided into two groups: a control group (14 rats) and an experimental group (14 rats), which were exposed to dental glass ionomer cement at a d

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4

Isnaini, Steella Ilham, Twi Agnita Cevanti, Nur Shiyama Purnama Sari, Mahardika F. Rois, W. Widiyastuti, and Heru Setyawan. "Effect of Cellulose Fiber from Coconut Coir as Filler For Dental Flowable Composite." Journal of Physics: Conference Series 2344, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1742-6596/2344/1/012019.

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Abstract The composite restorations in posterior teeth have recently received an increasing interest due to the improvement of their physical and mechanical properties. However, compositing by the most common polymerization procedure tends to deform the tooth structure that may cause some damage in the marginal seal due to the imperfect interfacial attachment. Several techniques have been used to overcome this problem, one of them is using a flowable composites on the bottom of the cavity as the first layer. The purpose of this study is to develop fiber-reinforced composite (FRC) material made

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5

Hassan, Haidar, Peter Lingström, and Anette Carlén. "Plaque pH in Caries-Free and Caries-Active Young Individuals before and after Frequent Rinses with Sucrose and Urea Solution." Caries Research 49, no. 1 (2014): 18–25. http://dx.doi.org/10.1159/000360798.

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Objective: To examine pH in the approximal dental biofilm after acid and alkali formation from sucrose and urea, after an adaptation period to these substances, in caries-free (CF) and caries-active (CA) individuals. Saliva flow and buffer capacity, and aciduric bacteria in saliva and plaque were also examined. Material and Methods: Twenty adolescents and young adults (15-21 years) with no caries (n = 10, Dm + iMFS = 0) or ≥1 new manifest lesions/year (n = 10, DmMFS = 3.4 ± 1.8) participated. After plaque sampling, interproximal plaque pH was measured using the strip method before (baseline) a

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6

Anaila Baroni, Juliana Marchioro Souza, Maria Fernanda Torres, Paulo Henrique Tomazinho, and João Armando Brancher. "Utilization of a biochemical kit for detection of C-reactive protein (CRP) in the saliva of periodontal disease individuals." RSBO 8, no. 3 (2012): 282–6. http://dx.doi.org/10.21726/rsbo.v8i3.1072.

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Introduction: Periodontal disease (PD) is a chronic inflammatory process that occurs in response to infection from bacteria in dental plaque. PD affects and destroys the periodontal tissues causing teeth loss. It is also associated to systemic diseases. C-reactive protein (CRP) is a protein produced by the liver and released into the blood during the acute phase of inflammation. Therefore, CRP is very used as a marker for inflammation process. Studies on the presence of CRP in the saliva of the subjects with PD do not exist. Objective:The aim of this study was to test a biochemical kit for CRP

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7

Saowapark, Thanunya, Ukrit Amphaiphan, Ekrachan Chaichana, and Panjaporn Wongwitthayakool. "Enhancing Properties of Deproteinized Natural Rubber with Rice Husk Ash Silica for Use as a Dental Material." Key Engineering Materials 675-676 (January 2016): 564–68. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.564.

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Rice husk is an agricultural residue from a rice-mill known as a rich source of silica. In this study, the rice husk was extracted for the contained silica by pretreatment with hydrochloric and calcination at 700 °C, and the white rice husk ash (WRA) mainly consisting of the silica was finally obtained. WRA was then investigated for its composition and structure with X-ray fluorescence (XRF) and X-ray diffractometer (XRD). The results showed that WRA contained a large amount of silica (90%) with amorphous structure. After that, WRA was used as filler for the preparation of natural rubber produ

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8

Seleem, Dalia, Shaahin Dadjoo, Ambrose Ha, et al. "Effect of 10% Carbamide Peroxide on Tooth Shade, Plaque Index and Gingival Index during Invisalign Treatment." Dentistry Journal 9, no. 5 (2021): 48. http://dx.doi.org/10.3390/dj9050048.

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Invisalign has improved periodontal health in comparison to traditional metal wire braces. Due to a growing interest in attaining better teeth esthetics, there are more adults seeking Invisalign treatment. Ten percent carbamide peroxide (CP) breaks down to 6.5% urea and 3.5% hydrogen peroxide, which elevates oral pH, removes stains, and diminishes caries by inhibiting plaque formation. The aim of this study is to investigate whether 10% CP use during Invisalign treatment can enhance tooth shade esthetics while decreasing plaque levels and improving gingival health indices. Twenty-eight patient

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9

Książek, Katarzyna, Joanna Żołnierz, and Jarosław Jerzy Sak. "Approximal Plaque Index, parameters of calcium-phosphate and iron metabolism and the quality of life of hemodialysis patients." Polish Journal of Public Health 126, no. 4 (2016): 179–83. http://dx.doi.org/10.1515/pjph-2016-0037.

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Abstract Introduction. Hemodialysis patients require high standards in the field of dental diseases prevention and also in pharmacological and dialysis methods of combating biochemical disorders. It is necessary to question the methods of monitoring oral hygiene quality among hemodialysis patients. Aim. The aim of this study was to determine the relationship between Approximal Plaque Index (API) and the quality of life and biochemical parameters of the calcium, phosphate and iron metabolism. Material and methods. The study was conducted on a group of 124 individuals – 65 women (52%) and 59 men

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10

Gheorghe, Georgiana Florentina, Laura Iosif, Oana Elena Amza, et al. "SALIVARY FUNCTION AND BIOMARKER PROFILES IN RELATION TO ORAL HEALTH IN PATIENTS WITH PRE-DIALYSIS CHRONIC KIDNEY DISEASE." Romanian Journal of Oral Rehabilitation 16, no. 4 (2024): 54–73. https://doi.org/10.62610/rjor.2024.4.16.6.

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Aim of the study: With chronic kidney disease (CKD) projected to be the fifth leading cause of death by 2040, this study investigates oral health and the relationship between salivary and renal function in pre-dialysis CKD patients. Material and methods: A cross-sectional survey of 51 pre-dialysis patients at a nephrology center in Bucharest collected socio-demographic data and assessed salivary function, oral health, and renal function. Measurements included saliva quality, pH, buffering capacity, calcium, phosphate, IL-6, TNF-α, and albumin, while oral health was evaluated using the DMFT ind

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11

Memon, Sikander, and Feroze Kalhoro. "Efficacy of Carbamide Peroxide and Sodium Perborate as Bleaching Agent in Non-Vital Discolored Teeth." ENVIRO Dental Journal 2, no. 1 (2021): 29–34. http://dx.doi.org/10.12944/edj.02.01.06.

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To estimate the effectiveness of sodium perborate with carbamide-peroxide (urea peroxide) to remove the staining of non-vital discolored teeth. Comparative cross sectional study. Dental department of operative dentistry, LUMHS, Jamshoro Sindh, Pakistan, from December 15-12-2014 to June 15-6-2015. A total of 160 single rooted teeth with intact clinical crowns have been collected. Using human blood, the teeth were discolored. With the vita shade guide, shades of discolored teeth were taken. Each tooth was handled with the root canal. 2 mm of root-canal-filling material cleaned under the junction

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12

Sydorenko, O. O., S. V. Pavlov, and O. V. Voznyi. "THE USE OF MOLECULAR AND BIOCHEMICAL MARKERS OF BONE METABOLISM FOR SCREENING OF DENTAL HEALTH OF THE POPULATION." Ukrainian Dental Almanac, no. 2 (June 26, 2020): 24–28. http://dx.doi.org/10.31718/2409-0255.2.2020.03.

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At present, the research interests of both dentists and clinical laboratory diagnosticians lie in the field of using oral fluid as an object of diagnostic estimation of molecular and biochemical markers in oral cavity diseases. It is commonly known that oral fluid has both organic and non-organic components. Non-organic components of saliva are represented by macro- and microelements that can be parts of various compounds or stay in the ionized form. Organic components are represented by proteins, carbohydrates, lipids, essential nitrogenous compounds (urea and uric acid), vitamins, hormones,

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13

Hideharu, Shintani. "Pretreatment, Analysis, Identification and Preparation of Toxic Compounds Eluted into Body Fluids from Medical and Dental Devices." October 1, 2014. https://doi.org/10.19070/2470-4490-140001.

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Selective analysis of toxic compounds in complicated matrix such as body fluids is extremely difficult. This is because unexpected interference admixtures with almost identical retention time in chromatography may co-elute with overlapping. 1t is essential to remove admixtures byappropriate pretreatment procedures. For that purpose there may be several sorts of pretreatment methods such as liquid-liquid extraction or solid phase extraction (SPE) using column, membrane dialysis filtration ultra-filtration super fluid critical extraction SFE or adsorption using charcoal or other appropriate adso

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14

Then, S., G.S. Neon, and Kasim N.H. Abu. "Performance of melamine modified urea-formaldehyde microcapsules in a dental host material." WILEY-BLACKWELL, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA, November 1, 2011. https://doi.org/10.5281/zenodo.811311.

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Urea-formaldehyde (UF) microcapsules filled with dicyclopentadiene (DCPD) show potential for making self-healing dental restorative materials. To enhance the physical properties of the capsules, the urea was partially replaced with 0-5% melamine. The microcapsules were analyzed by different microscopic techniques. DSC was used to examine the capsule shell, and the core content was confirmed by (1)H NMR spectroscopy. Capsules in the range of 50-300 mu m were then embedded in a dental composite matrix consisting of bisphenol-A-glycidyl dimethacrylate (Bis-GMA) and triethylene-glycol dimethacryla

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15

Fadel, Victoria Sanches, Paula Roberta Perondi Furtado, and Marcia Margarete Meier. "Benzoyl peroxide encapsulation in poly(urea‐formaldehyde) microcapsules for use in dental materials." Polymer Engineering & Science, June 17, 2024. http://dx.doi.org/10.1002/pen.26831.

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AbstractNew self‐healing resin composites with tertiary amine microcapsules enhance the mechanical performance of dental restorations. However, a higher concentration of dibenzoyl peroxide (BPO) must be added to the composite to react with the core material when the microcapsules rupture, reducing the shelf life of dental materials due to their reactivity. As a result, one approach to reducing the amount of BPO dissolved in dental resin is to microencapsulate it. Thus, this manuscript described the encapsulation of BPO in poly(urea‐formaldehyde) (PUF) microcapsules (MC) and investigated its ef

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16

Then, S., G. S. Neon, and Kasim N.H. Abu. "Optimization of microencapsulation process for self-healing polymeric material." January 1, 2011. https://doi.org/10.5281/zenodo.811347.

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A series of poly(urea-formaldehyde) (PUF) microcapsules filled with dicyclopentadiene (DCPD) was successfully prepared by in situ polymerization. The effect of diverse process parameters and ingredients on the morphology of the microcapsules was observed by SEM, optical microscopy (OM) and digital microscopy. Different techniques for the characterization of the chemical structure and the core content were considered such as FT-IR and (1)H-NMR as well as the characterization of thermal properties by DSC. High yields of free flowing powder of spherical microcapsules were produced. The synthesize

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