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Calcium Hydroxide

Mark Stenhouse, Peter Zilm, Jithendra Ratnayake, Peter Cathro
BACKGROUND: Calcium hydroxide is a common endodontic medicament and has an anti-microbial effect by increasing the localized pH within the root canal. However, Enterococcus faecalis has shown some resistance to calcium hydroxide. METHOD: A flow cell apparatus was used to grow an E. faecalis biofilm on dentine discs. Following 4 weeks growth in Todd Hewitt Broth, flow cells were exposed to either a rapid or slow increase to pH 11.5 or 12.5. Cellular viability was determined using serial plating and the number of colony forming units was normalised against the cellular protein content...
January 11, 2018: Australian Dental Journal
Jorgiana Sangalli, Elerson Gaetti Jardim Júnior, Carlos Roberto Emerenciano Bueno, Rogério Castilho Jacinto, Gustavo Sivieri-Araújo, João Eduardo Gomes Filho, Luciano Tavares Ângelo Cintra, Eloi Dezan Junior
OBJECTIVE: Evaluate, in vitro, the antimicrobial activity of Psidium cattleianum leaf extracts combined with calcium hydroxide against Enterococcus faecalis and Candida albicans biofilm. MATERIALS AND METHODS: Dentin specimens obtained from extracted bovine incisors were infected during 14 days with E. faecalis ATCC 29212 and C. albicans ATCC 10231. The specimens were filled with calcium hydroxide pastes prepared with the following vehicles: Psidium cattleianum ethanolic, Psidium cattleianum propylene glycolic, distilled water, and saline as control...
January 9, 2018: Clinical Oral Investigations
Giselle Nevares, Gabriela Queiroz de Melo Monteiro, Ana Paula Veras Sobral, Sergio Lemos de Campello, Marcely Cristiny Figueredo Cassimiro da Silva, Aldo Bezerra, Felipe Xavier Bezerra da Silva, Cristina Musso Scheneider, Diana Santana Albuquerque
BACKGROUND AND OVERVIEW: Although calcium hydroxide (Ca[OH]2) paste associated with barium sulfate (BaSO4) is considered a safe agent, there is a lack of clinical research on its effects on periodontal and submucosal tissues. The aim of the authors was to report the effects of extrusion of Ultracal XS paste (Ultradent Products) in 2 cases. The authors also analyzed the paste constituents and compared them with the proportion reported by the manufacturer and the material extruded. CASE DESCRIPTION: The authors present 2 cases in which root canals were restored with Ultracal XS paste after cleaning and shaping, and there was unintentional overextension of the paste into periradicular tissues, with a hardened exogenous material observed associated with inflammatory signs and symptoms...
January 2018: Journal of the American Dental Association
Federica Fonzar, Leopoldo Forner, Riccardo Fabian-Fonzar, Carmen Llena
Apexification is an endodontic technique used in immature necrotic teeth, the primary goal of which is to induce a calcified barrier in roots with open apices and to promote the continuation of apical root development. A 7-year-old patient with a coronal fracture in a maxillary central incisor was treated with an apexification technique using calcium hydroxide. The apical closure was obtained after one year, then a permanent root canal filling was performed. The tooth was monitored for a period of 20 years, up to when a trauma caused its extraction...
January 1, 2018: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
F B Basturk, Mohammad Hossein Nekoofar, M Gunday, P M H Dummer
OBJECTIVES: The aim of this study was to evaluate the effect of various mixing techniques as well as the effect of ultrasonic placement on hydration of mineral trioxide aggregate (MTA) using X-ray diffraction (XRD) analysis. MATERIALS AND METHODS: One gram of ProRoot MTA and MTA Angelus powder was mixed with a 0.34-g of distilled water. Specimens were mixed either by mechanical mixing of capsules for 30 s at 4500 rpm or by manual mixing followed by application of a compaction pressure of 3...
December 29, 2017: Clinical Oral Investigations
Shengdan Wang, Lingjun Kong, Jianyou Long, Minhua Su, Zenghui Diao, Xiangyang Chang, Diyun Chen, Gang Song, Kaimin Shih
Discharging phosphorus (P)-contaminated water directly into the aquatic environment leads to resource loss and eutrophication. Thus, removing P from waste streams is imperative. In this study, calcium-decorated biochar (Ca-BC) in different mass ratios of Ca to BC was designed to effectively adsorb P from solution. Ca-BC was characterized through X-ray diffraction (XRD) analysis, followed by isotherm and kinetic adsorption experiments. The decorated Ca on the BC surface was found to have preferred P adsorption ability...
December 26, 2017: Chemosphere
J V Karunakaran, Chris Susan Abraham, A Kaneesh Karthik, N Jayaprakash
Periapical lesions of endodontic origin are common pathological conditions affecting periradicular tissues. Microbial infection of pulpal tissues is primarily responsible for initiation and progression of apical periodontitis. The primary objective of endodontic therapy should be to restore involved teeth to a state of normalcy nonsurgically. Different nonsurgical management techniques, namely, conservative root canal therapy, decompression technique, method using calcium hydroxide, aspiration-irrigation technique, lesion sterilization and tissue repair therapy, active nonsurgical decompression technique, and the apexum procedure have been advocated...
November 2017: Journal of Pharmacy & Bioallied Sciences
Camila Paiva Perin, Vula Papalexiou, Aline Cristina Batista Rodrigues Johann, Natanael Henrique Ribeiro Mattos, Fernando Henrique Westphalen, Vânia Portela Ditzel Westphalen
Objective: The aim of this study was to evaluate the use of acetazolamide combined with different agents as intracanal medication in late reimplanted rat teeth. Materials and Methods: In 100 Wistar rats, divided into 5 groups of 20, one of the following medications was used: Acetazolamide liquid (AL); AL with calcium hydroxide powder (ALHC); acetazolamide powder with AL; acetazolamide powder with physiological solution; and calcium hydroxide with physiological solution (control)...
October 2017: European Journal of Dentistry
Brittany A Casperson, Aimee E Wertz-Lutz, Jim L Dunn, Shawn S Donkin
Chemical treatment may improve the nutritional value of corn crop residues, commonly referred to as corn stover, and the potential use of this feed resource for ruminants, including lactating dairy cows. The objective of this study was to determine the effect of prestorage chopping, hydration, and treatment of corn stover with Ca(OH)2 on the feeding value for milk production, milk composition, and dry matter intake (DMI). Multiparous mid-lactation Holstein cows (n = 30) were stratified by parity and milk production and randomly assigned to 1 of 3 diets...
December 13, 2017: Journal of Dairy Science
Wei Fan, Zhuo Huang, Bing Fan
Static magnetic field (SMF) has been shown to biologically affect various microorganisms, but its effects on Enterococcus faecalis, which is associated with multiple dental infections, have not been reported yet. Besides, Enterococcus faecalis was found to be resistant to the alkaline environment provided by a major dental antimicrobial, calcium hydroxide. Therefore, the antibacterial activity of prolonged exposure to moderate SMF (170 mT) and its possible synergistic activity with alkaline pH (pH = 9) were evaluated in the study...
December 11, 2017: Microbial Pathogenesis
Sowmya Shetty, Sam L Kahler, Bill Kahler
The aim of this review was to identify and analyse all studies related to the effects of alkaline materials used in dentistry on roots of teeth. The first part of the review focused on mechanical property alterations of root dentine due to sodium hypochlorite (SH) used as an irrigant solution based on MeSH (Medical Subject Heading) terms from a previous study by Pascon et al in 2009. The second part reviewed literature on calcium hydroxide (CH), mineral trioxide aggregate (MTA) and other alkaline materials used as root canal dressings or filling materials...
December 10, 2017: Materials
Constantin Bălăeţ, Bogdan Ioan Coculescu, Maria Bălăeţ, Gheorghe Manole, Gabi Valeriu Dincă
For the medical practice, our manuscript acts as a signal, despite only presenting three cases which feature the association between hepatocytolysis, haemolysis and hypermagnesaemia. This clinical-biologic triad was highlighted with the workers who through the nature of their profession were exposing themselves periodically to vapours which contained copper sulphate neutralised with calcium hydroxide, a fungicide used for fruit trees. We are exclusively assessing the haematological perturbation. In this aetiological context, the generating mechanism for haemolysis is very probable biochemical, where hypercupraemia interferes with cellular antioxidant defence mechanisms...
December 2018: Journal of Enzyme Inhibition and Medicinal Chemistry
Jonathan Y Lee, Daniel D Kersten, Pete Mines, Thomas A Beltran
INTRODUCTION: The protocols that endodontists implement for regenerative endodontic procedures (REPs) are unknown. The aim of this study was to examine current REP protocols among practicing endodontists in the United States. METHODS: A Web-based survey was sent to 4060 active members of the American Association of Endodontists (AAE). A total of 850 participants completed the survey, representing a 20.9% response rate. RESULTS: Responses indicated 60% reported having performed REPs; most performed 1 to 3 per year...
December 8, 2017: Journal of Endodontics
Agrima Vasudeva, Dakshita Joy Sinha, Shashi Prabha Tyagi, Narendra Nath Singh, Paridhi Garg, Deepti Upadhyay
AIM: This in vitro study was conducted to evaluate the disinfection of dentinal tubules using 2% Chlorhexidine gel, Honey, Aloe vera gel, Curcuma longa, Propolis gel and Calcium hydroxide against Enterococcus faecalis. MATERIALS AND METHOD: Two hundred and ten human mandibular first premolars were infected with Enterococcus faecalis for 21 days. Samples were divided into 7 groups. Group I- Saline (negative control), Group II- 2% Chlorhexidine gel(CHX), Group III- honey, Group IV- Aloe vera gel, Group V- 20% Curcuma longa gel, Group VI- Propolis gel and Group VII -Calcium hydroxide (CH)...
December 2017: Singapore Dental Journal
Hugo Plascencia, Mariana Díaz, Bertram Ivan Moldauer, Mario Uribe, Eddy Skidmore
Dens invaginatus (DI) is a developmental anomaly that poses a significant challenge to the clinician if endodontic treatment is required. The type II (as per Oehlers) form exhibits complex internal anatomy and is frequently associated with incomplete root and apex formation. The purpose of this study is to present two cases of type II DI in the maxillary lateral incisors. In the first case, non-surgical endodontic therapy was performed utilizing calcium hydroxide as an intracanal dressing, showing significant periapical healing of the apical radiolucent area at the six month follow-up...
2017: Iranian Endodontic Journal
Eva Navrátilová, Eva Tihlaříková, Vilém Neděla, Pavla Rovnaníková, Jaroslav Pavlík
In the study of lime as the basic component of historical mortars and plasters, four lime putties prepared from various kinds of lime of various granulometry and by various ways of preparation were evaluated. The rheological properties and micro-morphologic changes, growing of calcite crystals, and rate of carbonation were monitored. The lime putty prepared from lump lime achieves the best rheological properties, yield stress 214.7 Pa and plastic viscosity 2.6 Pa·s. The suitability of this lime putty was checked by testing the development of calcium hydroxide and calcite crystals using scanning electron microscopy and environmental scanning electron microscopy...
December 8, 2017: Scientific Reports
Liguo Wang, Shupeng Zhang, Dapeng Zheng, Haibin Yang, Hongzhi Cui, Waiching Tang, Dongxu Li
In this study, the effects of graphene oxide (GO) on the microstructure of cement mortars were studied using scanning electron microscopy (SEM), thermogravimetric (TG), and X-ray diffraction (XRD) techniques. Cement mortar samples with different proportions of GO (0.02, 0.04, 0.06, and 0.08 wt % based on the weight of cement) were prepared. The test results showed that GO affected the crystallization of cement hydration products, C-S-H (calcium silicate hydrate is the main hydrate product) and CH (calcium hydroxide)...
December 5, 2017: Nanomaterials
Bill Kahler, Nadia Chugal, Louis M Lin
Periapical health is the primary goal of endodontic treatment in mature and immature teeth. In addition, the goals of treatment of immature teeth with arrested root development include root growth to length and maturation of the apex, as well as thickening of the canal wall. These goals are valid for immature teeth that have been subjected to trauma and dental caries or that are the result of developmental anomalies that expose the tooth to the risk of pulp necrosis and consequently result in the cessation of root maturation...
December 5, 2017: Materials
Abdullah Alqedairi, Carlos A Muñoz-Viveros, Eugene A Pantera, Marc Campillo-Funollet, Hussam Alfawaz, Ensanya Ali Abou Neel, Tariq S Abuhaimed
Purpose: Despite the good sealing ability and biocompatibility of mineral trioxide aggregate (MTA), its slow setting, high degradation, and weakness limit its use in surgical endodontics and high stress-bearing areas. This study aimed to develop two new liquids to control these drawbacks. They were prepared from calcium chloride, fumed silica, and hydroxyapatite or calcium phosphate and coded "H" and "P," respectively. Methods: Portland cement, Grey ProRoot® MTA, and white ProRoot MTA were mixed with distilled water (control) or liquid "H" or "P...
2017: International Journal of Dentistry
Chiara Maharaj, Jemitias Chivavava, Alison Lewis
This study aimed to investigate factors that affect the conversion of sulphates and magnesium, and the recovery of gypsum and magnesium hydroxide in the neutralization of a sulphate rich stream using calcium hydroxide, in a laboratory scale seeded fluidised bed crystallizer. Particular focus was on reducing the precipitated fines that escaped with the treated water, through the use of seeds, while removing as much sulphate-compounds from the waste stream as possible. The composition of the total sulphate salts was as follows: 80% magnesium sulphate, calcium sulphate remaining at its saturation concentration (1...
November 27, 2017: Journal of Environmental Management
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