Abstract:
Disclosed are endodontic filling materials and methods. A method for filling a dental root canal may include providing a hydrosetting filling material and inserting the hydrosetting filling material into the dental root canal, the material setting in the root canal to form a biocompatible filling. The hydrosetting filling material comprises a hydrogel former and a filler. The hydrogel former is at least one of a reactive organic hydrogel formers, an inorganic hydrogel formers, and a non-reactive organic hydrogel formers, and the filler is at least one of a self-hardening and a non-hardening filler. Plural filling material precursor compositions that collectively contain hydrogel formers and fillers may be provided.
Abstract:
A composition of matter includes a mixture of styrene derivative monomers and methacrylate/acrylate derivative monomers, which have one or more urethane, carbamate, amide, and/or amine functional groups, and initiators, and the compositions are used to achieve composition control of the forming polymer, with the mole fraction of acrylate/methacrylate and styrene moieties in the forming polymer determined preferably by the chemistry and composition of the feeding monomers rather than the viscosity of the monomers.
Abstract:
A dosimeter for EPR dosimetry systems includes a carbonated hydroxyapatite cement formed by mixing a cement powder and a cement liquid in a ratio of a range of about 0.5 to 5.0 powder-to-liquid ratio. The cement powder includes one or more calcium phosphate compounds and one or more carbonate compounds. The cement liquid includes a sodium phosphate solution. The cement, when irradiated by a radiation source, is capable of producing a measurable signal as a spectrally clean EPR spectrum. Furthermore, the measurable signal is proportional to the received radiation dose
Abstract:
A multi-functional self-healing dental composite may intrinsically repair the micro-crack and prevent the crack from propagating to catastrophic failure, thus significantly extending the service life of the restorative material. The self-healing dental composite includes a dental resin matrix, fillers, healing powder, and healing liquid containing micro-capsules distributed throughout the matrix. Each of the micro-capsules have a silica she formed by the hydrolysis condensation of TEOS in the presence of an aqueous solution of a healing liquid. The healing liquid includes a homo-polymers(s) and/or copolymer(s) of carboxylic acid(s). The healing powder particles distributed throughout the resin matrix, and include alumina, silica and other elements. The self-healing may be triggered automatically as a result of micro-cracking, induced by thereto/mechanical fatigue. During the self-healing process, antibacterial agents may be released to provide protection of the composites against cariogenic bacteria. The self-healing dental composites also may improve tooth remineralization, and caries prevention though fluoride release.
Abstract:
A composition of matter includes one or more functionalized vinylbenzyl components of the formula wherein n is an integer equal to or greater than 1 covalently connected to one or more R functional components; the one or more R functional groups selected from a group including one or more hydroxyl methyl (—CHOH—) moieties and/or derivatives thereof, one or more ethoxy (—CH2—CH2—O—) moieties and/or derivatives thereof, and one or more benzene derivatives; and ether links that connect the functionalized vinylbenzyl components and the R functional components.
Abstract:
A multi-functional, stimuli-responsive material includes a substrate functionalized with a pH-sensitive Azo-QPS compound or co-assemblies containing Azo-QPS compounds. The Azo-QPS compound includes a positively-charged phenyl-azo-pyridinium core, an anion affiliated with the core, a head group, a tail group, a surface bonding group coupling the pH-sensitive Azo-QPS compound to the substrate, and a spacer connecting the pH-sensitive Azo-QPS compound to the surface bonding group.
Abstract:
A bio-active composite material includes one or more organic molecules, each organic molecule including a metal coordinating functional group and an inorganic core attached to the organic molecule. The inorganic core includes one or more metals. The metals may be noble metals and/or non-noble metals. The non-noble metals may be alkali, alkaline earth, transition, post-transition, and metalloid materials. The organic molecule and inorganic core are attached by a covalent bond or a non-covalent bond.
Abstract:
A new azo-type quaternary pyridinium salt (Azo-QPS) shows enhanced activity at acidic conditions (e.g., pH=5); in neutral or basic conditions, this new Azo-QPS shows a much lower level (2-50 times less) anti-bacterial activity. The use of such a “stimulus-enhance” antibiotic can response to the proliferation of bacteria directly. It helps reduce or prevent the build-up of potent antibacterial agents in the oral environment. The antibacterial properties of Azo-QPS are “activated” when the environmental pH becomes acidic; this acidic pH may be indicative of the accumulation of Streptococcus mutans, or the initiation of tooth decay.
Abstract:
A computer-controlled method for forming a composition-controlled product using 3D printing includes disposing two or more liquid reactant compositions in respective two or more reservoirs; and mixing the two or more liquid reactant compositions, which in turn includes controlling by the computer a mass ratio of the mixed two or more liquid reactant compositions. The computer-controlled method further includes scanning, under control of the computer, a mixed liquid reactants nozzle over a substrate; depositing the mixed liquid reactant compositions onto the substrate; and operating, under control of the computer, a light source to polymerize the deposited mixed liquid reactant compositions.
Abstract:
A composition of matter includes one or more functionalized vinylbenzyl components of the formula wherein n is an integer equal to or greater than 1 covalently connected to one or more R functional components; the one or more R functional groups selected from a group including one or more hydroxyl methyl (—CHOH—) moieties and/or derivatives thereof, one or more ethoxy (—CH2—CH2—O—) moieties and/or derivatives thereof, and one or more benzene derivatives; and ether links that connect the functionalized vinylbenzyl components and the R functional components.