摘要:
An oscillatory measurement system is disclosed that includes a visual recorder for detecting irregularities such as bubbles in a fluid to be measured. Techniques are provided for scanning the recorder across the oscillatory tube.
摘要:
Kits and methods facilitate chair-side coating of an endodontic cone for improved sealing between the hydrophilic root canal tissue, the hydrophobic elastomer substrate of the endodontic cone, and a hydrophilic sealing resin. The kit includes one or more endodontic cones (e.g., formed of gutta percha) and a micro-dose container containing an adhesive composition. The practitioner can dip the cones into the adhesive composition so as to coat the cones chair-side, just prior to use. The adhesive composition includes an adhesive resin compound comprising at least one hydrophobic region and at least one hydrophilic region. The hydrophobic region is compatible with the hydrophobic elastomer substrate of the endodontic cone, while the hydrophilic region is compatible with a hydrophilic endodontic sealing resin.
摘要:
A method and apparatus for imparting oscillatory motion on a test sample is disclosed in which oscillators, preferably in tubular form, are surrounded by housings. An actuator causes deforming of the housings, and the deforming movement is linked to the oscillators.
摘要:
Kits and methods facilitate chair-side coating of an endodontic cone for improved sealing between the hydrophilic root canal tissue, the hydrophobic elastomer substrate of the endodontic cone, and a hydrophilic sealing resin. The kit includes one or more endodontic cones (e.g., formed of gutta percha) and a micro-dose container containing an adhesive composition. The practitioner can dip the cones into the adhesive composition so as to coat the cones chair-side, just prior to use. The adhesive composition includes an adhesive resin compound comprising at least one hydrophobic region and at least one hydrophilic region. The hydrophobic region is compatible with the hydrophobic elastomer substrate of the endodontic cone, while the hydrophilic region is compatible with a hydrophilic endodontic sealing resin.
摘要:
A system for storing a dental composition having a given shelf-life. The storage system includes a container (e.g., a syringe) and activatable time sensitive marking means disposed on or within the container. Upon activation of the time sensitive marking means, the system begins to indicate time lapsed since activation. The time sensitive marking means allows a dental practitioner to determine whether a dental composition within the container has expired, or how much time remains before the composition expires and should either be used up or discarded.
摘要:
A miniature, passive aerosol particle sampler comprises a scanning electron microscopy mount provided with a collection surface and a removable mesh cover comprising a spacer ring and a mesh sheet. A sampling and analysis method comprises scanning electron microscopy and image analysis to determine a particle-count size distribution. A deposition velocity model comprising a theoretical component and an empirical component is used to determine from the particle-count size distribution the average airborne mass concentration of aerosol particles to which the sampler was exposed.
摘要:
A polarimeter and polarimetry method are disclosed of the type in which light polarization rotating properties of a sample are measured by interposing the sample in the path of a light beam having base plane polarization in a plane of known orientation; along the beam path, compensating or nulling the rotation introduced by the sample, and determining the optical rotational properties of the sample based on the amount of compensation introduced to the light beam. In accordance with one aspect of the present invention, the light beam is subjected to plural compensations along its path the compensations being of at least two different types. Preferably, one of the types of compensation is mechanical, introduced through a device in which polarization rotation is adjusted mechanically, and the second type of compensation is provided through a device in which polarization rotation is controlled electrically. In accordance with another aspect of the invention, a first polarization rotation compensation is performed with the sample in the beam path, the sample is removed, and compensation is restored by performing a second polarization rotation compensation, the second compensation being used to determine the polarization rotation introduced by the sample.
摘要:
An oscillatory measurement system is disclosed that includes a visual recorder for detecting irregularities such as bubbles in a fluid to be measured. Techniques are provided for scanning the recorder across the oscillatory tube.
摘要:
Two-part resin-reinforced cement compositions, kits, and related methods are used for bonding a dental prosthetic appliance to a tooth. A first part includes an amine activator component and a zinc oxide reactive filler, while a second part includes a polymerization initiator (e.g., benzoyl peroxide) and a polymerizable component having a structure including at least one acrylate or methacrylate group at one end and a carboxylic acid group at another end. A temporary cement composition advantageously exhibits reduced compressive and/or bonding strength relative to permanent cement compositions, which provides sufficient strength to facilitate normal use of the teeth while the provisional appliance is in use, while also facilitating easy removal of the provisional appliance for replacement with a permanent appliance at a later time.
摘要:
Water-indicating endodontic monitoring devices include an endodontic cone formed of a water absorptive material, and a chemical indicator comprising at least one cobalt salt applied to the water absorptive material. Alternatively, the water-indicating endodontic points may include a pH-changing material and a pH-sensitive indicator. The devices are manufactured by applying an aqueous solution that includes a moisture sensitive color-changing chemical indicator to the endodontic cone. The solution may be applied by spraying, dipping, or otherwise coating or impregnating the material. Once applied, the endodontic cones are dried so as to be substantially free of moisture. In use, the endodontic cone may be inserted into the root canal of a patient, and when withdrawn, a change in the color of the chemical indicator indicates the presence of moisture within the root canal. The endodontic cone may optionally change to a different color in order to indicate the presence of aqueous sodium hypochlorite within the root canal.