Delivery systems for whitening teeth are provided. The delivery system includes a strip of material sized to cover a front surface of a plurality of teeth and a layer of a tooth whitening substance in contact with the strip of material. The tooth whitening substance includes a gelling agent and a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof. The delivery system further includes a...

Dental technician's tool and retainer combination adapted for the rapid and accurate positioning of a tooth model die repetitively on a model base support, the tool comprising an axially elongated member having an upwardly extended head portion engageable with the tooth model die, a downwardly tapered bottom portion and a downwardly diminishing intermediate portion of cusped transverse cross-section, the tool retainer comprising an apertured body having an internal wall defining a tapered bore o...

An improvement in the wrapping of successive articles in heat-sealable film supplied in a continuous length to an elongated generally tubular former which progressively wraps the film around the sides of the articles and seals the margins together while air is being evacuated from the interior of the wrapping material comprises the provision of a lengthwise slot in the tubular former and placing the vacuum supply pipe outside the former and near the slot so that the articles do not ride on, or c...

An improved method of vacuum packaging by using a specific laminated film as a package film, the laminated film being composed of a plastically deformable layer of a synthetic resin having a yield stress more than 50 kg/cm.sup.2 at a temperature of 23.degree. C. and an elongation of less than 30% at elastic limit at a shaping temperature of 50.degree. to 180.degree. C. and an elastic layer of a synthetic resin having an elongation of more than 40% at elastic limit at the shaping temperature.

A composition and method for bleaching teeth is disclosed wherein red dye is dissolved in a solvent and combined with an inert, inorganic carrier. The composition is mixed chairside by the dental practitioner, with a source of active oxygen to form a bleaching paste, which is applied to prepared teeth. Teeth coated with the paste are then exposed to light of a visible wavelength range of from 400-550 or an argon laser. When the active oxygen is spent, the bleaching paste on the teeth turns color...

A dowel pin locator assembly comprising a U-shaped base member having a race and anchoring members is placed so that the anchoring members are imbedded in the dental stone poured into the negative impression of a conventional impression tray. The race is left exposed, and after the dental stone has set, the positive model formed by the dental stone is separated from the negative impression. The race provides a snug fit with the head of a dowel pin, which is slideably positioned into the race so ...

Pre-shaped, non-custom dental trays are either preloaded with a dental treatment composition (e.g., in the form of a gel) or filled with a dental treatment composition just prior to placement over a person's teeth. The pre-shaped dental tray is thin and flexible, which allows it to be placed over a person's teeth and then approximately conform to the person's teeth. The pre-shaped, non-custom dental trays can therefore perform similar to a customized tray but without having to go through the mor...

The dental model pouring jig of the present invention includes a base member that supports a model base support member and a mold support member. The model base support member is secured to the base member and is capable of mounting a dental model base. The mold support member is adjustably secured to the base member and capable of mounting a mold of a person's teeth. The mold support member is adjustable relative to the model base support member to properly position the mold adjacent the dental...

A head space inserting system is used in a packaging machine for forming, filling and sealing packages. The inerting system directly introduces an inerting gas into the head space of the formed package subsequent to filling and prior to sealing. The inerting system includes an inerting gas source, an inerting gas heater to heat the inerting gas and an inerting gas nozzle. The inerting gas nozzle is disposed within the form, fill and seal packaging machine to introduce the inerting gas directly i...

Packaging apparatus for making hermetically sealed vacuum packages from two continuous webs of plastic packaging material supplied as roll stock. The lower web is formed into product receptacles, and the upper web is applied over the receptacles to serve as the top. The apparatus includes a single-station evacuate-and-seal head where the two webs are initially sealed together around the flanges of the receptacle. The resulting package is then evacuated through a slit in the lower web, and the ev...