Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/80—Dental aids fixed to teeth during treatment, e.g. tooth clamps
  • A61C5/85—Filling bands, e.g. matrix bands; Manipulating tools therefor
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C19/00—Dental auxiliary appliances
  • A61C19/003—Apparatus for curing resins by radiation

Definitions

• the present invention relates to an apparatus for use with restorative dentistry and in particular to restoration of Black's Class V caries lesions.
• Dental caries or tooth decay is an irreversible infection and is one of the most common diseases in the world.
• G. V. Black first classified caries lesions into five categories. Later, a sixth category was also included. These classifications are made based on the location, rate of progression, aetiology and affected hard tissue.
• Class V caries affect the gingival third of the buccal or lingual surfaces of teeth.
• the dentist first removes the caries lesion.
• the dentist then fills the cavity with a dental restorative material such as composite resin or glass ionomer cement (GIC).
• GIC composite resin or glass ionomer cement
• the cervical matrix is pressed against the tooth to compress and shape the restorative material.
• the restorative material is chemically-cured or light-cured through the matrix.
• the exterior surface of the restorative material needs to be fully cured before the matrix is removed. If the matrix is removed early, the restorative material can be distorted and the restoration has to be repeated.
• Light-cured resins are typically cured with dental light cure units that emit ultraviolet or visible light. Visible light emissions are usually in the violet to blue end of the visible light spectrum. Light-cured resins are fully cured relatively quickly.
• Chemically-cured resins may take several minutes to fully cure.
• Universal transparent plastic cervical matrices are known and used in modern dentistry.
• Prior art (expired US Pat. 4,449,928, herein incorporated by reference) describes a cervical matrix which consists of a transparent, soft elastic, concave lamina with a rigid stem at the rear that is grasped by forceps or tweezers.
• Colorless, transparent, and blue-tinted matrices are known in the prior art to readily allow the transmission of blue curing light through the matrix.
• the cervical matrix of the present invention aims to overcome the disadvantages of prior art restorative matrices.
• the present invention provides a universal cervical matrix for use in restoration of Class V caries lesions with a chemically-cured dental restoration material, comprising a concave elastic lamina, the lamina comprising at least 2 layers, wherein an outer layer is adapted to absorb ultraviolet and visible light, and wherein an inner layer comprises a material which does not adhere to the dental restoration material.
• Figure 1 is a perspective view of the cervical matrix.
• Figure 2 is a side view of the cervical matrix.
• Figure 3 is a front view of the cervical matrix.
• FIG. 1-3 illustrate an embodiment of the present invention.
• the cervical matrix 1 comprises an elastic lamina.
• the cervical matrix 1 defines a body portion presenting a convex side and a concave side.
• the lamina is made of an outer layer 3 and an inner layer 5.
• the outer layer 3 comprises an elastic energy-absorbing material and provides the main structure of the matrix 1.
• the inner layer 5 of the matrix 1 comprises a coating of non-stick material applied to the bottom surface of outer layer 3.
• the non-stick material may be any material which prevents the matrix from adhering to a dental restoration material.
• the nonstick material may be a non-stick polymer, such as a fluoropolymer.
• Acceptable fluoropolymers include, but are not limited to: polytetrafluoroethylene, perfluoroalkoxy, and fluorinated ethylene propylene.
• the matrix 1 has a concave shape 7.
• the matrix has a handle 9 that provides a site for gripping with tweezers.
• the handle 9 may be made from a different material than the outer layer 3.
• the handle 9 has a hole 11 which provides further options for gripping with tweezers.
• the dentist first prepares a Class V cavity on the tooth surface so that it is ready to receive a chemically-cured restorative material. The dentist then fills the cavity with the restorative material.
• the improved cervical matrix is placed over the restoration site with the inner layer against the tooth and held in place against the tooth using tweezers.
• the non-stick material of the inner layer prevents the restoration material from adhering to the matrix.
• a dental curing light is held close to the matrix and activated. As the curing light emits energy, the outer layer of the matrix absorbs the energy and heats up, transferring some heat energy to the restoration site.
• the increased heat energy in the restoration site increases the rate of reaction of the chemical cure. Typically, the cure time is reduced from two minutes to twenty seconds.
• the lamina is made of three layers: a core layer, an outer layer, and an inner layer.
• the core layer provides the main structure of the matrix and comprises a material which conducts heat, such as metal.
• the outer layer comprises a coating of energy-absorbing material.
• the inner layer comprises a coating of nonstick material.
• embodiments, not illustrated may not include a hole within the handle. Still other embodiments, not illustrated, may include variations on the position of the handle or may not include handle at all. In addition, the size and shape of the matrix may vary in other

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• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dental Preparations (AREA)
• Dental Prosthetics (AREA)

Priority Applications (4)

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Publications (1)

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Citations (4)

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• 2014
  • 2014-07-03 EP EP14742126.7A patent/EP3016609B1/en active Active
  • 2014-07-03 WO PCT/US2014/045478 patent/WO2015003165A1/en not_active Ceased
  • 2014-07-03 US US14/901,653 patent/US10898305B2/en active Active
  • 2014-07-03 CA CA2917156A patent/CA2917156C/en active Active
  • 2014-07-03 JP JP2016524382A patent/JP6912198B2/ja active Active

Patent Citations (4)

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