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WO1996034578A9 - Appareil de mise en place, de condensation et de durcissement de matiere de reconstitution dentaire photopolymerisable - Google Patents

Appareil de mise en place, de condensation et de durcissement de matiere de reconstitution dentaire photopolymerisable

Info

Publication number
WO1996034578A9
WO1996034578A9 PCT/CA1996/000270 CA9600270W WO9634578A9 WO 1996034578 A9 WO1996034578 A9 WO 1996034578A9 CA 9600270 W CA9600270 W CA 9600270W WO 9634578 A9 WO9634578 A9 WO 9634578A9
Authority
WO
WIPO (PCT)
Prior art keywords
handpiece
block
light source
light
curing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA1996/000270
Other languages
English (en)
Other versions
WO1996034578A1 (fr
Filing date
Publication date
Priority claimed from CA 2148438 external-priority patent/CA2148438A1/fr
Application filed filed Critical
Priority to AU53947/96A priority Critical patent/AU5394796A/en
Publication of WO1996034578A1 publication Critical patent/WO1996034578A1/fr
Publication of WO1996034578A9 publication Critical patent/WO1996034578A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Definitions

  • new dental materials for restoration and adhesion have been developed having the advantages of roughly matching the colour of a patient's teeth and of being highly durable.
  • these new materials are composites of a photopolymerizabie organic bonding agent and an inorganic filler material .
  • the composite material or resin is applied to the tooth in thin layers and then cured by exposure to visible light, generally in the 400 to 500 nm ., or blue, range.
  • the emission of light for curing from a dental handpiece can be continuous or pulsed.
  • Known apparatuses for curing photopolymerizabie dental materials typically include a lamp disposed within a housing, a power supply, a transformer and timing circuits. Light emitted by the lamp is often conveyed to the proximity of the dental material by means of a flexible or rigid fibre optic wand.
  • a filter for eliminating unwanted optical wavelengths i s usually incorporated into the light path.
  • Quartz halogen lamps have certain disadvantages: First, they produce a great deal of heat, both radiant and conductive . Second, the emission spectrum of the quartz halogen lamp is predom inantly in the red and infrared part of the spectrum , with blue light comprising less than 10% of its output. As a result, the length of time required for curing of the photopolym erizabie material is inconveniently long.
  • a dentist places dental material for restoration in a filling, condenses it with a plugging tool and uses a separate light-delivery handpiece for curing.
  • the material should be cured every 1 - 1 .5 mm .
  • Curing time is typically approximately 20 sec. per exposure .
  • a moderately sized posterior filling requires 8 to 12 exposures, or approximately 3 - 4 minutes.
  • Composite filling failure i s also known to occur when the filling material is under-cured, as is not uncomm on in poorly accessibl e regi on s such as the gingival m argin .
  • the light curing procedure i s completed by an assistant, especially when a long exposure time is required.
  • the assistant does not have first-hand knowledge of the internal form of the cavity preparation, and can frequently expose the wrong area of the tooth.
  • the dentist wastes tim e waiting for the curing to be completed. In a typical day during which 20 fillings could easily be filled, this could add up to approximately 60 to 80 m inutes of wasted, or down, time for the dentist.
  • U .S . Patent No. 5,007,837 to Werly discloses a device for two-step photopolymerization of dental restorative material .
  • the disclosed tool can also transmit air and water through conduits.
  • U . S . Patent No. 5 ,022,856 to Zimble discloses a dental probe including a tip that is used both to measure the depth of a dental pocket and to transmit light.
  • U .S . Patent No. 4,666 ,405 to Ericson discloses an adaptor for pressing the matrix band of a filling, while at the same time delivering light to cure the filling material .
  • the device includes a fibre optic tool.
  • the working end of the tool emits light both from its end and sides .
  • the appropriate working end m ember for a job is selected so that it approximates the shape of the tooth on which work is being done.
  • the device may alternatively be used for providing bleaching light for bleaching teeth with SUPEROXOLTM
  • the handpiece In order to illuminate the handpiece of the Mitnick patent, the handpiece is held by the dentist while an assistant brings a conventional curing light into optical proximity with the handpiece after placement of the dental material .
  • Such double holding of the instrument and light source imm obilizes both the dentist and the assistant.
  • the dentist cannot take a few seconds rest while the assistant cures the filling and the assistant cannot do any other task without risking m oving the instrument and causing restoration failure.
  • Mitnick alternatively suggests having a battery operated light source in the handpiece; however, this could add si gnificant weight and size to the handpiece .
  • Orthodontists also suffer through the drawbacks of stand ⁇ al one light delivery system s.
  • Such system s can not only be used for curing photopolymerizabie dental material for restoration, but also for curing photopolymerizabie dental m aterial for adhesion, such as dental cem ent used for securing orthodontic brackets.
  • an orthodontist Pi cks up a bracket with forceps or a haemostat, picks up photopolym erizabie cement on the bracket, places the bracket on a tooth, cleans off excess cement, removes the forceps and picks up a light-delivery tool .
  • the present invention provides a dental system for use by a dentist,
  • the system has a handpiece shaped for use in the application of dental restorative materials requiring curing by light .
  • the handpiece has a fibre optic bundle directed to an area where curing will be required.
  • the system has a source of light independently supported from the handpiece.
  • a fibre opti c cable is used for optical connection between the fibre optic bundle and the source during application of the material without substantially restricting the motion of the dentist.
  • the body may alternatively have a forceps shape with two prongs.
  • the bundle extends into each prong to respective tips for the delivery of curing light.
  • the forceps-shaped body may have prongs that are each at an angl e pointing toward a midline drawn between the prongs through the handpiece . This aim s the bundle at the tips toward an area where illuminating light is likely to be desired when the handpiece is in use .
  • the invention provides a light source module for connection to a fibre optic cable used with a dental handpiece for light curing of dental m aterial .
  • the module has a light source for producing curing light, a switch, a timing block, an ignition block, and a charging block .
  • the activation of the switch causes the timing block to time for a pre-determined time less than would overheat the light source, while remaining useful for curing the dental material .
  • the ignition block triggers the illumination of the light source while the timing block is timing.
  • the charging block provides illumination power to the light source when the light source i s triggered .
  • Figure 1 is a side elevational view of a dental handpiece according to a first preferred embodiment ofthe present invention
  • Figure 2 is a bottom plan view of the dental handpiece of
  • Figure 3 is an end view ofthe handpiece of Figure 1. looking into the handpiece in the direction of arrow III: of Figure 1;
  • Figure 10 is a perspective view of an application and curing system according to a preferred embodiment of the invention.
  • Figure 15 is a side elevational view of a portion of the handpiece of Figure 7 in use with an orthodontic bracket and a tooth;
  • the body 12 has a hexagonal cross- section, which is preferably approxim ately 6-7 mm . in diameter for most hands, simil ar to a pencil thickness. However, other shapes may also be used.
  • Alternating longitudinal faces 13A, 13B, 13C of the body are recessed and house respective corrosion-resi stant conductive strips 14A, 14B, 14C .
  • the recesses and the strips 14A- 14C are slightly narrower than the respective faces 1 3A-13C .
  • the strips are conveniently of brass, stainless steel , copper or other similar conductive material that is resistant to corrosion or treated for resistance to corrosion.
  • Each strip 14A-14C is connected through the body 12 to a respective conductive wire 16A, 16B , 1 6C of an arming/disarming system .
  • the body has a hollow core 1 7 partially filled by a fibre optic bundle 1 8.
  • a light source 36 has a socket 38 for mating with a plug, not shown, on the opposite end, not shown, of the fibre optic cable 28 to that shown in Figure 5.
  • the socket 38 for mating with a plug, not shown, on the opposite end, not shown, of the fibre optic cable 28 to that shown in Figure 5.
  • the body 62 has a hollow core 69 that extends into each of the prong 61 .
  • a fibre optic bundle 70 fills the core 69 from beneath a socket 71 , similar to socket 38, through respective tips 72 of the prongs 61 .
  • the bundle 70 can be flattened out to take the shape of tips 72.
  • Each tip 72 is preferably angled so that light from the bundle 70 leaves the handpiece 60 at an angle of about 45° to the midline of the forceps, as shown in Figures 8 and 9.
  • Attached to the inner surface 62A of each prong 61 is an adjustable leaf spring 73.
  • the spring 73 preferably terminates about 0 ⁇ 5 mm . short of the respective tip 72. This will provide a good hold on, for example, an orthodontic bracket (later described as component 1 80) and will permit th e tips 72 to emit curing light on each side of the base of the bracket 180.
  • an application and curing system 75 has a three handpiece light source module 76, three handpieces 10, 60, 77, and an air-actuated, on-off foot switch device 78.
  • the handpieces 1 0, 60 are those described previously, while the handpiece 77 is an assistant's handpiece 77.
  • open switch 78 prevents illumination of handpiece 10, even when it is lifted from cradle 87A and grasped on all three strips 14A, 14B , 14C .
  • Switch A prevents illumination of handpiece 10 when it is in its cradle 87A.
  • the handpiece may simply be removed from the fibre optic cable 28 and sterilized in an autoclave or other sterilizing device, not shown.
  • cost-effective materials such as high density polyethylene or another material of light weight and sufficient strength for the body 12, and monofilament optical fibre for the bundle 28, together with manufacturing techniques such as injection moulding for the body 12 and vacuum deposition of the strips 14, would result in a disposable handpiece 1 0 that would be preferable for most dentists.
  • the operation of the handpiece 60 is similar to the operation of the handpiece 10. The extent to which they differ is described later with reference to Figure 15.
  • the operation of the assistant's handpiece 77 is much simpler than the other handpieces 10, 60.
  • the handpiece 77 is removed from the cradle 87C and brought to the desired location of curing light .
  • the button 79 i s depressed to activate the m odule to provide curing light at tip 91 .
  • the assistant's handpiece 77 may be used in all situations where a conventional curing light would be used, but at higher speed, due to the button 79 being within easy access, the light spreading tool 9 1 , and the high power, high efficiency light source 36. It is particularly useful when doing final cures on large multi-surface posterior fil lings and anterior veneers where a large expanse of filling material is to be cured simultaneously.
  • a single handpiece light source m odule 1 00 for providing curing light to an assistant's handpiece 77 has a switch 1 02 , timing block 104, ignition block 1 06, charging block 108 and light source 36 (see Figure 6).
  • the pre-determined time is a function of the advisable length of time the source should be illuminated and the normal amount of tim e required to cure restorative material .
  • the maximum time must be less than the source can take, while the minimum time must be sufficient for curing to take place. This will depend on the charging rate of the charging unit 108 and the efficiency of the source 36.
  • the actual time will depend on the particular set-up and components used in the module 1 00 and the characteristics of the restorative material used.
  • the timing block is not essential , as manual counting may be performed; however, that is not nearly as convenient.
  • a dual handpiece light source module 120 has a sensing block 1 22, an exclusion block 124, a timing block 126, an ignition block 128, a charging block 1 30 and light sources 1 32A and 132B (the same as light source 36).
  • the sensing block 122 has inputs 1 34A, 1 34B, 134C for the leads
  • the sensing block 122 also comprises the switches 86A, 86B and the switches 89A, 89B .
  • the timing block 126 has an input for the device 78.
  • the switch A closes when the handpiece 1 0 is removed from cradle 87A. This is sensed by the switch A in the sensing block 122. When all three strips 14A, 14B and 14C on the handpiece 10 are touched at the same time this is transmitted to the sensing block 122 at the inputs 134A,
  • the exclusion block 124 is activated and the handpiece 60 is locked out.
  • the timing block 126 is in turn activated.
  • the device 78 is switched on and the ignition block 128 allows the light source 132A to draw charge from the charging block 130 and illuminate .
  • the ignition block 1 28 is deactivated and the light source 1 32A i s extinguished.
  • the handpiece 60 is illum inated in a similar manner, provided the handpiece 1 0 has been replaced in its cradle 87A.
  • the three handpiece light source module 76 combines the modules 100 and 120, so similar reference numerals will be used where applicable .
  • Power is applied to the module from a 1 1 5 VAC source.
  • DC power is provided to the module through a transformer T l , rectifying bridge B l and voltage regulator VR set using potentiometer P l and smoothed through capacitor C l , all in a known manner, to produce ground and positive voltage references VO and V+.
  • T l is a step down transformer T l to about 8 VAC, producing a V+ of approximately 9 V .
  • the timing block 104 employs a 555 tim er Ti l which, when grounded, drives an optical coupler 01 to switch on a relay driver comprising NPN transistors N l , N2 and resistors Rl , R2 to open RE2 and close relay RE4.
  • RE2 and RE4 are two double throw relay to ensure that they move simultaneously.
  • the timing block 126, ignition block 128 and charging block 1 30 operate in a similar manner to timing block 104, ignition block 106 and charging block 108.
  • the timing block 126 is activated not only by the foot-activated device 78, but al so by the sensing block 122 through the exclusion block 124.
  • the frequency of the oscillator OS I must be set sufficiently low to avoid random triggering by objects in proximity of the handpiece 10, and sufficiently high to be sensitive to touch by a hand through a latex glove. This will depend on the particular set-up and components used in the m odule 76.
  • the exclusion block 1 24 is two double throw relays RE7, RE8 interconnected so that when one relay, for example RE7, is closed, one end of the other relay RE8 floats so that it cannot be activated.
  • RE7 closes. If the device 78 is closed, then relay RE9 closes and the timing block 126 is activated. This closes relay RE 1 0.
  • the closing of RE7 (activated by closing microswitch A to apply power to RE7) also connects the charging block 1 30 to transformer T5 of the ignition block 128. This triggers the trigger input H VT2 of the light source 132A and illuminates the handpiece 10. After the timing block 126 times out, the light source 132A is extinguished.
  • Module 1 60 allows for additional functions to be added, beyond those for the module 76. For example, sequencing of handpieces 1 0, 60 is possible when more than one handpiece 1 0, 60 is in use. This might occur in a particularly complicated procedure, where the assistant or a second dentist is required to use the second handpiece 10, 60. Alternatively, the module 1 60 could be used in a situation where two dentists are working on two different patients. In other embodiments of the invention, timing could be controlled by measuring the accumulated light output of the lamp. In still other embodim ents, not shown, the device is adapted to receive and m onitor light reflected from the restorative material .
  • the light unit ceases emission .
  • These measuring systems would require a microprocessor and the use of a module such as module 160.
  • the dentist uses the handpiece 60 as a forceps to place a bracket 1 80 with photopolymerizabie cement 1 82 on a tooth 1 84.
  • the leaf springs 73 are used to grip wings 1 86 of the bracket 1 80 to aid in seating on the tooth 1 84.
  • the tips 72 are positioned to be flush with a metal base 1 88 of the bracket 1 80.
  • All of the light emitted from the handpiece 60 is concentrated precisely where it is needed, imm ediately next to the bracket 1 80.
  • the light enters the tooth 1 84 enamel at an advantageous angle, approximately 45° toward the midline of the handpiece 60.
  • the handpiece 60 provides for particularly efficient mounting of metal-based brackets 1 80, which, unlike plastic brackets 1 80, are not easily mounted using conventional quartz halogen curing lights.
  • concentration of emitted light from the handpiece 60 can reduce back-flash into the orthodontist's eyes.
  • each xenon flash tube 42 is replaced by a pair of xenon flash tubes using two 330 V, 1100 ⁇ f electrolytic charging capacitors.
  • Such configurations will depend on the particular tubes used and the intensity and efficiency of illumination required. Where a handpiece receives light from two or more flash tubes, those tubes will likely need to be illuminated simultaneously for the desired combined effect and control of that effect.
  • Pulsed xenon light sources 36 could be replaced by continuous xenon arc light or by an argon laser or by other light sources provi ding illumination of the desired frequency and intensity .
  • the invention i s not restri cted to specifi c dental restorations, for exampl e class II restorations, but can be used in all classes of restoration .
  • the handpieces may also be used to spot tack porcelain veneers.
  • Handpiece 1 0 is ideally suited to deliver l ight to cure the gingival margins of class II ceramic inlays. This area is a serious problem for conventional light curing equipment since the margin is frequently below gum level and is tucked away between the teeth.
  • Handpiece 1 0 can also be used for other dental light cured materials, such as pulp protection cements, for example, light cured DYCALTM, and light cured intermediate materials and temporary cements, for example, RMOTM cement. It can al so be used in the construction and repair of orthodontic appl iances, removable prostheses an d temporary crowns and bridges using photochemi cally activated resins.
  • pulp protection cements for example, light cured DYCALTM
  • RMOTM cement temporary cement

Abstract

La présente invention concerne un appareil de mise en place, de condensation et de durcissement de matière de reconstitution dentaire photopolymérisable et de ciment dentaire sans réduction notable de la liberté de mouvements du dentiste. Une première pièce à main présente une extrémité à utiliser pour la condensation ou l'obturation ainsi que pour l'émission de lumière pour le durcissement. De la lumière visible ayant une longueur d'onde d'environ 400 à 500 nm est émise par impulsions brèves de forte intensité, pour produire un durcissement rapide. Outre l'outil à obturer, l'extrémité de la pièce à main possède une lame qui peut être utilisée pour appliquer de la résine. Ainsi, pour utiliser cette fonction, il suffit de faire tourner l'appareil plutôt que de le faire basculer. La pièce à main est un élément allongé de section hexagonale, et une face de l'outil sur deux présente une bande métallique conductrice. La pièce à main n'est armée que si les trois bandes sont touchées simultanément. Elle n'est pas armée quand elle repose sur une surface telle que la poitrine d'un patient, car deux bandes métalliques, au maximum, y subissent un contact. L'émission de lumière par la pièce à main peut être commandée par une pédale. La pièce à main peut être séparée du câble de fibres optiques qui la relie à une source lumineuse, et elle peut être jetée ou stérilisée et remplacée. Une deuxième pièce à main présente la forme de forceps en vue de sa mise en place autour d'attachements orthodontiques. Chaque branche du forceps est équipée d'un faisceau de fibres optiques, de telle sorte que le déclenchement d'impulsions lumineuses de forte intensité aux extrémités se fait en deux endroits simultanément, de part et d'autre de l'attachement. Un module de source lumineuse est relié à trois pièce à main par des câbles souples de fibres optiques. On a prévu des circuits d'exclusion mutuelle pour empêcher le déclenchement simultané des impulsions lumineuses de certaines pièce à main.
PCT/CA1996/000270 1995-05-02 1996-05-01 Appareil de mise en place, de condensation et de durcissement de matiere de reconstitution dentaire photopolymerisable Ceased WO1996034578A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53947/96A AU5394796A (en) 1995-05-02 1996-05-01 Apparatus for placement, condensation and curing of photopol ymerizable dental restorative material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2148438 CA2148438A1 (fr) 1995-05-02 1995-05-02 Appareil pour la mise en place, la condensation et la reticulation de ciment dentaire photopolymerisable
CA2,148,438 1995-05-02

Publications (2)

Publication Number Publication Date
WO1996034578A1 WO1996034578A1 (fr) 1996-11-07
WO1996034578A9 true WO1996034578A9 (fr) 1997-01-03

Family

ID=4155772

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1996/000270 Ceased WO1996034578A1 (fr) 1995-05-02 1996-05-01 Appareil de mise en place, de condensation et de durcissement de matiere de reconstitution dentaire photopolymerisable

Country Status (3)

Country Link
AU (1) AU5394796A (fr)
CA (1) CA2148438A1 (fr)
WO (1) WO1996034578A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207171A1 (de) * 2002-02-20 2003-09-11 Heraeus Med Gmbh Bestrahlungsgerät mit flexiblem Lichtleitkabel
EP3257470B1 (fr) * 2016-06-17 2019-07-24 Ivoclar Vivadent AG Appareil de durcissement a la lumiere dote d'un circuit de commande

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385344A (en) * 1980-08-29 1983-05-24 Dentsply Research & Development Corp. Visible light apparatus for curing photo-curable compositions
FR2629999A1 (fr) * 1988-04-19 1989-10-20 Hoummada Jamal Lampe a polymeriser des composites photopolymerisables
US5098292A (en) * 1990-03-05 1992-03-24 Sargon Lazarof Dental instrument

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