EP2296577A1 - Wasserfreie hydrophobe beschichtungszusammensetzung und verfahren für eine intraorale oberfläche - Google Patents

Wasserfreie hydrophobe beschichtungszusammensetzung und verfahren für eine intraorale oberfläche

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Publication number
EP2296577A1
EP2296577A1 EP09762123A EP09762123A EP2296577A1 EP 2296577 A1 EP2296577 A1 EP 2296577A1 EP 09762123 A EP09762123 A EP 09762123A EP 09762123 A EP09762123 A EP 09762123A EP 2296577 A1 EP2296577 A1 EP 2296577A1
Authority
EP
European Patent Office
Prior art keywords
intra
oral
oral surface
coating composition
scanning
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.)
Withdrawn
Application number
EP09762123A
Other languages
English (en)
French (fr)
Inventor
Maurice Moshe Ernst
Johnathan Russel Goldstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Densys Ltd
Original Assignee
Densys Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Densys Ltd filed Critical Densys Ltd
Publication of EP2296577A1 publication Critical patent/EP2296577A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/90—Compositions for taking dental impressions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/004—Means or methods for taking digitized impressions
    • A61C9/0046—Data acquisition means or methods
    • A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam

Definitions

  • the present invention relates generally to compositions and methods for coating teeth, and more specifically to intra-oral compositions and methods used in conjunction with three-dimensional intra-oral scanning.
  • US 6,592,371 discloses systems and methods for generating a three-dimensional (3D) model of a structure include coating the structure with a luminescent substance to enhance the image quality, the luminescent substance having an excitation range; and capturing one or more images of the structure through at least one image aperture each having a frequency sensitivity, wherein the frequency sensitivity of each image aperture is maximized for the luminescent material emission range.
  • dentin Similar to the enamel, dentin also exhibits birefringence as well as having the dentinal tubes act as light pipes— further contributing to blooming.
  • the observed color of a person's tooth is primarily the result of the frequency selective absorption and reflection of the dentin material.
  • Titanium dioxide is a white pigment that is commercially available in one of two crystalline forms: anatase or rutile and is widely used for providing brightness, whiteness, and opacity to such products as paints and coatings, plastics, paper, inks, fibers and food and cosmetics.
  • titanium dioxide particles must be created with an ideal particle size of 0.3-1 ⁇ m. It is further suggested in '371 that in powder form, titanium dioxide must be applied to a thickness of between 40 to 60 particles to achieve opacity on the tooth surface. This introduces an error into the true surface contour of the tooth that can vary from 12 ⁇ m to 60 ⁇ m. Since many dental procedures require surface accuracies of 25-50 ⁇ m, the use of titanium dioxide imposes severe and unrealistic constraints on the error budgets of the remaining parameters involved with making an accurate measurement of the teeth surface contours.
  • titanium dioxide is a crystalline material, it exhibits optical anisotropy so it is important that the applied thickness be sufficient to create a truly opaque surface to eliminate birefringence effects.
  • titanium dioxide is an optically rough surface, it provides no reduction in speckle noise if coherent light is used for the illumination source.
  • titanium dioxide or any other equivalent or mixture, must be applied in a sufficiently thick coating to cover all outer surfaces of a tooth.
  • the titanium dioxide powder sometimes aggregates and forms lumps. It is therefore important to control the aggregate size by sieving or other size- reduction methods.
  • the greatest problem of the current coating methods is that most aqueous imaging solutions/liquid are very difficult to completely dry. This feature also introduces necessary drying times of several seconds to tens of seconds. This requires the patient to sit still with his mouth open and increases the patient time in the dental chair. Additionally, since these coating liquids are aqueous, they are subject to quick dissolution in saliva, removal by the tongue and other intra-oral tissue. Sometimes, a part of the scanner system placed in the mouth will dislodge the coating on part of the tooth's surface.
  • US2003232302A describes a dental instrument and method for imaging the three-dimensional topography of one or more teeth in the oral cavity of an individual is provided.
  • the instrument includes a probe insertable into the oral cavity to receive the image of these surfaces which can then be processed.
  • an auxiliary which projects an air stream toward the surface to be imaged by the probe and acts to evaporate and remove from these surfaces a liquid film coating formed by saliva and other fluids present in the oral cavity, to render these surfaces dry and enhance their reflectivity and in doing so, provide clearer images.
  • US2005153257A discloses systems and methods for imaging a dental occlusal registration impression; developing a digital 3D surface contour model of the occlusal registration impression from the image data; electronically transferring the data representing the digital 3D surface contour model of the occlusal registration impression; fabricating a physical replicate of the occlusal registration impression; correlating features on upper and lower jaw dental models with features on the replicate occlusal registration impression model; and determining occlusal alignment of the upper and lower jaw dental models using the replicate occlusal registration impression model.
  • US2003175658A provides a method for scanning the surface of an object in which moisture such as saliva or water is present on the surface.
  • the method includes the step of applying a saliva and water-resistant composition to the surface, wherein the composition is characterized in that it does not readily wash off the surface after application of the composition to the surface in the presence of saliva or water.
  • the composition forms an opaque film on the surface.
  • the method further includes the step of scanning the surface having the film with a scanner.
  • Several formulations for the composition are disclosed.
  • a suitable binder for scanning teeth and other oral structures is a denture adhesive such as an off-the-shelf denture adhesive, in powder form, that is mixed with the pigment and the alcohol base.
  • a denture adhesive such as an off-the-shelf denture adhesive, in powder form, that is mixed with the pigment and the alcohol base.
  • Other suitable compositions can be derived by persons skilled in the art from the teachings disclosed herein.
  • US 5897696 discloses a process for preparing a water-soluble, radio-opaque paint for marking acrylic resin dental stents includes the steps of preparing a solution comprising 50 ml of ethanol, 6.4 grams of glycerol; 4.0 ml of benzaldehyde; 1.0 ml of glacial acetic acid, and 0.15 grams of hydroxy propyl cellulose.
  • a radio-opaque powder such as 50 grams of barium sulfate powder having a mean particle diameter of about 10 ⁇ m, is then added to the solution.
  • the solution is then mixed to obtain the paint, wherein the paint has a uniform dispersion of the radio-opaque powder.
  • This paint may be used on dental stents to locate and guide placement of dental implants.
  • the method may include the steps of preparing a water-soluble, radio-opaque paint for marking dental stents comprising the steps of preparing a solution described above; adding a radio-opaque powder, such as 50 grams of barium sulfate powder; and mixing the solution to obtain the paint, wherein the paint has a uniform dispersion of the radio-opaque powder.
  • the uniform dispersion may be obtained by using ultrasound.
  • the method comprises applying the paint to a dental stent; placing the stent in contact with a patient's teeth; taking a radiographic image of the stent and the patient's teeth.
  • the stent then is removed from the patient's teeth, and the paint is removed from the stent.
  • the publications hereinabove teach methods for coating teeth prior to 3D- scanning, in which the quality of the coatings, and/or partial inadvertent removal thereof, introduces significant measurement errors in the scanning process. Therefore, there remains a need to provide a method and composition for coating teeth, which enables performance of accurate and precise intra-oral 3D-scanning, without introducing major surface contour errors of the compositions, as described in the publications hereinabove.
  • improved intra-oral surface coating compositions and methods are provided for preparing an intra-oral structure, such as a tooth, for three-dimensional (3D) scanning.
  • a method for providing a sticky coating to an intra-oral surface, such as a tooth, wherein the coating dries into a layer which is of less than 50 micron thickness, more preferably, less than 30 micron thickness and yet more preferably less than 10 micron thickness.
  • the hydrophobic powder comprises titanium dioxide.
  • the coated powder has a low or no wettability.
  • the powder layer is less than 10 microns thick. More preferably it is 0-5 microns thick.
  • the bilayer of sticky coating and powder formed on an intra-oral surface, such as a tooth is preferably less than 30 microns thick, more preferably, less than 20 microns thick and yet more preferably, less than 10 microns thick.
  • This bilayer allows for small to minimal distortions and error in scanning measurements, relative to prior art coatings and paints disclosed hereinabove.
  • the method of providing this bilayer coating is quicker than that of prior art coating methods, thus the dentist does not wait for the application to dry as in the prior art application of coating solutions and paints.
  • the prior art coating methods allow for long drying times during which the oral soft tissues can abrade and mechanically remove coating by physical contact therewith.
  • the present invention methods allows for the application of the powder separately, which creates a fairly hard optically-good surface almost instantaneously, and thus the prior art problem of mechanical removal by the tongue or other soft tissue, or by the scanner, is overcome.
  • the bilayer non-wettable or poorly-wettable coatings of the present invention are more resilient than the prior art coatings, and are sustainable for the duration of the scan.
  • the coating compositions of the present invention are more easily removed that the adhesive-containing prior art compositions.
  • the bilayer coating may be easily removed after performing the scan by toothbrushing.
  • a gingival retraction cord is often placed in a gingival sulcus
  • impression material is forced into the space left when the retraction cord is removed, the retraction cord making this space more obvious and wider.
  • the coating compositions of the present invention allow for good retention of the hydrophobic powder during and after removal of a gingival retraction cord for the preparation of an impression, thus allowing for accurate and well-fitting dental prosthetics.
  • an intra-oral surface coating composition for forming at least one layer on a surface of an intra-oral object for scanning, the composition including; at least one non-toxic volatile organic solvent; at least one GRAS polymer; and at least one hydrophobic metallic oxide powder, wherein the at least one hydrophobic metallic oxide powder is adapted to provide non-wettability to the intra-oral surface.
  • the scanning is three-dimensional scanning.
  • the at least one non-toxic volatile organic solvent includes ethanol.
  • the at least one GRAS polymer includes a polymer selected from the group consisting of a naturally-occurring polymeric material and a semi-synthetic polymeric material.
  • the semi-synthetic polymeric material includes ethyl cellulose.
  • the ethyl cellulose includes at least one Dow Ethocel.
  • the ethyl cellulose includes Dow Ethocel 45.
  • the at least one hydrophobic metallic oxide powder includes hydrophobic titanium dioxide powder.
  • the hydrophobic titanium dioxide powder includes nanoparticles.
  • the nanoparticles may, according to some embodiments of the present invention, have a mean particle size of 10-30 nm.
  • the at least one layer includes a monolayer.
  • the at least one layer includes a bilayer.
  • the monolayer has a thickness of less than 20 microns.
  • the monolayer has a thickness of less than 10 microns.
  • the solvent to polymer ratio by weight 5:1 to 20:1.
  • a bilayer intra-oral surface coating suitable for preparing an intra-oral surface of an object for scanning, the coating including; an underlayer (termed herein "glue") including at least one non-toxic volatile organic solvent and at least one GRAS polymer in a solvent:polymer ratio in a range of 5; l to 20; 1; and an overlayer, suitable for coating the underlayer, the overlayer including least one hydrophobic metallic oxide powder, wherein the overlayer is adapted to provide non-wettability to the intra-oral surface.
  • an underlayer termed herein "glue”
  • an overlayer suitable for coating the underlayer, the overlayer including least one hydrophobic metallic oxide powder, wherein the overlayer is adapted to provide non-wettability to the intra-oral surface.
  • the underlayer has a thickness of 5-30 microns.
  • the underlayer has a thickness of 5-10 microns.
  • the overlayer has a thickness of 0.1-10 microns.
  • the overlayer has a thickness of 0.1-3 microns.
  • the overlayer has a thickness of 0.1-0.5 microns.
  • the scanning is three-dimensional scanning.
  • the at least one non-toxic volatile organic solvent may according to some embodiments of the present invention, include ethanol.
  • the at least one GRAS polymer includes a polymer selected from the group consisting of a naturally-occurring polymeric material and a semi-synthetic polymeric material.
  • the bilayer includes the semi-synthetic polymeric material comprising ethyl cellulose.
  • the ethyl cellulose includes at least one Dow Ethocel.
  • the ethyl cellulose includes Dow Ethocel 45.
  • the at least one hydrophobic metallic oxide powder includes hydrophobic titanium dioxide powder.
  • the bilayer including hydrophobic titanium dioxide powder may include nanoparticles.
  • the nanoparticles have a mean particle size of 10-30 nm.
  • a method for preparing a surface of an intra-oral object for scanning including; applying a composition including at least one non-toxic volatile organic solvent and at least one GRAS polymer in a solvent to polymer ratio in a range of 5;1 to 20; 1 to the surface to form a first coating layer; and applying at least one hydrophobic metallic oxide powder onto the first coating layer to form a second coating layer; wherein the second coating layer is adapted to provide non-wettability to the surface.
  • the method may further include drying the surface prior to applying the first coating layer.
  • the method further includes drying the first coating layer.
  • the first coating layer and the second coating layer are sufficiently thin to prevent a significant scanning optical error.
  • a ratio of the thickness of the first coating layer to a thickness of the second coating layer is from 2:1 to 10:1.
  • the second coating layer has a thickness of less than 10 microns.
  • the scanning is performed employing a commercial scanner selected from a Densys 1 Oral Scanner, a Sirona scanner, a Cerec System scanner, an Orametrix Scanner and a Suresmile System scanner, a3M Brontes 3d scanner, or an E4d scanner
  • a two-phase intra-oral surface coating composition for forming at least one layer on a surface of an intra-oral object for scanning, the composition comprising: a first phase comprising: at least one non-toxic volatile organic solvent; and at least one GRAS polymer; and a second phase comprising at least one hydrophobic metallic oxide powder, wherein said at least one hydrophobic metallic oxide powder is adapted to provide non-wettability to said intra-oral surface.
  • Fig. 1 is a simplified flowchart of a method for applying a bilayer intra-oral coating composition and performing an intra-oral scan, in accordance with a preferred embodiment of the present invention.
  • Fig. 2 is a simplified pictorial illustration of part of a tooth coated in a bilayer intra-oral coating composition, in accordance with a preferred embodiment of the present invention.
  • Fig. 1 is a simplified flowchart 100 of a method for applying a bilayer intra-oral coating composition and performing an intraoral scan, in accordance with a preferred embodiment of the present invention.
  • a dentist or other dental professional typically performs the following method to a patient undergoing an intra-oral 3D scan.
  • the dentist dries the patient's teeth using a standard air dryer used in dental practice for a short period of time (typically two seconds or less), at an air temperature in the range of room temperature to thirty seven degrees Celsius).
  • a sticky composition termed herein "glue”, comprising 1-20% by weight of GRAS (generally regarded as safe) polymer or polymers previously mixed with 10-99% by weight non-toxic volatile organic solvent or solvents is applied to a tooth, a part of a tooth or to several teeth inside the mouth.
  • GRAS generally regarded as safe
  • the polymer serving as a glue is polypropylene glycol (CAS no. 25322-69-4).
  • the glue further comprises 0.1 -71 % water.
  • the application step may include spraying, brushing, coating or any other suitable method known in the art.
  • the polymer or polymers may be natural, semi-synthetic or synthetic.
  • the polymers should provide a syrup-like solution in a non-aqueous solvent or aqueous solvent.
  • Exemplary polymeric agents include, in a non-limiting manner, naturally- occurring polymeric materials, such as locust bean gum, sodium alginate, sodium caseinate, egg albumin, gelatin agar, carrageenan gum, sodium alginate, xanthan gum, quince seed extract, tragacanth gum, guar gum, cationic guars, hydroxypropyl guar gum, starch, amine-bearing polymers such as chitosan; acidic polymers obtainable from natural sources, such as alginic acid and hyaluronic acid; chemically modified starches and the like, carboxyvinyl polymers, polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid polymers, polymethacrylic acid polymers, polyvinyl acetate polymers, polyvinyl chloride polymers, polyvinylidene chloride polymers and the like.
  • naturally- occurring polymeric materials such as locust bean gum, sodium alginate, sodium caseinate, egg
  • Additional exemplary polymeric agents include semi-synthetic polymeric materials such as cellulose ethers, such as methylcellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, hydroxy propylmethyl cellulose, methylhydroxyethylcellulose, ethylcelllulose polymers, methylhydroxypropylcellulose, hydroxyethylcarboxymethylcellulose, carboxymethyl cellulose, carboxymethylcellulose carboxymethylhydroxyethylcellulose, and cationic celluloses.
  • Polyethylene glycol having molecular weight of 1000 or more (e.g., PEG 1,000, PEG 4,000, PEG 6,000 and PEG 10,000) are also considered to be polymeric agents. Mixtures of the above polymeric agents are contemplated.
  • Non-toxic volatile organic solvents may include one or more of short chain alcohols, having up to 5 carbon atoms in their carbon chain skeleton and one hydroxyl group, such as ethanol. Other short chain alcohols having one or more hydroxyl groups may be used if they meet the standard GRAS non-toxic requirements.
  • the glue is dried for a short period of time using a standard air dryer.
  • the dried glue is preferably less than 30 microns thick, and yet more preferably, less than 10 microns thick.
  • a translucent powder is applied to the teeth in situ.
  • the powder typically comprises one or more translucent metal oxides, such as white nanopowders available commercially, such as from , MKNano (M. K. IMPEX CANADA 6382 Lisgar Drive Mississauga, Ontario L5N 6X1 Canada) or Nanostructured & Amorphous Materials, Inc. (16840 Clay Road, Suite 113 Houston, TX 77084, USA).
  • These nanopowders may comprise one or more metals and oxide or other oxides.
  • hydrophobic titanium dioxide is used. See, for example, US Patent 5,565,591, incorporated herein by reference.
  • the metal oxide powders are finely ground to a mean particle size of around 15 nm. According to other embodiments, the mean particle size may be larger.
  • the translucent powder may be colored for certain scanning applications. Again, such nanopowders are known in the art. They too may be obtained commercially.
  • the nanopowder may be sprayed using a typical dental spray appliance, such as, but not limited to, an instrument from Powder Meister, Inc. 2909 Buick Cadillac
  • the dentist can then proceed to perform a scan in a scanning step 150 using any 3D- system known in the art such as those available from Sirona Inc., Cerec System and Orametrix Inc. Suresmile System).
  • a glue removal step 160 the patient removes the glue by standard brushing of his teeth. Alternatively, the dentist may perform this step.
  • step 140 may be integrated into step
  • a composition comprising at least one volatile non-toxic solvent, at least one GRAS polymer and at least one hydrophobic nanopowder may be applied to teeth and then optionally dried in step 130. In such a case, step 140 would not be necessary.
  • the non-wettability of the composition containing the titanium dioxide, as described arises from the non- wettability of the non-aqueous solution.
  • FIX-O-DENT denture adhesive is used. According to US 5,073,604, this denture adhesive comprises lower alkyl vinyl ether-maleic acid copolymer.
  • the non-wettability arises from the use of hydrophobic titanium dioxide, which may, in some cases, be separately applied as a powder, without the adhesive.
  • Fig. 2 is a simplified pictorial illustration 200 of part of a tooth coated 210 in a bilayer intra-oral coating composition.
  • a "glue" layer 220 is fairly smooth and homogeneous.
  • the layer is typically of a thickness of less than 20 microns.
  • a powder layer 235 of at least one hydrophobic metal oxide, such as titanium dioxide is formed on top of the glue layer.
  • the powder layer is preferably less than 10 microns thick.
  • a male Caucasian aged 49 volunteered for the following trial. His teeth were brushed and then air dried for a few seconds A sticky composition was prepared as follows: 10 grams of EthocelTM 45 (Dow, Midland, Michigan, US) were well mixed in
  • the resultant composition was a fairly viscous dispersion. A small amount of the dispersion was sparingly applied to the teeth of the male Caucasian using a paintbrush until all surfaces of his teeth were covered. Thereafter, his teeth were each surface air dried for around two seconds.
  • UV-TITAN M 161 Hydrophobic titanium dioxide
  • Powder Meister Powder Meister, Inc. 2909 Buick Cadillac Blvd. Bloomington, IN 47401, USA.
  • the powder was carefully sprayed on all the surfaces of the teeth.
  • a scanning step 150 the patient's teeth were scanned using a DENSYS 1
  • a glue removal step 160 the patient brushed his teeth using a standard toothbrush. The dentist inspected his teeth thereafter and did not find any traces of the glue or nanopowder.
  • the references cited herein teach many principles that are applicable to the present invention. Therefore the full contents of these publications are incorporated by reference herein where appropriate for teachings of additional or alternative details, features and/or technical background.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cosmetics (AREA)
  • Dental Preparations (AREA)
EP09762123A 2008-06-09 2009-06-05 Wasserfreie hydrophobe beschichtungszusammensetzung und verfahren für eine intraorale oberfläche Withdrawn EP2296577A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13116308P 2008-06-09 2008-06-09
PCT/IB2009/052398 WO2009150596A1 (en) 2008-06-09 2009-06-05 Intra-oral surface non-aqueous hydrophobic coating composition and method

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EP2296577A1 true EP2296577A1 (de) 2011-03-23

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Publication number Priority date Publication date Assignee Title
EP2584994A1 (de) 2010-06-24 2013-05-01 3M Innovative Properties Company Für intraorale scanverfahren geeignete wässrige zusammensetzung
US8999371B2 (en) 2012-03-19 2015-04-07 Arges Imaging, Inc. Contrast pattern application for three-dimensional imaging
US20130260340A1 (en) * 2012-03-29 2013-10-03 3M Innovative Properties Company Powder for enhancing feature contrast for intraoral digital image scanning
RU2646501C2 (ru) 2013-09-11 2018-03-05 3М Инновейтив Пропертиз Компани Композиции для полости рта
US20160213575A1 (en) * 2013-09-11 2016-07-28 3M Innovative Properties Company Coating compositions, dental structures thereof and methods for generating contrast
CN105530999B (zh) 2013-09-11 2019-08-16 3M创新有限公司 口腔组合物、牙齿结构以及递送口腔组合物的方法

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US5137448A (en) * 1984-07-31 1992-08-11 Dentsply Research & Development Corp. Dental impression method with photocuring of impression material in light transmissive tray
JPH0744940B2 (ja) * 1986-12-24 1995-05-17 ライオン株式会社 口腔貼付用基材
WO2002014433A1 (en) * 2000-08-11 2002-02-21 Sun Medical Co., Ltd. Polymerizable composition, cured object obtained therefrom, and composite material
US6592371B2 (en) * 2000-10-25 2003-07-15 Duane Durbin Method and system for imaging and modeling a three dimensional structure
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