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WO1997009002A1 - Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate - Google Patents

Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate Download PDF

Info

Publication number
WO1997009002A1
WO1997009002A1 PCT/US1995/011411 US9511411W WO9709002A1 WO 1997009002 A1 WO1997009002 A1 WO 1997009002A1 US 9511411 W US9511411 W US 9511411W WO 9709002 A1 WO9709002 A1 WO 9709002A1
Authority
WO
WIPO (PCT)
Prior art keywords
paste
cavity
ratio
cup
prophy cup
Prior art date
Application number
PCT/US1995/011411
Other languages
English (en)
Inventor
Neil A. Rosenberg
Original Assignee
Nar Inc.
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 Nar Inc. filed Critical Nar Inc.
Priority to AU46127/96A priority Critical patent/AU4612796A/en
Priority to JP9511158A priority patent/JPH11512015A/ja
Priority to PCT/US1995/011411 priority patent/WO1997009002A1/fr
Publication of WO1997009002A1 publication Critical patent/WO1997009002A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/005—Devices for dental prophylaxis

Definitions

  • the present invention relates to a dental prophy cup used in dental prophylaxis procedures and, in particular, to a novel configuration and construction of such a cup.
  • a dental prophylaxis procedure typically involves the application of an abrasive paste (i.e., a paste containing abrasive particles) to a tooth surface upon which pressure and rotational motion are applied.
  • an abrasive paste i.e., a paste containing abrasive particles
  • the removal of plaque, calculus and stains is facilitated by the resultant abrasion at the interface between the abrasive particles and tooth surface.
  • the pressure and rotational motion are applied to the abrasive paste by means of a prophy cup which comprises a flexible cup-shaped element of about one- quarter inch diameter.
  • a rear portion of the cup is mounted on a drive shaft which rotates the cup at high speed, e.g., about 1500 rpm.
  • the front portion of the cup forms an internal cavity which receives the paste.
  • the wall of the cavity typically includes a plurality of fins extending in a front-to-rear direction.
  • An operator presses the front portion of the cup against a tooth following the insertion of abrasive paste into the cavity.
  • the paste serves as a lubricant, and the abrasives in the paste function to abrade away plaque, calculus, and stains from the tooth surfaces.
  • the cavity 22 is filled with an abrasive paste, the cup is pressed against a patient's tooth surface, and the cup is rotated (preferably at 1500-2000 rpm) .
  • a normal (moderate) force to the cup (e.g., 0.5 pounds)
  • the cup flexes sufficiently so that the tooth surface is contacted by the surfaces 40 of the front ridges 36 under moderate pressure, and possibly also by the surfaces 38 of the rear ridges 34 under higher pressure.
  • the abrasive paste compressed between the cup and tooth abrades away stains and adherent materials such as plaque and calculus.
  • Centrifugal force causes the paste to travel radially outwardly, and thus longitudinally forwardly, due to the forwardly expanding shape of the cavity surface 24. Some of the paste disposed within the cavity is quickly expelled from the cup by the centrifugal force.
  • the present invention relates to a dental prophy cup comprising a body having a rear mounting portion adapted to be mounted on a rotary handpiece for rotation about a longitudinal axis of rotation, and a front tooth- engaging portion formed of an elastomeric material and including a cavity for receiving an abrasive paste.
  • the cavity expands toward a front end of the body.
  • the cavity is defined by a surface in which there is formed a channel arrangement comprised of a paste-delivery channel extending forwardly from a rear portion of the cavity, and a circumferentially extending paste-distribution channel spaced rearwardly from a front end of the body.
  • the paste-delivery channel intersects the paste-distribution channel and terminates at the paste-distribution channel such that paste is induced to flow along the channel arrangement under the urging of centrifugal force during rotation of the body.
  • a ratio (T1/T2) of the thickness (Tl) of a mouth of the cavity to a minimal thickness (T2) of a wall of the tooth-engaging portion at the paste-distribution channel is in the range zero to 0.75 and most preferably is about 0.36.
  • a ratio of D/Tl is preferably less than one, where D is a distance extending from a point P on an external surface of the body to a line L' which L' extends parallel to the axis of rotation and passes through a radially outermost portion of a front end of the body; the point P lies on a bisector of the paste-distribution channel. More preferably, D/Tl is 0.25 to 0.75.
  • a ratio of H/Tl is from 1.0 to 2.0 where H is a distance from the front end of the body to a plane C oriented perpendicular to the axis of rotation A and passing through the point P; the dimension H extends parallel to the axis of rotation A.
  • FIG. 1 is a front perspective view of a dental prophy cup disclosed in U.S. Patent No. 5,360,339 and whose outer edge may tend to invert during operation;
  • FIG. 2 is a longitudinal sectional view taken through the cup of FIG. 1;
  • FIG. 3 is a schematic view depicting the undesired inversion of the outer edge of the prophy cup when placed under pressure
  • FIG. 4 is a longitudinal sectional view of an improved prophy cup according to the invention for preventing inversion of the outer edge;
  • FIG. 5 is an enlarged view of a portion of
  • FIG. 4; and FIGS. 6-8 are schematic views showing the flexing of the cup of FIG. 4 when placed under, light, moderate and heavy pressures, respectively.
  • a dental prophy cup 100 depicted in FIGS. 4-8 comprises a body formed of a highly flexible material, preferably polyisoprene.
  • a rear mounting portion 112 of the cup is configured for being mounted to the drive shank of a rotary handpiece (not shown) by screwing, latching, or snap-on, as is conventional.
  • a tooth-cleaning portion 120 Projecting forwardly from the mounting portion 112 is a tooth-cleaning portion 120 which forms a cavity 122 configured to be symmetrical about a central axis of rotation of the cup. The cross-sectional area of the cavity expands toward the front of the cup.
  • the cavity 122 is formed by an internal surface 124 which forms a paste reservoir 126 at a rear end of the cavity. Disposed in the surface 124 are four paste-delivery channels (not discemable in FIG. 3, but similar to those shown at 28 in FIG. 1) each extending longitudinally forwardly and radially outwardly from the paste reservoir 126, and two longitudinally spaced, circumferentially extending paste- distribution channels 130, 132. Those channels cooperate to form two sets of circumferentially extending ridges 134, 136. A rear set of the ridges 134 is situated longitudinally rearwardly from a front set of the ridges 136.
  • the paste-delivery channels 128 are forwardly divergent, whereby the front ridges 136 are longer than the rear ridges 134 in the circumferential direction. Also, the front ridges 136 are spaced farther from the axis of rotation than are the rear ridges 134 when the cup is in a relaxed (unflexed) condition. Thus, it will be appreciated that the paste-delivery channels 128 become progressively shallower toward their front ends.
  • the front paste-distribution channel 132 is circumferentially continuous, whereas the rear paste- distribution channel 130 is interrupted circumferentially by the paste-delivery channels.
  • the paste-delivery channels 128 thus terminate at the front paste- distribution channel 132, and the front ends of the paste- delivery channels 128 are closed by a circumferentially continuous front wall 142 of the front paste-distribution channel 132.
  • Extending forwardly from the wall 142 is an outwardly flared surface 144 which terminates forwardly at the radially inner edge of a forwardly facing rim surface 146.
  • An external surface of the cup body includes a cylindrical portion 152 extending rearwardly from a radially outer edge of the rim surface 146, and a concave radiused portion 154 extending from a rear end of the cylindrical portion 152 to a front end of a generally frusto-conical portion 156. The latter portion 156 narrows rearwardly toward an external surface of the mounting portion 12.
  • a ratio Tl/L of the minimum thickness Tl of the outermost paste distribution channel 130 to the length L of the cavity 122 has been almost doubled, i.e., has been increased from about 0.10 in the previous cup 10 (FIG. 1) to about 0.19 in the new cup 100 (FIG. 4) .
  • the ratio Tl/L of the new cup 100 is in the range of 0.15 to 0.24.
  • the ratio of thickness Tl to the radius R of the outer end of the prophy cup 100 has also been doubled, i.e., the ratio Tl/R of the new cup 100 is about 0.24, whereas the ratio Tl/R of the old cup 10 was about 0.125.
  • the ratio Tl/R of the new cup 100 is in the range 0.2 to 0.3.
  • a distance D of the prophy cup is defined between a point P and a line L' which extends parallel to the center axis A and passes through a radially outermost edge of the rim surface 146.
  • the point P is a point where a bisector B of the channel 132 intersects the external surface of the cup.
  • the distance D extends perpendicular to the axis A.
  • a dimension H is a distance from the plane of the rim surface 146 to a plane C which lies perpendicular to the axis A and passes through the point P.
  • the distance D was greater than the thickness Tl, i.e., D/Tl was about 1.28.
  • the distance D is less than the thickness Tl, and preferably is less than one- half that thickness. That is, the ratio D/Tl of the new cup is preferably in the range 0.25 to 0.75, and more preferably 0.35 to 0.6, and most preferably about 0.42.
  • the dimension H was more than two times the thickness Tl, i.e., H/Tl was about 2.66. However, in the new cup, the dimension H is between one and two times the thickness Tl. More preferably, the ratio H/Tl is 1.25 to 1.50 and most preferably is about 1.35.
  • the ratio D/H was about 0.48, but in the new cup, that ratio is preferably 0.25 to 0.35 and most preferably is about 0.31.
  • the invention also involves a reduction in the ratio T2/T1, wherein T2 is the thickness of the outer edge 152 of the front end of the cup. That ratio T2/T1 has been reduced to about 0.36 in the new cup 100 from 1.38 in the old cup.
  • the ratio T2/T1 in the new cup is less than 1.0 and in the range zero (0.0) to 0.75.
  • the external surface 156 intersects the rim surface 146 as shown in broken lines 170 in Fig. 5.
  • the reduction in the ratio T2/T1 makes the very outer edge of the front end of the cup more flexible and of a size capable of penetrating below the gum line GL as depicted in Figs. 6-8.
  • the cavity 122 is filled with an abrasive paste, the cup is pressed against a patient's tooth surface, and the cup is rotated (preferably at 1500-2000 rpm) .
  • the tooth-cleaning portion 120 flexes to cause the circumferentially continuous front surface 144 and the surfaces 140 of the front ridges 136 to contact the tooth surface T which is from small to moderate curvature, as shown in FIG. 7.
  • a higher force is applied to the cup to further cause the surfaces 138 of the rear ridges 134 to also contact that tooth surface as shown in FIG. 8.
  • the body of the tooth-cleaning portion 120 of the cup is sufficiently stiff to prevent the front end thereof from inverting in the manner shown in FIG. 3.
  • the outermost edge of the front end of the cup is of suitable size and flexibility to be able to penetrate beneath the gum line GL to perform a subgingival cleaning operation.
  • the cup body is preferably formed of polyisoprene. That material can exhibit various degrees of hardness, depending upon its composition, as is known to those skilled in the art.
  • a prophy cup according to the present invention having a durometer value (i.e., hardness) of 30-40; for cleaning heavy stains, such as tobacco stains, the prophy cup could have a durometer value greater than 50 (e.g., 50-70).
  • a prophy cup is provided which effectively distributes abrasive paste within the cavity and impedes the centrifugally-induced loss of the paste from the cavity.

Landscapes

  • 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 Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Cupule de prophylaxie dentaire (100) comportant un corps flexible à cavité interne (122). Une extrémité arrière de la cavité comprend un réservoir de pâte (126) permettant de stocker une pâte abrasive. Les canaux de distribution de pâte s'étendent vers l'avant depuis le réservoir et entrecoupent les canaux (130, 132) de distribution de pâte avant et arrière s'étendant de manière circonférentille. Sous l'action de la force centrifuge se produisant au cours d'une opération de nettoyage des dents, la pâte est dirigée dans les canaux de distribution (130, 132). Entre les canaux est formée une configuration de nervures (134, 136) pouvant se courber les unes par rapport aux autres afin d'épouser la forme de la surface d'une dent. Le rapport (T2/T1) de l'épaisseur (T2) de l'embouchure de la cavité et de l'épaisseur minimale de la paroi (T1) au niveau d'un canal de distribution de pâte situé plus vers l'avant est compris entre 0,0 et 0,75. Le rapport (T1/L) de l'épaisseur de la paroi (T1) et de la longueur (L) de la cavité est compris entre 0,16 et 0,24.
PCT/US1995/011411 1995-09-07 1995-09-07 Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate WO1997009002A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU46127/96A AU4612796A (en) 1995-09-07 1995-09-07 Dental prophy cup having a paste-distributing channel arrangement
JP9511158A JPH11512015A (ja) 1995-09-07 1995-09-07 ペースト分配溝配列を有するプロフィカップ
PCT/US1995/011411 WO1997009002A1 (fr) 1995-09-07 1995-09-07 Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1995/011411 WO1997009002A1 (fr) 1995-09-07 1995-09-07 Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate

Publications (1)

Publication Number Publication Date
WO1997009002A1 true WO1997009002A1 (fr) 1997-03-13

Family

ID=22249761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/011411 WO1997009002A1 (fr) 1995-09-07 1995-09-07 Cupule de prophylaxie dentaire pourvue d'un systeme de canaux de distribution de pate

Country Status (3)

Country Link
JP (1) JPH11512015A (fr)
AU (1) AU4612796A (fr)
WO (1) WO1997009002A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2147288C1 (ru) * 1999-01-28 2000-04-10 Таланов Борис Петрович Способ предотвращения взрыва энергоносителя в емкости при повышении температуры
EP1192917A1 (fr) * 2000-09-27 2002-04-03 Atsushi Takahashi Dispositif portable destiné au polissage de la surface des dents/ongles
JP2007054625A (ja) * 2005-08-23 2007-03-08 Mcneil Ppc Inc 研磨部材を備えた歯ブラシ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738528A (en) * 1952-08-05 1956-03-20 Sr David S Fridge Prophylactic dental handpiece
US2789352A (en) * 1955-06-27 1957-04-23 Adolph D Wiseman Tooth polishing cup
US4259071A (en) * 1979-07-30 1981-03-31 Fuller Warden Dental polishing cup for use with a rotary dental hand piece

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738528A (en) * 1952-08-05 1956-03-20 Sr David S Fridge Prophylactic dental handpiece
US2789352A (en) * 1955-06-27 1957-04-23 Adolph D Wiseman Tooth polishing cup
US4259071A (en) * 1979-07-30 1981-03-31 Fuller Warden Dental polishing cup for use with a rotary dental hand piece

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2147288C1 (ru) * 1999-01-28 2000-04-10 Таланов Борис Петрович Способ предотвращения взрыва энергоносителя в емкости при повышении температуры
EP1192917A1 (fr) * 2000-09-27 2002-04-03 Atsushi Takahashi Dispositif portable destiné au polissage de la surface des dents/ongles
US6503082B1 (en) 2000-09-27 2003-01-07 Atsushi Takahashi Portable tooth/nail surface cleaning polisher
JP2007054625A (ja) * 2005-08-23 2007-03-08 Mcneil Ppc Inc 研磨部材を備えた歯ブラシ

Also Published As

Publication number Publication date
JPH11512015A (ja) 1999-10-19
AU4612796A (en) 1997-03-27

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Free format text: PEDIDO RETIRADO EM RELACAO AO BRASIL, FACE A IMPOSSIBILIDADE DE ACEITACAO DA ENTRADA NA FASE NACIONAL, TENDO EM VISTA A NAO APRESENTACAO DA TRADUCAO COMPLETA DO PEDIDO, CONFORME EXIGENCIA PUBLICADA NA RPI NO 1856 DE 01/08/2006.