USRE33099E - Dental crown, coping and method - Google Patents

Dental crown, coping and method Download PDF

Info

Publication number
USRE33099E
USRE33099E US06870427 US87042786A USRE33099E US RE33099 E USRE33099 E US RE33099E US 06870427 US06870427 US 06870427 US 87042786 A US87042786 A US 87042786A US RE33099 E USRE33099 E US RE33099E
Authority
US
Grant status
Grant
Patent type
Prior art keywords
crown
metal
foil
jacket
dental
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.)
Expired - Lifetime
Application number
US06870427
Inventor
Itzhak Shoher
Aharon Whiteman
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
Grant date

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/0003Making bridge-work, inlays, implants or the like
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00Filling or capping teeth
    • A61C5/70Tooth crowns; Making thereof
    • A61C5/77Methods or devices for making crowns

Abstract

The dental jacket crown of the present invention is prepared from a thin metal foil substrate which is coated with a noble based metal composition having a low fusing temperature and folded in a predetermined manner to form a multiple number of triangular like flaps or pleats. The folded foil represents the coping of the present invention. The coping is mounted over a die of the prepared tooth and the flaps wrapped in overlapping formation and then adapted to the die. The die is removed and the structure heated preferably under a bunsen burner. A veneering material such as porcelain is then coated over the structure to form the crown.

Description

This invention relates to the field of dental restorations and more particularly to the jacket crown restoration, a jacket crown coping for a jacket crown restoration and to a method for forming a jacket crown.

Dental porcelain, a conventional material composed of a mixture of heldspar, quartz and kaolin is commonly used in fabricating dental restorations. The most prevalent crown construction for dental restorations is the porcelain veneer cast metal crown. The cast metal crown is fabricated using a relatively thick metal understructure formed from casting an investment of a wax or plastic pattern of the prepared tooth. Dental porcelain is then applied in layers over part or all of the understructure and fired at high temperature to form a veneer. The metal understructure is preferably formed from a noble based metal or alloy predominantly of gold. The thickness of the cast metal understurcture ranges from typically 0.3 to 0.5 mm. The cast metal understructure is expensive and particularly so for a noble based metal understructure. The weight of a precious metal cast crown is from one to three grams. Since the bulk of the restoration is no greater than that of the tooth structure which originally occupied the space, the use of a thick metal understructure minimizes the permissible thickness for the translucent porcelain veneer. Moreover, exposure of the metal understructure will detract from the esthetics of the restoration.

It is well known that the full porcelain or porcelain jacket crown is esthetically superior to all other crown restorations and is virtually impossible to visually distinguish from a natural tooth. Accordingly, it should be commonplace but is, in general, indicated for use only as a full coverage for an anterior tooth where esthetics is the prime consideration. The limited use of the porcelain jacket crown is attributable to its present method of construction with the strength of the jacket crown dependent upon the strength of the porcelain material composition. Porcelain is inherently structurally weak and fragile. In addition, the present day method of construction requires a high degree of proficiency to establish accurate marginal fit and finish and to avoid poor seating of the crown occlusally relative to the preparation. An improper fit at the gingival margin results in a cement line which readily washes away inviting decay and loosening the crown attachment.

In the conventional process for preparing a porcelain jacket crown a platinum foil is swaged about the prepared die of the tooth to form a mold substrate upon which the porcelain may be fired. The foil is then removed from the substrate before the crown is cemented to the tooth preparation. The latter requirement is considered a principle failing of the conventional porcelain jacket crown preparation. An improved porcelain jacket crown construction in which the swaged foil substrate is itself included as an integral component of the finished porcelain jacket crown is taught and described in U.S. Pat. No. 4,273,580 issued to the Applicants herein, the disclosure of which is herein incorporated by reference. In the latter patent the metal foil substrate forms the core of the jacket crown. A coating of a predetermined noble based metal composition is sintered to the foil substrate whichis then adapted to the die in a manner similar to that in the conventional preparation of a porcelain jacket crown. Although this jacket crown construction will exhibit substantially improved physical properties, its method of construction is still dependent upon the skill and dexterity of a superior dental technician.

The present invention utilizes an entirely new technique for constructing a porcelain jacket crown which overcomes all of the shortcomings of the conventional porcelain jacket crown in mechanical properties, construction and preparation. In fact the preformed coping of the present invention is readily adaptable by a technical novice without any special skills. Use of the preformed coping in accordance with the presesnt invention simplifies construction of a porcelain jacket crown and significantly contributes to uniformity in result without the dependency on the skill of the dental technician.

The porcelain jacket crown of the present invention may be prepared more quickly and more accurately relative to conventional methods of preparation. Moreover, the dental laboratory does not have to wax, invest, cast or polish the final metal structure as is done in making a porcelain veneer cast metal crown.

In addition, the present invention may be used with any conventional tooth margin preparations such as: chamfer, shoulder, chamfer bevel, shoulder bevel, knife edge and feather edge. The margin may also be reinforced if desired. The porcelain jacket crown may also be reinforced if desired. The porcelain jacket crown prepared in accordance with the present invention will have an almost invisible metal line at the gingiva. An even further distinct advantage of the present invention lies in the reduction in the weight of the metal in a jacket crown of the present invention which is only 20 to 30 milligrams.

Accordingly, it is the principle object of the present invention to provide a porcelain jacket crown having a high resistance to fracture comparable with or even greater than the conventional porcelain veneer cast metal crown.

Another object of the present invention is to provide a preformed coping for forming the porcelain jacket crown of the present invention.

An even further object of the present invention is to provide a method for constructing a jacket crown.

Further objects and advantages of the present invention will become apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings of which:

FIG. 1 is an enlarged perspective of a segment of the preferred metal foil starting material of the present invention in its preferred circular geometry;

FIG. 2 is a perspective of a dental coping prepared in accordance with the present invention from the metal foil starting material of FIG. 1;

FIG. 3 is a transparency in perspective of the dental coping of FIG. 2 in the initial stage of being molded to a die of the prepared tooth;

FIG. 4 is another transparency in perspective of the dental coping in FIG. 3 in its final stages of being adapted to the die of the prepared tooth; and

FIG. 5 is an illustration in perspective of the dental coping of FIG. 3 as a standing structure after having been adapted to the die.

Referring now to FIG. 1 in which a metal foil segment 10 is shown representing the starting material for preparing the jacket crown in accordance with the present invention. The metal foil segment 10 is preferably circular in geometry and composed of a thin foil metal substrate 12 of platinum or another high fusing temperature metal and a thin coated layer 14 superimposed on the foil metal substrate 12. The coated layer 14 should be of a noble metal based composition preferably with gold as its major constituent. There are numerous gold based compositions shown to those skilled in the dental arts for use in the preparation of a dental restoration and upon which a veneering material such as porcelain may be fired. The preferred composition of the coated layer 14 should have a relatively low melting temperature characteristic and contain at least 50% gold with one or more of the following elements in combination: silver, palladium, platimum, iridium, copper and aluminum. A conventional binder may be added to the composition so that it may spread more readily over the platinum foil substrate 12 to form the coated layer 14. The coated layer 14 should form a bonded matrix with or without the application of heat which has the physical properties of being flexible, malleable and spongy. The gold based composition should have a low temperature fusing characteristic such that it flows after sufficient heat is applied for reasons which will be explained in greater detail hereafter.

The thickness of the platinum foil substrate 12 should be in the range of between 15 to 50 microns with an optimum thickness of 25 to 27 microns. The thickness of the gold based layer 14 should be between 10 to 50 microns and preferably between 20 to 25 microns.

The metal foil segment 10 is preferably round although any geometry may be used in which multiple folds may be made which will partially overlap one another when adapted to a die as hereinafter explained. When the metal foil segment 10 is circular its diameter for a typical die is between about 22 to 28 mm.

The metal foil segment 10 of FIG. 1 is folded into a predetermined geometrical shape having a multiple number of fold lines 18 as shown in FIG. 2 for forming the dental coping 16 of the present invention. The multiple fold lines 18 may be formed by hand or by machine. The technique or mechanism employed to perform the folding operation is not critical to the present invention. It is the arrangement of multiple fold lines in a predetermined array to form multiple flaps or pleats which forms the underlying theory in the preparation of a jacket crown in accordance with the present invention.

An example of a hand folding operation that may be used for forming a preferred arrangement of fold lines 18 from the metal foil segment 10 involves placing the metal foil segment 10 over one end of a cylindrical support bar (not shown) and squeezing the segment 10 into fold lines 18 using the thumb and forefinger of one hand while holding the segment 10 in place over the support bar. In such case each fold line 18 will radially extend from a central unfolded area 20. The central unfolded area 20 will conform in dimension to the support bar upon which it was placed in forming the fold lines 18. The diameter of the unfolded area is not significant provided it is small relative to the total area of the segment 10.

Another hand folding operation simply involves folding the segment 10 in half and then in quarters until the desired number of fold lines 18 are formed. This is a somewhat less desirable procedure since the fold lines will extend radially from a central point or apex without forming an unfolded area 20 in the center of the segment 10. It should however be understood that forming an unfolded area 20 is not critical to the invention.

The fold lines 18 form substantially triangular like flaps or pleats 22 with a curved base line 24 shown as a straight line in FIGS. 2 and 3 for simplicity. Each triangular angular like flap 22 has two fold lines 18 with a common fold line 18 between adjacent pairs. The number of flaps 22 that should be formed may vary with four to sixteen being preferred and with eight being the optimum number for most typical jacket crown preparations.

The preferred geometry of the dental coping 16 includes a multiple number of fold lines 18 which radially extend from a centrally located unfolded area 20 in an arrangement which form triangular-like flaps 22. The dental coping 16 should preferably be modified to include a plurality of small slotted openings 26. These openings 26 may be made as an integral part of the manufacturing operation of the dental coping 16 or as part of the procedure of the dental technician in the preparation of the jacket crown as will hereinafter be explained in greater detail. The slotted openings 26 are slits formed in the segment 10 preferably along the fold lines 18. Neither the position of the slotted openings 26, their size or number are critical. Their primary function is to provide access for the noble metal composition to flow to the underside or uncoated surface of the platinum foil substrate 12 when heat is applied to the finished coping 16 during the final preparatory step in the preparation of a jacket crown.

FIGS. 3-6 illustrate the preferred sequence of steps in the preparation of a jacket crown in accordance with the present invention. The preformed coping 16 is placed over a die 28 of a prepared tooth with the unfolded area 20 seated upon the top or occlusal end 29 of the die 28. The die 28 is conventionally prepared from an impression of the prepared tooth and is a replica thereof. The unfolded area 20 facilitates centering the dental coping 16 over the die 28 and makes the coping 16 easier to adapt to the die 28 as is more readily apparent from FIG. 4.

Each of the flaps 22 are wrapped tightly around the die 28 in a uniform clockwise or counter clockwise oriented sequence resulting in an arrangement of overlapping flaps 22 as shown in FIG. 4. The coping 16 should also extend over the gingival margin 31. The die 28 and coping 16 is then placed in a swaging device (not shown) or pressure is applied by hand to adapt it to the die 28. The coping 16 is then removed from the die leaving a free standing structure 33 as shown in FIG. 5. Heat is then applied to the free standing structure 33 by placing it over the flame of a bunsen burner for between five to thirty seconds based on flame temperature until the structure 33 gets cherry red and shiny. Alternatively the free standing structure 33 can be placed in a furnace and sintered at a temperature of about 1020° to 1070° C. until the same result is achieved. The low fusing preferably gold based composition of the metal layer 14 will flow through the slotted openings 26 to form a compact matrix between the foil substrate 12 and the gold based composition on the undesirable thereof without any air pockets.

After the heating step, porcelain can be directly applied in a conventional manner to form the jacket crown of the invention. It is however desirable but not essential, to coat the outside surface of the free standing foil structure 33 using a bonding composition to achieve an unbreakable bond between the porcelain layers and the foil structure 33. A preferred bonding composition is disclosed in a copending U.S. patent application Ser. No. 171,255 entitled Bonding Material and Method For Bonding A Ceramic To A Nobel Based Metal, and now abandoned, the disclosure of which is herein incorporated by reference. The bonding material disclosed in this application includes a nobel based metal composition in combination with a halide of a noble metal preferably a noble metal halide. The bonding material must be sintered to the foil structure 33 at a temperature above 1600° F. This can be achieved simultaneously with the firing of the required porcelain outer layers. Any number of porcelain layers may be applied and fired for forming the jacket crown of the invention. Generally, three or more layers of varying dental porcelain composition starting with an opaque layer are built up and fired at temperatures in a range from about 1600° to 1820° F. Before firing the final glaze the area below the gingival margin is cut and the porcelain shaped and finished to the correct gingival margin for the prepared tooth.

After the final glaze the crown is ready to be inserted into the mouth and cemented to the tooth using any conventional dental cement composition. It is suggested practice to roughen the interior of the crown i.e. the unerside of the inner substrate layer 12 before the crown is cemented to the tooth. The roughness maybe achieved by sand blasting.

Although the invention was described in connection with the application of porcelain for forming a porcelain jacket crown it is equally applicable to the use of any polymer veneering material such as conventional dental acrylics in substitution of the porcelain ceramic material for the superstructure of the jacket crown.

Claims (17)

What we claim is:
1. A .[.jacket.]. .Iadd.dental .Iaddend.crown comprising a composite body .[.including.]. .Iadd.formed from .Iaddend.a thin foil of high fusing temperature metal having a surface geometry conforming to a die to which it has been adapted .[.with the foil having at least a minimum of three folded over pleats with each pleat forming a triangular like flap in the unfolded position,.]. a thin coating of a .[.noble.]. .Iadd.gold .Iaddend.based .Iadd.noble .Iaddend.metal composition superimposed over one surface of said .[.thin metal foil and disposed beneath the folded over pleats.]. .Iadd.high fusing temperature metal with said composite body having a plurality of folded over sections which radially extend from an axis through the center of the foil in a symmetrical arrangement about the center of the foil .Iaddend.and a relatively thick outer coating of a dental veneering material.
2. A .[.jacket.]. .Iadd.dental .Iaddend.crown as defined in claim 1 wherein said folded over .[.pleats overlap one another.]. .Iadd.sections constitute pleated sections with each pleated section represented by fold lines which form a triangular like flap in the unfolded position.Iaddend..
3. A .[.jacket.]. .Iadd.dental .Iaddend.crown as claimed in claim 2 wherein said thin foil is composed of platinum and wherein said veneering material is fired on dental porcelain.
4. A .[.jacket.]. .Iadd.dental .Iaddend.crown as claimed in claim 2 wherein said .[.noble.]. .Iadd.gold .Iaddend.based .Iadd.noble .Iaddend.metal composition comprises at least 50% gold and at least one of the following elements selected from the group consisting of: silver, palladium, iridium, copper and aluminum.
5. A .[.jacket.]. .Iadd.dental .Iaddend.crown as claimed in claim 4 wherein the weight of said noble based metal in said jacket crown is between about 20 to 30 milligrams.
6. A dental coping for a .[.jacket.]. crown restoration comprising a thin foil of high fusing temperature metal .[.arranged in a prefolded geometrical configuration having at least a minimum of three pleated sections with each pleated section represented by fold lines which form a triangular like flap and a coating of a noble based metal composition superimposed upon the surface of said thin foil over said pleated sections.]. .Iadd.having a thin gold based noble metal composition disposed upon the surface of said thin foil with said thin foil arranged in a prefolded geometrical configuration having a plurality of overlapping sections.Iaddend..
7. A dental coping as defined in claim .[.6.]. .Iadd.20 .Iaddend.wherein each .[.pleated section is of a size such that upon folding it will overlap an adjacent pleated section.]. .Iadd.section is pleated and represented by fold lines which form a triangular like flap in the unfolded configuration..Iaddend.
8. A dental coping as defined in claim .[.7.]. .Iadd.6 .Iaddend.wherein said thin foil was circular in shape before folding.
9. A dental coping as defined in claim 8 wherein said fold lines radially extend from an unfolded area substantially in the center of said coping with the unfolding area being small compared to total area of the foil.
10. A dental coping as defined in claim 9 wherein said thin foil is composed of platinum.
11. A dental coping as defined in claim 10 further comprising a plurality of small slotted opening arranged about the periphery of said coping.
12. A method of forming a dental .[.jacket.]. crown comprising
preparing a thin metal foil of high fusing temperature metal into a substantially circular substrate;
coating one surface of the foil substrate with a noble based metal composition having a low fusing temperature of below about 1070° C.;
forming a multiple number of fold lines in said coated foil substrate with each two adjacent fold lines substantially defining a triangular like flap;
mounting said coated foil substrate over a die of the prepared tooth with the coated surface exposed;
partially overlapping each flap about said die in a clockwise or counterclockwise sequence with the foil tightly wrapped about said die;
adapting said tightly wrapped foil to said die;
removing said die for providing an inner structure for said jacket crown;
heating said inner structure above the low fusing temperature of said noble based metal composition; and
coating a veneering material over said inner structure.
13. A method as claimed in claim 12 further comprising the step of forming small slotted openings about the periphery of said coated foil substrate following the folding step.
14. A method as claimed in claim 13 wherein said slotted openings are formed along the fold lines.
15. A method as claimed in claim 14 wherein said veneering material is a fired on procelain.
16. A method as claimed in claim 15 wherein said heating step is performed by placing said inner structure under the flame of a bunsen burner for between 5 to about 30 seconds. .Iadd.
17. A method of forming a dental coping for a dental crown comprising the steps of forming a thin foil metal composite of a high fusing temperature metal and a superimposed low fusing temperature metal, prefolding said foil to form a plurality of foldable sections which radially extend from an area in the center of the foil adapted to be mounted over the occlusal surface of the tooth to be restored in a symmetrical arrangement with respect to the center of the foil, folding the sections over, adapting said composite foil to a die of the tooth to be restored, removing said composite foil from said die and heating said composite foil to a temperature above the low fusing metal temperature so as to cause said low fusing temperature metal to melt for forming a compact matrix between said high fusing temperature metal layer, the folded over sections of foil, and the melted gold based low fusing temperature metal. .Iaddend. .Iadd.18. A method as defined in claim 17 wherein said composite body is heated by subjecting it to the flame of a bunsen burner or in a furnace at a temperature of about 1020° C. to 1070° C. .Iaddend. .Iadd.19. A method as defined in claim 18 wherein the folded over sections of said composite body are folded to overlap one another. .Iaddend. .Iadd.20. A dental coping as defined in claim 9, wherein said folded over sections overlap. .Iaddend.
US06870427 1982-09-02 1986-06-04 Dental crown, coping and method Expired - Lifetime USRE33099E (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06414415 US4459112A (en) 1982-09-02 1982-09-02 Dental jacket crown, coping and method of forming a crown
US06870427 USRE33099E (en) 1982-09-02 1986-06-04 Dental crown, coping and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06870427 USRE33099E (en) 1982-09-02 1986-06-04 Dental crown, coping and method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06414415 Reissue US4459112A (en) 1982-09-02 1982-09-02 Dental jacket crown, coping and method of forming a crown

Publications (1)

Publication Number Publication Date
USRE33099E true USRE33099E (en) 1989-10-24

Family

ID=27022538

Family Applications (1)

Application Number Title Priority Date Filing Date
US06870427 Expired - Lifetime USRE33099E (en) 1982-09-02 1986-06-04 Dental crown, coping and method

Country Status (1)

Country Link
US (1) USRE33099E (en)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131847A (en) * 1991-04-08 1992-07-21 Ijuin Dental Laboratory Inc. Dental crown and method for making same
USD452010S1 (en) 2001-01-26 2001-12-11 Ronald E. Huffman Full arch attachment plate
USD452009S1 (en) 2001-01-26 2001-12-11 Ronald E. Huffman Quadrant dental model base having a single row of apertures
USD452320S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Encased stone dental model base
USD452319S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Quadrant attachment plate
USD452322S1 (en) 2001-02-27 2001-12-18 Ronald E. Huffman Projecting pin dental model base with detachable articulator attachment bar
USD452321S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Quadrant dental model base having a double row of apertures
USD452568S1 (en) 2001-02-27 2001-12-25 Ronald E. Huffman Projecting pin dental model base
USD452566S1 (en) 2001-01-26 2001-12-25 Ronald E. Huffman Full arch dental model base having a double row of apertures
USD452567S1 (en) 2001-01-26 2001-12-25 Ronald E. Huffman Full arch dental model base having a single row of apertures
USD456904S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Projecting pin quadrant dental model base
USD456903S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Quadrant dental model base with projecting variable height pins
USD456902S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Hollow body full arch dental model base
USD457243S1 (en) 2001-05-09 2002-05-14 Ronald E. Huffman Solid quadrant winged dental model base
USD457636S1 (en) 2001-05-09 2002-05-21 Ronald E. Huffman Solid full arch dental model base
USD457637S1 (en) 2001-05-09 2002-05-21 Ronald E. Huffman Encased stone quadrant, winged dental model base
USD457964S1 (en) 2001-05-09 2002-05-28 Ronald E. Huffman Full arch dental model base with projecting variable height pins
USD457963S1 (en) 2001-05-09 2002-05-28 Ronald E. Huffman Full arch dental model base with projecting variable height pins and removeable attachment bar
US20020102514A1 (en) * 2001-01-26 2002-08-01 Huffman Ronald E. Encased stone dental model base body and method
USD464432S1 (en) 2001-09-28 2002-10-15 Ronald E. Huffman Encased stone dental model base
USD464431S1 (en) 2001-09-28 2002-10-15 Ronald E. Huffman Dental model base having a double row of apertures
USD464733S1 (en) 2001-09-19 2002-10-22 Ronald E. Huffman Dental model base having two rows of pins
USD464732S1 (en) 2001-09-19 2002-10-22 Ronald E. Huffman Dental model base having two rows of stationary pins for random location of teeth
USD465027S1 (en) 2001-09-28 2002-10-29 Ronald Huffman Dental model base having a single row of apertures
US6471513B1 (en) 2001-01-29 2002-10-29 Ronald E. Huffman Dental model base assembly
US6884068B2 (en) 1999-07-07 2005-04-26 Ronald E. Huffman Dental model base configured for customized aperture formation
US20050106530A1 (en) * 2002-08-07 2005-05-19 Huffman Ronald E. Dental modeling apparatus
US20060078847A1 (en) * 2000-09-29 2006-04-13 Kwan Norman H Dental implant system and additional methods of attachment
USD529177S1 (en) 2004-11-05 2006-09-26 Ronald E. Huffman Dental model base with a plurality of indexing pins
USD529178S1 (en) 2005-06-10 2006-09-26 Ronald E. Huffman Opposing dental model base
USD529614S1 (en) 2005-06-10 2006-10-03 Ronald E. Huffman Opposing dental model base quadrant
USD530014S1 (en) 2004-11-05 2006-10-10 Ronald E. Huffman Dental model base quadrant with a plurality of indexing pins
US7690919B2 (en) 2006-03-28 2010-04-06 Huffman Ronald E Dental articulator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US503419A (en) * 1893-08-15 Preparing dental fillings
US1172918A (en) * 1914-11-23 1916-02-22 Charles J Thorp Artificial tooth-crown.
US1248242A (en) * 1917-06-26 1917-11-27 Henry Ward Babcock Dental process.
US1609550A (en) * 1926-05-01 1926-12-07 Jr Fernando Oscar Jaques Expansible tooth crown
US1734676A (en) * 1928-05-10 1929-11-05 Jr Fernando Oscar Jaques Dual tooth crown
US2700822A (en) * 1952-08-26 1955-02-01 Samuel J Infante Artificial tooth structure
US4273580A (en) * 1979-04-04 1981-06-16 Itzhak Shoher Reinforced jacket crown and method of construction

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US503419A (en) * 1893-08-15 Preparing dental fillings
US1172918A (en) * 1914-11-23 1916-02-22 Charles J Thorp Artificial tooth-crown.
US1248242A (en) * 1917-06-26 1917-11-27 Henry Ward Babcock Dental process.
US1609550A (en) * 1926-05-01 1926-12-07 Jr Fernando Oscar Jaques Expansible tooth crown
US1734676A (en) * 1928-05-10 1929-11-05 Jr Fernando Oscar Jaques Dual tooth crown
US2700822A (en) * 1952-08-26 1955-02-01 Samuel J Infante Artificial tooth structure
US4273580A (en) * 1979-04-04 1981-06-16 Itzhak Shoher Reinforced jacket crown and method of construction

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Theory and Practice of Crown and Bridge Prosthesis", by Stanley D. T. Tylman, 1947, pp. 523-531.
Theory and Practice of Crown and Bridge Prosthesis , by Stanley D. T. Tylman, 1947, pp. 523 531. *

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131847A (en) * 1991-04-08 1992-07-21 Ijuin Dental Laboratory Inc. Dental crown and method for making same
US6884068B2 (en) 1999-07-07 2005-04-26 Ronald E. Huffman Dental model base configured for customized aperture formation
US20060078847A1 (en) * 2000-09-29 2006-04-13 Kwan Norman H Dental implant system and additional methods of attachment
USD452009S1 (en) 2001-01-26 2001-12-11 Ronald E. Huffman Quadrant dental model base having a single row of apertures
USD452320S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Encased stone dental model base
USD452319S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Quadrant attachment plate
USD452321S1 (en) 2001-01-26 2001-12-18 Ronald E. Huffman Quadrant dental model base having a double row of apertures
USD452010S1 (en) 2001-01-26 2001-12-11 Ronald E. Huffman Full arch attachment plate
USD452566S1 (en) 2001-01-26 2001-12-25 Ronald E. Huffman Full arch dental model base having a double row of apertures
USD452567S1 (en) 2001-01-26 2001-12-25 Ronald E. Huffman Full arch dental model base having a single row of apertures
US20020102514A1 (en) * 2001-01-26 2002-08-01 Huffman Ronald E. Encased stone dental model base body and method
US7044734B2 (en) 2001-01-26 2006-05-16 Huffman Ronald E Encased stone dental model base body and method
US6471513B1 (en) 2001-01-29 2002-10-29 Ronald E. Huffman Dental model base assembly
USD452322S1 (en) 2001-02-27 2001-12-18 Ronald E. Huffman Projecting pin dental model base with detachable articulator attachment bar
USD452568S1 (en) 2001-02-27 2001-12-25 Ronald E. Huffman Projecting pin dental model base
USD456903S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Quadrant dental model base with projecting variable height pins
USD457964S1 (en) 2001-05-09 2002-05-28 Ronald E. Huffman Full arch dental model base with projecting variable height pins
USD457963S1 (en) 2001-05-09 2002-05-28 Ronald E. Huffman Full arch dental model base with projecting variable height pins and removeable attachment bar
USD456904S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Projecting pin quadrant dental model base
USD457243S1 (en) 2001-05-09 2002-05-14 Ronald E. Huffman Solid quadrant winged dental model base
USD457636S1 (en) 2001-05-09 2002-05-21 Ronald E. Huffman Solid full arch dental model base
USD456902S1 (en) 2001-05-09 2002-05-07 Ronald E. Huffman Hollow body full arch dental model base
USD457637S1 (en) 2001-05-09 2002-05-21 Ronald E. Huffman Encased stone quadrant, winged dental model base
USD464732S1 (en) 2001-09-19 2002-10-22 Ronald E. Huffman Dental model base having two rows of stationary pins for random location of teeth
USD469537S1 (en) 2001-09-19 2003-01-28 Ronald E. Huffman Dental model base having two rows of stationary pins for random location of teeth
USD481797S1 (en) 2001-09-19 2003-11-04 Ronald E. Huffman Dental model base having two rows of stationary pins for random location of teeth
USD464733S1 (en) 2001-09-19 2002-10-22 Ronald E. Huffman Dental model base having two rows of pins
USD465027S1 (en) 2001-09-28 2002-10-29 Ronald Huffman Dental model base having a single row of apertures
USD468432S1 (en) 2001-09-28 2003-01-07 Ronald E. Huffman Dental model base having a single row of apertures
USD468431S1 (en) 2001-09-28 2003-01-07 Ronald E. Huffman Encased stone dental model base
USD464432S1 (en) 2001-09-28 2002-10-15 Ronald E. Huffman Encased stone dental model base
USD464431S1 (en) 2001-09-28 2002-10-15 Ronald E. Huffman Dental model base having a double row of apertures
US20050106530A1 (en) * 2002-08-07 2005-05-19 Huffman Ronald E. Dental modeling apparatus
US7341451B2 (en) 2002-08-07 2008-03-11 Huffman Ronald E Dental modeling apparatus
US7347689B2 (en) 2002-08-07 2008-03-25 Huffman Ronald E Dental modeling methods
USD529177S1 (en) 2004-11-05 2006-09-26 Ronald E. Huffman Dental model base with a plurality of indexing pins
USD530014S1 (en) 2004-11-05 2006-10-10 Ronald E. Huffman Dental model base quadrant with a plurality of indexing pins
USD529178S1 (en) 2005-06-10 2006-09-26 Ronald E. Huffman Opposing dental model base
USD529614S1 (en) 2005-06-10 2006-10-03 Ronald E. Huffman Opposing dental model base quadrant
US7690919B2 (en) 2006-03-28 2010-04-06 Huffman Ronald E Dental articulator

Similar Documents

Publication Publication Date Title
US3423831A (en) Composite artificial tooth
Tuntiprawon et al. The effect of cement thickness on the fracture strength of all‐ceramic crowns
US4321042A (en) Ceramic dental implant
US5213498A (en) Method for making a custom impression tray
US3502466A (en) Manufacture of articles from powdered metals
US5501600A (en) Method of laminating a porcelain veneer to a tooth
US6627327B2 (en) Dental mill blank and support stub assembly
Silver et al. An evaluation and comparison of porcelains fused to cast metals
US5775912A (en) Method of producing a dental restoration using CAD/CAM
US5591030A (en) Dental ceramic restoration using a multi-layered structure
Milot et al. Root fracture in endodontically treated teeth related to post selection and crown design
US5910273A (en) Process for manufacturing dental prosthetics based on ceramics
Touati et al. Second generation laboratory composite resins for indirect restorations
US5308243A (en) Method and compositions for producing life-like dental porcelain restorations and dental porcelain restorations so produced
US5713994A (en) Low-fusing temperature porcelain, compositions, prostheses, methods and kits
US674419A (en) Root-canal filling for teeth.
Blatz Long-term clinical success of all-ceramic posterior restorations.
US2194790A (en) Artificial tooth and crown of tooth
Koutayas et al. All-ceramic posts and cores: the state of the art.
Pettenò et al. Comparison of marginal fit of 3 different metal-ceramic systems: an in vitro study.
US4742861A (en) Method and material for dental structures
US4878840A (en) Orthodontic appliance
US4216583A (en) Orthodontic appliance
US4380435A (en) Permanent one visit bonded bridge no drilling, and kit therefor
Prö Compressive strength of two modern all-ceramic crowns.

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 8

REMI Maintenance fee reminder mailed
FPAY Fee payment

Year of fee payment: 12

SULP Surcharge for late payment