US5224049A — Method, system and mold assembly for use in prepa…

Claim 1

Independent Claim 162 words

A method for use in preparing a dental prosthesis, comprising the steps of: providing an electrical signal encoding geometric specifications of a substructure of the prosthesis, said specifications including dimensions and shape of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of said substructure; in response to said electrical signal, providing a first mold component having a surface at least approximately conforming to said tooth preparation and a second mold component to produce, in cooperation with said first mold component, a mold cavity having dimensions and configuration corresponding at least substantially to dimensions and configuration of said substructure; placing said first mold component and said second mold component in predetermined relative positions to form said mold cavity; introducing into said mold cavity a quantity of a fluidic solidifiable dental material; and removing a prosthesis substructure form from said mold cavity upon solidification of the dental material with which said mold cavity is filled.

Claim 2

Independent Claim 162 words

A method for use in preparing a dental prosthesis, comprising the steps of: providing an electrical signal encoding geometric specifications of a substructure of the prosthesis, said specifications including dimensions and shape of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of said substructure; in response to said electrical signal, providing a first mold component having a surface at least approximately conforming to said tooth preparation and a second mold component to produce, in cooperation with said first mold component, a mold cavity having dimensions and configuration corresponding at least substantially to dimensions and configuration of said substructure; placing said first mold component and said second mold component in predetermined relative positions to form said mold cavity; introducing into said mold cavity a quantity of a fluidic solidifiable dental material; and removing a prosthesis substructure form from said mold cavity upon solidification of the dental material with which said mold cavity is filled.

Claim 3

Dependent Claim 76 words

The method defined in claim 1 wherein said step of introducing comprises the step of filling one of said first mold component and said second mold component with said fluidic solidifiable dental material prior to said step of placing, said step of placing comprising the step of at least partially inserting the other of said first mold component and said second mold component into said one of said first mold component and said second mold component.

Claim 4

Dependent Claim 87 words

The method defined in claim 1 wherein said fluidic solidifiable dental material comprises a semisolid deformable mass, said step of placing comprising the steps of positioning said first mold component and said second mold component on opposite sides of deformable mass and subsequently moving said first mold component and said second mold component towards one another, said step of introducing comprising the step of shearing off a portion of said deformable mass by said first mold component and said second mold component during said step of moving.

Claim 5

Dependent Claim 93 words

The method defined in claim 1 wherein said fluidic solidifiable dental material takes the form of a molded blank, said step of placing comprising the steps of positioning said first mold component, said second mold component and said blank so that said first mold component and said second mold component are disposed on opposite sides of said blank and subsequently moving said first mold component and said second mold component towards one another, said step of introducing comprising the step of seating said blank into said mold cavity during said step of moving.

Claim 6

Dependent Claim 17 words

The method defined in claim 4 wherein said blank has a shape substantially conforming to said specifications.

Claim 7

Dependent Claim 40 words

The method defined in claim 1 wherein said step of providing includes the step of operating a computer to select said first mold component and said second mold component from a plurality of mold preforms in accordance with said specifications.

Claim 8

Dependent Claim 19 words

The method defined in claim 1 wherein said step of introducing is performed subsequently to said step of placing.

Claim 9

Dependent Claim 33 words

The method defined in claim 7 wherein said step of introducing includes a step of injecting said fluidic solidifiable dental material into said mold cavity upon formation thereof during said step of placing.

Claim 10

Dependent Claim 20 words

The method defined in claim 1 wherein said step of introducing is performed in part during said step of placing.

Claim 11

Dependent Claim 78 words

The method defined in claim 9 wherein said step of introducing comprises the steps of pouring said fluidic solidifiable dental material into a mold form including one of said first mold component and said second mold component and subsequently shifting the other of said first mold component and said second mold component relatively towards said one of said first mold component and said second mold component to form said mold cavity filled with said fluidic solidifiable dental material.

Claim 12

Dependent Claim 25 words

The method defined in claim 1, further comprising the step of selectively removing material from said first mold component prior to said step of placing.

Claim 13

Dependent Claim 21 words

The method defined in claim 11 wherein said step of selectively removing is performed automatically in response to said electrical signal.

Claim 14

Dependent Claim 28 words

The method defined in claim 11 wherein said step of selectively removing comprises at least one of electro-eroding and ultrasonically treating the material of said first mold component.

Claim 15

Dependent Claim 25 words

The method defined in claim 1, further comprising the step of selectively removing material from said second mold component prior to said step of placing.

Claim 16

Dependent Claim 21 words

The method defined in claim 14 wherein said step of selectively removing is performed automatically in response to said electrical signal.

Claim 17

Dependent Claim 28 words

The method defined in claim 14 wherein said step of selectively removing comprises at least one of electro-eroding and ultrasonically treating the material of said second mold component.

Claim 18

Dependent Claim 16 words

The method defined in claim 1 wherein said steps of placing and introducing are performed automatically.

Claim 19

Dependent Claim 84 words

The method defined in claim 17 wherein said steps of placing and introducing comprise the steps of operating a computer to control a robotic device to (a) place said first mold component and said second mold component in relative positions to form said mold cavity and (b) introduce into said mold cavity a quantity of a fluidic solidifiable dental material, said computer selecting said relative positions in accordance with information included in said electrical signal defining said relative positions based on a patient's dentition.

Claim 20

Dependent Claim 39 words

The method defined in claim 1 wherein said step of placing comprises the steps of attaching said first mold component and said second mold component to respective mold supports and then positioning said mold supports relative to one another.

Claim 21

Dependent Claim 69 words

The method defined in claim 19 wherein one of said mold supports comprises a plate member provided with an array of predetermined positions for receiving said first mold component, the other of said mold supports comprising a plate member provided with an array of positions for receiving said second mold component, said positions being determined in part in accordance with information obtained from a scan of a patient's dentition.

Claim 22

Dependent Claim 30 words

The method defined in claim 19 wherein said first mold component and said second mold component are each provided with a pin insertable into apertures in the respective mold support.

Claim 23

Dependent Claim 43 words

The method defined in claim 1 wherein said first mold component and said second mold component are provided with a plurality of mounting pins, further comprising the step of machining apertures for receiving said mounting pins in a pair of mold support members.

Claim 24

Dependent Claim 22 words

The method defined in claim 1 wherein said step of providing an electrical signal comprises the step of receiving said electrical signal.

Claim 25

Dependent Claim 16 words

The method defined in claim 23 wherein said electrical signal is transmitted via a telecommunications linkage.

Claim 26

Dependent Claim 17 words

The method defined in claim 23 wherein said electrical signal is communicated via a transported memory element.

Claim 27

Dependent Claim 14 words

The method defined in claim 25 wherein said memory element is a floppy disk.

Claim 28

Dependent Claim 17 words

The method defined in claim 1 wherein said fluidic solidifiable dental material is a deformable metallic composition.

Claim 29

Dependent Claim 34 words

The method defined in claim 1 wherein said fluidic solidifiable dental material is taken from the group including a deformable plastic substance, a glass material, a ceramic material, a composite glass and ceramic material.

Claim 30

Dependent Claim 18 words

The method defined in claim 1 wherein said second mold component includes a mold body and an insert.

Claim 31

Dependent Claim 23 words

The method defined in claim 29, further comprising the step of selectively removing material from said insert prior to said step of placing.

Claim 32

Dependent Claim 21 words

The method defined in claim 30 wherein said step of selectively removing is performed automatically in response to said electrical signal.

Claim 33

Dependent Claim 18 words

The method defined in claim 1 wherein said first mold component includes a mold body and an insert.

Claim 34

Dependent Claim 23 words

The method defined in claim 32, further comprising the step of selectively removing material from said insert prior to said step of placing.

Claim 35

Dependent Claim 21 words

The method defined in claim 33 wherein said step of selectively removing is performed automatically in response to said electrical signal.

Claim 36

Dependent Claim 33 words

The method defined in claim 1 wherein said tooth preparation takes a post-like form and wherein said first mold component includes a body with a base and a ring-shaped portion at said base.

Claim 37

Dependent Claim 19 words

The method defined in claim 35 wherein said ring-shaped portion is a separate piece attached to said body portion.

Claim 38

Dependent Claim 35 words

The method defined in claim 36, further comprising the step of selectively removing material from said ring-shaped portion along an inner surface thereof to form with said body a skirt region of said mold cavity.

Claim 39

Dependent Claim 15 words

The method defined in claim 1 wherein the prosthesis takes the form of an overlay.

Claim 40

Dependent Claim 12 words

The method defined in claim 38 wherein the prosthesis is a crown.

Claim 41

Dependent Claim 12 words

The method defined in claim 38 wherein the prosthesis is a bridge.

Claim 42

Dependent Claim 75 words

The method defined in claim 1, further comprising the steps of positioning a plurality of third mold components in a predetermined array determined in accordance with information contained in said electrical signal, positioning a plurality of fourth mold components in a corresponding array determined in accordance with information contained in said electrical signal, said first mold component constituting one of said third mold components, said second mold component constituting one of said fourth mold components.

Claim 43

Dependent Claim 45 words

The method defined in claim 41 wherein said steps of positioning comprise the steps of placing said third mold components in said predetermined array on a first mold support and of placing said fourth mold components in said corresponding array on a second mold support.

Claim 44

Dependent Claim 54 words

The method defined in claim 41 wherein said step of positioning a plurality of fourth mold components comprises the steps of selecting a mold support provided with a plurality of mold parts in said corresponding array, selecting at least one insert piece, and inserting said insert piece in one of said fourth mold components.

Claim 45

Dependent Claim 60 words

The method defined in claim 41, further comprising the step of selectively removing material from at least two of said fourth mold components to form a bridging portion between said two of said fourth mold components upon a filling of a mold cavity formed between said two of said fourth mold components and associated ones of said third mold components.

Claim 46

Dependent Claim 132 words

The method defined in claim 1, further comprising the steps of: separating said second mold portion from said first mold portion and said prosthesis substructure form upon solidification of said fluidic solidifiable dental material and prior to said step of removing; providing a third mold component having an inner surface substantially conforming to an outer surface of the prosthesis, as specified in said electrical signal; placing said first mold component with the attached prosthesis substructure form and said third mold component in predetermined relative positions to form an additional mold cavity; introducing into said mold cavity a quantity of another fluidic solidifiable dental material; and removing a substantially complete prosthesis form from said mold cavity upon solidification of the other fluidic solidifiable dental material with which said additional mold cavity is filled.

Claim 47

Independent Claim 141 words

A system for use in preparing a dental prosthesis, comprising: signal production means for producing an electrical signal encoding geometric specifications of a substructure of the prosthesis, said specifications including dimensions and shape of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of the substructure; robot means for placing a first mold component and a second mold component, selected in accordance with said electrical signal, in predetermined relative positions to form a mold cavity, said first mold component corresponding in shape and dimensions to said tooth preparation; filling means for introducing into said mold cavity a quantity of a fluidic solidifiable dental material; and computing means operatively connected to said receiver means, said robot means and said filling means for controlling and sequencing the operation thereof in response to said electrical signal.

Claim 48

Independent Claim 141 words

A system for use in preparing a dental prosthesis, comprising: signal production means for producing an electrical signal encoding geometric specifications of a substructure of the prosthesis, said specifications including dimensions and shape of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of the substructure; robot means for placing a first mold component and a second mold component, selected in accordance with said electrical signal, in predetermined relative positions to form a mold cavity, said first mold component corresponding in shape and dimensions to said tooth preparation; filling means for introducing into said mold cavity a quantity of a fluidic solidifiable dental material; and computing means operatively connected to said receiver means, said robot means and said filling means for controlling and sequencing the operation thereof in response to said electrical signal.

Claim 49

Dependent Claim 58 words

The system defined in claim 46, further comprising material removal means operatively connected to said computing means for selectively removing material, in response to signals from said omputing means, from at least one of said first mold component and said second mold component prior to placement of said second mold component into juxtaposition to said first mold component.

Claim 50

Dependent Claim 25 words

The ssytem defined in claim 47 wherein said material removal means includes means for removing material by at least one of electro-erosion and ultrasonic removal.

Claim 51

Dependent Claim 29 words

The system defined in claim 46 wherein said signal producing means includes receiver means for receiving said electrical signal and reproducing said signal for use by said computing means.

Claim 52

Independent Claim 131 words

A method for manufacturing a customized dental rosthesis, comprising the steps of: generating electrically encoded data representing a three-dimensional surface of a tooth to be restored, said step of generating including the steps of (a) tracing a contour of said three-dimensional surfaces with a stylus-type instrument provided with an extension disposed outside of he mouth in which said tooth is located and (b) optically monitoring movements of a predetermined point on said extension; automatically feeding said data to a first computer; operating said computer to generate an electrical signal encoding specifications of a substructure of the prosthesis, said specifications including dimensions of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of the substructure; and transmitting said electrical signal to a second computer.

Claim 53

Independent Claim 131 words

A method for manufacturing a customized dental rosthesis, comprising the steps of: generating electrically encoded data representing a three-dimensional surface of a tooth to be restored, said step of generating including the steps of (a) tracing a contour of said three-dimensional surfaces with a stylus-type instrument provided with an extension disposed outside of he mouth in which said tooth is located and (b) optically monitoring movements of a predetermined point on said extension; automatically feeding said data to a first computer; operating said computer to generate an electrical signal encoding specifications of a substructure of the prosthesis, said specifications including dimensions of a tooth preparation at a dental site at which the prosthesis is to be affixed and configuration of the substructure; and transmitting said electrical signal to a second computer.

Claim 54

Dependent Claim 20 words

The method defined in claim 50 wherein said step of generating includes the step of optically scanning said three-dimensional surface.

Claim 55

Dependent Claim 38 words

The method defined in claim 51, further comprising the step of preparing said tooth to form said tooth preparation, said three-dimensional surface being a surface of said tooth preparation, said dimensions being actual dimensions of said tooth preparation.

Claim 56

Dependent Claim 28 words

The method defined in claim 51, further comprising the step of operating said first computer to calculate said dimensions, said dimensions being projected dimensions of said tooth preparation.

Claim 57

Dependent Claim 34 words

The method defined in claim 53 said step of operating said first computer to calculate includes the step of providing input to said first computer to designate dimensions and location of said tooth preparation.

Claim 58

Dependent Claim 17 words

The method defined in claim 54 wherein said step of providing input is implemented with a keyboard,

Claim 59

Dependent Claim 18 words

The method defined in claim 54 wherein said step of providing input is implemented with a mouse-type device.

Claim 60

Dependent Claim 42 words

The method defined in claim 50 wherein said step of operating said first computer to generate includes the step of computing a varying thickness dimension of said substructure so that a porcelain portion of the prosthesis has a substantially constant thickness throughout.

Claim 61

Dependent Claim 31 words

The method defined in claim 50 further comprising the step of operating said second computer to automatically control a robotic device to produce said substructure in response to said electrical signal.

Claim 62

Dependent Claim 98 words

The method defined in claim 58, further comprising the steps of controlling said robotic device via said second computer to (a) select a first mold component corresponding in dimensions to said tooth preparation, (b) select a second mold component to produce, in cooperation with said first mold component, a mold cavity having dimensions and configuration corresponding to dimensions and configuration of said substructure, (c) place said first mold component and said second mold component in predetermined relative positions to form said mold cavity and (d) fill said mold cavity with a quantity of a fluidic solidifiable dental material.

Claim 63

Dependent Claim 23 words

The method defined in claim 50 wherein said first computer and said second computer are disposed at respective locations remote from one another.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-06-28	1996-12-28	1997-06-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-06-28	2000-12-28	2001-06-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-06-28	2004-12-28	2005-06-29	$7700.00	Window Closed / Lapsed

Method, system and mold assembly for use in preparing a dental prosthesis

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