CA1178007A - Base for dental model - Google Patents
Base for dental modelInfo
- Publication number
- CA1178007A CA1178007A CA000445685A CA445685A CA1178007A CA 1178007 A CA1178007 A CA 1178007A CA 000445685 A CA000445685 A CA 000445685A CA 445685 A CA445685 A CA 445685A CA 1178007 A CA1178007 A CA 1178007A
- Authority
- CA
- Canada
- Prior art keywords
- base
- platform
- die
- mold
- stone
- 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
Links
Abstract
ABSTRACT
A base for use in a dental model to support the bottom surface of a tooth die comprising in combination a body and a platform. The platform extends upwardly from the body to support the tooth die and the die supporting surface, being planar, is laterally dimensioned to conform generally with the bottom surface of the tooth die.
A base for use in a dental model to support the bottom surface of a tooth die comprising in combination a body and a platform. The platform extends upwardly from the body to support the tooth die and the die supporting surface, being planar, is laterally dimensioned to conform generally with the bottom surface of the tooth die.
Description
(3~
This application is a division of application Serial No. 395,273 filed 1 February, 1982.
The present invention relates to dental models and, more particularly, to molds and methods for using same to form the base of a dental model.
To accura-tely form and position false teeth or caps, a dentist normally makes a negative impression of the affected tooth or teeth. The negative impression may be partial, unilateral or bilateral, depending upon the extent of work to be done; the impression serves as a mold for developiny a die of the patient's teeth. The negative impression is obtained by partially filling a tray with thermoplastic material. The filled tray is inserted within the patient's mouth such that the teeth and adjacent gums sink into and create a cavi-ty within thermoplastic material. Shortly thereafter, the thermoplastic material will cure and retain an exact impression of the patient's teeth and adjacent gums. This is an essentially standard technique presently used by most dentists.
To form the die, a pourable casting stone, known as "pink stone" is poured into the negative impression up to at least the "margin" or base of the tooth. As described in more detail in United States Patent No. 3,937,773, assigned to the present assignee, after the pink stone has been compacted to preclude voids and remove any air bubbles, a retainer and included guide pins is placed upon the surface of the pink stone such that the extending spade ends of the pins are sunk into the pink stone below the margin. Preferably, -the degree of extension of the pins is such that the surface of the retainer rests upon the surface of the pink stone. After the pink stone is at least partially cured, wax or similar lubricant is swathed upon the surface of the pink stone.
._....
l Presently, the base for the dental mold is made
This application is a division of application Serial No. 395,273 filed 1 February, 1982.
The present invention relates to dental models and, more particularly, to molds and methods for using same to form the base of a dental model.
To accura-tely form and position false teeth or caps, a dentist normally makes a negative impression of the affected tooth or teeth. The negative impression may be partial, unilateral or bilateral, depending upon the extent of work to be done; the impression serves as a mold for developiny a die of the patient's teeth. The negative impression is obtained by partially filling a tray with thermoplastic material. The filled tray is inserted within the patient's mouth such that the teeth and adjacent gums sink into and create a cavi-ty within thermoplastic material. Shortly thereafter, the thermoplastic material will cure and retain an exact impression of the patient's teeth and adjacent gums. This is an essentially standard technique presently used by most dentists.
To form the die, a pourable casting stone, known as "pink stone" is poured into the negative impression up to at least the "margin" or base of the tooth. As described in more detail in United States Patent No. 3,937,773, assigned to the present assignee, after the pink stone has been compacted to preclude voids and remove any air bubbles, a retainer and included guide pins is placed upon the surface of the pink stone such that the extending spade ends of the pins are sunk into the pink stone below the margin. Preferably, -the degree of extension of the pins is such that the surface of the retainer rests upon the surface of the pink stone. After the pink stone is at least partially cured, wax or similar lubricant is swathed upon the surface of the pink stone.
._....
l Presently, the base for the dental mold is made
2 by one of two ~1ethods. First, additlonal pourable hardenab1e
3 stone, generally referred to as "yellow stone", is poured ~ithin-
4 the negative impression to cover the pink stone and the retainer with sufficient depth of yellow stone to for~ a solid base. After , 6 both the pink and ihe yellow stone have hardened, the tray and 7 supported thermoplastic material is peeled away to leave a 8 ¦ conventional dental model. Alternatively, a patty of yellow 9 ¦ stone is for~ed upon a glass or other smooth surface. The lO ¦ partially or completely cured pink stone is placed thereupon such ll ¦ that the retainer extends into and is encapsulated by the 12 ¦ yellow stone.
14 ¦ - Either of the presently used methods for making the 15 base of yellow stone requires substantial technician time to 16 manually form the yellow stone into an initial shapé. After 17 it is cured, further time is required for cutting and grinding 18 away excess yellow stone material. -The time spent and material l9 wasted necessarily adds to the cost of the dental model to the ultimate detriment of the patient.
~? ¦ In the presently used dental models, the mesial and 23 ¦ distal Cl1ts to be made throush the line of demarcation between 24 ¦ the pink and yellow stone must be made at an angle with respect 25 ¦ to horizontal or the base surface in oraer to provide sufficient 26 ¦ ciearance for the sa~ end. ~he depth of cut necessitated by 2'7l tl~e cu'tiny dngle-~ tends to weaken the structural integrity of 28 1 the base resul~ing in either moxe fragile bases or bases which 29 1, have to be substantially more thick than other~ise necessary ~ li to accoinrci~.Jt such ~eakening ~ithout brea};age auring normal .iLIl han~lin~3 3Z 1l ~ither of the above processes for raking tr.e bases ,j ', ~1~7~31)V~7 of dental models tends to result in each base being somewhat unique and individualized. When the dental models are placed upon a dental articulator to perform work thereon, a substantial amount of time and expertise is necessary to properly attach and align the upper and lower coacting dental models to reproduce the relationship of the patient's jaws. The requisite time for aligning the dental models is exacerbated by the non-uniformity of the dental model base configurations and thicknesses and requires yet further time and effort to positionally orient each base upon its respective arm of the articulator and to attach the base to the arm.
In accordance with the present invention there is provided a base for use in a dental model to suppor-t the bottom surface of a tooth die. The base comprises in combina-tion:
(a) a body; and (b) a platform extending upwardly from the body for supporting the die above the body, the platform including a planar die supporting surface laterally dimensioned to conform generally with the bottom surface of the tooth die.
The base preferably includes a perimeter wall common to the base and a part of the platform perimeter and an inset defined by an upwardly extending wall common with the remaining perimeter of the platform. The inset may include a downwardly extending wall common with the perimeter wall. The platform may be commensurate with a bilateral tooth die. Similarly, the platform may be commensurate with a unilateral tooth die.
For convenience the subject matter of both the pre-sent invention and the parent application Serial No. 395,273 filed 1 February, 1982 (and another divisional application associated therewith) is described together, by way of example only with reference to the following drawings in which:
Figure 1 is an isometric view of a mold for making right or left quadrant bases for dental models;
Figure 2 is a cross-sectional view taken along lines 2-2, as shown in Figure l;
Figure 3 is an expanded view of the components shows in Figure l;
1 Figure 4 is an isometric view of the ~ottcm surface 2 formed through use of the mold sho~m in Figure l;
3 .
4 . Figure 5 illustrates a reversably mountable element
14 ¦ - Either of the presently used methods for making the 15 base of yellow stone requires substantial technician time to 16 manually form the yellow stone into an initial shapé. After 17 it is cured, further time is required for cutting and grinding 18 away excess yellow stone material. -The time spent and material l9 wasted necessarily adds to the cost of the dental model to the ultimate detriment of the patient.
~? ¦ In the presently used dental models, the mesial and 23 ¦ distal Cl1ts to be made throush the line of demarcation between 24 ¦ the pink and yellow stone must be made at an angle with respect 25 ¦ to horizontal or the base surface in oraer to provide sufficient 26 ¦ ciearance for the sa~ end. ~he depth of cut necessitated by 2'7l tl~e cu'tiny dngle-~ tends to weaken the structural integrity of 28 1 the base resul~ing in either moxe fragile bases or bases which 29 1, have to be substantially more thick than other~ise necessary ~ li to accoinrci~.Jt such ~eakening ~ithout brea};age auring normal .iLIl han~lin~3 3Z 1l ~ither of the above processes for raking tr.e bases ,j ', ~1~7~31)V~7 of dental models tends to result in each base being somewhat unique and individualized. When the dental models are placed upon a dental articulator to perform work thereon, a substantial amount of time and expertise is necessary to properly attach and align the upper and lower coacting dental models to reproduce the relationship of the patient's jaws. The requisite time for aligning the dental models is exacerbated by the non-uniformity of the dental model base configurations and thicknesses and requires yet further time and effort to positionally orient each base upon its respective arm of the articulator and to attach the base to the arm.
In accordance with the present invention there is provided a base for use in a dental model to suppor-t the bottom surface of a tooth die. The base comprises in combina-tion:
(a) a body; and (b) a platform extending upwardly from the body for supporting the die above the body, the platform including a planar die supporting surface laterally dimensioned to conform generally with the bottom surface of the tooth die.
The base preferably includes a perimeter wall common to the base and a part of the platform perimeter and an inset defined by an upwardly extending wall common with the remaining perimeter of the platform. The inset may include a downwardly extending wall common with the perimeter wall. The platform may be commensurate with a bilateral tooth die. Similarly, the platform may be commensurate with a unilateral tooth die.
For convenience the subject matter of both the pre-sent invention and the parent application Serial No. 395,273 filed 1 February, 1982 (and another divisional application associated therewith) is described together, by way of example only with reference to the following drawings in which:
Figure 1 is an isometric view of a mold for making right or left quadrant bases for dental models;
Figure 2 is a cross-sectional view taken along lines 2-2, as shown in Figure l;
Figure 3 is an expanded view of the components shows in Figure l;
1 Figure 4 is an isometric view of the ~ottcm surface 2 formed through use of the mold sho~m in Figure l;
3 .
4 . Figure 5 illustrates a reversably mountable element
5 ¦ for makirg right or left ~uadrant bases;
6 . - .
7 Figure 6 illustrates apparatus for forming a flexi~le
8 mold to make the base of a dental ~lodel;
10 ¦ Figure 7 is an exploded view of the apparatus shown 11 in Figure 6;
13 ¦ Figure 8 illustrates an insert for the apparatus shown 14 ¦ in Figure 6;
15 I . :
16 ¦ Figure 9 illustrates the flexible mold formed by the 17 ~ apparatus shown in Figure 8;
19 ¦ Figure 10 is a cross-sectional view taken along lines 10-10, as shown in Figure 9;
21 .
22 Figure 11 is an isometric view illustrating the dental 23 moael formed;
2~ 1 25 ¦ Figure 12 is a cross-sectional view of a dental model 26 ¦ formed;
28 ,¦ Figure 13 illustrates apparatus for rorming a mold 29 1~ to maXe a unila~eral ~ase of a dental model~ I
30 ~
31 Figure 14 is a cross-sectional view taken along 32 li lir,es ]4-14, as shG~7n i.n Figure 13;
1,1 . . I
l ~ ~78 1 ~ Figure 15 is a top view of the apparatus shown in 2 Figure 13; . - ¦
4 Figure 1~ is a cross-sectional view taken along lines 16-16, as shown in Figure 15; and 6 . ' - , 7 - Figure 17 illustrates a flexible mold formed by 8 the apparatus shown in Figure 13 and the dental model made
10 ¦ Figure 7 is an exploded view of the apparatus shown 11 in Figure 6;
13 ¦ Figure 8 illustrates an insert for the apparatus shown 14 ¦ in Figure 6;
15 I . :
16 ¦ Figure 9 illustrates the flexible mold formed by the 17 ~ apparatus shown in Figure 8;
19 ¦ Figure 10 is a cross-sectional view taken along lines 10-10, as shown in Figure 9;
21 .
22 Figure 11 is an isometric view illustrating the dental 23 moael formed;
2~ 1 25 ¦ Figure 12 is a cross-sectional view of a dental model 26 ¦ formed;
28 ,¦ Figure 13 illustrates apparatus for rorming a mold 29 1~ to maXe a unila~eral ~ase of a dental model~ I
30 ~
31 Figure 14 is a cross-sectional view taken along 32 li lir,es ]4-14, as shG~7n i.n Figure 13;
1,1 . . I
l ~ ~78 1 ~ Figure 15 is a top view of the apparatus shown in 2 Figure 13; . - ¦
4 Figure 1~ is a cross-sectional view taken along lines 16-16, as shown in Figure 15; and 6 . ' - , 7 - Figure 17 illustrates a flexible mold formed by 8 the apparatus shown in Figure 13 and the dental model made
9 ¦ therefrom.
11 Referring to Figure 1, there is sho~m a disasse~lable 12 mold 10 for making a right or left ~uadrant base 12 of a 13 dental model 14 having a-die 16 attached thereto. The mold 1 includes a substructure 18 from which extend guide means, such 16 as opposed channels 20, 22, a removable reversible insert 24 and ~a removable perimeter defining means such as ~all 26 detachably 17 attachable to ~he insert.
19 - The components of mold 10 and their mutual cooperation will be. described with joint reference to Figures 1-5. .Normally, ¦
2 dental models,must be located upon a dental articulator in order for a dentist or lab technician to perform work thereon and 23 construct whatever prosthetic devices may be required to cure or alleviate a patient's dental problem. To standardize the 25 I attachment location and orientat~cn of the dental model, indexing .
25 I me2ns r such as dcp,essions Z8, are formed in bottom surfQce 30 I, 27 of base 12 by nipples 29 extendin~ upwardly from the surface o 28 substructure 18. ~hereby, each base formed by mold 10 ~ill have a 29 uniforml.y posi.tioned indexing means for cooperative en~agement 30 1 ~ith complementary indexin~ means permanently attached to an arm 31 1 of an articulator. To avoid ~he need for mastic or other 32 ¦1 ~dhesive suhstances presently used to maintain a dental model ,j _ 7 _ Il 11'7~ 7 - I
1 1 attached to the arm of an articulator, a magnet 32 is formed as 2 part of the bottom of base 12. 'The magnet cooperates with a 3 ~ commensurately located metal plate upon an arm of the ¦ articulator. Alternatively, the locations of the magnet and 5 ¦ plate mav be reversed. Thereby, the dental model is maintained 6 ~ in engagement with the arm of an articulator by magnet 32 and 7 ¦ indexed with respect thereto by means of depressions 28. The 8 ¦ location of magnet 32 in base 12 is predetermined by delineation 3 9 or similar physical key means upon the surface of substructure 18.
11 Referring to Figure 1, there is sho~m a disasse~lable 12 mold 10 for making a right or left ~uadrant base 12 of a 13 dental model 14 having a-die 16 attached thereto. The mold 1 includes a substructure 18 from which extend guide means, such 16 as opposed channels 20, 22, a removable reversible insert 24 and ~a removable perimeter defining means such as ~all 26 detachably 17 attachable to ~he insert.
19 - The components of mold 10 and their mutual cooperation will be. described with joint reference to Figures 1-5. .Normally, ¦
2 dental models,must be located upon a dental articulator in order for a dentist or lab technician to perform work thereon and 23 construct whatever prosthetic devices may be required to cure or alleviate a patient's dental problem. To standardize the 25 I attachment location and orientat~cn of the dental model, indexing .
25 I me2ns r such as dcp,essions Z8, are formed in bottom surfQce 30 I, 27 of base 12 by nipples 29 extendin~ upwardly from the surface o 28 substructure 18. ~hereby, each base formed by mold 10 ~ill have a 29 uniforml.y posi.tioned indexing means for cooperative en~agement 30 1 ~ith complementary indexin~ means permanently attached to an arm 31 1 of an articulator. To avoid ~he need for mastic or other 32 ¦1 ~dhesive suhstances presently used to maintain a dental model ,j _ 7 _ Il 11'7~ 7 - I
1 1 attached to the arm of an articulator, a magnet 32 is formed as 2 part of the bottom of base 12. 'The magnet cooperates with a 3 ~ commensurately located metal plate upon an arm of the ¦ articulator. Alternatively, the locations of the magnet and 5 ¦ plate mav be reversed. Thereby, the dental model is maintained 6 ~ in engagement with the arm of an articulator by magnet 32 and 7 ¦ indexed with respect thereto by means of depressions 28. The 8 ¦ location of magnet 32 in base 12 is predetermined by delineation 3 9 or similar physical key means upon the surface of substructure 18.
10 .
11 ¦ Insert 24 slidably cooperates with channels 20 and 22 to
12 ¦ removably locate the insert upon substructure 18. The insert
13 ~ includes a wall 36 of which lower wall 38 defines a part or the
14 ¦ perimeter of base 12. A plate 40 extends laterally from wall 36
15 ¦ and defines a vold iD the base to be formed. The configuration
16 of wall 36 and the location of plate 40 thereon is such that the ¦ insert may be brought into slidable engagment with channels 20 18 ¦ ana 22 to reorient the plate from right to left and vice versa ¦ whereby the void formed may be reversed in position with respect to base 12.
22 ¦ Wall 26 includes ends 42 and 44, which ends are slidably 23 ¦ enaagable with slots 46, 48 disposed in wall 36. The interior 24 surface of wall 26 defines the perimeter wall of base i2. It may be noted that curved wall 50 of plate 40 is commensurate in 26 ! curvature iith the interior surface of ~lall 26 and is located 27 1 adjacent thereto upon assembly.
29 'I o ~orm base 12 in mold 10, a magnet 32 is placed îthin de]ineations 3~. Insert 2~ is seated ~Jithin c~annels 20 and ,¦ Z2 ;~hereafter ~,/all 26 is brought into retaining engagement ~ith res~ect;ve ones of slot.s 46 and 48. Yello~,~ ston~ is pour-ed into Il .
li~7~G~(37 1 ¦ the resulting cavity. The yellow stone wlll flow beneath 2 ¦ plate 40, as illustrated in Figure 2, around and about magnet 32 3 ¦ and up to a le~rel coincident with the top of wall 26 and the top 4 ¦ surface of plate 40. A screed or the like may be employed to 5 ¦ obtain a level top surface of the yellow stone. Before the yellow stone sets, a tooth die 16, having a plurality of 7 ¦ do~7els or pins 17 depending therefrom is placed upon the uncured 8 ex~osed surface of the ~ase. Preferably, the extending part of 9 pins 17 is commensurate in length with the thickness of base 12, as shown in Figure 2. Aftex curing, wall- 26 and insert 24 are 11 disassembled and the base may be lifted off substructure 18.
12 The resulting base will have a platform 13 which platform 13 supports die 16 in either a right or left quadrant, depending 14 upon the orientation of insert 24.
15 - ; ~
16 - To sever a model tooth 54 ~see Figure 3J mesial and
22 ¦ Wall 26 includes ends 42 and 44, which ends are slidably 23 ¦ enaagable with slots 46, 48 disposed in wall 36. The interior 24 surface of wall 26 defines the perimeter wall of base i2. It may be noted that curved wall 50 of plate 40 is commensurate in 26 ! curvature iith the interior surface of ~lall 26 and is located 27 1 adjacent thereto upon assembly.
29 'I o ~orm base 12 in mold 10, a magnet 32 is placed îthin de]ineations 3~. Insert 2~ is seated ~Jithin c~annels 20 and ,¦ Z2 ;~hereafter ~,/all 26 is brought into retaining engagement ~ith res~ect;ve ones of slot.s 46 and 48. Yello~,~ ston~ is pour-ed into Il .
li~7~G~(37 1 ¦ the resulting cavity. The yellow stone wlll flow beneath 2 ¦ plate 40, as illustrated in Figure 2, around and about magnet 32 3 ¦ and up to a le~rel coincident with the top of wall 26 and the top 4 ¦ surface of plate 40. A screed or the like may be employed to 5 ¦ obtain a level top surface of the yellow stone. Before the yellow stone sets, a tooth die 16, having a plurality of 7 ¦ do~7els or pins 17 depending therefrom is placed upon the uncured 8 ex~osed surface of the ~ase. Preferably, the extending part of 9 pins 17 is commensurate in length with the thickness of base 12, as shown in Figure 2. Aftex curing, wall- 26 and insert 24 are 11 disassembled and the base may be lifted off substructure 18.
12 The resulting base will have a platform 13 which platform 13 supports die 16 in either a right or left quadrant, depending 14 upon the orientation of insert 24.
15 - ; ~
16 - To sever a model tooth 54 ~see Figure 3J mesial and
17 distal saw cuts 56, 58 are made through die 1~ to a point just
18 below the line of demarcation ~0. Further depth of cut is
19 unnecessary as platform 13 raises the saw blade sufficiently above the remaining part of the base to prevent interference ~7ith the 21 end of the saw blade ~see Figure 12). As pointed out above, in presently made dental models, the saw cut has to be made at ~3 a substantial angle to accommodate the sa~7 b]ade end. An indent ~ 1 24 may be formed in the bottom surface 30 to aid in pushlng upon 26 ¦ pins 17 to remove a r,odel tooth.
27 ¦~ sase 12, ~hen removed from ~7ithin moId 10, i-s of a 28 1I minimum perim~ter co-~mensurate with the sides of die 16. It is ~9 ll smooth surfaced as a resu]t of the surface smoothness of the ~li various components of the mold and is ready for use ~ithout 31 i~ further finishin~ by technicians. Additionally, the die is 32 , inde~ed and includes means for adhering it to the arm of an _ g _ 0~
l articulator ~ithout further work by technicians. It is to 2 be noted, that magnet 32 may bé replaced by a steel plate or 3 l the like which will be magnetically coupled to a magnet 4 located in the arm of the articulator.
5 l 6 ~ - Referring jointly to Yigures 6-12 there is shown apparatus ~2 ~or constructing a flexible mold 80 for a base 90 8 ¦ of a dental model. The apparatus includes a substructure 64 9 ¦ supporting a cast 6~. The cast has a void 68 extending through lO ¦ the cast and commensurate in planform with the configuration of ll ¦ the exterior dimensions of mold 80 to be forrned. An insert 70, 12 ¦ representative of the e~act configuration of base 90 to be 13 ¦ developed ~rom the mold produced by apparatus 62, is attache~
14 ¦ to platform 64 by bolts or other méchanical means and located 15 ¦ generally central to void 68. Bottom surface 72 of the insert 16 ¦ includes depressions 74 for forming nipples ln the mold, 17 which nipples when reproduced by the base to be molded serve as 18 ¦ index means,- as described above. Additionally, a rais&d l9 1 rectangular segment 76 extends upwardly from surface 72 to form 21 1 a recess in the base to be molded, which recess is used to seat a magnet or a steel plate.
~3 l! As sho-in in greater detail in Figure 8, the insert includes a raised part 78 commensurate in conflguration with ~I the platform of the base to be formed. Threaded cavities 80 ¦ extend into raisea part 78 to secure insert 70 hy bolts or other if means to substructure 64.
2~
I F;.(lures 9 and 10 illustrate fl~xible mold 80 ~:~hich can i be produced from a~paratus 62 by pouring a curable rubber ¦ compound into void 68 of apparatus 62 and allo~ing it ~o cure.
An e~arnpl.e of a suit~ble rubber compound is sold by tr.e l Friedheim Tool Supply Company under the mark Jofre. The mold 2 includes nipples 92 which will form depressions in the base to 3 be molded and serve as index means on attachmen~ of the base to 4 ¦ an arm of an articulator. A recess 84 is sized to receive a 5 ¦ steel plate or magnet which will locate and retain in place the 6 ¦ opposite elenent to be lodged within the base to bé formed. An 7 ¦ overhang 86 serves the same function as- insert 40 of mold 10, as 8 ¦ sho~n in Figures 1 and 2; that is, it, in combination wi,th side 9 wall 88, defines the outline of the platform to be for~ed as part of the base.
11 . ~ . .
Base 90 formable from mold 80 is illustrated in 13 Figures 11 and 12. It includes a ralsed part referred to as 14 platform 92, which platform supports tooth die 94. Tapered pins 96 or constant diame,ter pins 17 (as shown in Figure 2) may 16 be used to key the die to the base. As particularly illustrated in Figure 12, ~ saw blade 98 can be held and maintained 18 horizontal to make the mesial and distal cuts through die 94 to a point ~ust below line of demarcation lO0. Thereafter, an individual model tooth 102 or a section of model teeth can be 21 replaceably removed for working on the dental model.
23 , In operation, after formation of die 94, pourable 24 yellow stone is poured into mold 80 to a level even with the top surface of the mold and assuming that either a magnet or a 26 1, steel plate has already been inserted and positioned within 27 il the mold. ~ie 94 is thereafter placed upon -the exposed surf2ce 23 ll of yello~ stone intermediatr_ the perimeter of overhang 86 and ~9 ,I side Y7all ,,'j~ as il]ustrated in Figures li and 12. Priorly, a ,,~ release colnpound is ?laced upon the e~.posed surface of yello~
31 il stone or upon the base of the die. After curing of the yello~
32 ll stone, base 9Q is for~,ed. The base will have clisposed therein , j Trade mark 11~ 7 1 ¦ the index means as a result of the depressions created by 2 ¦ nipples 82 and includes a magne~ or a steel plate for 3 removably attaching the base to an arm of an articulator. Removal ¦ of the base from ~ithin the mold is accomplished by nor-destructiv ly 5 ¦ distending the mold ~alls to release the base.
7 ¦ Apparatus 106 shown in Figures 13, 14, 15 and 16 is 8 ¦ employed to form a fle~ible mol~ for making a full base 108 9 ¦ (see Figure 17j for a dental model. The apparatus includes a -substruc~ure 110 supportiny a cast 112. The cast includes a 11 ¦ void 11~ commensurate in si~e and planform with the exterior 12 ¦dimensions of the mold to be formed. An insert 116 is disposed 13 ¦within void 114 and attached to substructure 110. The insert is 14 commensurate in configuration ~ith the configuration of the base to ~e formed. The base includes a perimeter wall 118 to define 16 ¦the perim~ter of the base and the exterior perimeter of 17 ¦platform 122 and a depression 120 commensurate in depth, ~Jidth 18 ¦and height of the interior dimensions of the platform of 19 ¦base 108 (see Figure 17). A raised rectangular segment 124
27 ¦~ sase 12, ~hen removed from ~7ithin moId 10, i-s of a 28 1I minimum perim~ter co-~mensurate with the sides of die 16. It is ~9 ll smooth surfaced as a resu]t of the surface smoothness of the ~li various components of the mold and is ready for use ~ithout 31 i~ further finishin~ by technicians. Additionally, the die is 32 , inde~ed and includes means for adhering it to the arm of an _ g _ 0~
l articulator ~ithout further work by technicians. It is to 2 be noted, that magnet 32 may bé replaced by a steel plate or 3 l the like which will be magnetically coupled to a magnet 4 located in the arm of the articulator.
5 l 6 ~ - Referring jointly to Yigures 6-12 there is shown apparatus ~2 ~or constructing a flexible mold 80 for a base 90 8 ¦ of a dental model. The apparatus includes a substructure 64 9 ¦ supporting a cast 6~. The cast has a void 68 extending through lO ¦ the cast and commensurate in planform with the configuration of ll ¦ the exterior dimensions of mold 80 to be forrned. An insert 70, 12 ¦ representative of the e~act configuration of base 90 to be 13 ¦ developed ~rom the mold produced by apparatus 62, is attache~
14 ¦ to platform 64 by bolts or other méchanical means and located 15 ¦ generally central to void 68. Bottom surface 72 of the insert 16 ¦ includes depressions 74 for forming nipples ln the mold, 17 which nipples when reproduced by the base to be molded serve as 18 ¦ index means,- as described above. Additionally, a rais&d l9 1 rectangular segment 76 extends upwardly from surface 72 to form 21 1 a recess in the base to be molded, which recess is used to seat a magnet or a steel plate.
~3 l! As sho-in in greater detail in Figure 8, the insert includes a raised part 78 commensurate in conflguration with ~I the platform of the base to be formed. Threaded cavities 80 ¦ extend into raisea part 78 to secure insert 70 hy bolts or other if means to substructure 64.
2~
I F;.(lures 9 and 10 illustrate fl~xible mold 80 ~:~hich can i be produced from a~paratus 62 by pouring a curable rubber ¦ compound into void 68 of apparatus 62 and allo~ing it ~o cure.
An e~arnpl.e of a suit~ble rubber compound is sold by tr.e l Friedheim Tool Supply Company under the mark Jofre. The mold 2 includes nipples 92 which will form depressions in the base to 3 be molded and serve as index means on attachmen~ of the base to 4 ¦ an arm of an articulator. A recess 84 is sized to receive a 5 ¦ steel plate or magnet which will locate and retain in place the 6 ¦ opposite elenent to be lodged within the base to bé formed. An 7 ¦ overhang 86 serves the same function as- insert 40 of mold 10, as 8 ¦ sho~n in Figures 1 and 2; that is, it, in combination wi,th side 9 wall 88, defines the outline of the platform to be for~ed as part of the base.
11 . ~ . .
Base 90 formable from mold 80 is illustrated in 13 Figures 11 and 12. It includes a ralsed part referred to as 14 platform 92, which platform supports tooth die 94. Tapered pins 96 or constant diame,ter pins 17 (as shown in Figure 2) may 16 be used to key the die to the base. As particularly illustrated in Figure 12, ~ saw blade 98 can be held and maintained 18 horizontal to make the mesial and distal cuts through die 94 to a point ~ust below line of demarcation lO0. Thereafter, an individual model tooth 102 or a section of model teeth can be 21 replaceably removed for working on the dental model.
23 , In operation, after formation of die 94, pourable 24 yellow stone is poured into mold 80 to a level even with the top surface of the mold and assuming that either a magnet or a 26 1, steel plate has already been inserted and positioned within 27 il the mold. ~ie 94 is thereafter placed upon -the exposed surf2ce 23 ll of yello~ stone intermediatr_ the perimeter of overhang 86 and ~9 ,I side Y7all ,,'j~ as il]ustrated in Figures li and 12. Priorly, a ,,~ release colnpound is ?laced upon the e~.posed surface of yello~
31 il stone or upon the base of the die. After curing of the yello~
32 ll stone, base 9Q is for~,ed. The base will have clisposed therein , j Trade mark 11~ 7 1 ¦ the index means as a result of the depressions created by 2 ¦ nipples 82 and includes a magne~ or a steel plate for 3 removably attaching the base to an arm of an articulator. Removal ¦ of the base from ~ithin the mold is accomplished by nor-destructiv ly 5 ¦ distending the mold ~alls to release the base.
7 ¦ Apparatus 106 shown in Figures 13, 14, 15 and 16 is 8 ¦ employed to form a fle~ible mol~ for making a full base 108 9 ¦ (see Figure 17j for a dental model. The apparatus includes a -substruc~ure 110 supportiny a cast 112. The cast includes a 11 ¦ void 11~ commensurate in si~e and planform with the exterior 12 ¦dimensions of the mold to be formed. An insert 116 is disposed 13 ¦within void 114 and attached to substructure 110. The insert is 14 commensurate in configuration ~ith the configuration of the base to ~e formed. The base includes a perimeter wall 118 to define 16 ¦the perim~ter of the base and the exterior perimeter of 17 ¦platform 122 and a depression 120 commensurate in depth, ~Jidth 18 ¦and height of the interior dimensions of the platform of 19 ¦base 108 (see Figure 17). A raised rectangular segment 124
20 Idevelops a recess in the mold to receive either a steel plate or a magnet. Depressions lZ6 form nipples 136 in the mold 22 ~7hich r~sult in depressions in base 108 whlch serve as index means 23 1 for attaching the dental moael to the arm cf an articulator. Bolt 24 ¦means, or the like, engaging threaded cavities are employed to 25 ¦secure cast 112 and insert 116 to substructure 110.
27 By pouring a curable rubber compound into vcid 114 of 28 apparatus ]G6, a flexib]e mold 130, sho~m ~ igure 1~, is 29 ¦produced. The ~old includes an inner ~all 132 for defining the 30 llperimeter of the base, a tongue or overhang 134 for defining 31 Ithe height and ~Jidth of platform 122, nipples 136 for producing 32 1 inde~ means in the bottom surf~ce of the base and either an ' - 12 -.i 1:~'7~
1 1~ imbedded steel plate or magnet 13~ for maintaining in place 2 ,¦ the base with a magnetically complementary element. After 3 ¦ the yellow stone has been poured within mold 130, die 140 is 4 ! located thereupon, as described in detail above. Upon curing 5- ¦ of the base, it may be removed from ~ithin mold 130 by non-6 1 destructively distending the mold walls to release the cured 8 dental model.
¦9 I While the principles of the invention have now been made clear in an illustrative embodi~ent, there will be 11 immediately obvious to those skilled in the art many modifications 12 ~1 of structure, arrangement, proportions, elements, materials, 13 1 and components, used in the practice of the invention which are ;14 ' particularly adapted for specific envixonments and operating 6 requirements without d-parting from those prin-iples.
19 !
27 By pouring a curable rubber compound into vcid 114 of 28 apparatus ]G6, a flexib]e mold 130, sho~m ~ igure 1~, is 29 ¦produced. The ~old includes an inner ~all 132 for defining the 30 llperimeter of the base, a tongue or overhang 134 for defining 31 Ithe height and ~Jidth of platform 122, nipples 136 for producing 32 1 inde~ means in the bottom surf~ce of the base and either an ' - 12 -.i 1:~'7~
1 1~ imbedded steel plate or magnet 13~ for maintaining in place 2 ,¦ the base with a magnetically complementary element. After 3 ¦ the yellow stone has been poured within mold 130, die 140 is 4 ! located thereupon, as described in detail above. Upon curing 5- ¦ of the base, it may be removed from ~ithin mold 130 by non-6 1 destructively distending the mold walls to release the cured 8 dental model.
¦9 I While the principles of the invention have now been made clear in an illustrative embodi~ent, there will be 11 immediately obvious to those skilled in the art many modifications 12 ~1 of structure, arrangement, proportions, elements, materials, 13 1 and components, used in the practice of the invention which are ;14 ' particularly adapted for specific envixonments and operating 6 requirements without d-parting from those prin-iples.
19 !
21
22 1 231 . I
241 ' I
26 ¦
29 ;
~0 32 ll j ., - 13 -- '.
,. . , , I ;
241 ' I
26 ¦
29 ;
~0 32 ll j ., - 13 -- '.
,. . , , I ;
Claims (5)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A base for use in a dental model to support the bottom surface of a tooth die, said base comprising in com-bination:
(a) a body; and (b) a platform extending upwardly from said body for supporting the die above said body, said platform including a planar die supporting surface laterally dimensioned to conform generally with the bottom surface of the tooth die.
(a) a body; and (b) a platform extending upwardly from said body for supporting the die above said body, said platform including a planar die supporting surface laterally dimensioned to conform generally with the bottom surface of the tooth die.
2. The base as set forth in Claim 1 wherein said base includes a perimeter wall common to said base and a part of said platform perimeter and an inset defined by an upwardly extending wall common with the remaining perimeter of said platform.
3. The base as set forth in Claim 2 wherein said inset includes a downwardly extending wall common with said perimeter wall.
4. The base as set forth in Claim 3 wherein said platform is commensurate with a bilateral tooth die.
5. The base as set forth in Claim 4 wherein said platform is commensurate with a unilateral tooth die.
- Page 1 of Claims -
- Page 1 of Claims -
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000445685A CA1178007A (en) | 1981-02-02 | 1984-01-19 | Base for dental model |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US230,330 | 1981-02-02 | ||
| US06/230,330 US4378929A (en) | 1981-02-02 | 1981-02-02 | Mold for dental models base |
| CA000395273A CA1171210A (en) | 1981-02-02 | 1982-02-01 | Mold for dental models |
| CA000445685A CA1178007A (en) | 1981-02-02 | 1984-01-19 | Base for dental model |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000395273A Division CA1171210A (en) | 1981-02-02 | 1982-02-01 | Mold for dental models |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178007A true CA1178007A (en) | 1984-11-20 |
Family
ID=27167195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000445685A Expired CA1178007A (en) | 1981-02-02 | 1984-01-19 | Base for dental model |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1178007A (en) |
-
1984
- 1984-01-19 CA CA000445685A patent/CA1178007A/en not_active Expired
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