AU642892B2 - Dental laboratory procedure for the accuracy of the dimensional volume and of the articulation of an acrylate denture in the course of its process - Google Patents

Description

2 8 Form PATENTS ACT 1952 COMPLETE SPECIFICATION (ORI GI NAL) FOR OFFICE USE Short Title: Int. CI: Application Number: Lodged: Ctbmplet9 Specification-Lodged: Accepted: Lapsed: Published: Priority: A~~elated Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Frans flequeker Ile1_, Wyalong street Adidress of Applicant: Burwood,P.C. 2134,N.S.W.

Australia Actual Inventor: Frans Dequeker 0 L6 54 C8/0/90 10 1 12, Wyalong street Address for Service: Burwood,P.O. 2134,N.S.W. Australia Title: Dental laboratory procedure for the accuracy of the dimensional Complete Specification for the invention entitled: volume and of the articulation of an acrylate. deature in the course of Its process.

The fo fowing statement is a full description of this invention, including the best method of performing it known to me:-* Note: The description Is to be typed In double spacing, pica typo face, in an area not exceeding 250 mm In depth and 160 mmn in width, on tough white paper of good quality and It Is to be Inserted inside this form.

14160/77-L Prited byC. TjiompsoN.Actins commonwealthGovrnment Printer.,Canberra 1 -2- The invention relates to an improvement in a dental i i I I -laboratory procedure for the exact fit of -~tebase and th articulation of a new or renewed plastic denture related to the respective jaw of the mouth and replica model thereof.

S 5| To assist with understanding the invention the ,plastic denture of the present invention may be either a complete denture set comprising a full arch lower and upper denture or a single full arch lower or upper denture or a Spartial arch lower and upper denture or a single partial P i0 upper or lower.

SA renewed denture may be the proceeding of a renewed denture base(rebasing) or the proceeding of a renewed denture articulation, to a used dentureror both proceedings.

SIt will be noted that the term "denture articulation" means 'an arrangement of artificial teeth set according to.the usual clinical and laboratory procedures of the individual bite recording according to the occlusal centricand vertical dimension in the relation of an upper and a lower jaw during the course of the construction of the "plastic denture; for 20 mor specification refer to thei'D.ebtal Technician~Postheti6tBi maiual,,the Navy,U.S.A..

Further it will be noted that the denture base of the S i.plastic' denture may be designed according to any concept a vacuum designed denture base according to the doctrine 25 of Professor Schreinemaker (Holland). Also it will be understood that the denture articulation of the 'plastid, denture may be designed according to any concept and may be proceeded with a set oay artificial molar tooth desig proceeded with a set of any artificial molar tooth design 4 -I 4I 1it A *ii q~Y -2e.g. a. the available "Bio-mechanical" type denture articulation procedure proceed with the known "Bio-mechanical" type artificial molar teeth provider: Lactona,Universal Q Dental Company,U.S.A.); b. or the "Centrimatic" type denture articulation procedure proceed with the known. "Centrimatic" type molar teeth (provider: Swissdent Corporation,U.S.A.); c. or the combined "Bio-mechanical" type) "Oentrimatic" I nt' type denture articulation procedure proceed with said "Bio-mechanical" type molar artificial teeth (provider: F.Dequeker,Australia); d. or the usual balanced denture articulation procedure being proceeded with the Hanau or Dentatus or Freeplane dental articulator which are known and available dental precision tools (detailed in the complete description).

?Most dentures are fabricated from acrylate.or deratives thereof utilizing the heat-cure two-part type polymer/ monomer poly- 0 methyl methacrylate denture base resin which is processed as usual by known injection moulding or compression hot water curing techniques.

TLhese acrylate denture techniques are not always satisfactory as they run the risk of producing intra-oral ill-fitting dentures in the most cases due to the different crosssection of jaws.

It is well known in the dental practice during the S fabricat^ion proces; 3 of the acrylate denture using heatcuring techniques regardless of the type of acrylate resin -4employedthat a processing defprmation. of the specified denture base and the respective denture articulation is apparent when the cured denture is recovered from its mould in order to check its fit on the, replica denture processing, model detailed in the full description), This is caused by a heat build-up in the resin during the curing stage and results in a shrinkage of the acrylate denture when removed from the mould and alloVed to cool.

This phenomenon of custom denture processing deformation is universally recognised as a major disadvantage when using the conventional heat-cure typeiacrylate base material and the conventional denture fabrication method.

In most cases the denture processing deformation effects an dimensional denture :ill-fit to the jaw of the model and mouth,! a molar-to-molar tooth arch deformation,a volume shrinkage along the cross-section in the sagittal and -ransversal direction of the denture base,together with an occlusal vertical dimensional increase of the denture occlusion and articulation;stand.

'I A- known improved acrylate denture fabrication system (Kulzer,W-Germany) attempts to minimise these problems by using a chemical cold-cure type polymethyl methacrylate denture base resin which is activated by a chemical catalyst and utilizes the injection or the compression moulding techniques already specified.

The drawbacks with this system are as follows: a. While the initial intra-oral denture fit is quite accurate shrinkage of the denture occurs during use, u usually over a period of months. This is caused by the gradual evaporation of monomer residues trapped in the denture material during the cold-cure polymerization.Moreover allergic reactions to these residues commonly lead to inflammation of the gum and oral tissues.

b. The process is inherently costly and labour-intensive compared to other techniques.

It is the object of the invention to overcome the.

denture deformation. as aforespecified during the prior art process of the acrylate denture.

A major, advantage or feature of the present invention is: the usual dental laboratory equipment/procedure.

the exact fit of the acrylate denture base and of the denture articulation according to any concept,is achieved without having to alter the masticatory pattern of specially 1 designed preformed artificial molar teeth.

According to the ivention there is provided a dental laboratory step-by-step procedure/for the exact fit of the i base,substantiallof plastic,and the articulation for a denture related to the jaw(s) of the mouth apdreplica processing 20 model(s) thereof comprising the technique steps:Providing and utilizing a controllable vertically adjustable dental articulator(or occludator)designed with model members for fixing and releasing the denture 'processing model(s) during the formation of the denture(s).Filling-in the surveyed 25 undercuts on the tissue surfaces of the model(s).

-6- Mounting on the articulator the model(s) provided with the predeterminid individual intra-oral bite recording in the centric occlusion and in the desired occlusal vertical /dimension stand .defined by the guide pin.Modelling and Sreinforcing o ia denture base(s) substantially of a su table Sdental material according to any fiorimph the respective model(s).Settin -up of artificial teeth on the denture base(s) utilizing an appropriate wax or medium forming hereby the denture articulation according to any form thereby accomplish S ing a-trial denture(s). Withdrawallof the trial denture(s) from its respect yemodel(s).Preparing the plaster mould(s) from the trial denture(s) according to the lost wax technique.

o Packing the plaster mould excluding or including with the denture base matelial,utilizing hereto a resin substantially of an appropriate synthetic moulding resin forming hereby an intermediate denture(s).Re'overing the intermediate denture(s) fe: from the plaster mould(s) and trimming.Reducing,if needfully, the tissue facing surfaces of the inner aspect of the intermediate denture(s) so that the denture base(s) and articula tion obtain an approximal appropriate relation with the jaw of the model(s) utilized in the dimension stand as specified in the mouning step thereby securing the desired relation with an appropriate die and technique.Relining,utilizing an appropriate technique whereby a curable mouldable synthetic denture base resin is adapted\to the reduced tissue surfaces of the intermediate denture base(s) and moulded on the respective jaw(s) of the model(s having been absorbed with water,dried and coated with an appropriate release medium,& with the model/ relined intermediate denture as specified to the mounting 7i?, and die-relation stand.Securing the relined base(s) of the -7intermediate denture(s) to the respective model(s) of the previous step hereto utilizing the appro:i;..ate synthetic, resin and technique'.Chemical curing for hardening the relined.

intermediate denture(s) on the model(s) and on or from the articulator in a water pressure vessel having hot water or in an appropriate light source,further checking and minor correcting of the denture articulation on the articulator.

b'.se rec -9 le In the case of an upper denture,the denture 1 may be e4 ther p-oceeded with a dntLiMP bne without palate according to the dental laboratory procedure as aforespecified or.-peroeeded palateleB ering- to the conventional dental laboratory procedure.The relining may be combined without or with any additional tissue friendly substance.

A particular embodiment of the invention will now be described clarifying the development of the technique steps used in the dental laboratory procedure of tie present invention provided to obtain the accurate custom fit of the denture base ,substantiali of plastic and of its articulation relative to the respective jaw of the mouth and 0 and of the processing model replicated thereof.

o**o o clarify the invention,the denture processing model(s) is expected to, be a true replica of the natural jaw(s),produced in the known shrink-free way for a denture substantiall'of acrylate or derivative or any useful plastic of present

I

invention and its quality will be conserved during the entire process of the denture.

The inventive procedure is initiated with the step(a)( there is provided and used a controllable vertically adjustable arf rigid metal ad in function for ticula t r!'gubatantiam rigid metal and in function for -8- Ssetting-up and relining the denture of the invention.

General it is composed of an upper and lower model base plate member in function to fix and release 'spedtively;the upper and lower model.The upper model base plate is collapsable by a hinge.The plates are mounted parallel-wise,having one end mounted in right angle with an adjustable and fixable "up and down" telescopic arbor,according to a suitable ir precision design and the other end is mounted in right angle with an adjustable and fixable "up and down" pin deviced as the known incisal dental articulator pin with.millimeter reading and freely and fixable engaged in the upper and lower plate member used to' define) and control the desired vertical dimensional stand of the denture.A similar pin is provided in the form of a "boltlnut" component used to fix the appliance and relined denture in the desired vertical ii dimension stand as specified.

Asspecified the processing models are releasable secured to Stheir model member;one designed to secure and to release Q" the denture processing model and the other'vertically opposed member designed to secure and to release the antagonist model or a second denture processing model(representing hereby the 0 :.upper oc lower jaw) in the usual predetermined individual bite recording as specified hereinafter.

As known the denture, processing model and its respective Z antagonist model(representing the full jaw complex) are mounted C in the articulator with said bite recording to the known i: occlusal centric and occlusal vertical dimension stand of the upper and lower jaw relationship;refer to the "Dental I- Technician Prosthetic" manual,the Navy,U.S.A The dental articulator is a tool designed and utilized to arrange the artificial teeth according to any concept as aforespecified(in page 3,lines 1-17) during the usual fabrication of the trial denture procedure.

SIn the next step(h),the surveyed undercuts o£ the denture processing model are blocked out(filled in) using stone plaster to fill in said undercuts on the tissue surfaces of said Smodel(s).

se:.

y y

A*

ft ee 4 00 0 •0• 0*00 set* Dee ply -,grooved .and sharp surfaces Iof the dentur6 processing miodel(s). mr y be smoothed using stone plaster.

in,,)he next step(c),the denture proce-ssi g model, and its antagonisic model(or denture processing model) are mounted'int Sthe respective model members and provided wl+k the known predeterminedrindividual intra'-cral bite recording in the occlusal and verti3cal dimension stand of the-j1aws defined,,: 'by the'gautge-pin of the articulator as specified.

In the next step(d) a trial dentilre Uase(s) is prepared on the, model(s).Hereto the base is formed normally from *a suit,.ble dental base material such as a tougic wax and a reinforcements utilizing tension free galvanized wire.

Alternatively for i-eason of an adequate and reliable dimensional stability and rdinforcement together to hebase) therefor this may b'eirather formed from plasticJrfi general) ,the base is chemical either an heat curable monomer/polyer Iacrylate or, derivative copolymer I comonomer proceeded ,by

I

1 1Al~e known f~lask/ lost Wax techniquei Or the base is a monomer ".free pure ,acryla ,te utilizing one or two(bonded together) 2$prepolymeriz ed laminate sheet(s) in clear qr pink translucent 'vacuum formd'd on "the model iby the known procedure s .Q-th*e Poy S*O 0r0,e Or the base may be formed utilizing a clear -pe eyen or :vinyl prepolymerized-j1aminate sheet vacuum formed on the model and bonded with, ,a translucent gum coloured prepoly- ,~5merized said acrylate sheet vacuum formed on top of the *1 fooC0,-0oprevious pelygavbia r vinyl sheet conditioned utilizing a *bonding medium based on a clear cold cure-methyl or ethyl Imethacrylate flowable resin Or the base may be formed utilizing a transluceht gun oloured prepolymerized urethane-acrylate *boo adapted on the model and lightcured as known.

169-a It will be noted' that said plastic denture base will be -used as a-trial and meanwhile as an intermediate and as a permanent denture base and has the preference of choice to a wax denture base.In this case the ridge port, tion of the bade' is either fprmn'd with inverted conicalL blifid holes or in a grid designed for mechanical retentioxi of the wax and in a later stage. for plastic utilized as a mediuot in the next- ,technique steps.

In. the case the plastic denture is an upper base processed from the ,proposed chemical heat curable monomer/polymer acryla~e type(refer page 9,line 24-26),in need this base wi)lfl~be designed without palatal portion in order to obtain the proper seat of the base relative to the jaw In the next step(e) the artificial teeth are set using wax or laiiy suitable medium adapted on the trial .denture base(s) of step(d.) forming herewith the d~nture articulation according to ~th-e type selected as aforespecified in pagp 3,lines 1-17.

Ily-the step(e)l a2trial denture(s) is constituted for the reproduction of E ex't intermediate denture(s) proceeded ofplastic for,A Te case to be treated and according to the Present invention..

51 In the next stelp(f) the dI;rigl denture(s) of step(e) is withdrawn without distortion from its respective-.,processing model(s). After trying the trial denture(s) in. mouth in the rbict step(g) the plaster mould(s) is prepared as usual from' othe trial denture(s) of step(f) and .is performed to the known-dental laboratory "lost wax and flasking" procedure., :In'the' base'.'the base' of the trial'denture(s) ok-~step(d),..

is made of. said plastic as cited,the base may be excluded or included in the mould..

IIn the -next, step(h) -the plaster mould-& teeth of the step (g)aro' packed as usual with a selected.,curabie gum tinted colour stable acryla1e or derivative(eg ethyl methacrylate or other co-polymers/co-monomers) denture base resin material either based, on, a heat curable type(eg 7.0 C at .I ho ur and further 20 boiled in 20 minutes) or a rapid heat curable type(eg boiled in 20 minutes).

I -For thick heavy intermediate denture(s) the heat :curable type is cured at 70 C in 8 -hours nightly and further boiled In 15-20 minutes.

Referring to previous N.B./in the case the trial denture base is made of said plastics as' cited in step(d) and -o be included in thl' mould,in that 06 C :23 cast an acrylate or daerivativeeg. -co-poilymeri co-monomers) 61 a selected and provided,and used such as ,a colour stable gum' coloured'low heat' 'quick cure cured at 50 0 0-70bC in 'i.minuttes/ acc.o r ding to the .known hydroflask or pressure vessel procedure,a brand ',11 SuperIimpact' based 'on a reinforced'i or deri'~ative available from the inventor In the next step(i) -the intermediate acrylate(or derivative) if denture(s) of step(h) is recovered from the, plaster mould(s) +r C1r in order to be iee4Iaccording to..the ,i sual procedure 9 excluding the final polishing stages to/ 1 0 0: 6 0 -11- Normally the step(i) with final polishing produces the final plastic denture,but my.tinvention adds the following step (j) to fine tune the fit of the custom denture(s) including its denture base(s) and denture articulation relative to the jaw(s) according to its-individual bite recording of step c as afore .specified.Therefor the tissuesurfaces(entire inneraspect of the denture base) of the acrylate(or derivative) intermediate V nee Futoy denture(s) are reduced ea- 4i-twhich leads to the inventive dental laboratory procedure in stea(j), Step(j)is provided by utilizing a suitable motor grinder fitted with a chuck and a s6t of available rotary instruments including known denture sandpaper drums in small and large S diameter and a long conical metal bur.These items are used to evenly reduce the inneraspect of the base.

5 The amount of base reduction is proceeded by grinding stepwise the inneraspect till the appropriate relation with the jaw of the respective model isoapproached.

Besides the reduction is controlled when the stand of the articulator geme-pin-relative to its respective lower base model member of the articulator is in the initial *nd desired stand according to the step c. Also said act of base reduction and gag~e pin stand control allows the practitioner to constitute the desired correct denture articulation according the prpoed technique step c.

0. proposed technique step c.

S.'

'S.

So so

'S.

so 00 00 25 In order to secure the corrected relation of the base(s) and articulation according step c,hereto the relation is secured utilizing an appropriate sticky wax or cold cure resin applied on the joined back and front teeth in articulation.

!X

-1 a Thereby a counterdie'is customfornied from plaster filled, in the,-cavity of the lingual/palatinal area of the denturemodel c.omplex including the model(s) area extending, teyond the tdenture bhorde ring. Further allowing the plaster- to be i~n )/dontact. with the lingual and palatal aspect of the teeth.

The~ d rgheinemdaednture inneraspect(s) is prepared with conical inverted blind channels(except perforations) in the ridge area (the palatal area excluded) and cleaned with monomer.

S.:

W so 0,0,004 0 0*0.

16' ,09, too* S S soS /o so 00 S to.

le toSe 0S SS so* SS00 S -12- In order to restore the inneraspect of the reduced denture' base(p)s)Vof step(j) for the fit with the tissue surfaces of Its 'jaw(s) the denture processing model (s),hereto 'in step(k) ,of the: ,inv'entive dental laboratory procedure ,the surfaces of the denture base are reformed.

Therefor step k provides the ',fsubsequent acts :detaching the q,~u processin moe gsrom its respective fixable mode 17m! rember(s)(-, 'of the articulqator,absorbihg the model(s) with water to eliminate-the air~dlrying ,n odel(s),' and coating its l0'jaw(s).with a separator inediujn"(cold mould seal),replacing the mo- Idel(s) into its respective miember,'ready to reform the inter- :mediate identure@s)J of step h ,Lnto, ~a rel ned intermediate denture as 'the soughtof i~lalj plastic denturei($) *of the ows invention. Hereto 'the option technique for the a application of a.,i reline to the inneraspect of the reduced bas ,sei),of thelintermedijate denture-C6) ),step his proceeded by the further act, of step k:selecting,providing and using a curable mouldable-flowable synthetic denture base resin featuring a :a 0: low-.heat"l and 4'~rapidiI curable polymeri-monomer system -chemical based on an acrylate or der!-vative(eg co-polymer ao-monomer ethyl-methacrylate) dosed with an appropriate slow initiatorj'aativator catalyst designed for a sufficient reline working time together with a suitable two phase too*. relining techniqueldspt fuuctnif ire abieLz beiparaurt in the 32.boratorbt,and for a rapidiJly hardening,using heat of i50-80 0 and water or air pressure of 40-60 pounds per square se inch using hereto a water polymerization vessel.

,at a 'a0 1 0

OS

C

000.

0 *0 0 0**0 0 *0*0 00 a 0 *0 *0 e *0*I 0 0 *00 0

OS

'0 04 0 000.0 4 0 *4 *0 CeO.

.0 a.

*0 00*~ as. 0* *00 00* 00 0

C..

9.

C

'9.

C

'C

C

C

00

C.

.C0 *0 a A -13- Fromn this composition resin as specified, the monomer"*component is kept refrigerated at 106C- 00 for furtb"" I~ *mixture with its polymer used in a /consistency as a flowablemouldabl6e-alu rry proceeded to ap~ply the reline for the i-ntermediate denture(s) using a two phase technique outlined he)?eafter in the'reline technique.

A suitable reline technique may prbvide the following acts eg in the upper intermediate denture mounted on the articulaitor ;Incits counterdie of step J: firstly the. proposed resin slurry is applied on the respective central portion of the inneraspect of the li'trmtla L -as. and its respective portion of the jaw, mode lowering the upper model articulator member -fixed with the respective relined upper model- accordingly 15 a parall~l course with its opposed lower member,allowing hereby to insert and relate. the jlw of the upper model into the opposed innera~pect of' the relin~ed intermediate denture 0moun'd4 on its counterdie,thereby the desired lowering level of the, member is control1~ible having the i,ncisal gQuige..,pin 20 in contact with the base of the lower model articulator member fixed with the respectiv'e antagonist lower model; seuigpeiu oeiglvltn tlzn oi thick rubber band wrapped around-the articulator members 7 or :alternatively, securing the stand utilizing the additional gitpin (bolt Jnut system) as proposed in the composition of the articulatorJ reline appliance refer page ,4Ie To avoid any movement to the relined denture ,base(s) and' articulatiori,the next step(l) provides securing the \eA.

.29 border with a non-releasable sticky wax or cold-cure type <2 At -14acrylate adapted into prepared channels of the model f6) placing the artlculator/reline/models complex in. the pressure polymerization vessel filled with hot water of 60-800C at the required level as known and at a air pressureof 6 60 pounds atmosphere using a curing time of 20 minutes; 'removing the complex from the vessel and further completing of the reline by repeating the similar procedure applied to the remaining portion(ridge areas) of the inneraspect ofAhe" intermediate denture(s) Note: To avoid an excessive thick upper plate in the case of a relined upper intermediate denture,the following acts are proceeded:cutting out the palatal portionj preparing blind channels(no perforations)in the ridge area of the denture inneraspect,attaching a foil of tin in a i suitable thickness to the respective palatal area of the counterdie,and proceed the reline technique as said.

S O The relining may be excluded djo included with any additional tissue friendly substance as metal foils, adhesive creams or plastic coatings egbaaed on light

S

20, curable urethane/acrylate or non-reactive urethane and other, *0 In the case of a relineifor a lower 5e50 0 intermBdiate denture,the same procedure is applied however proceeded with the articulator in reverse stand(upside down) :0 0. and la,' upper and lower reline can be proceeded at the same time on the proposed appliance.

Finally the relined intermediate denture(s)of step k is ~anehedkand checked for minor S corre.ction of its articulation on the setting-up and relining articulator -14- a 0 Referring back to the laboratory reline material as :aforesppcified at page 12,line 14,besides there are- I clinical', hard reline materials which may be applied; Eg a type deoigned to be se, hardened by a catalyst r'without to eifect or to burn the tissues proceeded directl' to the jsaW(s of the mouth.Or a type such as a light curable or a dua.l~light+ self-hardening) curable reline composite material (available from using a photo, initiator and chemical 'initiator, catalyst system thereby hardened lo tilzn ih solice Halogen or Ultra Violet fea turij a capacity of, 450-750 1Vanometers wavelenght.

It will, be' noted *that a light cured type reline material either n gelVr miouldable -flowable paste fovm is suitable for a series of relines proceeded according to a one phase relining technique and further suitable for the application of thi~nly- rel~ine s int'D a base made from acrylate or derivatives(except a base made from urethane I acrylate composite which needs extra bonding mediums related to acrylate) it is to be understood that both-the rapid 9: to: llow -heat"l and rapid "light" or "dual" curable relining forms of step k are to be interpreted as examples of preferred relining techniques and are not to be taken as being the only possible means of methods thereto to produce S2<the!desired result.

too: Also it will be understood that the 0 C) inventor is well aware that an improvement-for the acrylate 000(or derkvati~es) denture problem may be approached to a terai extnsin wil-liout the application of the complete 4 -14-b dental laboratory" procedurec of the present invention.For instance,in a Lull upper acrylate (or derivatives) denture fea.turing, a deep palatal proBB-section,the denture baseincludingthe 'alatal part may be reduced in the form of a Shorse shoe In this case the denture base may result in a more or *0 V,000 00 *0 0 .0 00 0 0 0$ 0000 0 0*0006 ''ess'fit to its respective jaw of the modei.Ilowever -the same, denture may fail by an incorrect denture articulation as specifi~d,d ue to" its irnC:orrect Jne,4i 'dvertical occlusal dimension which leads to said failure caused by the volume shrinkage of the' medium' 'between, the base and the teeth during the denture fabrication.Therefor in the case of an upper acrylate dejnttuie_,the denture base may be alther prnooodpaleateless the, dental laboratory ~procedure as~sid ors Paaee~odnl the conventional dental laboratory 1IO,proce'du'eland its..denture articulation is corrected as known on the ariultr The present invention is believed to provide an efficient, and convenient solution to the roblem created by the ,conventional dental laboratory procedure which occurs when. the usual heat-cure' denture acrylate I(or derivative)'t is applied causing denture deformation in the course of the fabrpication of an. 'plastic. dexiture.

It should be ~understood that al.ternative steps and perhaps means for th'e'ipre sent inventive method in 2Q the provision of the present denture dental laboratory procedure as specified for the plastic denture featuring an 0 :600 exabt denture base and articulation,may either substi. ute or :0004, combine or delete or add certain steps of technique -to the inventive dental laboratory procedure withouit departing *'rom, the adope-and~ spirit of'Ithe invention as recited in the appended claims:

Claims (5)

1. .iantal laboratory procedure for an exact dimensional fit of a base,substantially of plastic,and ,articulation for a denture(s) related to the respective Jaw of the mouth and replica processing model(s), -thereof comprising technique steps: a. providing and utilizing a controllable vertically adjustabled d ental articulator designed with a guide pin and model-'members for fiiing and releasing a deanture processing model during the formation of the denture(s),; b. fillin~ -in the surveyed undercutsl 'on the tissue surfaces o the model(s); c. mountin', on the articu."ator the model(s) provided" iS 'with the piedeterpne iniiuli~r-oral bite recoirding nthe bsntric occlusionrilIand in the desired ocolusal v~ rtical. dimension stand, defined and controlled by the guide pin; d. modeli~ g and reinforcing of the denture base(s)

2.0 substantia lly of a sp/itable dental material according to any form~ on the respective model(s); setting-up of artificial teoth on the denture base utiliz, ng an appr~opriate wax or medium forming hereby the denture, articulation according to any there!y accomplishing,,a9 'trial denture(s); f. withdr wal of the trial denture(s) from its resrectiv model(s); go prepari/ng h plaster mould(s) from the trial P. PP a p 4 P P. 44 d* P P 44 4

4.49 4 4 P. 4 a. 44 4 4 S S SS S. S.. S 5S*S S S S.°i S S S S -17- denture(s) according to the lost wax technique; h. packing the plaster mould,excluding or including with the denture base material,utilizing an appropriate synthetic moulding resin thereby forming an intermedi- -ate denture; i. recovering the intermediate denture(s) from the 'plaster mould(s) and trimming; j. reduc~ng,if needfully,the tissue facing surfaces of the inneraspect of the intermediate denture(s) so that the denture base(s) and articulation obtain an approx- imal appropriate relation with the jaw of the model(s) utilized in the dii~nsion stand accordingly step c., 'thereby securing the desired relation with an appropriate die and technique; k! relining,utilizing an appropriate technique whereby a curable mouldable synthetic denture base resin iS adapted tO the reduced tissue surfaces of the intermedi- ate denture base(s) moulded on the respective jaw(s) of the model(s) having been absorbed with water,dried and coated with an appropriate separator,and with the model relined inltrmediate denture accordingly the dimension stand and relation of the technique step j; 1. securing the relined base(s) of the intermediate denture(s) to, the respective model(s) of the technique step k. utilizing the appropriate synthetic resin and technique; m. chemical curing for hardening the relined intermedi- ate denture(s) on the model(s) and on or from the articulator in a water pressure vessel having C S I, .2i 06 S 45 -18- hot water or in an appropriate light source,further checking and minor correcton of the denture artic- ulation on the articulator. 2. A dental laboratory procedure of claim 1,wherein the upper denture h'ving a. palatele s .den.ture .base ei ther according to the dental laboratory procedure of claim 1 or'to the traditional dental laborator! procedure 3. A dental laboratory procedure of claim 1,wherein the articulator is a combined setting-up relining tool for setting-up and relining the denture(s) during the course of its construction according to the invention. 4. A dental laboratory procedure of claim 1 or 2 wherein the reinforcing trial and permanent base is substantially of a acrylate or derivative co-polymerfmonomer or lamina- tion:polycarbonate or vinyl sheet prepolymerlpolymer- monomer methyl methacrylatelacrylate sheet prepolymer or aerylate-urethane prepolymer reinforced ,when needfully.

5. A dental laboratory procedure of claim 1 or 2 S. wherein the denture base reline material of step k. is a mouldable-flowable synthetic resin based on a hard low-heat rapid curable acrylate or derivative predosed with an appropriate slow initiator/ activator catalyst designed for a sufficient reline working time when combined w-th a suitable phase relining technique,and for a rapidily hardening using heat and water or air pressure or light or combinations thereof.

9. -19- A dental laboratory procedure of claim 1 or 2, wherein the technique step k. of relining may be combined with or excluded from any additional tissue friendly substance. ca L- )0 SS SO so 9:00 :0 9S*C s 0 S *0 0 seS 0655 S.0006 Y s 5 r 0* 9 S 9090 S .u S o osees S S *5 50 00 0 00 9 05 5 9 5500 4A 7I 4!\i r