7 Amprenta in Protetica Fixa

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    Amprentan protetica fix

    Catedra de protetic dentar fix 2005 -Sef de lucrri Dr. Sergiu Drafta

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    Cnd precizia conteaz

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    Amprenta

    Definiie: este oreproducere n negativa unui relief

    Scop: confecionareade modele de lucru, destudiu, document,duplicat

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    Clasificarea amprentelor

    Amprenta unitarAmprenta sectorialAmprenta global (unimaxilar)Amprenta bimaxilarnregistrarea de ocluzie

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    Care sunt obiectivele uneiamprente?

    S reproduc exact forma, detaliile idimensiunile dinilor preparai

    S redea ct mai fidel limitele cervicaleale

    preparaiilor S redea cel puin 0,5 mm. de structur

    dentar nelefuitdincolo de limita cervicala preparaiei

    S nregistreze exact rapoartele preparaiilorcu dinii vecini

    S reproduc precis ceilali dinide pe

    arcad i crestele edentate

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    Obiectivele cursului

    Controlul fluidelor Eviciunea gingival Materiale de amprent Portamprente Tehnici de amprentare

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    Controlul fluidelor bucale

    Rulouri de vat i compreseAspiratorul de saliv, svedopterul, aspiratorul

    chirurgical

    Medicaia antisialogog

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    2003 B D f lt!

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    Medicaia antisialogog

    Anticolinergice: Atropina, diciclomina,bromura de metantelina (Banthine 50mg.)sau bromura de propantelin (ProBanthine

    15mg.) Pruden la btrni i la persoanele cu

    afeciuni cardiace sau glaucom De elecie CLONIDINA (antihipertensiv) 0,2

    mg.

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    Eviciunea gingival

    Metoda mecanic Metoda mixt: chemo-mecanic Metoda chiuretajului gingival rotativ Metoda electrochirurgical Metoda laserului

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    Metoda chemomecanic

    nururi Substane astringente Instrumente de

    introdus nurul Tehnici

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    CONDIII

    Sntatea esutuluimoale Nivelul pragului Calitatea restaurrii

    provizorii Ajutor suplimentar =

    0.12% clorhexidinapade gur cu 2 spt.

    nainte de amprentare

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    Eviciunea gingival

    pentru a obine un bun acces al materialuluide amprent subgingival

    Deplasarea lateral a esutului moale=cantitate adecvat a materialului deamprent

    Deplasarea vertical a esutului moale=expune zona dentar nelefuit dincolo delimita cervical a preparaiei

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    nururi de eviciune

    Rsucite

    mpletite

    Cu mijlocul plinCu mijlocul gol

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    nururi de eviciune

    esuteAu mijlocul gol Mai compresive i

    ies mai greu din

    an Se pot mbiba cude 2,5 ori maimult soluie

    Sunt mai destiate dectprinse de freze

    Impregnate sau

    neimpregnate

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    nururi de eviciune

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    Substane astringente

    Clorura de aluminiu Sulfatul feric Sulfatul dublu de

    potasiu i aluminiu Epinefrin racemic

    8%

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    Clorura de aluminiu

    A se evitaconcentraiile 10%

    4min. aplicarea

    Retracie gingival de0,1 mm frC.I. & efecte

    sistemice minime

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    Clorura de aluminiu

    Avantaje Hemostaz

    moderat Deplasare tisular

    moderat

    Dezavantaje Pierdere tisular

    moderat Distrucie local

    tisular dac sefolosesc conc maimari de 10%

    Gust extrem deneplcut

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    nurul impregnat trebuie lsat nanul gingivo-dentar cel puin 4

    minute pentru o lrgire de 0,2mm. (timp de 20 sec.)

    Baharav H, Laufer BZ, Langer Y, Cardash

    HSThe effect of displacement time ongingival crevice width. Int J Prosthodont.1997 may-june 10 : 248-53.

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    Sulfatul feric

    Sulfatul fericsoluie15.5% ASTRIGEDENTSulfatul fericsoluie20% VISCOSTAT

    Vindecarea este mai rapid dect n cazul AlCl3 Se folosete1-3 min. esuturile temporar colorate i vor reveni n 1-2

    zile Dup utilizare , esuturile trebuie bine splate

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    Soluie de sulfat feric15.5% ASTRIGEDENTSoluie de sulfat feric20% VISCOSTAT

    Avantaje Hemostaz

    excelent Pierdere tisular

    minim Deplasare tisular

    moderat Timp de aciune

    lung

    Sulfatul feric

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    y

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    Soluie de sulfat feric15.5% ASTRIGEDENT

    Soluie de sulfat feric20% = VISCOSTAT

    DezavantajeColorarea esuturilor tranzitorie

    Traum tisular moderat

    Gust neplcut

    Interfer cu priza unor materiale dac nu

    este splat

    Sulfatul feric

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    Epinefrina

    Creterea ritmului cardiac Creterea forei contraciilor cordului Tahipnee Cresterea TAAnxietate

    TOTAL CONTRAINDICAT LA PACIENIICARDIACI

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    Instrumente pentru introducereanurului de eviciune

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    Armamentarium

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    Tehnici

    Introducerea nurului de eviciune Benzile de retracie Merocel Folosirea spumei Expasyl

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    Procedura practic

    Verificarea statusuluiesutului moale Dac sngereaz

    hemostaz

    Dac nu se poate facehemostaz Verificarea adaptrii

    marginale a lucrriiprovizorii, finisare ilustruire

    Prescrierea de CH iamnarea amprentei

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    Procedura practic

    izolare Se msoar adncimea

    anului gingivo-dentarpentru alegerea grosimii

    nurului Se impregneaz nurul n

    substana astringent Se nfsoar nurul n jurul

    dintelui i se introduce n

    anul gingivo-dentar Se ncepe din zonaproximal

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    Plasarea snurului

    Trebuie evitata presiunea

    i inserarea exagerat

    Lezarea inseriei epiteliale

    Lezarea esutului gingival

    Crete hemoragia

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    Cu un nur sau cu dou nururi???

    Tehnica cu un nur Simpl& rapid De elecie n90% din cazuri Adncimea anului

    grosimea nurului. #000 (negru) = 0.5mm

    # 00 (galben) = 0.8mm

    #0 ( mov) = 1.0mm

    #1 (albastru) = 1.2 mm

    # 2 (verde) = 1.4mm

    # 3 (rou) = 1.5mm

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    Tehnica cu un nur

    n special pentru diniianteriori

    n sanurile adnci esutul poate colaba

    deasupra nurului=accesul materialului deamprent restricionat

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    Tehnica cu un nur

    Snurul trebuie s fie vizibil n an, (dac nu e

    vizibil=prea subire)

    Se menine n jur de 5 minute i se scoate

    nainte de injectarea materialului de amprent

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    T h i d i

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    Tehnica cu doua nururi

    Tehnica cu doua

    nururi

    cronofag Pentru anuri adnci

    Dac sunt dificulti n

    obinerea hemostazei

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    T h i d i

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    Tehnica cu dou snururi

    etape Un snur subire(mrimea000 - 00 ) se

    plaseaz adnc n sanul gingival(n

    fundul anului)sub marginilepreparaieipentru a controla

    umiditatea i hemoragia

    un snur mai gros se plaseaz

    deasupra (0-1) i se lasa in jur de 5

    min.

    Snurul de deasupra este indeprtat

    inainte de injectarea mat de amprent

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    Tehnica c do sn r ri selecti

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    Tehnica cu dou snururi selectiv

    n anumite zone ,nspecial interproximal

    Se introduce o micbucat de nur n zona

    repectiv iar apoi seintroduce n totalitate(360) al doilea nur

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    T h i d i

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    Tehnica cu dou nururi

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    Sfat ri

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    Sfaturi

    Nu realizai pragul mai adnc de 0,5 mmsubgingival

    Lucrrile provizorii trebuie s aib oexcelent adaptare marginal cervical i sfie foarte bine lustruite

    Succesul amprentei finale depinde n maremsur de sntatea esutului moale

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    Benzile de retracie Merocel

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    Benzile de retracie Merocel

    Hidroxilat polivinil acetat

    Material sintetic absorbant hemostatic

    Se menin cu ajutorul coroanelor provizorii10-15 min.

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    Folosirea spumei Expasyl

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    Folosirea spumei Expasyl

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    Metoda chiuretaj gingival rotativ

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    Metoda chiuretaj gingival rotativ

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    Metoda electro chirurgical

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    Metoda electro-chirurgical

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    Materiale de amprent

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    Materiale de amprent

    Poggioli 1953 Bratu 19941. materiale rigide i semirigide ireversibile

    (gips, acrilat, paste ZOE)

    2. Materiale rigide reversibile (compounduri,ceruri, materiale bucoplastice)3. Materiale elastice reversibile (hidrocoloizii

    agar-agar)

    4. Materiale elastice ireversibile (hidrocoloiziiireversibili, elastomerii de sintez:polisulfuri,siliconi, polieteri)

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    Hidrocoloizii reversibili

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    Hidrocoloizii reversibili

    Avantaje: hidrofili, timp de lucru mare, ieftini,nu este necesar lingur individual

    Dezavantaje: lipsa stabilitii dimensionale,

    rezisten sczut la rupere, echipamentspecial necesarAmprentele trebuie turnate imediat

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    Polisulfide

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    Polisulfide

    Avantaje: rezisten la rupere mare,radioopac, cel mai ieftin elastomer

    Dezavantaje: miros neplcut, timp de priz

    lung(12 min.), pteazAmprentele trebuie turnate n prima or

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    Siliconii de condensare

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    Siliconii de condensare

    avantaje: timp de priz scurt, inodor, poateavea orice culoare

    Dezavantaje: capacitate de umectare a

    suprafeelor sczut, hidrofob, stabilitatedimensional sczut Modelul trebuie turnat n prima or dup

    amprentare

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    Siliconii de adiie

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    Siliconii de adiie

    Avantaje: stabilitate dimensional, contraciede priz minim, timp de priz scurt

    Dezavantaje: hidrofobi, capacitate de

    umectare sczut, priza este inhibat deunele mrci de manui Turnarea modelelor poate fi amnat

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    Polieterii

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    Polieterii

    Avantaje: stabilitate dimensional, precizie,timp de priz scurt, hidrofil, dispozitivautomat de malaxare disponibil

    Dezavantaje: rigiditate foarte mare, imbibiie,timp de lucru scurt Pruden n timpul demulrii

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    Proprietile materialelor de

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    Proprietile materialelor deamprent elastice

    Capacitatea de umectare a materialelor Tixotropismul Vscozitatea Rezistena mecanic Deformarea permanent Contracia de priz

    Stabilitatea dimensional

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    Capacitatea de umectare a

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    Capacitatea de umectare asuprafeelor

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    Capacitatea de umectare a

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    Capacitatea de umectare asuprafeelor

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    Tixotropism

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    Tixotropism

    Capacitatea unuimaterial de a curgecnd este supuspresiunii

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    Vscozitatea

    Consisten chitoas PUTTY Consisten crescut HEAVY BODY Consisten medie MEDIUM BODY Consisten fluid LIGHT BODY

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    H R polisulf Siliconc

    Silicona

    polieteri

    Deformare

    permanenta

    1,2 2,1 0,5 0,3 1,1

    Variatiidimens

    Dupa 24h

    >5 0,25 0,6 0,05 0,3

    Contractiepriza

    0,15/0,5

    0,2 0,3 0,05 0,2

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    Malaxarea

    Manualn pistolAutomat

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    Portamprente

    Suporturi rigide n care se aplic materialele deamprent

    Standard : Metalice , din mase plastice Individuale : Acrilat, compozit, poliesteri

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    Lingur individual

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    g

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    Accesorii pentru amprentare

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    p p

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    Tehnici de amprentare

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    Amprenta n dublu amestecAmprenta de splareAmprenta monofazic n lingur individual

    Amprenta pentru RCRAmprenta bimaxilarAmprenta cu tub de cupru

    nregistrarea ocluziei

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    Etapele amprentrii

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    Alegerea portamprentei i a materialelor deamprentare

    Pregtirea pacientului n vederea amprentrii

    Amprentarea propriu-zis Controlul amprentei Dezinfecia amprentei

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    Amprenta n dublu amestec

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    Este o amprent ntr-un singur timp Utilizeaz un singur material n consistene

    diferite care fac priz n acelai timp

    Tehnica se preteaz pentru siliconi, polieteri,polisulfuri i hidrocoloizi reversibili Vscozitatea celor dou materiale s fie

    apropiat

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    Materialul de amprent se

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    Amprenta n dublu amestecli i ti

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    aplicaie practic

    24-coroan mixt metalo-ceramic 25-onlay MOD 26-coroan parial 4/5

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    Probleme

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    Amprenta de splare (wash-tehnique)

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    tehnique)

    Este o tehnic n doi timpi Se folosesc materiale de consistene diferite

    (chitoas i fluid)

    n primul timp se ia amprent cu materialulchitosn al doilea timp se corecteaz prima

    amprent cu material fluid

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    Etapele

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    Se aplic adezivul pe interiorul portamprentei Se inser firele de retracie Se prepar materialul chitos , se inser n

    portamprent i se ia amprenta Dup priza materialului, se ndeprteaz amprenta

    i se taie zonele retentive, zonele interdentare ale

    marginilor gingivale ale preparaiilor i se creazcanale de refluare Se ndeprteaz firele de retracie Se prepar materialul fluid i se aplic n anul

    gingival i pe preparaie ct i pe materialul chitos

    din portamprent Se aplic portamprenta pe cmpul protetic Se ndeprteaz amprenta dup priz i se face

    controlul acesteia

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    probleme

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    Amprenta monofazic n lingurindividual

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    Stratul de material deamprent este uniform Portamprenta se poate

    poziiona cu precizie

    Portamprentaindividual este maiuor de folosit datoritvolumului sczut

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    Greeli

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    Eviciune gingival incorect (inadecvat, soluii de retraciendeprtate insuficient) Alegerea incorect a portamprentei (dimensiune, retenii) Lipsa deretentivizrii zonelor puternic retentive Utilizarea mnuilor de latex n timpul malaxrii Folosirea materialelor de amprent expirate Omogenizarea incorect a materialului de amprent Prezena salivei sau a sngelui n anturile gingivo-dentare Poziionarea incorect a portamprentei Cantitate insuficient de material n lingur Depasirea timpului de lucru ndeprtarea amprentei naintea prizei ndeprtarea amprentei prin mai multe micri Dezinfecia incorect ( soluie inadecvat, timp)

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    JPD 2005 94 112 7

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    Ruperea materialului de amprentasubgingival

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    Bule de aer

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    Fuga materialului fluid

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    Amprenta pentru RCR

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    Amprenta bimaxilar

    I di ii

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    Indicaii

    Ocluzie stabil ( s existe stop ocluzal distal)

    1-2 coroane solo

    RCR

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    contraindicaii

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    Mai mult de 2 coroane solo Puni Coroane elemente de agregare pentru

    proteze Pacientul nu poate s oclud n IM cu linguran cavitatea bucal Ocluzie instabil

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    Tehnica clasicAmprenta laminar Tehnica H & H

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    Amprenta bimaxilartehnicalaminar

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    Tehnica H & Hhidraulica i hidrofobic

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    Amprenta cu tub de cupru

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    Dezinfecia

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    Soluie deglutaraldehid 2% Spray cu iodoform Pot aprea

    distorsionri aleamprentelor la imersiaprelungit (HC rev iirev sau polieteri)

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    nainte de turnarea modelului

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    Debublizer

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    nregistrarea de ocluzie

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    Reprezint o amprent a feelor ocluzale(margini incizale) ale ambelor arcade aflaten raportul dorit Trebuie s cuprind ct mai muli dini

    Nu trebuie s depeasc ecuatorul clinic Nu trebuie s acopere sub nici o form

    prile moi deoarece acestea reprezint zonereziliente

    Nu trebuie s fie perforat n cazulnregistrrii RC

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    Materiale

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    Cear de ocluzie (Beautypink) Cear cu adaos de pulberi metalice

    (cuprowax) Cear armat cu folie de aluminiu (aluwax) Pastele ZOE-colofoniu pe diferite suporturi Polieteri speciali (Ramitec-ESPE) Siliconi de adiie speciali ( Dimension Bite-

    ESPE, Regisil 2x- DeTrey, KristallOmicrondental, etc.)

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