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PROVISIONALRESTORATIONS

DR.MOHAMMADALAMRIPages:225-238

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PROVISIONALRESTORATIONSREQUIREMENTS:

PULPAL

PROTECTION

POSITIONALSTABILITY OCCLUSALFUNCTION EASILYCLEANED

NONIMPINGINGMARGINS

STRENGTHANDRETENTION ESTHETICS

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PULPALPROTECTIONTherestorationshouldbefabricatedinamaterialthatprevents

the

conductionoftemperatureextremes

Marginsshouldbewelladaptedtopreventleakageofsaliva

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POSITIONALSTABILITYTheabutmentteethshouldnotbeallowedto

extrude

or

drift

in

anydirectionSuchmovementwillrequire

adjustment

or

remakeofthefinalrestorationatthetimeofcementation

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OCCLUSALFUNCTIONBeingabletofunctionontheprovisionalrestorationwill:

AidincasediagnosisPreventtoothmigrationSatisfythepatient

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EASILYCLEANEDThematerialandthecontoursoftheprovisionalrestorationmusthelpthepatienttokeepitclean

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NONIMPINGINGMARGINSThemarginsoftheprovisionalrestorationmustnotimpingethegingivaltissueHorizontalandVerticaloverhangsshouldbeavoided

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STRENGTHANDRETENTIONTherestorationmustwithstandocclusalforceswithoutbreakingorcomingoffthetoothTherestorationshouldremainintactduringremovalandrecementation

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ESTHETICS

Theprovisionalrestorationmustprovidegoodcosmeticresultintheappearancezone

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TYPESOFPROVISIONALRESTORATIONMATERIALSThematerialsusedforprovisionalrestorationrangefromzincoxide-eugenolcementforsmallintracoronalinlaytodifferentresinmaterialforfixedpartialdenture

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RESINSFORPROVISIONALRESTORATION

Polymethylmethacrylate Polyethylmethacrylate PolyvinylmethacrylateBis-acrylcompositeresinVisiblelightcured(VLC)urethanedimethacrylate

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Thecharacteristicsofanidealprovisionalmaterialare:1.Convenienthandlingandeasymoldability2.Adequateworkingtime3.Rapidsettingtime4.

Biocompatibility-

Nonallergenic,

Nontoxic,

Nonexothermic

5.Dimensionalstabilityduringsolidification6.Easeofcontouringandpolishing7.Adequatestrengthandabrasionresistance8.Goodappearance-Colorcontrollable,Colorstable9.Goodpatientacceptance-nonirritating,odorless10.Easeofrepairing11.Chemicalcompatibilitywithprovisionallutingagents

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I.

II.

METHODS OF FABRICATION

Prefabricated:Usedforsingletoothrestoratione.g.anatomicmetalcrownforms,clearcelluloidshellsandtoothcoloredpolycarbonatecrowns

Custommade:Usedforsingleandmultiunitfixedpartialdenture

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CUSTOMMADEPROVISIONALRESTORATIONS

Varietyoftechniquesforfabricatingthemouldusedtoformtheoutersurfaceofthecustomprovisionalrestorationwhichprovidestheaxialcontours,theocclusalformandtheproximalcontactwiththeadjacentteethTheinnersurfacewillbeshapedbythepreparation

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CUSTOMMADEPROVISIONALRESTORATIONS

Themouldmaybeformedbyusingdifferentmaterials:1.2.

3.

AlginateElastomericimpressionmaterial

Clearthermoplasticresinmatrix(vacuumformingmachine)

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TECHNIQUES OF FABRICATION

Provisionalrestorationscanbeclassifiedbythetechniqueoffabricationused:A.

B.

C.

Directtechnique:isdoneontheactualpreparedteethinthemouthIndirecttechniqueisdoneonthecastoutsidethepatientmouthCombinationTechnique(indirect-direct)

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Armamentarium

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DIRECTTECHNIQUE

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INDIRECTTECHNIQUE1.Castistrimmed

andfinishlineismarkedwithpencil.

2.Petrolatumjellyorotherseparatingmediumisappliedonthecast.

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INDIRECTTECHNIQUE3.Placethemixedresininthemouldintheareaofthepreparationandtheedentulousareaandalignitaccuratelyonthecast.4.Oncethematerialsets,remove

the

mould

and

separatetheprovisionalFPDfromthecastandstartgrosstrimmingwithacrylicburorcoarseMooresdisc.

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INDIRECTTECHNIQUE5.UseMooressandpaperdisctoopentheinterproximalembrasures.6.Theponticistrimmedwithdiscandburandshapedtobeconicalinshape.

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INDIRECTTECHNIQUE7.Assessthemarginsonthecastoronthedentoform.Additionalacryliccanbeaddedwiththebrush.8.Ifcompleterelineisrequired,itisimportanttogrindthefittingsurfacetoaccommodatetheextramaterial.

9.Checkocclusionwitharticulatingpaperandadjusthighspotswithacrylicbur.10.Polishallsurfaceswithpolishingcompound

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COMBINATIONTECHNIQUE(INDIRECT-DIRECT)

Thistechniqueinvolvesbothindirecttechnique(minimaltoothpreparationonthecastandfabricationofprovisionalFPDonthepreparedcast)and

directtechnique(reliningtheprovisionalFPDinthemouthaftertoothpreparation).

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COMBINATIONTECHNIQUE

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CEMENTATION

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