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lure of

ental Restorati

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De nition :

It is Inability or inadequacyofa dental restoration or

prosthesis to perform asexpected.

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What is Success ?

he criteria of success of a dentalrestoration include :

Restoration remains inte!ral and in place.

"bsence of recurrent #aries.$ar!inal accuracy and adaptation.%erfect aesthetics.$aintain perfect anatomy and relations&ith nei!hborin! and opposin! teeth andperiodontal Structures.%atient comfort and satisfaction .

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'eneral #auses of Failure :

#auses of failure can be listed aseitherinherent factors or induced factors :

() Inherent Factorsou!h conditions in the oral ca*ity:Di+erent ypes of Stress.

emperature ,uctuations.%- #yclin!.-umidity.$icro)or!anisms.Shelters and sta!nation areas

#auses of failure can be listed aseitherinherent factors or induced factors :

() Inherent Factorsou!h conditions in the oral ca*ity:Di+erent ypes of Stress.

emperature ,uctuations.%- #yclin!.-umidity.$icro)or!anisms.Shelters and sta!nation areas

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'eneral #auses of Failure :

) Induced Factors$is/ud!ment in selectin! the correctrestorati*e material.

Incorrect desi!n of ca*ity preparationImperfect manipulation of therestoration .

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Failure ofDentalcomposite

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#auses of composite failures :

(. Incomplete remo*al of carious lesion. incomplete etchin! or incomplete remo*al of residual

acid from tooth surface

0. 1xcess or de cient application of boundin! a!ent .

2. 3ac4 of moisture control .5. #ontamination of composite &ith n!er 6 sali*a .

7. follo&in! bul4 placement technique durin!polymeri8ation of composite .

9. Improper polymeri8ation method .

. Incomplete nishin! and polishin! of composite .

;. Inadequate occlusion of restored tooth .

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Follo&in! failures are commonly seen incomposite restoration &ith time :

#auses of composite failures :

Discoloration

Secondary carie s

'rossfracture of

restoration

%ostoperate

sensiti*ity

Fractureof

mar!ins

3oss of

contact

"ccumulation of

plaque

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'uideline to minimi8e compositefailure :

(. he tooth preparation should be 4ept as small aspossible since composite in bul4 lead to failure .

. "*oid sharp internal line an!les =&hich increase stressconcentration.

0. Deeper preparation should be !i*en base of #"> -@ or

'I cement.2. Strict isolation is to be follo&ed.

5. "*oid inadequate curin! =since it lead hydrolyticbrea4do&n of composite.

7. Ase small increments= holdin! each increment &ithe,on coated instruments.

9. Fill proximal box separately and create proper contactareas .

. #omposite =especially at be*eled areas =should benished and polished properly.

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Repairin! composite restorations :

Restoration is indicated for replacement&hen any of follo&in! occurs :

Secondary caries &hich cannot be remo*eddurin! repair procedure.

Beed for aesthetics.

%resence of pulpal patholo!y

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#onclusion :

(. he criteria of success of a dentalrestoration include many factor

.#auses of failure can be listed as either0.inherent factors or induced factors

2.Failures in amal!am restoration are notusually because of poor material5.Durin! ca*ity preparation the failure occuar

at *arious step

7. he tooth preparation should be 4ept assmall as possible since composite in bul4lead to failure

9.#omposite =especially at be*eled areas=should be nished and polished properly.

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