Dental Mat. Flashcards by btp_

Requirements, purpose of the Intermediate Restoration

Esthetic, economicql,dimensional Stable, insoluable
Purpose= Maintain tooth position and prevent occlusal changes, esthetic, prevent gingival inflammation

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gold standard material

Zinc phosphate cement

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oldest and most widely used cements,

Zinc phosphate cement

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Zinc phosphate cement powder and liquidi

powder are zinc oxide and magnesium oxide
Liquid = phosphoric acid and water

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Which cement is not suitable for use in deep cavities close to pulp.

Zinc phosphate cement

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Lack of anticariogenic effect, low pH

Zinc phosphate cement

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Rest. Material volume fazla olursa ne olur?

Dim. Change
Polimerizasyon
Pressure. Bu yüzden CEMENT kullanılır

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Zinc oxide C.in powder liquidinin reaktivitesini azaltır
Act as buffer

Alimunium-zinc

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Zinc oxide
Low temp. Longer working time
Bu avantaj neden?

It allows incorparation of Power and liquid
so it lead to greater compressive stength and lower solubility

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Why powder shoul be divide into increments

Slow neutralization
Control reaction

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While setting of cement is taking place, water
contamination should be avoided. If it contaminate, What will happen?

If water cont. Ocurs befıre cement hardened, cement loose chemical properties.
Phosphoric acid leaches out and solubility increases

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Geçici rest. 6 haftada çıkarılmazsa nolur

Hypersensitivity

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Anestezik özelliğe sahip tek cement

Eugenol

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Asit baz reaction cement

Zinc phosphate

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Sedative effect, better marginal seal

Zinc oxide eugenol

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Base material olarak eugenol kullanılmaz. Resinleirn altına glass ionemer ve ca hidroksit

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reaction progresses more rapidly in humidconditions.

zinc eugenol

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one of the most soluble cements.

Eugenol

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: To improve the strength of setting mat. İnTo liquid of zinc
oxide eugenol cements

EBA (Ortho-ethoxybenzoic acid) cement

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PH=2 pH=7 cement

Zinc phosphate, zinc oxide eugenol

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Eugenol do not adhere well to enamel or dentin

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Suitable for deep cavities

Eugenol, ca hidroksit

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Hangi materyalin dezavantajları=
Highly soluable, low strength, low setting time, low compressive strength olmasıdır

Eugenol

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Least irritsting cement
Most palliative agent to pulp
Soothing effect (obtundent)

ZOE

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ZOE cements should not be used as a base under resin-based fillers- composites. Çünkü Resini yumuşatır

It was one of the first chemically adhesive dental material

Zinc Polikarboskilat

Powder liquid arası asit baz reaksiyonu veren=

polikarboksilat, zinc phosphate

Diğer adı Polyacrylate cement Liquid=polyacrylic acid Powder=zinc oxide, magnesium oxide

Zin Polycarboxylate cement

Polycarboxylate cementin anticariogenic effects yok

Hangi cement ortodontide kullanbılabilir

Zinc Polycarboxylate Adhere metal excellent

Porselen hangi materyalde tercih edilmez

Zinc Polycarboxylate

.why zinc Polycarboxylate shows excellent biocompatibility?

The size of polyacrylic acid molecule is bigger, this makes it less favorable to disperse into the dentinal tubules The pH of the cement rises more rapidly when compared to that of zinc phosphate

Silicate Cem. Hangi materyallerin geliştirilmesini sağlar?

Glass ionemer Composite resin

Which cements are not used nowadays

Silicate cement Zinc silicophosphate cement

.Dezavantaj = There was a space between material and tooth. -Stained -İrritant to pulp. Due to low pH -radiolucent -soluable -Thermal expansion coefficient is close to enamel tissue. Avantaj= anticaiogenic effect -Translucent. İnitial esthetics is good

Silicate cement

Powder; acid soluble silicate, zinc and magnesium oxides. Liquid; is phosphoric acid.

Zinc silicophosphate cements

Translucent and more esthetic than zinc phosphate cement Anticariogenic because of fluoride release Has sufficient strength. Dezavantaj= Soluable

Zinc Silicophosphate Cements

Stone cement

Zinc silicophosphate

Suspensions of zinc oxide ör calciumhydroxide in alcohol or chloroform

Cavity liners

Thin film on prepared tooth surface, sharp smell

Cavity liner

Not mechanical resistance Can not provide heat insulation( so is not used under amalgam filling * Melts in mouth fluids. Soluable Hypersensitivityi azaltır

Cavity liner

Thin Resin film

cavity varnish

Hangi material amalgamın dentinal tubule e girmesini engeller

Cavity varnish, it serves as a barrier between the restoration and the dentinal tubules.

Cavity Varnish hangi maddelerle kullanılmamalı

Composite resin Glass ionemer

Should not be used in cavitated carious lesions, but can be used to remineralize white spot lesions

Flor varnish

PH=11cement

Calcium hyroxide

Relatively Weak cement used as pulp capping

Calcium hydroxide

Dycal,(paste form of calcium hydroxide) shallow cavityde kullanılır mı?

Hayır, deep cavityde

Applications 1. For pulp capping. 2. As low strength bases beneath restorations for pulp protection. 3. Apexification procedure in permanent teeth where root formation is incomplete. 4. In the treatment of root canal

Calcium hydroxide

Poor mechanical properties Low compressive tensile strength High Solubility

Calcium hydroxide

Formation of tertiary dentin: antibacterial and protein lysing effect helps in the formation of reparative dentin. .

Calcium hydroxide

Texture friend PH=11 Hemostatic effect Pulp capping agent

Calcium hydroxide

Criteria for pulp capping agent

-pulp should be healthy -exposure 0.5mmden fazla olmamalı -this tooth should be isolated

If perforation is small= There is no perforation, near to pulp=

Direct pulp capping Indirect

Resinlerin altına öjanol base mat. Olarak kullanılmaz. Glass ionemer ve Ca hidroksit base mat olarak kullanılır. Çünkü çok soluable ve resin polimerizasyonuna müdahale eder.

Öjanol kısa dönem zinc phosphate uzun dönem için iyi. Öjanol low strength, zinc phosphate high strength

Major element in amalgam Decreases creep Reducing fluency Diğer her şeyi artırır İncreases tarnish resistance

Silver

Controls the reaction between silver and mercury Facilitates amalgamation Diğer her şeyi azaltır

Tin

Amalgamda tin olmasa ne olurdu

Reaction would be so fast

Amalgamın sert olmasını sağlar -stifness Resolution is low

Copper

Deoxidizer Give more plastic property to amalgam. … sız amalgam less plastic Easy machining alloy

Zinc

Creepi azaltanlar

Palladium indium silver

İncrease corrosion resistance in amalgam Amalgamın mekanik özelliklerini arttırır

Palladium

Reduces mercury vapor Reduces early strength

İndium

Hg miktar Excessive mercury causes…

43-50 Expansion

Gamma 2 phase weakest copper eklenir

Mixing amalgam powder with mercury

Trituration

a continuation of trituration. It improves the homogeneity of the mass and get a single consistent mix.

Mulling

Aims of condensation

1. To compact the mass to increase the density of the restoration. 2. To reduce voids. 3. To remove excess mercury. 4. To adapt the amalgam to the preparation walls .

Function of burnishing

After carving or before it smoothes restoration

Function of polishing Polish yapılmazsa nolur

Polishing prevents plaque accumulation and minimizes corrosion. Paste formda yapılmalı

Advantage of … Physical and mechanical performance is better than unfilled acrylic resins. Disadvantages: Rough surface finish Poor polishibility More wear ® More prone to staining.

conventional composite:macrofi

Microfil resin dezavantaj.

Poor mechanical properties due to more matrix content Poor color stability Low wear resistance Less modulus of elasticity and tensile strength More water absorption High coefficient of thermal expansion.

hybrid composites dezavantaj.=

Disadvantages of hybrid composites # Not appropriate for heavy stress bearing areas # Not highly polishable as microfilled # Loss of gloss occurs when exposed to abrasive toothpaste.