Alloi Metal-Ceramic Alloi Metal-Ceramic utk Prosthetikutk Prosthetik

PengertianPengertian

Logam paduan untuk bangunan prostetik yang Logam paduan untuk bangunan prostetik yang mampu mengikat keramik dengan ikatan kimiawi mampu mengikat keramik dengan ikatan kimiawi dari hasil difusi -jerapan lapisan tipis oksida antara dari hasil difusi -jerapan lapisan tipis oksida antara logam paduan dengan keramik dengan tujuan logam paduan dengan keramik dengan tujuan utama estetikautama estetika

Dalam PFM terdiri 3 substansi yang saling Dalam PFM terdiri 3 substansi yang saling berikatan secara kimiawi yaitu logam, lapisan tipis berikatan secara kimiawi yaitu logam, lapisan tipis oksida dan keramik oksida dan keramik

CerM MO

Kegunaan alloi dengan porselin difusi dalam logamKegunaan alloi dengan porselin difusi dalam logam(PFM)(PFM)

Bangunan restorasi dengan veneer-porcelainBangunan restorasi dengan veneer-porcelain

Restorast all-metalRestorast all-metal

Implant deviceImplant device

Orthopaedic deviceOrthopaedic device

EstetikaNon corrosive

Jenis materialJenis material

High Noble Alloy (contoh: Gold alloy)High Noble Alloy (contoh: Gold alloy)

- Gold-palladium-platinum alloy- Gold-palladium-platinum alloy

- Gold-palladium-silver alloy- Gold-palladium-silver alloy

- Gold-palladium alloy- Gold-palladium alloy

Noble Alloy (contoh: Palladium alloy)Noble Alloy (contoh: Palladium alloy)

- Palladium-silver alloy- Palladium-silver alloy

- Palladium-gallium-silver alloy- Palladium-gallium-silver alloy

- Palladium-gold alloy- Palladium-gold alloy

- Palladium-gold-silver alloy- Palladium-gold-silver alloy

- Palladium-copper alloy- Palladium-copper alloy

- Palladium-cobalt alloy- Palladium-cobalt alloy

Base Metal Alloy (contoh )Base Metal Alloy (contoh )

- Nickel – chromium alloy- Nickel – chromium alloy

- Nickel – chromium- berrylium alloy- Nickel – chromium- berrylium alloy

- Cobalt – chromium alloy- Cobalt – chromium alloy

- Cp Titanium- Cp Titanium

- Titanium-aluminum-vanadium- Titanium-aluminum-vanadium

Persyaratan khusus PFMPersyaratan khusus PFM

Temp. melting alloi hrs lbh tinggi dp firing tempe-Temp. melting alloi hrs lbh tinggi dp firing tempe-rature keramikrature keramikMampu menahan creep atau sag pada suhu Mampu menahan creep atau sag pada suhu melting alloi / firing temperatur keramikmelting alloi / firing temperatur keramikKoef. ekspansi termal (CTE) compatibel thd Koef. ekspansi termal (CTE) compatibel thd porselinporselinMampu mengikat porselinMampu mengikat porselinMemp. stiffness tinggi (adanya flexing dari alloi Memp. stiffness tinggi (adanya flexing dari alloi menyebabkan porselin frakturmenyebabkan porselin frakturTidak boleh ter stain atau discolorationTidak boleh ter stain atau discoloration

Sifat khusus High Noble Alloys PFMSifat khusus High Noble Alloys PFM

Melting range: 1149 – 1304 CMelting range: 1149 – 1304 C

Density : 13.5 – 18.3 gr/cm3Density : 13.5 – 18.3 gr/cm3

Castability : easy to castCastability : easy to cast

Hardness & workability : 182 – 220 VHN, Hardness & workability : 182 – 220 VHN, extremely easy to workextremely easy to work

Percent elongation : 5 – 20%Percent elongation : 5 – 20%

Porcelain bonding :oxide layer assists in chemical Porcelain bonding :oxide layer assists in chemical bondingbonding

Sag resistance : to withstand temp. of as high as Sag resistance : to withstand temp. of as high as 950 C950 C

Sifat khusus Noble Alloys PFMSifat khusus Noble Alloys PFM

Melting range : 1155 – 1304 CMelting range : 1155 – 1304 C

Density : 10,5 – 11,5 gr/cm3Density : 10,5 – 11,5 gr/cm3

Castability :do not cast as well than high nobleCastability :do not cast as well than high noble

Hardness & workable : 189 - 270 VHN, Hardness & workable : 189 - 270 VHN, extremely easy to workextremely easy to work

Percent elongation : 10 – 34% Percent elongation : 10 – 34%

Porcelain bonding : with base metal (Sn, In, etc) Porcelain bonding : with base metal (Sn, In, etc) are added to assists porcelain bondingare added to assists porcelain bonding

Sag resistance : similar with high nobleSag resistance : similar with high noble

Sifat khusus Base Metal Alloys Sifat khusus Base Metal Alloys

Melting range : 1155 – 1304 CMelting range : 1155 – 1304 C

Density : 7.8 – 8,4 gr/cm3Density : 7.8 – 8,4 gr/cm3

Castability : extremely technique sensitiveCastability : extremely technique sensitive

Hardness & workable : 175 – 360 VHN, extremely Hardness & workable : 175 – 360 VHN, extremely difficult to work withdifficult to work with

Percent elongation :10 – 28%, but not easily Percent elongation :10 – 28%, but not easily burnishableburnishable

Porcelain bonding : an adequate oxide layer is essential Porcelain bonding : an adequate oxide layer is essential for successful porcelain bondingfor successful porcelain bonding

Sag resistance : far more stable at porcelain firing Sag resistance : far more stable at porcelain firing temperaturetemperature

2 jenis ikatan utama: 2 jenis ikatan utama: - - chemical bondingchemical bonding

across the porcelain – metal interfaceacross the porcelain – metal interface

- pada Base metal melalui - pada Base metal melalui chromic oxidechromic oxide

- pada Noble metal melalui - pada Noble metal melalui tin oksida and tin oksida and iridium oksida dlliridium oksida dll

- - Mechanical interlockingMechanical interlocking

between porcelain and metal (nodules)between porcelain and metal (nodules)

Perlekatan logam pada porselin pada PFMPerlekatan logam pada porselin pada PFM

Pd-Ag alloy Porcelain

Hybrid layer PFM

4 µm 1 µm

nodules

Mechanism Bonding of PFMMechanism Bonding of PFM

1. 1. Chemical bondingChemical bonding (oxides) (oxides)

2. 2. Mechanism entrapmentMechanism entrapment (nodules) (nodules)

3. 3. van der Walls forcevan der Walls force

4. Compressive force (physical)4. Compressive force (physical)

DiscolorationsDiscolorations

Greenish-yellow discoloration …….. Greenish-yellow discoloration …….. high Aghigh Ag - - galium, geranium (2-9%)galium, geranium (2-9%)

Greenish ………………………………..Greenish ……………………………….. Cr CrDark brown – black ………………….. Dark brown – black ………………….. CuCuDark ……………………………………. Dark ……………………………………. CoCo

- galium, boron- galium, boronDark- greyDark- grey …………………………….. Ni …………………………….. Ni

Opaque materialsOpaque materials

Discolorasi ditutup dengan

Anusavice KJ, 2003 Phillips’ Science Dental Anusavice KJ, 2003 Phillips’ Science Dental Materials, Saunders, USAMaterials, Saunders, USA

Manappallil JJ, 2003 Basic Dental Materials, Manappallil JJ, 2003 Basic Dental Materials, Jaypee Brother Pub, New DelhiJaypee Brother Pub, New Delhi