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MATERIAL CETAK(IMPRESSION MATERIALS)
Dyah IrnawatiBiomaterial FKG UGM
MATERIAL CETAK ELASTOMERMATERIAL CETAK ELASTOMER
MATERIAL CETAK : NON ELASTIK UNDERCUTS ?? AGAR-AGAR STABILITAS DIMENSI ?? ALGINAT REPRODUKSI DETIL ??
ELASTOMER POLIMER CAIR IKATAN SILANG PADAT Tear resistance & Stabilitas dimensi baik MACAM : Polisulfida, Polieter, Silikon APLIKASI : crown & bridge, inlay, GTS
POLISULFIDAPOLISULFIDA
NAMA : Rubber base, Merkaptan
PASTA BASE Polisulfida
Filler (TiO2 11 –54%)
PASTA KATALIS Pb02
Sulphur Oil (chlorinated parrafin)
REAKSI SETTING :
R-SH + PbO2 + HS-R R-S-S-R + PbO + H2OOksidasi gugus –SH pendant & terminalMODIFIKASI : t butil hidroperoksida menguap Zink karbonant lebih bersih
STRUKTUR POLISULFIDA
C2H5
HS-(C2H4-O-C2H4-S-S) x-C-(S-S-C2H4-O-CH2-OC2H4)y-SH
SH
REAKSI SETTING POLISULFIDA Chain lengthening
HS -------------------- SH HS --- HS-------------- S – S --------- SH S SH S cross-linkingHS --------------------SH HS -------------- S SH S HS -------------------SH HS-----------------SH
MATERIAL CETAK POLISULFIDA
POLIETERPOLIETER
KOMPOSISI
PASTA BASE PASTA KATALIS Polieter Plasticiser Filler
Aromatik sulfonat Plasticiser Filler
REAKSI ikatan silang gugus iminaSIFAT Tanpa hasil samping Dimensi stabilAbsorpsi air simpan di tempat kering
MATERIAL CETAKMATERIAL CETAK POLIETER POLIETER
MATERIAL CETAK SILIKONMATERIAL CETAK SILIKON
MACAM:Condensation Silicone (Silikon Kondensasi)Addition Silicone (Silikon Adisi)
MATERIAL DASAR
Polydimethyl siloxane polymerGugus akhirnya berbedaReaksi setting berbeda
SILIKON KONDENSASISILIKON KONDENSASI
PASTA BASE
Polydimethyl siloxane
( gugus terminal hidroksil )
Filler ( Silika )
PASTA KATALIS
Cross link agent
( alcoxy ortho-silicate )
( organo hydrogen siloxane )
Activator (dibutyl-tin dilaurate)
KOMPOSISI
SEDIAAN : Low & Putty like consistenciesREAKSI SETTING : AO alkohol dimensi ? OS H pitting
MATERIAL CETAK SILIKON KONDENSASI
SILIKON ADISISILIKON ADISI
Reaksi Setting Tanpa hasil samping
PASTA BASE
Polydimethyl siloxane
Silanol
Filler
PASTA REAKTOR
Polyvynil siloxane
Platinum catalyst
Filler
KOMPOSISI
SILIKON ADISISILIKON ADISI
SEDIAAN
TIPE VISKOSITAS
(Nsm-2)
Putty
Heavy bodied
Regular
Light bodied & Wash materials
400 – 700
200 – 300
40 – 150
10 – 70
Tipe Material Cetak
Silikon Adisi