METAL CERAMICS
METAL FREE CERAMICS www.indiandentalacademy.com
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INTRODUCTION
ESTHETIC DEMAND.
PROVIDE NATURE’S SMILE.
NEWER MATERIALS- CERAMICS.
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METAL MARGIN SHOW. LOSS OF OPTICAL PROPERTIES – OPAQUENESS, LESSER TRANSLUSCENCY. ALLERGIC REACTION TO METAL. www.indiandentalacademy.com
Recent Advancements ALL CERAMICS TO NEWER ALL CERAMICS www.indiandentalacademy.com
CLASSIFICATION: A L L -C E R A M IC S
R e in fo rc in g M a te ria l
G e n a ra l S y s te m
F irin g T e m p e ra tu re
A l u m in a
M a g n e s iu n s p in e ll
P o w d e r s lu rry
C a s ta b le
H ih g F u s in g
Z irc o n iu m
L e u c ite
P re s s a b le
In fi l tra te d
L o w F u s in g
Z i r c o n i a W h is k e rs
H ig h A lu m i n a
M a c h in a b le www.indiandentalacademy.com
M e d iu m F u s in g
ACCORDING TO EVOLUTION: OLDER ALL CERAMICS: Dicor,Cerestore NEWER ALL CERAMICS: Inceram,IPS Empress II,Machinable ceramics
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ACCORDING TO STRENGTHENING MECHANISM Crack Tip Interaction: Obstacles In The Micro Structure Impede Crack Motion By Reorienting Or Deflecting The Plane Of Fracture.
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CRACK TIP INTERACTION e.g. A. Leucite Crystals Reinforced. I. Optec H S P.(Jeneric/Pentron) Ii. Finesse.(Dentsply) Iii. Ips Empress I.(Ivoclar) B. Aluminium Oxide. I. Hiceram.(Vita Zahnfabrik) www.indiandentalacademy.com
C. Alumina
I. Inceram Alumina(Vita Zahnfabrik) D. Magnesium Aluminate I. Inceram Spinell(Vita Zahnfabrik) E. Lithium Di Silicate Crystals I. IPS Empress II (Ivoclar) www.indiandentalacademy.com
ď Ź
CRACK TIP SHIELDING:
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Events triggered by the high stresses in the crack tip region act to reduce the stress (ie) the transformation toughening and microcrack toughening. www.indiandentalacademy.com
CRACK BRIDGING:
Second Phase Crystalline Structure Acts As A Bandage To Prevent A Crack From Opening Further.
A. Tetra Silicic Fluoro Mica CrystalsDicor(dentsply) B. Hydroxy Apatite Crystals- Cerapearl. (Kyocera) C. Alceram.(Cerestore) www.indiandentalacademy.com
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ALUMINA ZIRCONIA SPINELL
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INCERAM (VITA ZAHN FABRIK)
RESEARCH By-Dr.Mickael Sadoun(1985)
Class-interpenetrating Phase Composites
Two Phases-lanthanum Alumino Silica Glass And Core Of Reinforcing Materials www.indiandentalacademy.com
INCERAM ALUMINA
90% Alumina Densely Packed Alumina Crystals-limit Crack Propogation. Glass Infiltration –Eliminates Residual Porosity.
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INCERAM ZIRCONIA 33% Partially Stabilized Zirconia. Greater Flexural Strength, Fracture Toughness,fatigue Resistance.
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INCERAM SPINELL
Reinforcing Crystals-magnesium Aluminate. More Translucent.
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LABOROTORY PROCEDURE www.indiandentalacademy.com
MASTER DIE
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DUPLICATION OF THE DIE
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DUPLICATED DIE
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APPLICATION OF SLIP
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SINTERING FIRING
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SINTERED SUBSTRUCTURE
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CORE INFITRATED WITH GLASS
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GLASS INFITRATED CORE SUBJECTED TO FIRING IN VACUMAT
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FINISHED SUBSTRUCTURE
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LAYERING WITH VEERING PORCELAIN
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FINISHED RESTORATION
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IPS EMPRESS II Densely Arranged Lihtium Disilicate Crystals In A Glassy Matrix. Lithium Orthophospate Crystals As A Secondary Crystalline Phase Pressing Behaviour Of Empress Ii Differs From Empress .I
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WORKING CAST WITH WAX UP RESTORATION
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Final Wax Up For Layering Technique
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ATTACHMENT OF SPRUE AND INVESTING
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PREHEATING DONE
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PLACEMENT OF INGOT
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RING PLACED IN PRESS FURNANCE
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FINISHED CORE
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LAYERING PORCELAIN APPLIED
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FINISHED RESTORATION
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CERAMIC BLOCKS USED FOR MACHINABLE CERAMICS
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VITA MARK II ď Ź
Sanidine (k Al Si3 O8) in a glassy phase.
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DICOR MGC
70 vol% crystalline phase arranged in a unique “House of Cards”
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ProCAD IVOCLAR
Leucite containing ceramic refered to as “Empress on Stick”
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Vita IN-Ceram Blanks (Vita Zahnfabrik): Inceram
alumina Inceram zirconia Inceram spinell
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INCERAM ALUMINA
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INCERAM ZIRCONIA
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SPINELL BLANKS
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