Materials Base (>6 Small F45)

Front 1

Types

Back 1

1)Co-Cr Alloy

2)Ni-Cr Alloy

3)Ti (Pure Cp Ti) and Ti Alloys

Front 2

Major Elements

Back 2

Co

Ni

Cr

Front 3

-Co Responsible for

- Molybdenum Acts as (as) w Eff on Strength

-Si w Mn act as (as) w responsible for

Back 3

-⬆️ Strength w hardness w E

Co y3ny kolo

- Grain refiner (Iridium)... ⬆️

-Deoxidizers (Zn)... ⬆️ Fluidity w Castability

اتنين مميزين

Front 4

Cr

-Responsible for w By Formation of

-Essay F45 Characters of Passive Layer

-MCQ Minimum w Max

-GR مهم Additional Cr is Avoided

Back 4

- Tarnish and Corrosion Resistance.. . Passive Layer

-thin

-non porous

-uniform

-adherent

-12%... 30%

- Bec it produce Brittle phase known as Sigma Phase

Front 5

Ni

-Responsible for

-Especially responsible for

-its eff is similar to w Lesser or more degree

-MCQ NB :Produce what in some patients w So Advised to use

Back 5

-⬆️ in Strength w hardness w E (zay Co bta3 kolo)

-Ductility

-Co... Lesser

الCo بتاع كله دا عمهم

-Allergic Reaction... Ni - free Co-Cr Alloys

Front 6

MCQ f45

C

-Normal Percent

-combine with other alloying forming

-eff on Strength w hardness w Ductility

-<0.2 % gives

->0.2% gives

Back 6

-0.2 %

-carbide

-⬆️ w ⬆️ w ⬇️

-⬇️ Strength

- too Hard w Brittle

Front 7

MCQ

Al

- in which Type of base

- Al w Ni Form w known as w responsible for

Back 7

-Ni Cr only

-Intermetallic compound ... Nickel-aluminide Ni3Al... ⬆️ in Strength (ppt hardening)

Front 8

Beryllium

بيلي بيلي بلنجهام

-in which Type of base

-eff on melting range w GR MCQ

- Function w As

-eff on Strength

-MCQ May lead to W GR

Back 8

-Ni-Cr only

-⬇️... Bec of formation of Be-Ni Eutectic Alloy (as Ag-Cu)

-⬆️ Fluidity w Castability... Si w Mn

-⬆️

-Lung Fibrosis... Bec it is Carcinogenic

Front 9

Ti

-Responsible for w GR

- if oxide film scratched or abraded so area

افتكر شابتر الimplant

Back 9

-Tarnish and Corrosion Resistance

.. Due to its passivity

-re-passivates within few nanoseconds

Front 10

Prop

ESSAY Enumerate 2 prop

Back 10

-Biocompatibility

-Physical : Density w Melting temp w Color w Resistance to Tarnish and Corrosion w cte w Sag

-Mech : YS w UTS w E w VHN

Front 11

Biocompatibility

- Strong related to

-health hazards مخاطر as w GR

Back 11

-Passivity

-Ni w Beryllium... Allergic w Carcinogenic

Front 12

1)Density MCQ EXAM

- Co-Cr and Ni-Cr has

-Ti has

-Especially useful for

2)Melting Temp

-Most of Time Ti has higher or lower than Co-Cr and Ni-Cr w Kam

3)Color Not Vi

-is

4) Resistance to Tarnish and Corrosion GR

5)Cte not Vi

6) Sag Resistance

- GR less potential to Sag

Back 12

-7 to 8

اضرب اللي تحت دا فيه اتنين و هات الرقمين لللي قبله

-4.5

-construction of large w bulky Maxillary appliances

Higher.... 1700 Ti

Lustrous Silvery white

Due to formation of Passive Layer

-Bec of high melting temp

Front 13

Mech

- which higher, Base or Gold w Co-Cr or Ni-Cr w Ti Alloy or Pure Ti

-MCQ NB :

mech prop of

1) Pure Ti is similar to which Type of gold alloy and base

2)Ti Alloys similar to which Type of gold and base

Back 13

- Base اسم الشابتر ... Co-Cr الطبيعي... Ti Alloy المنطق

1) 3(hard) ... Ni-Cr

2) 4(Extra hard) ... Co-Cr

Front 14

Casting of Co-Cr and Ni-Cr

-should be done in

-What element will be incorporated in Alloy w if incorporated > 0.1 % what obtained

1)Investment :

- What used w with what

2)Melting :

- should done in w what avoided

- can achieved by

- Too much O2 will result in formation of

-Too much Acetylene will Form

3)Casting

-What used w GR

4)Cooling

-Rapid or Bench(slow)

5)Finishing and polishing

- GR مهم

-done by

- Restoration is Anode or Cathode

Back 14

-vaccum under Ar

-N... Brittleness

1)

- C free مهمة اوي PO4 bonded or silicate bonded.... Vents

2)

- Quartz crucible... C crucible

-O2 Acetylene flame

-EMI Electric melting induction

- Undesirable oxides w porosity

-Metal carbides ppt ➡️ Brittle.

3)

-Centrifugal Casting machine... To overcome low density w Low flow

4)

-Slow(Bench) اقعد علي البنش بهدوء

5)

-Bec of their high hardness, they are difficult to finish and polish but retain finished Surface for long time

-sandblasting

-Electrolytic Polishing (opposite to electroplating)

-Anode

Front 15

What is Contraindicated w GR مهم فشخ

Back 15

-Pickling تخليل ... As acid used can attack Passive layer which protects from Corrosion

Front 16

Recasting

-should done or not w GR مهم

Back 16

-Not... Bec of ⬆️ carbide ppt so make it Brittle

Front 17

Casting of Ti

- GR مهم فشخ is highly tech sensitive

-Should be done in w GR

1)Investment

- used what w GR

-its Comp gives oxides more or less stable than TiO2

2) Melting

- By

3)Casting

-By w GR

4)Cooling

-Rapid or Bench

5) Finishing and polishing :

Recasting

-should done or not w GR مهم

Back 17

-Due to

A) Very low density

B) Very high melting temp

C) High reactivity

افتكر الimplant شوية يا اخي

-vaccum under Ar.. Bec it has high Reactivity as if Ti Picks up more O2 so dec strength w ductility

زي الاول يعني

1)

- Phosphate or silicate bonded.. To withstand its high melting temp and to prevent O2 diffusion

-More

2)

-EMI Only

3)

-Centrifugal Casting machine... To overcome low density w low Flow

زي الاول يعني

-Bench زي الأول

As Ni-Cr w Co-Cr زي الأول فشخ

-Not... Due to gas inclusion and carbides ppt formation that makes it Brittle

شبه الأول فشخ

Front 18

MCQ

-computer Shaping of piece of Ti

شبه الCAD-CAM

- SCT

-instead of

Back 18

-Spark Erosion

-Going through very sensitive Casting steps

تجري ورا وجع القلب