Wires

Question 1

What do archwires generate?

Answer 1

Biomechanical Forces through the bracket to effect tooth movement

Question 2

What is an role of the archwire?

Answer 2

To act as a track for the teeth to move along and provide a pattern for the shape of the arch

Question 3

How are the forces exerted by the wires?

Answer 3

By being engaged in the bracket slot

Question 4

What are stages wires are used for?

Answer 4

• levelling and aligning
  *overbite/overjet reduction
  *space closure
  *finishing and detailing
  *Retention

Question 5

7 main properties of Archwires

Answer 5

1. Springback
2. Stiffness
3. Formability
   4.Resilence ( energy stored)
4. Biocompatibility ( non allergic)
5. Joinability ( soldered/welded?)
   7.Frictional Characteristics

Question 6

Name the 4 materials used for Archwires

Answer 6

1. Stainless Steel
2. Nickel Tintanium
3. Beta Titanium
4. Colbalt Chronium

Question 7

Describe Metal alloys

Answer 7

Compounds composed of two or more elements

Question 8

Metal alloys are mixed in what state?

Answer 8

Molten State

Question 9

Stainless steel is an alloy of…

Answer 9

Iron
Nickel
Chronium

Question 10

What does TMA stand for?

Answer 10

Titanium Molybdenum Alloy

Question 11

What is TMA an alloy of?

Answer 11

Titanium
Molybdenum
Zirconium

Question 12

What two properties do NiTi wires have?

Answer 12

• Super elasticity
• Thermal shape memory

Question 13

What is the alloy of NiTi?

Answer 13

• Nickel
• Titanium

Question 14

What is the characteristics of Nickel in a NiTi wire?

Answer 14

• Hard
•Brittle

Question 15

What stage of treatment are NiTi wires used for?

Answer 15

• levelling and aligning

Question 16

What time frame does movement occur with NiTi wires?

Answer 16

Long period of time

Question 17

Describe the two stages of thermal activity in a NiTi wire?

Answer 17

•Martenistic - soft @ room temp
•Austenitic - hard @ body temp -Active

Question 18

What are the alloys of Copper Nickel Titanium?

Answer 18

• Copper - temp sensitive
• Nickel - hard and brittle
• Titanium - strong and light

Question 19

Characteristics of a Copper Nickel Titanium?

Answer 19

• used for levelling and aligning
• self ligation
• very flexible
• low friction
• temperature sensitive

Question 20

If a Copper nickel Titanium wire is martenistic what is it?

Answer 20

Soft @ room tenp

Question 21

If a Copper Nickel Titanium is Austenistic what is it?

Answer 21

Hard @ body temp = active

Question 22

What are the three temperatures of a Copper Nickel Titanium

Answer 22

27 - mouth breather
35 - body temp
40 - hot drink

** ALL ACTIVE **

Question 23

What quality does chronium have in a Stainless Steel wire?

Answer 23

Less corrosive

Question 24

What quality does nickel have in a Stainless Steel wire?

Answer 24

Hard and brittle

Question 25

Features of a Stainless Steel wire?

Answer 25

• takes perm set
• used for overjet/ overbite correction and space closure
• short period of movement = discomfort

Question 26

What stage of trt are TMA wires used for?

Answer 26

Detailing and finishing

Question 27

TMA wire characteristics

Answer 27

• combination of SS and NiTi= takes perm set but is flexible
• High Friction

Question 28

What are the characteristics of Colbalt Chronium - Elgiloy

Answer 28

• High Friction
• Bends and Retains
• lab made
• heat activated
• different shapes - square, reverse curve
• used for hooks, arches and quads