Lec 3 Initiators, Polymerization, Light Curing

Question 1

,A source of any chemical species that reacts with a monomer to form an intermediate compound capable of linking successively with a large number of other monomers into a polymeric compound.

Answer 1

Initiators

Question 2

Single molecule that can form chemical bonds.

Answer 2

Monomer

Question 3

The setting reaction of Bis-GMA and other monomers are achieved when ______________ are released during polymerization

Answer 3

‘free radicals’

Question 4

Are polymerized by application of heat.

Answer 4

Heat cured composites

Question 5

Means chemical initiation converting monomer to polymer takes place.

Answer 5

Self cured composites

Question 6

Means photochemical initiation causes polymerization.

Answer 6

Light cured composites

Question 7

Means chemical initiation is used and combined with photochemical initiation so either and both techniques polymerize composite.

Answer 7

Dual cure

Question 8

4 basic types of dental curing lights?

Answer 8

1. Tungsten halogen
2. Light-emitting diode (LED),
3. Plasma arc curing (PAC),
4. Laser.

Question 9

The two main dental curing lights are?

Answer 9

halogen and LED

Question 10

The most frequent polymerization source used in dental offices.

Answer 10

Tungsten halogen

Question 11

Tungsten halogen is also known as?

Answer 11

Halogen curing light

Question 12

It provides a blue light of about 400 and 500 nm.

Answer 12

Tungsten halogen

Question 13

Tungsten halogen provides a _____ light of about ___ and ____ nm.

Answer 13

• blue light
• 400 & 500 nm

Question 14

This light requires frequent monitoring and replacing of the actual curing light bulb because of the high temperatures that are reached.

Answer 14

Tungsten halogen

Question 15

The time needed to fully cure the material is much more than the LED curing light.

Answer 15

Tungsten halogen

Question 16

Uses light-emitting diodes that produce blue light that cures the dental material.

Answer 16

LED

Question 17

LED stands for?

Answer 17

Light Emitting Diode

Question 18

This light uses a gallium nitride as a semiconductor that is the basis for the blue emission.

Answer 18

LED

Question 19

LED uses a ____________ as a semiconductor that is the basis for the blue emission.

Answer 19

gallium nitride

Question 20

More lightweight, portable and effective because fan is not needed.

Answer 20

LED

Question 21

Can now use rechargeable batteries, making it much more comfortable and easier to use.

Answer 21

LED

Question 22

This technique is recommended to avoid the shrinkage.

Answer 22

Incremental technique

Question 23

These phenomena can lead to internal stresses and stresses at the margins of the restoration.

Answer 23

Polymerization shrinkage

Question 24

As a result of the _______________ process, the liquid or resin is converted into a _______, which results in a density change that reduces the overall volume.

Answer 24

polymerization;
solid