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Flashcards in Final sweep Deck (18):
1

Types of pins

cemented, friction locked, threaded

2

--- pin diameters inside dej

2

3

• Ionomers need a

clean intact dentine surface with exposed mineral
• Ionomers attach by chelating with HA surfaces (metal ions)

4

• Adhesives need a

demineralized dentin surface with exposed collagen
• Hybrid layer

5

GI rxn -
• Next 24 -72 hours •

Al+3 replace Ca+2 • Increase strength • F- released

6

Collimated –

Laser energy travels in a straight line because all the photons are moving in the same direction.

7

Active medium

name and wavelength of laser. May generate more than 1 wavelength

8

Power density =

Watts/cm2

9

Joule

unit of energy - ability to do work

10

Watt

unit of power - rate of doing work

11

Free-Running Pulse Mode –

Extremely short pulses and relatively long thermal relaxation periods allow target tissue to remain cool. Often, Free-Running Pulsed lasers use a mixture of air and water to assist in cooling of tissues.

12

Continuous Wave Mode –

The laser is ‘on’ as long as the foot pedal
is pressed. This mode creates ‘hot’ laser energy and thermal damage.

13

 Gated or Chopped Pulse Mode -

There is a period of thermal relaxation between pulses when the laser is ‘off.’ This allows target tissue to warm more slowly that Continuous Wave Mode.

14

Chart info for lasers:

Fiber size, tip shape and size, emission mode, power/energy settings, exposure time

15

Diode Lasers

SemiconductorLaser
• 810-980 nm
• Near-Infrared portion of the Electromagnetic Spectrum
• Soft-Tissue, Low Level Therapy & Laser Whitening
• Highly absorbed by pigment
• Usedincontactornon-contactmode

16

Nd:YAG Lasers

• Solid State Laser – Crystal
• 1064 nm
• Near-Infrared portion of the electromagnetic spectrum
• Soft-Tissue Only
• Highly absorbed by pigment
• Used in contact or non-contact mode

17

Erbium Lasers

• Solid State Laser – Crystal
• 2780 nm – Er,Cr:YSGG
• 2940 nm – Er:YAG
• Mid-Infrared portion of the Electromagnetic Spectrum
• Absorbed by Water and Hydroxyapatite
• Extremely short pulse (millionths of a second!)
• Minimal heat transferred to hard and soft tissue

18

CO2 Lasers

Gas Laser – CO2 Gas
10,600 nm (10.6 μm)
Far-Infrared portion of the Electromagnetic Spectrum
Soft-Tissue Only
Absorbed by Pigment, Water and Hydroxyapatite
Extremely short pulse