Light cure ppt
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Transcript of Light cure ppt
DENTAL CURING LIGHTDEVELOPMENT &
PRODUCTION
Introduced to:::::: Dr / Ahmed Farag
1_Objective In Quantitative and Qualitative Manner
1 _Decrease number of components.
2 _Make the device more comfortable for doctor and patient, beautiful and small for easy used.
3 _Use a suitable chargeable battery..
4_ Reduce the cost of the device.
2_TIME TABLELightCur
eTASKS START FROM END
Analyzing the product in the market .
20/9/2012 29/9/2012
Reverse engineering. 1/10/2012 20/10/2012
Ideas for developments and the final addition and shape for project.
20/10/2012 25/12/2012
DENTAL CURING LIGHT
Usage of device:
Dryness of the white composite for teeth by using laser blue led.
What is the Composite?It is A mixture of plastic and fine glass particles.
Used for: Small and large fillings, especially in front teeth or the visible parts of teeth; also for inlays
Lasts: At least five years
PRODUCT IN THE MARKET-:
After asking Maintenance Engineer and searching in many sites about device and its real components we know that:
A dental curing light is a piece of dental equipment that is used for polymerization of light cure
There are two main dental curing lights are the halogen and Blue LED.
1.Old Light Cure
Operates with halogen lump.
Disadvantage: consume high power.
PRINCIPLE OF TUNGSTEN HALOGEN
In order for the light to be produced, an electric current flows through a thin tungsten filament, which functions as a resistor.
This resistor is then “heated to temperatures of about 3,000 Kelvin, it becomes incandescent and emits infrared and electromagnetic radiation in the form of visible light”.
It provides a blue light of about 400 and 500 nm, with an intensity of 400- 600 mW cm^-2.[
2.Using Blue Led
is most widely used .
2.1wireless:
Disadvantages: the chargeable battery is weak.
2.2hand with adaptorWireless Light Cure
better than the wireless
PRINCIPLE OF USING BLUE LED
it uses light-emitting diodes that produce blue light that cures the dental material.
This light uses a gallium nitride as a semiconductor that is the basis for the blue emission.
“In LED’s, a voltage is applied across the junctions of two doped semi- conductors (n-doped and p-doped), resulting in the generation and emission of light in a specific wavelength range.
By controlling the chemical composition of the semiconductor combination, one can control the wavelength range.
PRINCIPLE OF BLUE LED: The dental LED curing lights use LED’s
that produce a narrow spectrum of blue light in the 400- to 500-nm range (with a peak wavelength of about 460nm), which is the useful energy range for activating the CPQ molecule most commonly used to initiate the photopolymerization of dental monomers.
These curing lights are much different than the Halogen curing lights.
They are more lightweight, portable and effective.
PRINCIPLE OF BLUE LED:
The heat generated from LED curing lights is much less which means it does not require a fan to cool it. Now that the fan is not needed, a more lightweight and smaller light could be designed. The portability of it comes from the low consumption of power.
The LED can now use rechargeable batteries, making it much more comfortable and easier to use
SYSTEMS OF THE DEVICE-:
1. Continuous lightning for 15 sec.
2. Pulsed lighting every sec for 15 sec.
3. Graduate increasing in light intensity for 15 sec. These multiple systems are found, because of the theory, which says that when the composite material is exposed to light directly, it expands and cracks .
prices Type of the device
500-1000L.E. Chinese device
1300 L.E Korean device
reach 4000 L.E. German device
300 L.E. China wholesale device
800 L.E. The latest device with lens to measure the wavelength
•Prices of the device in the market-:
Famous damages in-:
1) Led.
2) Board.
3) Battery in wireless .
Our Work:-the added value from point x to y
Development went in two directions: A – low cost(remember the price of it ' ' pounds) and redesign the shape of the cover.B - for electronic circuit:1 - safer2 - Replace the 3 resistors, 3 LED with 2 one LED (tri-color)
Technical Specifications Rating Voltage: 220 volt or battery : 9 volt .
50-60 Hz , 1 A (for adaptor) . OutPut Of 5.0 VDC . Built in Battery is an Li-on type with 3.6 V-DC and
a capacity of 700 Mah It has the optical wavelength of 430 – 470
nm ,with flux intensity of 1,000 W/cm2 . With push of the button , it also includes 3
modes setting continous,pulsed,,gradually)
Advantages
Light in weight Easy to handle
Convenient to control
Device Can Be Operated Either by battery or AC 220volt.
Instrument Function Harden of the white composite for teeth by using light blue
led . visible spectrum output (lights)that lies within a specific
wavelength range . The idea is that the setting catalyst contained by this
particular color (wavelength) of light. Actually dentist use curing lights to activate the set of a wide
range of different types of dental materials. With most dental products including most dental composites
the light wavelength needed to activate the curing process lies somewhere within the range of 420 to 450 nm .
This means that the light emitted from the typical dental curing light will have a violet to blue coloration
1. BLOCK DIAGRAM
Power ct.It will be Battery or Adaptor.
• Power 5v
• Micro Controller Circuit
• Blue Led
COMPONENTS:
1. Power Switch.2. Power Indicator Led(Tri led).3. Restart Switch.4. Mode1 Button.5. Adaptor.6. LCD.7. UV Light LED Arm.8. UV Light LED.9. OK Button.10. Analogue out (RS232).11. SDPD switch.
COMPONENTS AND IT'S SPECIFICATIONS :
1. BLUE LED :
has the optical wavelength of 430 – 470 nm ,with flux intensity of 1,000 W/cm2
Cost: 150 L.E
2.PIC 16F628AProgram Memory 2048x14
RAM (Bytes) 224
EEPROM Data (Bytes) 128
Max Speed (MHz) 20
I/O 16
Package 18-pin DIP
Comparators 2
PWM Channels 1
Brown Out Reset Yes
Serial I/O AUSA-RT
Cost:
30 L.E.
Used as indication led for 3 modes of device.
cost : 100 piaster
Tri-Color LED (Red/Green)
10KΩ:RESISTORS
• (1/4 W)
• Cost:
25 Piaster
REGULATOR “7805”:
Output Current up to 1A Output Voltages of 5 Thermal Overload
Protection Short Circuit Protection Output Transistor Safe
Operating Area Protection.
Cost:
50 pcs.
330 Ω:RESISTORS
(1/4W).
Cost:
0.05 L.E
ADAPTOR :
DC 5V 1A Switching Power Supply adapter 100-240 AC.
Cost: $2.60
LCD DISPLAY: We used Lcd “ 2*16 ”For displaying which mode is chosen .
Cost : 30 L.E.
CRYSTAL OSCILLATOR (4MHZ): A crystal oscillator is an
electromechanical component for an electronic osillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency.
This frequency is commonly used to keep track of time (as in quartz wristwatches ), to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.
Cost: 3.00 L.E
CAPACITORS :
2 capacitors of 22 micro-Farads (µF) .
Cost : 1 L.E.
PUSH-TO-MAKE SWITCHES:
3 switches for 3 modes of device.
Switch for power(spdp)
1 for on/off for device.
1 for reseting the device.
•CIRCUITS: MICRO CONTROLLER CIRCUIT: SIMULATION ON PROTEUS:
RA0/AN02
RA1/AN13
RA2/AN2/VREF-/CVREF4
RA4/T0CKI/C1OUT6
RA5/AN4/SS/C2OUT7
RE0/AN5/RD8
RE1/AN6/WR9
RE2/AN7/CS10
OSC1/CLKIN13
OSC2/CLKOUT14
RC1/T1OSI/CCP216
RC2/CCP117
RC3/SCK/SCL18
RD0/PSP019
RD1/PSP120
RB7/PGD40
RB6/PGC39
RB538
RB437
RB3/PGM36
RB235
RB134
RB0/INT33
RD7/PSP730
RD6/PSP629
RD5/PSP528
RD4/PSP427
RD3/PSP322
RD2/PSP221
RC7/RX/DT26
RC6/TX/CK25
RC5/SDO24
RC4/SDI/SDA23
RA3/AN3/VREF+5
RC0/T1OSO/T1CKI15
MCLR/Vpp/THV1
U1
PIC16F877A
D1LED-BLUE
D7
14D
613
D5
12D
411
D3
10D
29
D1
8D
07
E6
RW
5R
S4
VSS
1
VD
D2
VEE
3
LCD1LM016L
1234
4321
BOARD:
MICRO CONTROLLER CIRCUIT:
PRINTED CIRCUIT BOARD
PRINTED CIRCUIT BOARD
PRINTED CIRCUIT BOARD
BCB FOR “SPDP SWITCH”
Presented by Aya Sobhy HussienEslam Taha Dina Wagih AhmedHisham abdel fatah
Light
cure
THANK YOU