Dental Light Cure

1. DENTAL CURING LIGHT
DEVELOPMENT & PRODUCTION
Introduced to ::::::

2. 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.

3. 2_TIME TABLE
TASKS START FROM END
Analyzing the product in the 20/9/2012 29/9/201
market . 2
Reverse engineering. 1/10/2012 20/10/20
12
Ideas for developments 20/10/2012 25/12/20
and the final addition and 12
shape for project.

4. 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

5. 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.


6. 1.Old Light Cure
 Operates with halogen
lump.
 Disadvantage: consume
high power.

7. 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.[

8. 2.Using Blue Led
 is most widely used .
2.1wireless:
 Disadvantages: the
chargeable battery is weak.
2.2hand with adaptor
 Wireless Light Cure
 better than the wireless

9. 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.

10. 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.

11. 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

12. 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 .

13. Prices of the device in the market:-•
Type of the device prices
Chinese device 500-1000L.E.
Korean device 1300 L.E
German device reach 4000 L.E.
China wholesale device 300 L.E.
The latest device with lens to measure the wavelength 800 L.E.

14. Famous damages in:-

1) Led.
2) Board.
3) Battery in wireless .

15. 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 - safer
2 - Replace the 3 resistors, 3 LED with 2 one LED (tri-
color)

16. 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)

17. Advantages
 Light in weight
 Easy to handle
 Convenient to control
 Device Can Be Operated Either by battery or AC 220volt.

18. 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

19. 1. BLOCK DIAGRAM
•Power 5v •Micro •Blue Led
Controller
Circuit
Power ct.
It will be Battery or Adaptor.

20. 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.


21. 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

22. 2.PIC 16F628A
Program Memory 2048x14
Cost: RAM (Bytes) 224
30 L.E. 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

23. Tri-Color LED (Red/Green)
Used as
indication led
for 3 modes of
device.
cost :
100 piaster

24. 10KΩ
RESISTORS
• (1/4 W)
• Cost:
25 Piaster

25. 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.

26. 330 Ω
RESISTORS
(1/4W).
Cost:
0.05 L.E

27. ADAPTOR :
 DC5V 1A
Switching Power
Supply adapter
100-240 AC.
 Cost:
$2.60

28. LCD DISPLAY:
 We used Lcd “ 2*16 ”
For displaying which mode is
chosen .
Cost :
30 L.E.

29. 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

30. CAPACITORS :
2capacitors of 22
micro-Farads (µF) .
 Cost :
1 L.E.

31. 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.

32. CIRCUITS:
MICRO CONTROLLER CIRCUIT:
SIMULATION ON PROTEUS:
LCD1
LM016L
VDD
VSS
VEE
RW
RS
D0
D1
D2
D3
D4
D5
D6
D7
E
U1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
13 33
OSC1/CLKIN RB0/INT 1
14 34
OSC2/CLKOUT RB1 2
35
RB2 3
2 36
RA0/AN0 RB3/PGM 4
3 37
RA1/AN1 RB4
4 38
1
2
3
4
RA2/AN2/VREF-/CVREF RB5
5 39
RA3/AN3/VREF+ RB6/PGC
6 40
RA4/T0CKI/C1OUT RB7/PGD
7
RA5/AN4/SS/C2OUT
15
RC0/T1OSO/T1CKI
8 16
RE0/AN5/RD RC1/T1OSI/CCP2
9 17
RE1/AN6/WR RC2/CCP1
10 18
RE2/AN7/CS RC3/SCK/SCL
RC4/SDI/SDA
23 D1
1 24 LED-BLUE
MCLR/Vpp/THV RC5/SDO
25
RC6/TX/CK
26
RC7/RX/DT
19
RD0/PSP0
20
RD1/PSP1
21
RD2/PSP2
22
RD3/PSP3
27
RD4/PSP4
28
RD5/PSP5
29
RD6/PSP6
30
RD7/PSP7
PIC16F877A

33. BOARD :

34. MICRO CONTROLLER CIRCUIT:

35. PRINTED CIRCUIT BOARD

36. PRINTED CIRCUIT BOARD

37. PRINTED CIRCUIT BOARD

38. BCB FOR “SPDP SWITCH”

39.  Aya Sobhy Hussien
Eslam Taha
Dina Wagih Ahmed
Hisham abdel fatah