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Presented by :
1. Sarah salah khalil
2. Ramajmohamedelfeki
3. Rana mohieldeinmotawe'
4. zahraa Abd_Allah Ali
5. sara mosaad Mahmoud
6. salma hatemmohammed
7. samar Samir eissa
Access cavity
Cleaning and shaping
Obturation
The root canal system must be :
Cleaning of its organic remnants.
Shaping to receive a three dimensional
filling of root canal space.
The canal is
Cleansed primarily by irrigation
Shaped primarily by instrumentation
Create a continuous taper with the
narrowest part apically and the widest
part coronal.
By instruments.
According to material of construction
According to power source
According to method of manufacturing
ISO classification
Carbon
steel
Stainless
steel
Ni-Ti Diamond
Advantage •Hardness
than St-St
•Corrosion
resistance
•Shape
memory
•Super
elastic
•Corrosion
resistance
Disadvantage •Corrosion
•Can’t
resterilized
•Brittle
•Prone to
fracture
•Stiff in
nature
•Permanent
distortion
•Less cutting
efficiency
•No sign of
fatigue
before
fracture
Example Barbed
broach
H-file , K-file,
reamer
Ni-Ti hand
file ,profile,
protaper
Sonic &
ultrasonic
HAND Driven :
Engine Driven :rotary & vibratory
Counter clock wise twisting
Machine grinding
GROUP I- Hand use only , files
GROUP II- low speed instrument latch
type drill , Gates-Glidden
GROUP III- Engine driven latch type
same as group I
1. Standardization of length of cutting blade :
The length of cutting blade =
The full length of instrument (L) =
2. Standardization of Diameter :
Diameter at D16 is
Uniformly greater
Than D0 = D0D16
3. Standardization of numbering system:
The number indicates the diameter at
the tip in hundredth of mm
File size #15, D0 =15/100 =0.15mm
4. Standardization of taper : Taper : the amount the file diameter increases
each mm along its cutting blade.
Taper = Diameter/Length
=0.32/16=0.02mm diameter /mm length
D12 =0.15+(.02*12)=0.39mm
5. Standardization of tip angle:
the tip angle 75+/- 15
6. Standardization of color coding
Color Size Tip (mm)at D0 at D16
Pink
Grey
Purple
06
08
10
0.06
0.08
0.10
0.38
0.40
0.42
White
Yellow
Red
Blue
Green
Black
15
20
25
30
35
40
0.15
0.20
0,25
0.30
0.35
0.40
0.47
0.52
0.57
0.62
0.67
0.72
White
Yellow
Red
Blue
Green
Black
45
50
55
60
70
80
0.45
0.50
0.55
0.60
0.70
0.80
0,77
0.82
0.87
0,92
1.02
1,12
White
Yellow
Red
Blue
Green
Black
90
100
110
120
130
140
0.90
1.00
1.10
1.20
1,30
1.40
1.22
1.32
1.42
1.52
1.62
1,72
#6-#10 =.02mm
#10-#60=.05mm
#60-#140=.1mm
A. Basic instrument :
Broach and rasps (rat –tail file / R-file)
Reamer
Files
B. Hybrid instrument
Expiration pulp tissue.
Remove cotton or point paper lodge in canal.
Broach Rasps
Barb are fine and longer Barb are blunt and
shorter
Method of fabrication : counter clock wise twisting
Material of manufacture : stainless steel
Cross-section :
Motions : Ream (insertion , full turn and
withdraw)
Uses preparation round canal
Method of fabrication : counter clock wise twisting
Material of manufacture : stainless steel
Cross-section :
Motions :
1. Ream (insertion , full turn and
withdraw)
2. Filing (push and pull
3. Quarter turn and pull
Method of fabrication : machine grinding
Material of manufacture : stainless steel
Cross-section : coma shape
Motions :
1. Filing (push and pull
I. Modification in instrument design:
1. Modification in the cross-section.
2. Modification in depth and angle of cutting blade.
3. Modification in taper.
4. Modification in tip design.
5. Modification in length of the cutting blade.
II. Modification in material of manufacturing.
III.Modification in method of manufacturing.
IV.Modification in numbering system
1. Modification in the cross-section.
K-file modification
Flex-0-file & Flex –R-file
Flexibility and cutting
Efficiency.
Apply light force
K-flex-file
Flexibility and cutting
Efficiency
Debris removal
H-file modification
Unifile & S-file Heli-file
2.Modification in taper.
• All Ni-Ti has taper greater than ISO taper
(0.02) range from (0.04 to 0.12).
• To increase coronal flaring.
• ProTaper.
3.Modification in tip design.
Non-cutting tip ,less transportation
5. Modification in length of the cutting
blade
Reduction cutting blade from 16mm to
2.5-4mm.
Canal master It has U-shaped design, which keeps the instrument
centralized within the canal and reduce tendency of the
instrument to screw-in.
A noncutting smooth shaft.
A noncutting pilot tip, that allows the instrument remains within the lumen of the canal, thus avoid transportation.
Nickel-titanium
2-3 times flexible than stainless steel instruments
super elasticity
k-file modifications: Ultra file
H-file modification : Hyflex
K-file modifications :
Machine grinded
1- flex-o-file and flex-R-file
2-Ni-Ti fffiles
H-file modifications :
Safety headstrom file
The D0 diameter progressively increased by
0.02 mm for ISO sizes 6-10.
0.05 mm for sizes 10-60.
0.10 mm for sizes 60-140.
This means that, the D0 diameter not has a constant percentage change from one instrument size to another.
To reduce the large percentage change between the smaller-sized files:
Golden Mediums (12-37) #10 =0.1mm #12=0.12mm #15=0.15mm
The ProFile Series 29 These instruments are based on a constant percentage
change 29.17% at D0
Gates-Glidden drills
They have long thin shaft with a flame-shaped cutting head (one spiral).
They are side cutting instruments with safety tips.
They are available in 6 sizes from .1-6 (# 50-150). Number of rings on the shank identifies the specific drill size.
They are made of either St St or Ni-Ti (Flexogates).
They are designed to break high on the shaft if excessive resistances encountered, allows the clinician to remove the fragment easily.
Uses:
1. Preenlarging the coronal. 2/3.of the root canal;
2. Opening of the canal orifice.
3. Removal of Gutta-percha.
•They have long thin
shaft with a flame-
shaped cutting head
(two spiral).
•They are side cutting
instruments with safety
tips.
•They are available in 6
sizes from .1-6 (# 70-170).
Number of rings on the
shank identifies the
specific drill size.
NaOCl
EDTA and CITRIC ACID (CA)
CHLORHEXIDINE DIGLUCONATE (CHX)
MTAD (Mixture of Tetracycline isomer,
Acid, and Detergent)
Manual :1) Syringe irrigation with needles/ cannulas (end/side vent)2) Brushes MACHINE ASSISTED1) Rotary brushes
2) Continuous irrigation during rotary instrumentatin (Quantec-E) 3) Sonic4) Ultrasonic5) Pressure alternating devices : EndoVac Rinse Endo6) Recent advance system Lasers Light activated disinfection (LAD) Electrochemically activated water (ECA) Oxidative potential water (OPW)
I. Syringe irrigation with needles/ cannula: Different sizes (1-20 ml) Modifications of tip of the needles
A. BivelledB. Monoject
C. Safe ended Modifications of needles
A) Bending the tip B) Flexiglide needle AdvantagesA) 27-31 gauge recommended B) Should not bind in the canalC) Easily controlled DisadvantagesA) Not enough flushing action B) Deliver solution only 1 mm
deeper than the tip of the needle