lecture will include 1 – difference between permanent & deciduous teeth 2- pulp ( contents...
TRANSCRIPT
Lecture will include
1 – Difference between Permanent & Deciduous teeth
2 -Pulp ( Contents & Compartments)3 -Pulp space Morphology:
a. Root canal system b. Pulp space morphology of anterior
teeth c. Pulp Space morphology of premolars
4 -How to make Access Preparation
Difference between Permanent & Deciduous Teeth
Deciduous PermanentLarger in size Small in size
Crown is less Bulbous Crown is Bulbous
Crown is darker in color Crown is light in color
Less prominent cervical ridge Prominent cervical ridge( especially 1st deciduous molar)
Longer trunk (the furcation is away from
cervical line)
Short trunk (the furcation is directly after
cervical line)
Less widely divergent roots. Widely divergent roots( to enclose the developing
successor)
Anatomy of the pulp
*The coronal pulp
*The radicular pulp
*Apical foramen
*The average size of the apical
foramen is varies from 0.3 to 0.6mm.
The dental pulp is highly specialized loose delicate connective tissue occupying the central portion of the tooth
Types of Root Canal SystemA) Classification of Root canal Acc. To Form & Configuration
(By Weine)
Ramification Type I Type II Type III Type IV Type V Type VI
Orifice one two two single single two
Root Canal single two Two Single
Branching in middle 1/3
surrounding
a dentin island
2 Canals unite at cervical 1/3 then divide at
apical 1/3
Apical Foramen
single single Two Two single two
B) According to Maturation & Curvature (Root Canal Classes)
Class I Class II Class III
Mature (having apical constriction) Immature (open apex)
straightSlightly curved
Severely curved
Dilacerated Bayonet tubular blunderbuss
Mandibular
Canine
Maxillary Canine
Mandibular
Lateral
Mandibular
Central
Maxillary
Lateral
Maxillary
Central
1 3 Pulp Horns
Oval Triangle PulpChamber
FrontalView
(Mesio-Distal)
NarrowHas uniform taper
WideHas uniform
taper
Root Canal
-Wide follow external outline ,pointed incisally & widen
cervically-
PulpChambe
r
Proximal
View(Bucco-
Lingual)
-Wide-Constricted in
apical 3rd
-Wide(if 2 canals)-Uniform taper
-Wide-Uniform taper
Root Canal
Single RootedType I ,II,III
1 canal or 2 canals(30-40%)
No. of Roots &Root Canal
system
-Oval in shape
-Triangular in shape with base incisally & apex civically-
Outline Form
24 25- 26Longest
root
21 22.5 23 Average Root Length (in milimeters)
Wide Narrow
Type Iل Type Iل
Type I 94%
Type II,III 6%
Mandibular 2nd
Premolar
Mandibular 1st Premolar
Maxillary 2nd
Premolar
Maxillary1sr
Premolar
2 Buccal (most prominent) & Lingual Pulp Horns
-Oval-Narrow
PulpChamber
Facial View
(Mesio-Distal)
Narrow RootCanal
-Wide-Pointed incisally & widen cervically
Pulp Chamber
Proximal View
(Bucco- Lingual)-Wide
-Sudden constriction in middle 3rd
-Wide(1 root)
-Narrow(2 roots)
RootCanal
-1 root 85 % 1 canal 15% 2 canals
(type IV mainly , type
II ,III)
-rare 2 roots
-1 root 85 % Type I 70% Type II 20%
Type III 10%)- 2 roots 15%
-20% bayonet
curve
-2 r00ts 60%
-1 root 38%
Type I 10%
Type II 20%
Type III 70%
-3 roots 2%
(3 root canals (2 B
& 1 Ling.
No. of Roots&
Root canal System
Oval (buccolingually) Ovoid (buccolingually)
From buccal cusp tip to base of Palatal cusp
Outline form
21.5 mm 21 mm 21 mm Average Root Length
MandibularPremolars
MaxillaryPremolars
Anterior Teeth
Occlusal Lingual/ Palatal2 -
EntranceParallel to long axis 90° degree till
dentinThen 45° till
pulp(with long axis)
3 -Direction
At 1/3 of lingual incline of buccal
cusp
CentralGroove
Middle Of
Middle
4 -Point Of
Peneteration
Ovoid Oval Triangle (Base incisallya &
Apex cervically)
5 -OutlineForm
Should not touch i/marginal ridges ii/ incisal edge
iii/ cingulum
6 -Size (Extent)