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Access Cavity Preparation
By : Omid DianatDDS, MS. Assistant Professor,Shahid Beheshti Dental School
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Endodontic Treatment
Access Preparation
Working LengthCanal Preparation
Obturation
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Access Cavity
(1) Attainment of straight-line access,
(2) Conservation of tooth structure, (3) Unroofing of the chamber to expose
orifices and to remove pulp horns in
anterior teeth.
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Straigh t-L ine Access
Improved Instrument
Control.
Improved Obturation.
Decreased ProceduralErrors.
Ledge Formation.
Apical Perforation.
Furcal (Stripping) Perforation.
Tooth Structure
Removal.reduction of the dentin shelf
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Conservation of Tooth Structure
Minimal Weakening
of Tooth.
Prevention of
Accidents.
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Unroo f ing of Chamber and
Exposure
of Pulp Horns
Maximal Visibility. Location of Canals.
I mprove Straight-
Line Access. Exposure of Pulp
Horns.
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ACCESS TECHNIQUES
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CC SS S C
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ACCESS IN SPECIAL
SITUATIONS
Caries
Existing PermanentRestoration
porcelain
Existing TemporaryRestoration
Diff icult- to-Locate
CanalsDelay Isolation
Exploratory Radiographs
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Caries
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Calcified Canals
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Access cavity preparation through a ceramometal crown.
A, Diamond-impregnated, round instrument. B, After access outline is made
with the round diamond, an end-cutting or round-carbide bur cuts through the
metal. C, Access cavity prepared, allowing direct approach to the canals. D,
Test files placed without impingement on the access cavity walls.
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Maxillary Central Incisor100% 1 canal
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Maxillary Lateral Incisor100% 1 canal
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Maxillary Canine100% 1 canal
E d d ti P ti f
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Endodontic Preparation of
Maxillary Anterior Teeth
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A-perforation
B-gouging
C-gouging
D-pear shaped prep.
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E-discolorationF-ledge
G-perforationH-ledge
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5%
15%
Central
lateral
Central 25%
Lateral 30%
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70% 10%
20%
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Endodontic Preparation of
Mandibular Anterior Teeth
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gouging
Errors in ant. Mandibular Teeth
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D-Failure to explore E-discoloration F-ledge
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Maxillary first premolar
57%
16%
12%
10%
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Maxillary Second Premolar
Pulp Anatomy and Coronal Preparation53%
22%
13%
11%
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Endodontic Preparation of Maxillary
Premolar Teeth
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M ill P l T th
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Maxillary Premolar Teeth
ERRORS in Cavity Preparation
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Mandibular First Premolar
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Pulp Anatomy and Coronal Preparation
70%
4%
25%
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E d d ti P ti f M dib l P l T th
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Endodontic Preparation of Mandibular Premolar Teeth
Pulp Anatomy and Coronal Preparation
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Errors in Mandibular
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Errors in Mandibular
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M ill fi t l
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Maxillary first molar
2 canal 60%
1 foramen
80%
2Foramen
20%
M ill d M l
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Maxillary second Molar
38%
10%
Endodontic Preparation of Maxillary Molar
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Endodontic Preparation of Maxillary Molar
Teeth
Errors
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Errors
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Mandibular first Molar
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Mandibular second Molar
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92%
5%
3%
40%
35%
25%
Endodontic Preparation of Mandibular Molar Teeth
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Errors
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M dib l Thi d M l
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Mandibular Third Molar
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C Shape Canals
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p
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Rotary systems
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Rotary systems(access modification)
Maxillary molars
mesiobuccal canals
Mandibular molars
mesiolingual canals
Any Question??
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Any Question??
Thank you for attention!
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