access cavity preparation.pdf

8/11/2019 Access Cavity Preparation.pdf

1/94

Access Cavity Preparation

By : Omid DianatDDS, MS. Assistant Professor,Shahid Beheshti Dental School


2/94


3/94

Endodontic Treatment

Access Preparation

Working LengthCanal Preparation

Obturation


4/94

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.


5/94

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


6/94

Conservation of Tooth Structure

Minimal Weakening

of Tooth.

Prevention of

Accidents.


7/94

Unroo f ing of Chamber and

Exposure

of Pulp Horns

Maximal Visibility. Location of Canals.

I mprove Straight-

Line Access. Exposure of Pulp

Horns.


8/94

ACCESS TECHNIQUES


9/94

CC SS S C


10/94

ACCESS IN SPECIAL

SITUATIONS

Caries

Existing PermanentRestoration

porcelain

Existing TemporaryRestoration

Diff icult- to-Locate

CanalsDelay Isolation

Exploratory Radiographs


11/94

Caries


12/94

Calcified Canals


13/94

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.


14/94

Maxillary Central Incisor100% 1 canal


15/94

Maxillary Lateral Incisor100% 1 canal


16/94

Maxillary Canine100% 1 canal

E d d ti P ti f


17/94

Endodontic Preparation of

Maxillary Anterior Teeth


18/94


19/94


20/94

A-perforation

B-gouging

C-gouging

D-pear shaped prep.


21/94

E-discolorationF-ledge

G-perforationH-ledge


22/94


23/94


24/94


25/94


26/94


27/94

5%

15%

Central

lateral

Central 25%

Lateral 30%


28/94

70% 10%

20%


29/94

Endodontic Preparation of

Mandibular Anterior Teeth


30/94


31/94

gouging

Errors in ant. Mandibular Teeth


32/94

D-Failure to explore E-discoloration F-ledge


33/94


34/94


35/94


36/94


37/94


38/94

Maxillary first premolar

57%

16%

12%

10%


39/94

Maxillary Second Premolar

Pulp Anatomy and Coronal Preparation53%

22%

13%

11%


40/94

Endodontic Preparation of Maxillary

Premolar Teeth


41/94

M ill P l T th


42/94

Maxillary Premolar Teeth

ERRORS in Cavity Preparation


43/94


44/94


45/94


46/94


47/94


48/94


49/94

Mandibular First Premolar


50/94

Pulp Anatomy and Coronal Preparation

70%

4%

25%


51/94

E d d ti P ti f M dib l P l T th


52/94

Endodontic Preparation of Mandibular Premolar Teeth

Pulp Anatomy and Coronal Preparation


53/94

Errors in Mandibular


54/94

Errors in Mandibular


55/94

M ill fi t l


56/94

Maxillary first molar

2 canal 60%

1 foramen

80%

2Foramen

20%

M ill d M l


57/94

Maxillary second Molar

38%

10%

Endodontic Preparation of Maxillary Molar


58/94

Endodontic Preparation of Maxillary Molar

Teeth

Errors


59/94

Errors


60/94


61/94


62/94


63/94


64/94


65/94


66/94


67/94


68/94


69/94


70/94


71/94

Mandibular first Molar


72/94


73/94

Mandibular second Molar


74/94


75/94

92%

5%

3%

40%

35%

25%

Endodontic Preparation of Mandibular Molar Teeth


76/94

Errors


77/94


78/94


79/94


80/94


81/94


82/94


83/94


84/94


85/94

M dib l Thi d M l


86/94

Mandibular Third Molar


87/94

C Shape Canals


88/94

p


89/94


90/94


91/94

Rotary systems


92/94

Rotary systems(access modification)

Maxillary molars

mesiobuccal canals

Mandibular molars

mesiolingual canals

Any Question??


93/94

Any Question??

Thank you for attention!


94/94

access cavity preparation.pdf

Documents