Tooth Morphology and Access Cavity Preparation PDF

TOOTH MORPHOLOGY AND ACCESS CAVITY PREPARATION 1  ACCESS CAVITY PREPARATION Access is the first and most important phase of root canal treatment. A well designed access preparation is essential for a good endodontic results. 2 ...

TOOTH MORPHOLOGY AND ACCESS CAVITY PREPARATION 1  ACCESS CAVITY PREPARATION Access is the first and most important phase of root canal treatment. A well designed access preparation is essential for a good endodontic results. 2  Cont… Access cavity – is defined as endodontic coronal preparation which enables unobstructed access to the canal orifices,a straight line access to apical foramen,complete control over instrumentation and to accommodate obturation technique. 3  cont… Success of endodontic therapy a) cleaning and shaping b) Disinfection c) Three-dimentional obturation of the root canal system. 4  Cont… Note.The main objective of the access cavity preparation is to create, a smooth, straight line access to the canal system and the apex. An ideal access preparation should have following quality. 1. An unobstructed view in to the canal 2. A file should pass in to canal without touching any part of the access cavity. 3. No remaining caries should be present in access cavity 5  Cont… 4. Obturating instruments should pass in to the canal with out touching any portion of the access cavity. 6 7 8 9 10 11 12 13 2. Convenience form: It is the form given to the access cavity to improve visibility, instrumentation and obturation of the root canal by providing a straight line access from occlusal surface to the apical foramen. Benefits: 1. Unobstructed access to the orifices. 2. Direct access to the apical foramina. 3. Complete authority over the instrument. 4. Expansion to accommodate filling techniques. 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Trapezoid Trapezoid 45 46 47 48 49 50 51 52 53 54 55 56 57 7-Second law of orifice location: The orifices of the root canals are always located at the angles in the floor– wall junction 58 59 Thank you for your attention!! 60