Optimal post length and diameter and microleakage of ...

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Post space preparation andleakage• During the mechanical preparation of the postspace it is possible that the root filling may betwisted or vibrated, with disruption of the seal• It now seems that the advantages of leaving theapical portion of the root filling undisturbed isoutweighed by the fact that much of the canalsystem is vulnerable to contamination from aninadequate seal coronally
• Provided a minimum of 5 mm of sound apicalroot filling is left in situ, studies have shown thatremoval of laterally condensed gutta percha doesnot affect the apical seal, irrespective of whetherthe post space is prepared immediately afterobturation or is delayed (Zmener 1980, Neagley1969, Bourgeois et al 1981)
Page 2 and 3: Post and core• The primary purpos
Page 4 and 5: • Lovdahl and Nicholls (1977)•
Page 6: Factors affecting the retention•
Page 9 and 10: Post length• Studies have reporte
Page 11 and 12: Post diameter• Increasing the dia
Page 14 and 15: Camp et al (1983)determined that wh
Page 16 and 17: Zmener (1980)found that in rootcana
Page 20 and 21: • The success of endodontic thera
Page 22 and 23: Importance of coronal leakage infai
Page 24 and 25: Coronal leakage…• The concept t
Page 26 and 27: Swanson & Madison,in 1987, did an i
Page 28 and 29: Torabinejad et al, in 1990,found th
Page 30 and 31: MicroleakageActual bacterial penetr
Page 32 and 33: Bacterial mechanism of tissuedamage
Page 34 and 35: Enzymes• Collagenase• Trypsin-l
Page 36 and 37: Microleakage ofendodonticallytreate
Page 38 and 39: Microleakage ….• Leakage of end
Page 41 and 42: The movement of the airbubble in th
Page 44 and 45: µl/min0,40,350,30,250,20,150,10,05
Page 46: ConclusionBased on the observations

Optimal post length and diameter and microleakage of ...

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