Effect of design of pre-fabricated posts and post heads on the retention of various cements and core materials

summary The retention of new Para Post (PP) rounded undercut post head (PP‐XT) was compared with the conventional flattened head (PP‐P), using amalgam Dentacore and Synergy composite as core materials. The retention of the posts PP (passive serrated), PP‐P (passive serrated with venting channels),...

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Bibliographic Details
Published in:	Journal of oral rehabilitation Vol. 30; no. 7; pp. 702 - 707
Main Authors:	Hochman, N., Feinzaig, I., Zalkind, M.
Format:	Journal Article
Language:	English
Published:	Oxford, UK Blackwell Science Ltd 01-07-2003
Subjects:	Bisphenol A-Glycidyl Methacrylate Dental Cements Dental Pins Dental Prosthesis Design Dentistry Humans Materials Testing Post and Core Technique - standards post-core systems retention Tensile Strength Zinc Phosphate Cement
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Summary:	summary The retention of new Para Post (PP) rounded undercut post head (PP‐XT) was compared with the conventional flattened head (PP‐P), using amalgam Dentacore and Synergy composite as core materials. The retention of the posts PP (passive serrated), PP‐P (passive serrated with venting channels), PP‐XP (passive, raised diamond‐style pattern) and PP‐XT (threaded on the coronal portion, and passive, raised diamond‐shaped pattern on the apical portion), cemented with zinc phosphate cement (ZPC) or Duo Cement to extracted teeth, was evaluated. Tensile strength plots were recorded using an Instron instrument, while pulling the post and core in opposite directions. The following conclusions were drawn from this study: (i) The round undercut PP‐XT head was more retentive than the PP‐P head with both core materials. (ii) Amalgam was more retentive than Synergy with both head designs. (iii) PP‐XT was the most retentive post to extracted tooth canals and PP‐XP was the least retentive with either ZPC or Duo Cement. Post retention with (iv) ZPC in decreasing order of magnitude: PP‐XT > PP‐P > PP > PP‐XP; and with Duo Cement: PP‐XT > PP > PP‐P > PP‐XP ‐ ZPC exhibited the highest retention of cemented posts.
Bibliography:	ArticleID:JOOR1120 istex:7EBD93E1310C38C17137D0A8B0BE4E5DAD4C0D2C ark:/67375/WNG-KMFH66BR-D ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0305-182X 1365-2842
DOI:	10.1046/j.1365-2842.2003.01120.x