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Compressive characteristics of an internally threaded post system
K A Laurell1, P O'Neilly, W M Johnston
1Ohio State University College of Dentistry, Columbus, USA.
Purpose:
The effects of oblique compressive forces were evaluated for extracted teeth restored with posts of solid and internally threaded designs.
Materials And Methods:
A group of 25 roots was restored with crowns supported by Para-post dowels and pin-retained composite resin cores, and a second group was restored with gold copings cast to internally threaded stainless steel-post prototypes. Samples were then embedded in epoxy resin and loaded at 45 degrees until failure. Failure force and type were statistically analyzed to determine statistical difference (P < .05) between groups.
Results:
No statistical difference was shown between groups for either fracture force or type.
Conclusions:
The internally threaded post system resisted oblique loading forces similarly to a solid post system.