Compressive characteristics of an internally threaded post system.
OBJECTIVE
The effects of oblique compressive forces were evaluated for extracted teeth restored with posts of solid and internally threaded designs.


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.
Laurell
K A
KA
Ohio State University College of Dentistry, Columbus, USA.
O'Neilly
P
P
Johnston
W M
WM
D000704:Analysis of Variance; D016009:Chi-Square Distribution; D003188:Composite Resins; D019245:Compressive Strength; D003442:Crowns; D003799:Dental Stress Analysis; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D013193:Stainless Steel; D019553:Tooth, Nonvital
D003188:Composite Resins; D013193:Stainless Steel