Compressive characteristics of an internally threaded post system.
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.