This article summarized research progress in recent years of different post-and-core systems about their styles and characters,the retention and resistance force of post-and-core crowns and the cementation technique in the hope of providing some enlightenment for the clinical treatments.

Evaluation of factors affecting retention of two fiber posts using push-out test;

The Factor of Influencing the Complete Dentrue s Retention and Stability;

The effect of desensitizing agent on the retention of cast crown;

Modified TDI-TMP addition pre-polymer is synthesized and is studied about its use in PU coatings for wood furniture; experiments show that it is of good storage stability, low viscosity and high solid in paint, good brushability, film fullness, impact resistance and weatherability in addition with performance-price ratio and can replace ordinary adducts.