Unicem pros and cons
This I believe was the first cement on the market that, in addition to being self-etching, also exhibited neutral expansion. This is an important feature for all-porcelain crowns, especially older products which tended to crack from internal stresses when a net-expansion cement was used, which was the norm for the market. Retention is excellent in almost all circumstances. I have heard some question its color stability and cite a propensity for post op sensitivity but I have not seen any unusual problems with these issues. I have used this cement more than any other since 2002. I prefer the "clicker" to the capsule, since the usual capsule doesn't yield quite enough cement to confidently fill multiple units. They also sell a large capsule, but it is so large that it is clumsy, so I do not recommend it. The only potential drawback I have seen is that it sets rather quickly. I consider this an advantage, but if the operator is not quick, it could set prior to full seating. Additionally, the removal of excess can be difficult, so I start to remove it as soon as it becomes "doughy" The company does not recommend it for posts, probably because of quick set-up time, but I use it for this purpose routinely as I consider the neutral expansion feature critical when posts are placed to reduce root fractures. As a side note, it does taste awful, so patients will wrinkle their noses when its used.
kevin dawson ,05/30/2013