Is there a way to find $\sqrt[n]{x}$ with *Mathematica* beside of x^(1/n)
as this is something different, because this is not always the same
$$(-1)^{\frac{2}{4}}=i \neq 1= \sqrt[4]{(-1)^2}$$
In the help I only found Sqrt[x] which is the squareroot and CubeRoot[x] for the cubic root.
Is there a reason that there aren't $n$-th roots implemented? (Assuming they really don't exist and I am not to stupid to find them).

I am using *Mathematica* 9.0.1 Student Edition.