A Dunnette`s test is used when comparing the variations of the control group (usually) against all of the other groups.  This test has greater power than a Boneferroni test.

The test statistic used in a Dunnette's test is the uncorrected t test statistic used in a Boneferroni, or Sidak-Boneferroni test, but it`s critical value is compared using a Dunnete`s distribution table.