  Given a bounded operator $Q$ on a Hilbert space $\mathcal{H}$, a pair of
bounded operators $(T_1, T_2)$ on $\mathcal{H}$ is said to be $Q$-commuting if
one of the following holds:
  \[
  T_1T_2=QT_2T_1 \text{ or }T_1T_2=T_2QT_1 \text{ or }T_1T_2=T_2T_1Q. \] We
give an explicit construction of isometric dilations for pairs of $Q$-commuting
contractions for unitary $Q$, which generalizes the isometric dilation of Ando
[2] for pairs of commuting contractions. In particular, for
$Q=qI_{\mathcal{H}}$, where $q$ is a complex number of modulus $1$, this gives,
as a corollary, an explicit construction of isometric dilations for pairs of
$q$-commuting contractions which are well studied. There is an extended notion
of $q$-commutativity for general tuples of operators and it is known that
isometric dilation does not hold, in general, for an $n$-tuple of $q$-commuting
contractions, where $n\geq 3$. Generalizing the class of commuting contractions
considered by Brehmer [8], we construct a class of $n$-tuples of $q$-commuting
contractions and find isometric dilations explicitly for the class.
