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Thanks to Pfaffian techniques, we study the R\'enyi entanglement entropiesand the entanglement spectrum of large subsystems for two-dimensionalRokhsar-Kivelson wave functions constructed from a dimer model on thetriangular lattice. By including a fugacity $t$ on some suitable bonds, oneinterpolates between the triangular lattice (t=1) and the square lattice (t=0).The wave function is known to be a massive $\mathbb Z_2$ topological liquid for$t>0$ whereas it is a gapless critical state at t=0. We mainly consider twogeometries for the subsystem: that of a semi-infinite cylinder, and thedisk-like setup proposed by Kitaev and Preskill [Phys. Rev. Lett. 96, 110404(2006)]. In the cylinder case, the entropies contain an extensive term --proportional to the length of the boundary -- and a universal sub-leadingconstant $s_n(t)$. Fitting these cylinder data (up to a perimeter of L=32sites) provides $s_n$ with a very high numerical accuracy ($10^{-9}$ at t=1 and$10^{-6}$ at $t=0.5$). In the topological $\mathbb{Z}_2$ liquid phase we find$s_n(t>0)=-\ln 2$, independent of the fugacity $t$ and the R\'enyi parameter$n$. At t=0 we recover a previously known result, $s_n(t=0)=-(1/2)\ln(n)/(n-1)$for $n<1$ and $s_n(t=0)=-\ln(2)/(n-1)$ for $n>1$. In the disk-like geometry --designed to get rid of the boundary contributions -- we find an entropy $s^{\rmKP}_n(t>0)=-\ln 2$ in the whole massive phase whatever $n>0$, in agreement withthe result of Flammia {\it et al.} [Phys. Rev. Lett. 103, 261601 (2009)]. Someresults for the gapless limit $R^{\rm KP}_n(t\to 0)$ are discussed.

R\'enyi entanglement entropies in quantum dimer models : from criticality to topological order