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The presence of a Dirac nodal line in a time-reversal and inversion symmetricsystem is dictated by the $\mathbb{Z}_2$ index when spin-orbit interaction isabsent. In a first principles calculation, we show that a Dirac nodal line canemerge in $\mathbb{Z}_2$ trivial material by calculating the band structure ofSnSe in a face centered cubic lattice as an example. We qualitatively show thatit becomes a topological crystalline insulator when spin-orbit interaction istaken into account. We clarify the origin of the Dirac nodal line by obtainingirreducible representations corresponding to bands and explain the trivialityof the $\mathbb{Z}_2$ index. We construct an effective model representing theDirac nodal line using the {\bf k}$\cdot${\bf p} method, and discuss the Berryphase and a surface state expected from the Dirac nodal line.

Face centered cubic SnSe as a $\mathbb{Z}_2$ trivial Dirac nodal line material