a curvilinear depression normally found on each side of a triangular ridge (crista triangularis).
sup·ple·men·tal groove
(sŭp'lĕ-men'tăl grūv) An indistinct linear depression, irregular in extent and direction, which does not demarcate major divisional portions of a tooth.
sup·ple·men·tal groove
(sŭp'plĕ-men'tăl grūv) Curvilinear depression on each side of a triangular ridge (crista triangularis).