Dental External manifestations of lines of Retzius which are present as transverse wave line groove are called as: A Incremental line of Von Ebner. B Incremental line of Owen. C Perikymata. D Enamel cuticle. 💡 Explanation External manifestations of lines of Retzius which are present as transverse wave line groove are called as: ✓ Correct Answer: C. Perikymata.