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Z-plastyThe technique/flap is used to extend, relieve and conceal a scar and ensure that the scar has a direction most appropriate for the skin’s natural lines.

The Z comes from the pattern where two equal triangular transposition flaps form a Z. Decompression of the scar occurs by the flaps shifting space. The most appropriate angle for the flap is around 60 degrees.

Link: https://plastsurgeon.com/facial-flaps/z-plasty/
Zimmer dermatomeSurgical knife instrument used to harvest superficial skin grafts. Runs either on compressed air or on electricity.

Link: https://plastsurgeon.com/surgical-instruments-2/zimmer-dermatome/