(b) Sectional uprighting spring
1. Helical looped straight sectional arch (.016 x .016 blue elgiloy)
2. Double - triplet Quad "I" loops
2) Rotation
(a) Elastic thread¿Í power chain¸¦ lingual side¿¡ »ç¿ëÇÑ´Ù.
(b) Double horizontal "T" loops
3) Intrusion
(a) 016 x 016 blue elgiloy sectional arch wire
(b) Elastic thread
(c) Horizontal helical looped sectional arch
