Objective: To compare the remaining force between 4- and 7-module memory elastomeric chains (ECs)
Dyna-Link (D), Power Chain generation II (P), and Super Chain (S) (D4, P4, and S4 and D7, P7, and S7 groups) and
to compare the remaining force between the 4- and 7-module ECs in each brand (D4-D7, P4-P7 and S4-S7 groups)
during simulated canine retraction. Materials and methods: ECs were divided into six groups (D4, P4, S4, D7, P7, and
S7 groups) (n=10). The samples were stretched using a Universal Testing Machine to obtain an approximately 150
grams force and the stretch distance was maintained using pinned blocks which kept in artificial saliva at 37ºC. The
remaining force in each sample was measured after three and 24 hours, three days, and one, two, three and four
weeks. Statistical analysis was performed using the SPSS program. Results: Comparing the 4-module groups, the
D4 group demonstrated the significantly lowest remaining force at three days. The S4 group had the significantly
highest remaining force at one week. The significantly lowest remaining force was seen in the P4 group from 2–4
weeks. When 7-module groups were compared. The S7 group demonstrated the highest remaining force, while the
D7 group presented the lowest remaining force from 3 hours - 4 weeks. Comparing the 4- and 7-module groups,
the S7 and P7 groups had a significantly higher remaining force compared with the S4 and P4 groups, respectively.
Conclusion: When an initial force of 150 grams was applied, the S7 group demonstrated the highest remaining force
over four weeks. When using ECs for retracting teeth, 7-module chains are preferable compared with 4-module chains.