The effect of different α and β gable on stainless steel and TMA segmental T-loop on the resulting force – an in vitro study

Adding more angle to the segmental T-Loop gable can affect the amount of force created to retract the canine on an orthodontic treatment with extraction. In-vitro laboratory experimental design, performed at the Chemistry Laboratory of Faculty of Science, ITB. The samples are 60 segmental T-loop springs with α and β angle of 0°–0°; 0°–45°; 45°–0°; 22.5°–22.5°; 15°–30°; 30°–15°. Force was measured using autograph with retraction distance of 1, 2, and 3 mm, then analyzed using ANOVA statistics analysis with a factorial design of 2x3x6 and 5 replications for each cell. The results of the posthoc Student Newman Keuls and Tukey test show that the added angle to the α and β gables of SS and TMA T-loop will add more resulting force along with the increase of retraction distance. The added angle to the α and β gables of SS and TMA segmental T-loop will add more resulting force along with the increase of retraction distance. The force resulted by the SS T-loop with various α and β gables are significantly different, while the force resulted by the TMA T-loop are not (p-value <0.05), as long as α + β is the same. The force resulted by the SS T-loop with various α and β gables are significantly different. However, on the TMA segmental T-loop, as long as α + β is the same, the force resulted will not be different.