Abstract
Background. Elastomeric chains and NiTi coil springs are two major traction aids in orthodontic tooth movements. Force degradation occurs over time in both groups, with higher percentages in elastic chains. The effects of environmental factors and some mouth rinses on this force decay have been previously studied. No study has been performed to evaluate the effect of current popular mouth rinses such as Orthokin, Sensikin and Persica on this force degradation.Methods. Forty pieces of elastic chains consisting of 5 loops (Ortho Technology, USA) and 40 NiTi closed coil springs (3M Unitek, Germany) were divided into 4 groups: control (artificial saliva), Orthokin mouthwash, Sensikin mouthwash and Persica mouthwash. All the groups were kept in an incubator at 37°C for 3 weeks. In the test groups, the samples were immersed in mouthwash twice a day. Force degradation was measured at 5 time intervals: baseline, 1 hour, 24 hours, 1 week and 3 weeks, using a digital force gauge. Repeated-measures ANOVA and one-way ANOVA were used for statistical analysis.Results. Force decay occurred over time in both elastic chainand coil spring groups. In elastic chain group, after 3 weeks, Orthokin mouth rinse had significantly lower force degradation compared to other groups (P < 0.05) and in coil spring group there were no statistically significant differences in force degradation after 3 weeks between the subgroups (P > 0.05).Conclusion. Based the results of this study, these three mouthwashes did not increase the force degradation of orthodontic traction aids under study.
Highlights
Elastomeric chains are used in orthodontic tooth movements for different purposes, including midline correction, space closure and moving the impacted teeth.[1]
There is no information available on the effect of Orthokin, Sensikin and Persica mouth rinses on the force degradation of elastomeric chains and NiTi coil springs; the aim of this study was to evaluate the effects of these three mouthwashes on the force decay of elastomeric chains and NiTi coil springs
Forty continuous clear elastomeric chain specimens (Ortho Technology, USA) each consisting of 5 loops[5] and forty NiTi coil springs (3M Unitek, Germany) measuring 12 mm in length[11,12,22] were randomly divided into 4 groups: Group 1: Artificial saliva Group 2: Persica mouth rinse Group 3: Orthokin mouth rinse Group 4: Sensikin mouth rinse Eight plastic blocks (Figure 1) with 10 pairs of stainless steel pins, to maintain each sample at its specific length, were prepared to carry samples without relaxation.[11]
Summary
Elastomeric chains are used in orthodontic tooth movements for different purposes, including midline correction, space closure and moving the impacted teeth.[1]. Nickel-titanium (NiTi) coil springs are another orthodontic traction aids and according to previous studies[11,12,13] they are preferred for space closure compared to elastomeric chains since their forces are light and continuous; they close spaces more consistently than elastomeric chains. Forty pieces of elastic chains consisting of 5 loops (Ortho Technology, USA) and 40 NiTi closed coil springs (3M Unitek, Germany) were divided into 4 groups: control (artificial saliva), Orthokin mouthwash, Sensikin mouthwash and Persica mouthwash. Force decay occurred over time in both elastic chain and coil spring groups. After 3 weeks, Orthokin mouth rinse had significantly lower force degradation compared to other groups (P < 0.05) and in coil spring group there were no statistically significant differences in force degradation after 3 weeks between the subgroups (P > 0.05).
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