EVALUATION OF THE FORCE DEGRADATION OF DIFFERENT TYPES OF ORTHODONTIC INTERMAXILLARY ELASTICS AT DIFFERENT TIME INTERVALS – IN VITRO STUDY
Keywords:
latex orthodontic elastics, non-latex orthodontic elastics, intermaxillary elastics, force degradation, Dentaurum, American Orthodontics, ForestadentAbstract
Correct selection of the dimension of orthodontic elastics, knowledge of their characteristics, monitoring of released forces at different time intervals, and good cooperation with patients are required for successful orthodontic treatment. During orthodontic therapy, elastics lose their initial strength due to various physical and chemical factors that change their structure. The purpose of this study is to determine, through the analysis different types of elastics (latex and non-latex) and different brands to get information which types of elastics and which brands offer better stability during the different times of the force degradation. Material and method: To realize the set goals, a selection of three brands of elastics was chosen (Forestadent , American Orthodontics and Dentaurum) and two types of elastics from each brand (latex and non-latex). All elastics were the same diameter 4.8mm and medium force of 128g. Every group (24 groups) is consisted of 10 samples for every time interval of 0h , 12h, 24h and 48h (total of 240 elastics). The elastics were stretched to a 3D printed custom board with pins in distance of 15mm which later the elastics were taken out after the time interval to measure their force on Shimadzu Autograph AGS-X universal tester machine with pins in distance of 15mm. The degradation force was compared in the four different time intervals with repetitive measure tests (Post hoc / Bonferroni test).
Results: there was significant difference of force degradation between the latex and non latex groups, between the three type of brands and between the different time intervals of every cross examination of the groups. Latex elastics are clearly more stable overtime than non-latex elastics in every brand, Dentaurum showed higher value results in both latex and non-latex elastics. Conclusion: It is recommended to change the latex elastics every 24h and the non-latex elastics every 12h of use.
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https://www.researchgate.net/publication/332050010_Force_decay_of_intermaxillary_orthodontic_elastics_in_vitro_study, 2024 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7018489/, 2024. https://www.sciencedirect.com/science/article/abs/pii/S0889540616307715, 2024.
