Force degradation in orthodontic elastic chains

  • Dayanne Lopes da Silva Pontifíca Universidade Católica do Rio Grande do Sul
  • Cláudia Kochenborger Pontifíca Universidade Católica do Rio Grande do Sul
  • Ernani Menezes Marchioro Pontifíca Universidade Católica do Rio Grande do Sul
Keywords: elásticos, elastômeros, cadeias elastoméricas.

Abstract

Purpose: This in vitro study aimed to analyze the force degradation of four commercial brands of orthodontic elastics chain (Morelli, Ormco, TP, and Unitek) over 21 days. Methods: The elastics chains were stretched and maintained at a standardized distance equivalent to a force of 150 g. The amount of force generated by the elastics chains were measured by using a dynamometer (ZEUZAN 300 g) at intervals of 30 minutes, 7, 14, and 21 days. Data were analyzed by ANOVA and Tukey’s test at the 5% level of significance. Results: There was a reduction of 5% to 15% in the amount of force generated by the elastic chains after 30 minutes and of 22% to 47% after 21 days of elastic activation. Conclusion: Unitek chains displayed the highest percentage of force degradation, while TP exhibited the smallest percentage of force degradation and showed the greatest stability at all intervals tested.

Author Biographies

Dayanne Lopes da Silva, Pontifíca Universidade Católica do Rio Grande do Sul
Extensionista em Ortodontia II (PUCRS) e em Ortodontia e Ortopedia Facial (ABO-RS).
Cláudia Kochenborger, Pontifíca Universidade Católica do Rio Grande do Sul
Extensionista em Ortodontia II (PUCRS)
Ernani Menezes Marchioro, Pontifíca Universidade Católica do Rio Grande do Sul
Mestre em Ortodontia (UFRJ). Doutor em Ortodontia (UNESP Araraquara)
Published
2009-08-10
Section
Original Article