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Maximum deflection level of different orthodontic fixed lingual retainers at failure occurrence | ||
| Tikrit Journal for Dental Sciences | ||
| Volume 12, Issue 2, December 2024, Pages 399-409 PDF (716.33 K) | ||
| DOI: 10.25130/tjds.12.2.15 | ||
| Authors | ||
| Noor A. Hussain* ; Mustafa M. AL-Khatieeb | ||
| Department of Orthodontics, College of Dentistry ,University of Baghdad, Iraq. | ||
| Abstract | ||
| This in-vitro study aimed to evaluate the maximum deflection level of different orthodontic fixed lingual retainers at debonding failure occurrence. Four types of fixed-bonded lingual retainers: fiber-reinforced composite with spot and full techniques (SF,FF), braided chain wire (BCW), round metallic wire (RMW), and flat metallic wire (FMW) were used to be tested. A three-point bending test was done to measure the maximum deflection with an acrylic Frasaco mandibular model. These values were measured using a Universal Instron testing machine. Mean deference were statistically treated by ANOVA and post hoc Tukey\'s test. The FF showed the highest mean values of the maximum deflection at debonding failure than the other retainer types, followed by the RMW, BCW, and SF respectively, while the FMW showed the lowest value of the maximum deflection of the retainer type at debonding failure occurrence from acrylic teeth. There were highly significant differences (P ≤ 0.01) between FMW and RMW, BCW, and FF, and between RMW and SF, and between SF and FF types; on the other hand, there were significant differences (P ≤ 0.05) between SF and FMW and BCW, while there were non-significant differences (P > 0.05) between RMW and BCW, and FF groups. The FF retainer type was less flexible, while the SF retainer had a strong bending resistance. The BCW wire had higher impact strength, which gives the retainer more power to absorb forces and resist breakage. The RMW retainer type showed high rigidity. The FMW retainer had the least rigidity, which can be attributed to its dead-soft nature. | ||
| Keywords | ||
| retention fixed retainer maximum deflection | ||
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