Efficiency Evaluation Of Four Differentorthodonticbonded Retainers - An In Vitro Study

Abstract

ABSTRACT
Introduction: Orthodontic retention ensures teeth remain in their treated positions posttreatment to maintain results. Bonded lingual retainers are preferred for their aesthetic
appeal and reliability in preventing relapse. The aim of the study was to analyze & compare
the efficiency of four different types of orthodontic bonded lingual retainers
Material and Methods: The study examined 60 orthodontic bonded lingual retainers
grouped by material: 0.0195" SS coaxial wire (Group A), flat braided multi-stranded SS
wire (Group B), 0.012" SS double twisted ligature wire (Group C), and fiber-reinforced
composite (Group D). These retainers were bonded to 60 pairs (120 teeth) of extracted
human premolars using Tetric N Flow adhesive. After subjecting the specimens to
thermocycling, debonding force (SBS) was measured with a UTM. Fracture mode (ARI
scores) and retainer deflection were evaluated using an optical stereomicroscope. Statistical
analyses included ANOVA,Chi-Square test, and Post Hoc Tukey test.
Results: The study outcomes indicated that all orthodontic bonded retainers in the four
study groups remained intact after undergoing thermocycling.The SBS (50.54 ± 2.86N) of
the FRC group surpassed that of the other groups and also highly significant difference of
SBS among groups(p<0.05). ARI scores 1 & 2 were in majority among the groups with
36.6% and 30.0% respectively. Group D had the highest incidence of 53.3% of adhesive
failure at the enamel-composite interface.the amount of deflection was highest in Group C
with 2.81 ± 0.24mm whereas Group D had least mean deflection of 0.08 ± 0.06mm with
highly significant results (p<0.05).
Conclusion: FRC is a persuasive option for lingual retainer bonding compared to
traditional stainless steel wires, weighing its merits and limitations. Nevertheless, the
choice between FRC and conventional methods should be a joint decision with a dental
professional, considering each patient's specific needs and treatment objectives.
Keywords: Bondedretainers,Retention,Orthodonticretaine rwires, FRC.