This study investigated both clinicians’ use and the mechanical properties of orthodontic elastomeric chains, bridging the gap between perception and performance.

An online cross-sectional survey was conducted among 229 clinicians providing orthodontic treatment. Elastomeric chains of 2–5 loops from five products were tested for force-extension relationship using an Instron machine, and force decay was tracked over 6 weeks under three initial loadings in artificial saliva at 37 °C. Generalized estimating equations with independent working correlation were used to analyse time-by-factor interactions on force decay.

Elastomeric chains were the most commonly used space-closure accessory; 76.8% of clinicians used them based on rough estimates, and 50.0% reported being familiar or completely familiar with their mechanical properties, despite 96.4% acknowledging their importance. The force-extension curves converged when elongation was expressed as percentage of original chain length at stretches below 150%. Approximately 50% of initial force was lost within the first 24 h, followed by a minor decline over 6 weeks. Manufacturer, inter-loop space, and initial loading showed statistically significant but clinically minor effects on force decay.

Most clinicians estimated elastomeric chain forces roughly, and half demonstrated room for improved familiarity with chain mechanics. Under 150% stretch, most tested products generated comparable initial forces at the same percentage elongation. Force decay reached approximately 50% within 24 h, with marginal additional loss over 6 weeks. The replacement interval, rather than product selection, appears to be the more influential factor governing force delivery.