Analysis of sliding mechanics force degradation during postextraction space closure

Introduction. Due to its simplicity, sliding mechanism is very often used in clinical practice for post-extraction space closure, however, the efficiency of this method may be reduced due friction and changes properties materials method. The most commonly methods mechanics are nickel titanium (NiTi) closed coil spring elastic chain. aim study was analyze force degradation application springs chains during closure within treatment with fixed orthodontic appliances. Material Methods. total sample consisted 78 spaces patients who were indicated extraction first premolars Nickel close spaces. Post-extraction monitored 6 months follow up examinations every 4 weeks. Measurements initial force, at beginning activation residual observation period performed control examinations. Results. Results research showed that both there a significant decrease period. When using NiTi springs, value average examination between 189.00-210.25 g, while range 117.56-133.50 g kept an 61.57% force. on 184.5-205.38 100.39-113.00 retained 53.41% Conclusion. There inspections, when applied. loss phases smaller compared forces produced by chains.