Analysis on dimensional variation of dental arches by using low friction bindings

This study analyses the expansive capacities of the new low friction binding system,compared with the conventional elastomeric binding system. Methods. 12 young people aged between 11 and 14 have been counted among the patients, who have skeletal malocclusion of Class II or III and with slight to moderate crowding of teeth,with no need of tooth extraction.The participants have been divided into two groups of 6: the first group has been treated with conventional elastomeric bindings,the second with low friction bindings,always using 0.14 NiTi arches and conventional stainless steel brackets.All the patients have been submitted to periodical check-ups Results. After 90 days the changes of the following parameters have been evaluated: intercanine distance, interpremolar and intermolar distance, dental arch length and perimeter. It has been found that the patients with low friction bindings show a greater increase of the interpremolar distance,while the patients with elastomeric bindings show a greater increase of the intermolar distance and of the dental arch length and perimeter;the latters have also showed a slightly greater increase of the intercanine distance. Discussion. As low friction dental braces do not alter the biological bone-periodontium-teeth system,they would allow a physiological movement of the teeth with the bone and a remodelling of the arch dimension.