Cambios dimensionales del arco inferior en pacientes tratados con sistemas Damon y MBT

Abstract

Currently there are disputes over dimensional changes in patients treated with both conventional orthodontic techniques and passive self-ligating. This research aimed to evaluate these dimensional changes of the lower arch into two treatment systems: Damon and MBT to determine which of them produce or does not excessive transverse expansion, arch length and incisive protrusion, as unplanned changes at the end of treatment. They were selected pretreatment and post treatment models such as 20 for Damon system and 19 for the MBT system with an equal number of initial and end digital cephalic radiographs of patients discharged by residents of the postgraduate orthodontic clinic of the University of Cuenca. It was determined the programmed values related the transverse diameter, transverse expansion, incisive protrusion and increase the length of the arch with the technique of Wala Ridge at the level inter-canine, inter-first premolar, inter-seconds premolar and inter-molars and compared with real results. The data were statistically processed by SPSS software version 22 with Shapiro Wilk test, Student's t test and U test of Mann-Whitney. It is concluded that Damon System produces a statistically significant increase of the inter-molar distance and incisive protrusion after treatment and performs a self-limiting expansion with a predictable end staying within or with no significant differences in the values programmed at baseline. On the other hand, MBT system it does not produce statistically significant differences pre and post treatment to inter-canine level, but it does at the inter-first premolar level