A study into the effects of different ligation techniques on mandibular incisor alignment
AbstractAims To determine whether ligation with figure of eight modules affects the rate of lower incisor alignment compared with conventionally tied modules and to establish whether there are any differences in the number of bracket failures between the two groups. Methods Ethical approval was obtained. Participants were randomly allocated to conventional module or figure of eight module groups, stratified for extraction or non extraction treatment. Lower labial segment alignment was measured on study models using Little's Irregularity Index at the start (TO) of treatment, at 6 weeks (Tl) and 12 weeks (T2). Case records were analysed to assess the number of bracket failures per patient. Results 100 subjects participated. In both groups the fastest rate of alignment was between TO and T1; 3.20mm/month and 3 .54mm/month in the conventional and figure of eight module groups respectively. The difference between the groups was not statistically significant. The bracket failure rate was also similar in both test groups; 4.4% for conventional and 3.6% for figure of eight ligation. Conclusions Ligation with the tighter figure of eight module configuration has no clinically significant effect on the rate of lower incisor alignment. Therefore it seems that figure of eight ligation does not hinder the alignment of the teeth. There were no differences in the average number of bracket failures per person.
Little, Rachel Ann (2016) A study into the effects of different ligation techniques on mandibular incisor alignment. M.Phil. thesis, University of Birmingham.