The Effects of Dysport Injection on the Relapse of BSSRO Surgery
Methods : The investigation included 18 patients (8 males, 10 females) whose malocclusions were treated by BSSRO surgery from Jan. 2008 to Dec. 2013, retrospectively. The patients were categorized as Dysport injected group(n=10) and non- injected group(n=8). The same patients were also grouped into two other independent groups, depending on whether they wore wafer longer (n= 12) or shorter (n=6) than one-month period. Amounts of mandibular relapse were then analyzed accordingly. The amount of mandibular setback and periods of pre-operative orthodontic treatment were also taken into considerations. Our investigation analyzed the effect of Dysport injection and wafer-wearing period using Mann-whitney analysis, and Pearson correlation was also performed to examine a relationship between the relapse amount and mandibular setback length or periods of pre-operative orthodontic treatment. All analysis was done using SPSS, version 17.0.
Results : Mandibles were setback with an average of 8.54mm and the average relapse ratio was 11.23%. There was no significant difference between the Dysport group and non-Dysport group. (p= .859) The difference was also not seen between the two groups wearing the surgical wafer longer or shorter than the one-month. (p=.925) There was no significant correlation between the amount of relapse and the amount of mandibular setback. (Pearson correlation ratio=.391, p=.109) Also, no significant correlation between the amount of relapse and periods of orthodontic treatment was found. (Pearson correlation ratio=-.42, p=.868)
Conclusion : There was no significant effect of the Dysport injection on the BSSRO setback surgery