Comparison of the degree of external root resorption of lower incisors and canines when using the Forsus Spring® over the arch or as part of a Crossbow® device in a RCT

• Author / Creator

  Coutsiers Morell, Gaston F.

• Objective: Assess the degree of external root resorption among lower incisors and canines undergoing orthodontic movement with two Forsus® springs approaches.
  Materials and methods: The sample of this RCT consisted of 23 patients treated with Forsus® springs over the arch and in 20 patients as part of a Crossbow® set up. CBCT imaging was taken before and after full orthodontic treatment completion. DICOMs were analyzed with ITK-Snap®. The volume of lower incisors and canine roots were assessed through an automated segmentation with manual adjustment on a 2D slice-by-slice basis. Their apical displacement was measured using 3D-Slicer®. Factors such as gender, treatment time, time with brackets were also considered. A MANOVA analysis was applied.
  Results: No statistically significant difference on the percentage of root volume change in lower anterior teeth was found regardless of the treatment approach even when the above-listed co-variables were considered. The change was a decrease of 1.42% in the Crossbow® group and an increase of 0.27% in the Forsus® group.
  Conclusions: Both treatment modalities produced similar amounts of root volume changes without clinically relevant differences. This can be interpreted as no significant root volume changes during orthodontic treatment or the proposed measure technique was not able to detect the minimal amount of root volume changes that may have occurred.

• Subjects / Keywords

  • Crossbow
  • CBCT
  • Orthodontics
  • external root resorption
  • Frosus

• Graduation date

  Fall 2020

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-7zfj-3j44

• License

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