Rotational relapse of anterior teeth following orthodontic treatment and circumferential supracrestal fiberotomy

Abstract

Background/purpose Several factors cause relapse of orthodontically de-rotated teeth after appliance removal. Circumferential supracrestal fiberotomy (CSF) may release the tension on the supra-alveolar fibers following tooth de-rotation, thereby reducing the relapse risk. However, careful identification of the amount and location of relapse enables proper clinical evaluation. We aimed to determine the amount of orthodontic relapse following CSF for de-rotated anterior teeth. Materials and methods Eleven patients with 90 orthodontically de-rotated anterior teeth were enrolled. CSF was performed after orthodontic treatment, during fixed retainer placement. Rotational correction and relapse were measured on three casts (preorthodontic treatment, cast 1; postorthodontic treatment + CSF, cast 2; and 12-month follow-up, cast 3). The Wilcoxon test was used to assess significant differences in the tooth rotation angles between casts 1 and 2 and casts 2 and 3. The relationship between the magnitude of relapse and pretreatment severity of rotation was assessed by the point biserial correlation test. The Mann-Whitney U test helped in identifying significant differences in the amount of relapse between maxillary and mandibular teeth. Results The mean amount of rotational correction was 14.05°, while the mean amount and percentage of relapse were 1.1° and 10.8%, respectively [0.81° (8%) and 1.44° (14%) for maxillary and mandibular teeth, respectively]. The relapse amount was proportional to the pretreatment rotation severity, and it was larger for the mandibular canines. There was no significant difference in the amount of relapse between the maxillary and mandibular teeth ( P = 0.07). Conclusion Post-treatment rotational relapse of anterior teeth subjected to CSF was minimal and statistically insignificant after 1 year of follow-up. This validates the promising results of CSF when combined with appropriate mechanical retention for an adequate period.

TAD’s for the Derotation of 90° Rotated Maxillary Bicuspids

“…Rotated teeth are known to relapse more commonly, and the role of the periodontium has been extensively studied in this regard [ 20 , 21 ]. Reorientation and lack of reorganization of the supracrestal fibers are considered the main culprit for such relapse [ 22 ]. A surgical technique to sever these periodontal fibers was reported by Edwards [ 23 ] and was termed circumferential supracrestal fiberotomy (CSF).…”

New Metal Complexes with AZO ligand; Synthesis, Spectral Characterisation and Biological Evaluation

“…The orange-red precipitate was filtered out and recrystallized from ethanol, yielding 2.09g (65%) with, M.P. 255°C, Figure (1) Synthesis of Complexes: In a mixed ethanol-benzene solution, HL (0.2g, 0.62mmol) and CrCl3.6H2O (0.08g, 0.312mmol) were dissolved. Drops of NaOH (0.07g, 1.24mmol) were added to the aforementioned mixture.…”

“…The major spectra of the compounds, as well as their designations, are mentioned in (Table 3) and Chemical structure Figure (1), HL spectra exhibited a peak at 3267cm -1 due to the phenolic group's peak (OH). [17].…”

“…Azo compounds or dyes are distinguished by the presence of an azo group (-N=N-) in their structure that is conjugated with two separate or identical monocyclic or polycyclic aromatic or heteroaromatic systems [1,2]. Azo dyes are synthesized in two steps, the first of which is the formation of an aromatic diazonium ion from amine derivatives.…”

Fixed Flexible Spiral Wire Retainers and Unwanted Tooth Movements: A Case Report

“…Hawley or vacuum-formed retainers (VFR) can be taken off by the patient. Additional treatments used to prevent relapse are (1) small surgical procedures that cut the supra-crestal periodontal fibers around the teeth to reduce the chance of relapse [5] or (2) interproximal enamel reduction of the lower front teeth to create space for the corrected crowding and to compensate in advance for the expected reduction in the inter-canine width during aging [6].…”