AIM: To assess root parallelism after Invisalign® treatment.
MATERIALS AND METHODS: The sample consisted of 101 patients (mean
age: 22.7 years, 29 males, 72 females) treated non-extraction with Invisalign® by
one orthodontist. Root angulations were assessed using the 4-point angulation
tool (Dolphin imaging©); the long axes of adjacent teeth were traced, yielding a
convergence/divergence angle. Acceptable root parallelism was assessed if the
root angulation did not converge/diverge more than 7 degrees. Sites evaluated:
between 1st molars and 2nd premolars, 2nd and 1st premolars, lateral and central
incisors, and between central incisors in all four quadrants. The average change
in mesio-distal root angulation was assessed between pre- and post-treatment
panoramic radiographs.
RESULTS: Paired t-tests were used to analyze the average change in mesiodistal
root angulation. Statistically significant differences were obtained indicating
a reduction in the convergence/divergence angles between teeth #16-15, #15-14,
#11-21, #24-25, #25-26, #45-44, #42-41, #41-31, #31-32, and #34-35 (at p-value
<0.05). The average change in root angulation was not affected (p>0.05) by age
(Pearson correlation coefficient), gender, occlusion type (I, II, or III), or elastic
use (unpaired, 2 sample t-test at p<0.05). Intra and inter-rater reliability for 20%
of the studied sample was assessed using the interclass correlation coefficient
3
test. All measured areas except teeth #16-15, #26-25, and #36-35 yielded good
ICC reliability scores above 0.7.
CONCLUSION: Root parallelism was improved post-Invisalign® treatment in ten
of the fourteen areas evaluated. Thus, Invisalign® may be an effective treatment
modality in controlling root angulation in non-extraction cases. / May 2016
| Identifer | oai:union.ndltd.org:MANITOBA/oai:mspace.lib.umanitoba.ca:1993/31259 |
| Date | 22 April 2016 |
| Creators | Nemes, Jordan |
| Contributors | Hechter, Frank (Orthodontics: Preventive Dental Science), Piedade, Luis (Orthodontics: Preventive Dental Science), Todescan, Reynaldo (Restorative dentistry), Hechter, Frank (Orthodontics: Preventive Dental Science) Piedade, Luis (Orthodontics: Preventive Dental Science) Todescan, Reynaldo (Restorative dentistry) |
| Source Sets | University of Manitoba Canada |
| Detected Language | English |
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