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Predictability of expansion movements performed by clear aligners in mixed dentition in both arches: a retrospective study on digital casts.
- Source :
- BMC Oral Health; 6/15/2024, Vol. 24 Issue 1, p1-9, 9p
- Publication Year :
- 2024
-
Abstract
- Background: to evaluate the predictability of expansion achieved in patients in early mixed dentition treated with Clear Aligners (CA), analyzing the efficiency of the expansion at the end of the first set of aligners and at the end of the therapy in the upper and lower arch. Methods: 36 patients (20 F, 16 M; mean age 8.3 ± 1.5 years) were selected retrospectively from the Department of Orthodontics of the Hospital of Rome "Tor Vergata". All subjects were treated with CA with no other auxiliaries than attachments. For each patient a standardized sequential expansion protocol was planned for both arches. Digital dental casts were created at three observation periods from an intraoral scanner: prior to treatment (T0), at the end of the first set of aligners (T1), at the end of treatment (T2). The 3D models in planned position determined by the first Clincheck (CC) were obtained for comparison with T1 and T2. Six linear transversal measurements were used to evaluate the dimensional changes and the predictability of expansion movements, comparing T1-CC and T2-CC. Results: a statistically significant increase within the pre-treatment and the final outcomes for all the variables examined was found. In the upper arch, the greatest level of predictability was detected at the level of the first (46.44%) and second deciduous molar width (44.95%) at T1. The analysis of T2-CC changes showed a significant increase in the percentage of predictability of expansion at the level of the first permanent molars, at mesial (54.86%) and distal (58.92%) width. In the lower arch, a higher percentage of predictability than the upper arch was reported at T1-CC and T2-CC, with the greatest values at the level of second (T1-CC: 48.70%; T2-CC: 75.32%) and first deciduous molar width (T1-CC: 45.71%; T2-CC: 72.75%). Conclusions: CA can induce significant transversal increments. The predictability of expansion is variable, but it did not exceed the 50% during the first set of aligners. It was necessary to apply refinement set to achieve a good predictability for expansion of about 70%. The expansion in the lower arch was observed to be more predictable than in the upper arch. [ABSTRACT FROM AUTHOR]
- Subjects :
- TREATMENT of malocclusion
MIXED dentition
ORTHODONTICS
PREDICTION models
T-test (Statistics)
DATA analysis
STATISTICAL significance
DENTAL casting
DENTAL arch
CORRECTIVE orthodontics
TREATMENT effectiveness
RETROSPECTIVE studies
CEPHALOMETRY
DESCRIPTIVE statistics
ORTHODONTIC appliances
ANALYSIS of variance
STATISTICS
CONFIDENCE intervals
DATA analysis software
Subjects
Details
- Language :
- English
- ISSN :
- 14726831
- Volume :
- 24
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- BMC Oral Health
- Publication Type :
- Academic Journal
- Accession number :
- 177897643
- Full Text :
- https://doi.org/10.1186/s12903-024-04435-y