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Maxillary molar distalization with aligners in adult patients: a multicenter retrospective study.

Ravera S, Castroflorio T, Garino F, Daher S, Cugliari G, Deregibus A - Prog Orthod (2016)

Bottom Line: No significant movements were detected on the lower arch.SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown.

View Article: PubMed Central - PubMed

Affiliation: Post-Graduate School of Orthodontics, Lingotto - Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy. serenaravera@gmail.com.

ABSTRACT

Background: The aim of the present study was to test the hypothesis that bodily maxillary molar distalization was not achievable in aligner orthodontics.

Methods: Forty lateral cephalograms obtained from 20 non-growing subjects (9 male, 11 female; average age 29.73 years) (group S), who underwent bilateral distalization of their maxillary dentition with Invisalign aligners (Align Technology, Inc., San José, CA, USA), were considered for the study. Skeletal class I or class II malocclusion and a bilateral end-to-end class II molar relationship were the main inclusion criteria. Cephalograms were taken at two time points: (T0) pretreatment and (T2) post-treatment. Treatment changes were evaluated between the time points using 39 variables by means of paired t test. The level of significance was set at P < 0.05. Reproducibility of measurements was assessed by the intraclass correlation coefficient (ICC).

Results: The mean treatment time was 24.3 ± 4.2 months. At the post-treatment point, the first molar moved distally 2.25 mm without significant tipping (P = 0.27) and vertical movements (P = 0.43). The second molar distalization was 2.52 mm without significant tipping (P = 0.056) and vertical movements (P = 0.25). No significant movements were detected on the lower arch. SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).

Conclusions: Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown. No changes to the facial height were revealed.

No MeSH data available.


Related in: MedlinePlus

Pre- and post-photos of one of the patients treated in this study
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Fig6: Pre- and post-photos of one of the patients treated in this study

Mentions: In an adult patient, class II correction comes primarily from tooth movement without the benefits of growth and molar distalization could be usually performed to gain 2 to 3 mm of space in the dental arch to achieve a class I relationship [32]. In order to obtain this amount of movement, upper third molars, if present, should be extracted to have enough “room” to move second and first molars in end-to-end class II malocclusions (Figs. 5 and 6). Furthermore, considering that the correction comes primarily from tooth movement, more anchorage control is required [33].Fig. 5


Maxillary molar distalization with aligners in adult patients: a multicenter retrospective study.

Ravera S, Castroflorio T, Garino F, Daher S, Cugliari G, Deregibus A - Prog Orthod (2016)

Pre- and post-photos of one of the patients treated in this study
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834290&req=5

Fig6: Pre- and post-photos of one of the patients treated in this study
Mentions: In an adult patient, class II correction comes primarily from tooth movement without the benefits of growth and molar distalization could be usually performed to gain 2 to 3 mm of space in the dental arch to achieve a class I relationship [32]. In order to obtain this amount of movement, upper third molars, if present, should be extracted to have enough “room” to move second and first molars in end-to-end class II malocclusions (Figs. 5 and 6). Furthermore, considering that the correction comes primarily from tooth movement, more anchorage control is required [33].Fig. 5

Bottom Line: No significant movements were detected on the lower arch.SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown.

View Article: PubMed Central - PubMed

Affiliation: Post-Graduate School of Orthodontics, Lingotto - Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy. serenaravera@gmail.com.

ABSTRACT

Background: The aim of the present study was to test the hypothesis that bodily maxillary molar distalization was not achievable in aligner orthodontics.

Methods: Forty lateral cephalograms obtained from 20 non-growing subjects (9 male, 11 female; average age 29.73 years) (group S), who underwent bilateral distalization of their maxillary dentition with Invisalign aligners (Align Technology, Inc., San José, CA, USA), were considered for the study. Skeletal class I or class II malocclusion and a bilateral end-to-end class II molar relationship were the main inclusion criteria. Cephalograms were taken at two time points: (T0) pretreatment and (T2) post-treatment. Treatment changes were evaluated between the time points using 39 variables by means of paired t test. The level of significance was set at P < 0.05. Reproducibility of measurements was assessed by the intraclass correlation coefficient (ICC).

Results: The mean treatment time was 24.3 ± 4.2 months. At the post-treatment point, the first molar moved distally 2.25 mm without significant tipping (P = 0.27) and vertical movements (P = 0.43). The second molar distalization was 2.52 mm without significant tipping (P = 0.056) and vertical movements (P = 0.25). No significant movements were detected on the lower arch. SN^GoGn and SPP^GoGn angles showed no significant differences between pre- and post-treatment cephalograms (P = 0.22 and P = 0.85, respectively).

Conclusions: Aligner therapy in association with composite attachments and class II elastics can distalize maxillary first molars by 2.25 mm without significant tipping and vertical movements of the crown. No changes to the facial height were revealed.

No MeSH data available.


Related in: MedlinePlus