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Anchorage onto deciduous teeth: effectiveness of early rapid maxillary expansion in increasing dental arch dimension and improving anterior crowding.

Mutinelli S, Manfredi M, Guiducci A, Denotti G, Cozzani M - Prog Orthod (2015)

Bottom Line: However, replacing first permanent molars with the second deciduous molars seems to be an option to reduce some negative side effects during orthodontic treatment.The patients were compared with three balanced control groups (in total, 60 individuals) matched for gender.The Haas expander anchored to the deciduous teeth is effective in increasing the dental arch width in patients with a lateral cross-bite.

View Article: PubMed Central - PubMed

Affiliation: Private practice, via Brennero 260/B, 38121, Trento, Italy, sabrinamutinelli@orthodontics.it.

ABSTRACT

Background: Anchorage onto permanent dentition is a common procedure in rapid maxillary expansion. However, replacing first permanent molars with the second deciduous molars seems to be an option to reduce some negative side effects during orthodontic treatment. The purpose of this study was to evaluate the dental effect of rapid maxillary expansion with anchorage exclusively onto deciduous teeth performed in the first period of transition.

Methods: Twenty patients with a lateral cross-bite treated exclusively by a Haas expander in early mixed dentition were retrospectively analyzed before treatment, at appliance removal, and at 21 months out of retention. The sagittal and transverse dimensions, together with the inter-canine arch and irregularity index, were digitally measured on scanned images of dental casts. The patients were compared with three balanced control groups (in total, 60 individuals) matched for gender. Two control groups had the same canine dental class as the treated group at T1, were in the inter-transitional period, and either had or lacked a lateral cross-bite. The last control group was comprised of adolescents in permanent dentition with a dental class I. The statistical analysis was performed by means of repeated-measures ANOVA for paired data and one-way ANOVA, the Kruskal-Wallis test, and the Mann-Whitney test for independent measures (α-level p < 0.05).

Results: At the end of follow-up (inter-transitional period of dentition), the dental arch dimensions of treated patients were similar to those of adolescents with a dental class I and significantly wider than those of patients with a lateral cross-bite. Also, the anterior irregularity index was lower among patients who had undergone expansion treatments than in all untreated study participants.

Conclusions: The Haas expander anchored to the deciduous teeth is effective in increasing the dental arch width in patients with a lateral cross-bite. The dimensions of the dental arch were modified earlier toward the values of the permanent dentition.

No MeSH data available.


Case-control study design diagram
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Fig2: Case-control study design diagram

Mentions: Three control groups were selected from among the patients sequentially checked during either the orthodontic consult or the periodic check-up for caries. For two groups, the inclusion criteria were the same canine dental class and the male-to-female ratio as the study group. The dental age coincided with the inter-transitional period [12]. Patients in one of the two groups had a lateral cross-bite (mean age, 9 years; SD, 11 months), and those in the other were without a lateral cross-bite (mean age, 9 years and 2 months; SD, 1 year and 1 month). The last control group, adolescents in permanent dentition (mean age, 14 years and 4 months; SD, 2 years and 5 months), was in normal occlusion, presented the same male-to-female ratio as the study group, and had a full natural dental arch up to the first or second molars. Impressions were taken for each patient. The case-control study design diagram is shown in Fig. 2.Fig. 2


Anchorage onto deciduous teeth: effectiveness of early rapid maxillary expansion in increasing dental arch dimension and improving anterior crowding.

Mutinelli S, Manfredi M, Guiducci A, Denotti G, Cozzani M - Prog Orthod (2015)

Case-control study design diagram
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4495101&req=5

Fig2: Case-control study design diagram
Mentions: Three control groups were selected from among the patients sequentially checked during either the orthodontic consult or the periodic check-up for caries. For two groups, the inclusion criteria were the same canine dental class and the male-to-female ratio as the study group. The dental age coincided with the inter-transitional period [12]. Patients in one of the two groups had a lateral cross-bite (mean age, 9 years; SD, 11 months), and those in the other were without a lateral cross-bite (mean age, 9 years and 2 months; SD, 1 year and 1 month). The last control group, adolescents in permanent dentition (mean age, 14 years and 4 months; SD, 2 years and 5 months), was in normal occlusion, presented the same male-to-female ratio as the study group, and had a full natural dental arch up to the first or second molars. Impressions were taken for each patient. The case-control study design diagram is shown in Fig. 2.Fig. 2

Bottom Line: However, replacing first permanent molars with the second deciduous molars seems to be an option to reduce some negative side effects during orthodontic treatment.The patients were compared with three balanced control groups (in total, 60 individuals) matched for gender.The Haas expander anchored to the deciduous teeth is effective in increasing the dental arch width in patients with a lateral cross-bite.

View Article: PubMed Central - PubMed

Affiliation: Private practice, via Brennero 260/B, 38121, Trento, Italy, sabrinamutinelli@orthodontics.it.

ABSTRACT

Background: Anchorage onto permanent dentition is a common procedure in rapid maxillary expansion. However, replacing first permanent molars with the second deciduous molars seems to be an option to reduce some negative side effects during orthodontic treatment. The purpose of this study was to evaluate the dental effect of rapid maxillary expansion with anchorage exclusively onto deciduous teeth performed in the first period of transition.

Methods: Twenty patients with a lateral cross-bite treated exclusively by a Haas expander in early mixed dentition were retrospectively analyzed before treatment, at appliance removal, and at 21 months out of retention. The sagittal and transverse dimensions, together with the inter-canine arch and irregularity index, were digitally measured on scanned images of dental casts. The patients were compared with three balanced control groups (in total, 60 individuals) matched for gender. Two control groups had the same canine dental class as the treated group at T1, were in the inter-transitional period, and either had or lacked a lateral cross-bite. The last control group was comprised of adolescents in permanent dentition with a dental class I. The statistical analysis was performed by means of repeated-measures ANOVA for paired data and one-way ANOVA, the Kruskal-Wallis test, and the Mann-Whitney test for independent measures (α-level p < 0.05).

Results: At the end of follow-up (inter-transitional period of dentition), the dental arch dimensions of treated patients were similar to those of adolescents with a dental class I and significantly wider than those of patients with a lateral cross-bite. Also, the anterior irregularity index was lower among patients who had undergone expansion treatments than in all untreated study participants.

Conclusions: The Haas expander anchored to the deciduous teeth is effective in increasing the dental arch width in patients with a lateral cross-bite. The dimensions of the dental arch were modified earlier toward the values of the permanent dentition.

No MeSH data available.