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Dental arch changes following rapid maxillary expansion.
Eur J Orthod. 2008 Oct; 30(5):469-76.EJ

Abstract

The purpose of this research was to evaluate changes in upper arch dimension and form following rapid maxillary expansion (RME) using a modified Haas appliance in the primary dentition. The sample comprised 49 children [17 males, 32 females, mean age 7 years 5 months, standard deviation (SD) 1 year 1 month] with a crossbite or maxillary crowding. Twenty patients had a normal SN-GoGn angle (7 males, 13 females, mean 33.25 degrees, SD 2.10), three were low angle (1 male, 2 females, mean 27.67 degrees, SD 2.31), and 22 were high angle (8 males, 14 females, mean 39.95 degrees, SD 3.15). The vertical dimensions of four patients could not be measured, due to the unavailability of radiographs. Expansion was undertaken to either correct a crossbite or treat maxillary crowding. The upper dental casts were analysed using a computerized system: before treatment (T1), at appliance removal (T2), and 2 years 4 months after appliance removal (T3). Using bootstrap statistical analysis applied to distance ratio values [Euclidean distance matrix analysis (EDMA)], it was found that 48 patients showed a change in arch form. In 40.82 per cent (n = 20, group A), the arch form changed from T1 to T2, T1 to T3, and T2 to T3. In 32.65 per cent (n = 16, group B), it varied from T1 to T2 but relapsed at T3 to the form of T1. For 24.5 per cent (n = 12, group C), it changed from T1 to T2 but maintained the same form at T3. The favourable characteristics for obtaining expansion, identified by logistic regression analysis, were being male, of an immature stage of dental development (lateral incisor not fully erupted) and the presence of a lateral crossbite. Intercanine and intermolar widths, arch length, and the distance between the interincisive point and the line joining the canines (depth of the intercanine arch) at the different time points were analysed using a two-tailed t-test (P < 0.05). For the whole group, the increase in intercanine and intermolar width and in the depth of the intercanine arch was significant. Comparison between groups A, B, and C was undertaken using an analysis of variance, but there was no significant difference between the groups. This modified type of Haas appliance was able to increase the transverse dimension of the maxillary dental arch in the mixed dentition. The most appropriate timing for treatment appears to be before the eruption of the permanent lateral incisors.

Authors+Show Affiliations

Department of Orthodontics, University of Ferrara, Italy. sabrinamutinelli@orthodontics.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18791124

Citation

Mutinelli, Sabrina, et al. "Dental Arch Changes Following Rapid Maxillary Expansion." European Journal of Orthodontics, vol. 30, no. 5, 2008, pp. 469-76.
Mutinelli S, Cozzani M, Manfredi M, et al. Dental arch changes following rapid maxillary expansion. Eur J Orthod. 2008;30(5):469-76.
Mutinelli, S., Cozzani, M., Manfredi, M., Bee, M., & Siciliani, G. (2008). Dental arch changes following rapid maxillary expansion. European Journal of Orthodontics, 30(5), 469-76. https://doi.org/10.1093/ejo/cjn045
Mutinelli S, et al. Dental Arch Changes Following Rapid Maxillary Expansion. Eur J Orthod. 2008;30(5):469-76. PubMed PMID: 18791124.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dental arch changes following rapid maxillary expansion. AU - Mutinelli,Sabrina, AU - Cozzani,Mauro, AU - Manfredi,Mario, AU - Bee,Marco, AU - Siciliani,Giuseppe, Y1 - 2008/09/12/ PY - 2008/9/16/pubmed PY - 2009/1/28/medline PY - 2008/9/16/entrez SP - 469 EP - 76 JF - European journal of orthodontics JO - Eur J Orthod VL - 30 IS - 5 N2 - The purpose of this research was to evaluate changes in upper arch dimension and form following rapid maxillary expansion (RME) using a modified Haas appliance in the primary dentition. The sample comprised 49 children [17 males, 32 females, mean age 7 years 5 months, standard deviation (SD) 1 year 1 month] with a crossbite or maxillary crowding. Twenty patients had a normal SN-GoGn angle (7 males, 13 females, mean 33.25 degrees, SD 2.10), three were low angle (1 male, 2 females, mean 27.67 degrees, SD 2.31), and 22 were high angle (8 males, 14 females, mean 39.95 degrees, SD 3.15). The vertical dimensions of four patients could not be measured, due to the unavailability of radiographs. Expansion was undertaken to either correct a crossbite or treat maxillary crowding. The upper dental casts were analysed using a computerized system: before treatment (T1), at appliance removal (T2), and 2 years 4 months after appliance removal (T3). Using bootstrap statistical analysis applied to distance ratio values [Euclidean distance matrix analysis (EDMA)], it was found that 48 patients showed a change in arch form. In 40.82 per cent (n = 20, group A), the arch form changed from T1 to T2, T1 to T3, and T2 to T3. In 32.65 per cent (n = 16, group B), it varied from T1 to T2 but relapsed at T3 to the form of T1. For 24.5 per cent (n = 12, group C), it changed from T1 to T2 but maintained the same form at T3. The favourable characteristics for obtaining expansion, identified by logistic regression analysis, were being male, of an immature stage of dental development (lateral incisor not fully erupted) and the presence of a lateral crossbite. Intercanine and intermolar widths, arch length, and the distance between the interincisive point and the line joining the canines (depth of the intercanine arch) at the different time points were analysed using a two-tailed t-test (P < 0.05). For the whole group, the increase in intercanine and intermolar width and in the depth of the intercanine arch was significant. Comparison between groups A, B, and C was undertaken using an analysis of variance, but there was no significant difference between the groups. This modified type of Haas appliance was able to increase the transverse dimension of the maxillary dental arch in the mixed dentition. The most appropriate timing for treatment appears to be before the eruption of the permanent lateral incisors. SN - 1460-2210 UR - https://www.unboundmedicine.com/medline/citation/18791124/Dental_arch_changes_following_rapid_maxillary_expansion_ L2 - https://academic.oup.com/ejo/article-lookup/doi/10.1093/ejo/cjn045 DB - PRIME DP - Unbound Medicine ER -