Short-term and long-term effects of rapid maxillary expansion on the nasal soft and hard tissue:

ABSTRACT Objectives To evaluate nasal soft and hard tissue changes immediately post–rapid maxillary expansion (RME) and to assess the stability of these changes using cone beam computed tomography (CBCT). Materials and Methods A total of 35 treatment group (TG) patients (18 girls, 17 boys; 9.39 ± 1.4) had a pre-RME CBCT and a post-RME CBCT approximately 66 days after expansion, and 25 patients had a follow-up CBCT 2.84 years later. A total of 28 control group (CG; no RME) patients (16 girls, 12 boys; 8.81 ± 1.6) had an initial CBCT and a CBCT an average of 2.25 years later. Soft and hard tissue nasal landmarks were measured in transverse, sagittal, and coronal planes of space on CBCT scans. Differences within the same group were evaluated by paired t-tests or Wilcoxon signed-rank tests. Long-term comparisons between TG and CG were evaluated by independent-sample t-tests or Wilcoxon rank-sum tests. Results Immediately post-RME, there were statistically significant mean increases of 1.6 mm of alar base width, 1.77 mm of pyriform height, and 3.57 mm of pyriform width (P < .05). CG showed the significant increases over 2.25 years (P < .001). Compared with CG, the long-term evaluation of TG demonstrated only pyriform height and pyriform width showed a statistically significant difference (P < .01). Conclusions Although RME produced some significant increase on the nasal soft tissue immediately after expansion, it regressed to the mean of normal growth and development over time. However, long-term evaluation of TG compared with CG showed only pyriform height and pyriform width to be affected by RME.

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Long-term evaluation of rapid maxillary expansion and bite-block therapy in open bite growing subjects:

The Angle Orthodontist ◽

10.2319/102717-728.1 ◽

2018 ◽

Vol 88 (5) ◽

pp. 523-529 ◽

Cited By ~ 2

Author(s):

Manuela Mucedero ◽

Dimitri Fusaroli ◽

Lorenzo Franchi ◽

Chiara Pavoni ◽

Paola Cozza ◽

...

Keyword(s):

Rapid Maxillary Expansion ◽

Open Bite ◽

Control Group ◽

Long Term Effects ◽

Maxillary Expansion ◽

Bite Block ◽

Mandibular Molars ◽

Lateral Cephalograms ◽

Skeletal Pattern

ABSTRACT Objective: To evaluate the long-term effects of rapid maxillary expansion (RME) and posterior bite block (BB) in prepubertal subjects with dentoskeletal open bite. Materials and Methods: The treatment group (TG) comprised 16 subjects (14 girls, 2 boys) with dentoskeletal open bite with a mean age of 8.1 ± 1.1 years treated with RME and BB. Three consecutive lateral cephalograms were available before treatment (T1), at the end of the active treatment with the RME and BB (T2), and at a follow-up observation at least 4 years after the completion of treatment (T3). The TG was compared with a control group (CG) of 16 subjects (14 girls, 2 boys) matched for sex, age, and vertical skeletal pattern. An independent sample t-test was used to compare the T1 to T3, T1 to T2, and T2 to T3 cephalometric changes between the TG and the CG. Results: In the long term, the TG showed a significantly greater increase in overbite (+1.8 mm), reduced extrusion of maxillary and mandibular molars (−3.3 mm), and, consequently, a significant decrease in facial divergence (−2.8°) when compared with untreated subjects. Conclusions: The RME and BB protocol led to successful and stable recovery of positive overbite in 100% of the patients considered. Correction of open bite was associated with reduced extrusion of maxillary and mandibular molars with a significant improvement in vertical skeletal relationships when compared with the CG.

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Long-term effects of Class III treatment with rapid maxillary expansion and facemask therapy followed by fixed appliances

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1067/mod.2003.44 ◽

2003 ◽

Vol 123 (3) ◽

pp. 306-320 ◽

Cited By ~ 162

Author(s):

Patricia Vetlesen Westwood ◽

James A. McNamara ◽

Tiziano Baccetti ◽

Lorenzo Franchi ◽

David M. Sarver

Keyword(s):

Rapid Maxillary Expansion ◽

Class Iii ◽

Long Term Effects ◽

Maxillary Expansion ◽

Fixed Appliances ◽

Class Iii Treatment

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Changes in the Upper and Lower Pharyngeal Airway Spaces Associated with Rapid Maxillary Expansion

ISRN Dentistry ◽

10.5402/2012/290964 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 8

Author(s):

Fitin Aloufi ◽

Charles B. Preston ◽

Khalid H. Zawawi

Keyword(s):

Orthodontic Treatment ◽

Upper Airway ◽

Rapid Maxillary Expansion ◽

Lower Airway ◽

Control Group ◽

Maxillary Expansion ◽

Pharyngeal Airway ◽

Significant Difference ◽

And Gender ◽

Maxillary Constriction

Objectives. The primary objectives of this retrospective study were first to compare the upper and lower pharyngeal airway spaces between orthodontic patients with and without maxillary constriction and second to evaluate the effect of rapid maxillary expansion (RME) on these airway spaces. A secondary objective was to compare the mode of breathing between groups. Materials and Methods. The experimental (RME) group consisted of 30 patients (mean age, years, 16 boys and 14 girls) with maxillary constriction who were treated with hyrax-type RME. The control group comprised the records of age- and gender matched patients (mean age, years, 16 boys and 14 girls) with no maxillary constriction but requiring nonextraction comprehensive orthodontic treatment. Cephalometric measurements in the sagittal dimension of upper and lower airway spaces for the initial and final records were recorded. Mode of breathing and length of treatment were also compared. Results. The sagittal dimension of the upper airway increased significantly in the RME group ( mm) compared to the control group ( mm), . However, there was no significant difference in the lower pharyngeal airway measurement between the RME group () and the control group (), . There was no significant difference with respect to mode of breathing between the two groups (). Conclusion. Rapid maxillary expansion (RME) during orthodontic treatment may have a positive effect on the upper pharyngeal airway, with no significant change on the lower pharyngeal airway.

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Rapid maxillary expansion: Do banded teeth develop more external root resorption than non-banded anchorage teeth?

The Angle Orthodontist ◽

10.2319/011015-20.1 ◽

2015 ◽

Vol 86 (1) ◽

pp. 39-45 ◽

Cited By ~ 3

Author(s):

Débora C Martins ◽

Bernardo Q Souki ◽

Paula L Cheib ◽

Gerluza A.B Silva ◽

Igor D.G Reis ◽

...

Keyword(s):

Root Resorption ◽

Rapid Maxillary Expansion ◽

Control Group ◽

Maxillary Expansion ◽

Orthodontic Anchorage ◽

External Root Resorption ◽

Significant Difference ◽

Band Group ◽

Orthodontic Forces ◽

Root Surfaces

ABSTRACT Objective: To compare external root resorption (ERR) when bands and wires are used as orthodontic anchorage during rapid maxillary expansion (RME). Materials and Methods: Histologic analysis was performed on 108 sites from 18 maxillary first premolars and on 36 sites from six mandibular first premolars in nine subjects (mean age = 15.2 ± 1.4 years) 3 months after RME. Maxillary teeth were pooled into two groups (n = 54 each) according to the type of orthodontic anchorage (band group [BG] vs wire group [WG]). Anchorage type was randomly chosen in a split-mouth design. Mandibular first premolars, which were not subjected to orthodontic forces, were used as the control group (CG). Results: All premolars in the BG and WG showed ERR at the level of the cementum and dentin. Repair with cementum cells was observed in all resorption areas, but complete repair was rarely found. No statistically significant difference was found between the BG and WG with regard to the ERR. No association was found between the root height position (middle or cervical third) and the incidence of ERR. Buccal root surfaces showed a higher amount of ERR compared with the palatal and interproximal surfaces. ERR was not found in any teeth in the CG. Conclusion: All maxillary first premolars subjected to RME showed ERR and partial cementum repair. Banded teeth did not develop more ERR than nonbanded anchorage teeth.

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Does rapid maxillary expansion have long-term effects on airway dimensions and breathing?

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2011.02.019 ◽

2011 ◽

Vol 140 (2) ◽

pp. 146-156 ◽

Cited By ~ 63

Author(s):

Carolina Baratieri ◽

Matheus Alves ◽

Margareth Maria Gomes de Souza ◽

Mônica Tirre de Souza Araújo ◽

Lucianne Cople Maia

Keyword(s):

Rapid Maxillary Expansion ◽

Long Term Effects ◽

Maxillary Expansion ◽

Airway Dimensions

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Long-term effects of symphyseal distraction and rapid maxillary expansion on pharyngeal airway dimensions, tongue, and hyoid position

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2005.11.044 ◽

2007 ◽

Vol 132 (6) ◽

pp. 769-775 ◽

Cited By ~ 22

Author(s):

Sıddık Malkoç ◽

Serdar Üşümez ◽

Haluk İşeri

Keyword(s):

Rapid Maxillary Expansion ◽

Long Term Effects ◽

Maxillary Expansion ◽

Pharyngeal Airway ◽

Airway Dimensions

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Effects of rapid maxillary expansion on nasal mucociliary clearance

The Angle Orthodontist ◽

10.2319/121714-918.1 ◽

2015 ◽

Vol 86 (2) ◽

pp. 250-254

Author(s):

Hasan Babacan ◽

Cenk Doruk ◽

Ismail Onder Uysal ◽

Salim Yuce

Keyword(s):

Orthodontic Treatment ◽

Mucociliary Clearance ◽

Systemic Disease ◽

Rapid Maxillary Expansion ◽

Control Group ◽

Maxillary Expansion ◽

Positive Effects ◽

Significant Difference ◽

Orthodontic Patients ◽

Nasal Mucociliary Clearance

ABSTRACT Objective: To evaluate the changes in nasal mucociliary clearance in orthodontic patients after rapid maxillary expansion (RME) therapy. Materials and Methods: Forty-two children (25 boys and 17 girls) participated in this study. The RME group consisted of 21 patients (mean age, 13.8 years), who had undergone RME at the initiation of orthodontic treatment. The control group consisted of 21 subjects (mean age, 13.6 years), who were attending the department of orthodontics for active orthodontic treatment. The nasal mucociliary clearance was assessed by the saccharin test. Saccharin transit times (STTs) were measured for each treated subject before expansion (T1), after RME (T2), and after a 3-month retention period (T3). Records were obtained at the same time intervals for each group. Results: The STT decreased significantly in the RME group after expansion and retention (P < .05). A statistically significant difference was found when the STTs of the control and RME groups were compared after expansion and retention (P < .05). Conclusions: The STTs of young orthodontic patients with maxillary narrowness and without any history of nasal or systemic disease were within normal limits. However, RME increased the mucociliary clearance in patients who had maxillary narrowness, having positive effects on nasal physiology and increasing nasal cavity volume.

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