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

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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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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Peri-implant evaluation of osseointegrated implants subjected to orthodontic forces: results after three years of functional loading

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.21.2.073-080.oar ◽

2016 ◽

Vol 21 (2) ◽

pp. 73-80 ◽

Cited By ~ 2

Author(s):

Bruna de Rezende Marins ◽

Suy Ellen Pramiu ◽

Mauro Carlos Agner Busato ◽

Luiz Carlos Marchi ◽

Adriane Yaeko Togashi

Keyword(s):

Test Group ◽

Control Group ◽

Orthodontic Anchorage ◽

Clinical Evaluations ◽

Implant Placement ◽

Osseointegrated Implants ◽

Probing Depth ◽

Significant Difference ◽

Orthodontic Forces

ABSTRACT Objective: The objective of this study was to clinically and radiographically assess the peri-implant conditions of implants used as orthodontic anchorage. Methods: Two groups were studied: 1) a test group in which osseointegrated implants were used as orthodontic anchorage, with the application of 200-cN force; and 2) a control group in which implants were not subjected to orthodontic force, but supported a screw-retained prosthesis. Clinical evaluations were performed three, six and nine months after prosthesis installation and 1- and 3-year follow-up examinations. Intraoral periapical radiographs were obtained 30 days after surgical implant placement, at the time of prosthesis installation, and one, two and three years thereafter. The results were compared by Kruskal-Wallis test. Results: There was no statistically significant difference in clinical probing depth (p = 0.1078) or mesial and distal crestal bone resorption (p = 0.1832) during the study period. After three years of follow-up, the mean probing depth was 2.21 mm for the control group and 2.39 mm for the test group. The implants of the control group showed a mean distance between the bone crest and implant shoulder of 2.39 mm, whereas the implants used as orthodontic anchorage showed a mean distance of 2.58 mm at the distal site. Conclusion: Results suggest that the use of stable intraoral orthodontic anchorage did not compromise the health of peri-implant tissues or the longevity of the implant.

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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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Rapid maxillary expansion and external root resorption in man: A scanning electron microscope study

American Journal of Orthodontics ◽

10.1016/0002-9416(81)90356-0 ◽

1981 ◽

Vol 79 (6) ◽

pp. 630-652 ◽

Cited By ~ 103

Author(s):

A.F. Barber ◽

M.R. Sims

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Microscope Study ◽

Electron Microscope Study ◽

Root Resorption ◽

Rapid Maxillary Expansion ◽

Maxillary Expansion ◽

Scanning Electron Microscope Study ◽

External Root Resorption ◽

Scanning Electron

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Three-dimensional evaluation of upper airway following rapid maxillary expansion: A CBCT study

The Angle Orthodontist ◽

10.2319/012313-71.1 ◽

2013 ◽

Vol 84 (2) ◽

pp. 265-273 ◽

Cited By ~ 52

Author(s):

Hakan El ◽

Juan Martin Palomo

Keyword(s):

Three Dimensional ◽

Upper Airway ◽

Rapid Maxillary Expansion ◽

Control Group ◽

Nasal Passage ◽

Maxillary Expansion ◽

Oropharyngeal Airway ◽

Significant Difference ◽

Group A ◽

Maxillary Constriction

ABSTRACT Objectives: To evaluate, by using cone beam computed tomography, the skeletal, dental, oropharyngeal (OP) airway volume, and nasal passage (NP) volume changes that occur after rapid maxillary expansion (RME). Materials and Methods: Two groups were selected, each with 35 patients (15 males, 20 females), an RME group (mean age, 14.02 ± 1.46 years) and a control group (mean age, 14.10 ± 1.44 years). The RME group consisted of patients with maxillary constriction who were treated with Hyrax palatal expanders, and the control group comprised age- and sex-matched patients who underwent comprehensive orthodontic treatment without the use of a rapid maxillary expander. Results: All of the transverse skeletal (medial orbital width, lateral nasal width, maxillary width, and mandibular width) and interdental (intermolar, interpremolar, and intercanine) parameters were significantly enlarged in the RME group. A statistically significant increase in airway variables was seen in both groups between pretreatment (T0) and final records (T1). The mean increase of NP airway volume for the RME group (1719.9 ± 1510.7 mm3) was twofold compared with the control group (813.6 ± 1006.7 mm3), and no intergroup significant difference was found for the OP volume. Conclusions: Rapid maxillary expansion creates a significant increase in nasal passage airway volume but no significant change in the oropharyngeal airway volume.

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Evaluation and comparison of root resorption between tooth-borne and tooth-tissue borne rapid maxillary expansion appliances: A CBCT study

The Angle Orthodontist ◽

10.2319/010515-007.1 ◽

2015 ◽

Vol 86 (1) ◽

pp. 46-52 ◽

Cited By ~ 6

Author(s):

Furkan Dindaroğlu ◽

Servet Doğan

Keyword(s):

Repeated Measures ◽

Root Resorption ◽

Rapid Maxillary Expansion ◽

Maxillary Expansion ◽

Volumetric Measurement ◽

Root Volume ◽

Repeated Measures Analysis ◽

Significant Difference ◽

Tooth Tissue ◽

Fixed Retention

ABSTRACT Objective: To compare volumetric root resorption after rapid maxillary expansion (RME) between tooth-borne and tissue-borne appliances using CBCT. Repair in resorption cavities after 6 months of fixed retention was also compared. Materials and Methods: A sample of 33 subjects were randomly divided into two groups: Hyrax (n = 16) and Haas (n = 17). CBCT scans were taken 6 months before expansion, immediately after expansion, and 6 months after fixed retention. Mimics Innovation V 16.0 software was used for segmentation and volumetric measurement of 198 teeth. Bland-Altman plots, independent samples t test, repeated measures analysis of variance, and the Friedman test were used for statistical analysis. Results: Differences in root resorption after RME and repair after retention were not significant between the hyrax and Haas appliances or between male and female. Significant differences were found between preexpansion and postexpansion root volumes in the first premolars and molars—even in unattached second premolars. When the percentage of root volume loss is considered, no significant difference was found between the first premolar, second premolar, and first molar. Volumetric changes after 6 months of retention were not statistically significant. Conclusions: More resorption was observed in the Hyrax expander group. But it was not statistically significant. Repair was observed after 6 months of retention. Heavy RME forces affected premolars and molar similarly.

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

The Angle Orthodontist ◽

10.2319/022320-120.1 ◽

2020 ◽

Vol 91 (1) ◽

pp. 46-53

Author(s):

Cassie T. Truong ◽

Hyeran H. Jeon ◽

Puttipong Sripinun ◽

Ann Tierney ◽

Normand S. Boucher

Keyword(s):

Normal Growth ◽

Rapid Maxillary Expansion ◽

Control Group ◽

Long Term Effects ◽

Maxillary Expansion ◽

Hard Tissue ◽

Alar Base ◽

Significant Difference ◽

Term Evaluation

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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Effects of rapid maxillary expansion in cleft patients resulting from the use of two different expanders

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.2016-001.aop ◽

2016 ◽

Vol 21 (6) ◽

pp. 82-90 ◽

Cited By ~ 1

Author(s):

Daniel Santos Fonseca Figueiredo ◽

Lucas Cardinal ◽

Flávia Uchôa Costa Bartolomeo ◽

Juan Martin Palomo ◽

Martinho Campolina Rebello Horta ◽

...

Keyword(s):

Cleft Lip ◽

Cleft Lip And Palate ◽

Rapid Maxillary Expansion ◽

Cone Beam ◽

Tomographic Image ◽

Maxillary Expansion ◽

Downward Movement ◽

Computed Tomographic ◽

Significant Difference ◽

Maxillary Region

ABSTRACT Objective: The aim of this study was to evaluate the skeletal and dental effects of rapid maxillary expansion (RME) in cleft patients using two types of expanders. Methods: Twenty unilateral cleft lip and palate patients were randomly divided into two groups, according to the type of expander used: (I) modified Hyrax and (II) inverted Mini-Hyrax. A pretreatment cone-beam computed tomographic image (T0) was taken as part of the initial orthodontic records and three months after RME, for bone graft planning (T1). Results: In general, there was no significant difference among groups (p > 0.05). Both showed a significant transverse maxillary expansion (p < 0.05) and no significant forward and/or downward movement of the maxilla (p > 0.05). There was greater dental crown than apical expansion. Maxillary posterior expansion tended to be larger than anterior opening (p < 0.05). Cleft and non-cleft sides were symmetrically expanded and there was no difference in dental tipping between both sides (p > 0.05). Conclusions: The appliances tested are effective in the transverse expansion of the maxilla. However, these appliances should be better indicated to cleft cases also presenting posterior transverse discrepancy, since there was greater expansion in the posterior maxillary region than in the anterior one.

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A 3-D evaluation of transverse dentoalveolar changes and maxillary first molar root length after rapid or slow maxillary expansion in children

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.24.3.079-087.oar ◽

2019 ◽

Vol 24 (3) ◽

pp. 79-87 ◽

Cited By ~ 1

Author(s):

Helder Baldi Jacob ◽

Gerson Luiz Ulema Ribeiro ◽

Jeryl D. English ◽

Juliana da Silva Pereira ◽

Mauricio Brunetto

Keyword(s):

Root Length ◽

Root Formation ◽

Tooth Movement ◽

Root Resorption ◽

Root Apex ◽

Cone Beam ◽

Maxillary Expansion ◽

Bone Thickness ◽

Significant Difference ◽

Bone Changes

ABSTRACT Objective: The objective of the present study was to conduct a randomized clinical trial comparing the effects of rapid maxillary expansion (RME) and slow maxillary expansion (SME). Maxillary permanent first molar root length and tooth movement through the alveolus were studied using cone-beam computed tomography (CBCT). Methods: Subjects with maxillary transverse deficiencies between 7 and 10 years of age were included. Using Haas-type expanders, children were randomly assigned to two groups: RME (19 subjects, mean age of 8.60 years) and SME (13 subjects, mean age of 8.70 years). Results: Buccal cortical, buccal bone thicknesses and dentoalveolar width decreased in both groups. In the RME group the greatest decrease was related to distal bone thickness (1.26 mm), followed by mesial bone thickness (1.09 mm), alveolar width (0.57 mm), and the buccal cortical (0.19 mm). In the SME group the mesial bone thickness decreased the most (0.87 mm) and the buccal cortical decreased the least (0.22 mm). The lingual bone thickness increased in the RME and SME groups (0.56 mm and 0.42 mm, respectively). The mesial root significantly increased in the RME group (0.52 mm) and in the SME group (0.40 mm), possibly due to incomplete root apex formation at T1 (prior to installation of expanders). Conclusions: Maxillary expansion (RME and SME) does not interrupt root formation neither shows first molar apical root resorption in juvenile patients. Although slightly larger in the RME group than SME group, both activation protocols showed similar buccal bone thickness and lingual bone thickness changes, without significant difference; and RME presented similar buccal cortical bone changes to SME.

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