scholarly journals CBCT of skeletal changes following rapid maxillary expansion to increase arch-length with a development-dependent bonded or banded appliance

2013 ◽  
Vol 83 (5) ◽  
pp. 851-857 ◽  
Author(s):  
Ryuzo Kanomi ◽  
Toru Deguchi ◽  
Eriko Kakuno ◽  
Teruko Takano-Yamamoto ◽  
W. Eugene Roberts
Keyword(s):  
Three Dimensional ◽  
Pediatric Dentistry ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Older Children ◽  
Maxillary Expansion ◽  
Skeletal Changes ◽  
Skeletal Effects ◽  
3D Evaluation ◽  
Skeletal Expansion

ABSTRACT Objective: To assess the three-dimensional (3D) skeletal response to a standardized 5 mm of rapid maxillary expansion (RME) in growing children (6–15 years) with maxillary width deficiency and crowding. Materials and Methods: A bonded appliance was used prior to the eruption of the maxillary first premolars (Mx4s), and a banded appliance was used thereafter. A consecutive sample of 89 patients (29 boys and 60 girls) from a large pediatric dentistry and orthodontics practice was divided into four groups: 1) 6–8 years old (n  =  26), 2) 9–11 years old with unerupted Mx4s (n  =  21), 3) 9–11 years with erupted Mx4s (n  =  23), and 4) 12–15 years (n  =  19). For all patients, the 3D evaluation of dental and skeletal effects was performed with cone-beam computed tomography (CBCT). Results: For both appliances in all patients, CBCT confirmed a triangular pattern of expansion in both the frontal and sagittal planes. Overall, both appliances produced significant maxillary expansion (>80% of the 5-mm activation), but older children showed a progressively more dental (less skeletal) response. Comparison of the two types of expanders in the crossover sample, children aged 9–11 years, showed that the bonded RME produced the most efficient skeletal expansion in the preadolescent sample. Increased maxillary width at the level of the zygomaticomaxillary suture was the best indicator for development of maxillary arch circumference. Conclusion: Development-dependent appliances (bonded RPE before Mx4s erupt, and a banded device thereafter) provided optimal RME treatment for all children from age 6–15 years.

scholarly journals Skeletal alterations associated with the use of bonded rapid maxillary expansion appliance

2011 ◽  
Vol 22 (4) ◽  
pp. 334-339 ◽  
Author(s):  
Moara de Rossi ◽  
Andiara de Rossi ◽  
Jorge Abrão
Keyword(s):  
Rapid Maxillary Expansion ◽  
Growth Patterns ◽  
Facial Growth ◽  
Maxillary Expansion ◽  
Skeletal Changes ◽  
End Of Treatment ◽  
The Face ◽  
Vertical Changes ◽  
Skeletal Effects ◽  
Cephalometric Study

Bonded maxillary expansion appliances have been suggested to control increases in the vertical dimension of the face after rapid maxillary expansion (RME). However, there is still no consensus in the literature about its real skeletal effects. The purpose of this prospective study was to evaluate, longitudinally, the vertical and sagittal cephalometric alterations after RME performed with bonded maxillary expansion appliance. The sample consisted of 26 children, with a mean age of 8.7 years (range: 6.9-10.9 years), with posterior skeletal crossbite and indication for RME. After maxillary expansion, the bonded appliance was used as a fixed retention for 3.4 months, being replaced by a removable retention subsequently. The cephalometric study was performed onto lateral radiographs, taken before treatment was started, and again 6.3 months after removing the bonded appliance. Intra-group comparison was made using paired t test. The results showed that there were no significant sagittal skeletal changes at the end of treatment. There was a small vertical skeletal increase in five of the eleven evaluated cephalometric measures. The maxilla displaced downward, but it did not modify the facial growth patterns or the direction of the mandible growth. Under the specific conditions of this research, it may be concluded that RME with acrylic bonded maxillary expansion appliance did promote signifciant vertical or sagittal cephalometric alterations. The vertical changes found with the use of the bonded appliance were small and probably transitory, similar to those occurred with the use of banded expansion appliances.

scholarly journals Short-term skeletal and dentoalveolar effects of overexpansion:

2021 ◽  
Author(s):  
Arun K. Bala ◽  
Phillip M. Campbell ◽  
Larry P. Tadlock ◽  
Emet D. Schneiderman ◽  
Peter H. Buschang
Keyword(s):  
Nasal Cavity ◽  
Skeletal Maturity ◽  
Controlled Trial ◽  
Rapid Maxillary Expansion ◽  
Skeletal Maturation ◽  
Control Group ◽  
Maxillary Expansion ◽  
Computed Tomography Scans ◽  
Skeletal Effects ◽  
Skeletal Expansion

ABSTRACT Objectives To evaluate whether the amount of rapid maxillary expansion differentially affects the skeletal and dentoalveolar changes that occur. Materials and Methods This randomized controlled trial included 23 patients who had rapid maxillary expansion (RME). Subjects were randomly assigned to a conventional expansion control group (n = 12) or an overexpansion group (n = 11), who started treatment at 13.2 ± 1.5 and 13.8 ± 1 years of age, respectively. Cone beam computed tomography scans (11 cm) were obtained prior to rapid maxillary expander (RME) delivery and approximately 3.7 months later. Initial hand-wrist radiographs were used to determine the participants' skeletal maturity. Results The RME screws were activated 5.6 ± 1.2 mm and 10.1 ± 0.6 mm in the conventional and overexpansion groups, respectively. Overexpansion produced significantly greater expansion of the nasal cavity (2.1X–2.5X), maxillary base (2.3X), buccal alveolar crest (1.4X), and greater palatine foramina (1.9X). Significantly greater intermolar width increases (1.8X) and molar inclination (2.8X) changes were also produced. The nasal cavity and maxillary base expanded 23%–32% as much as the screws were activated. Skeletal expansion was positively correlated with RME screw activation (R = 0.61 to 0.70) and negatively correlated (R = −0.56 to −0.64) with the patients' skeletal maturation indicators (SMIs). Together, screw activation and the patients' SMI scores explained 48%–66% of the variation in skeletal expansion. Conclusions This pilot study shows that overexpansion produces greater changes than conventional expansion, with greater skeletal effects among less mature patients.

Skeletal effects to the maxilla after rapid maxillary expansion assessed with cone-beam computed tomography

2008 ◽  
Vol 134 (1) ◽  
pp. 8.e1-8.e11 ◽  
Author(s):  
Brett J. Garrett ◽  
Joseph M. Caruso ◽  
Kitichai Rungcharassaeng ◽  
James R. Farrage ◽  
Jay S. Kim ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Skeletal Effects

scholarly journals Dentoskeletal effects of a temporary skeletal anchorage device–supported rapid maxillary expansion appliance (TSADRME): A pilot study

2015 ◽  
Vol 86 (2) ◽  
pp. 241-249 ◽  
Author(s):  
Jason William Vassar ◽  
Anastasios Karydis ◽  
Terry Trojan ◽  
Jack Fisher
Keyword(s):  
Rapid Maxillary Expansion ◽  
Great Variability ◽  
Cone Beam ◽  
Skeletal Anchorage ◽  
Maxillary Expansion ◽  
Linear Measurements ◽  
Palatal Expansion ◽  
Older Subjects ◽  
Temporary Skeletal Anchorage ◽  
Skeletal Expansion

ABSTRACT Objective:  To quantitatively evaluate maxillary skeletal expansion using cone-beam computed tomography (CBCT) images and propose a novel way to quantify the dental tipping effects of temporary skeletal anchorage device–supported rapid maxillary expansion appliance (TSADRME). Materials and Methods:  Images from 25 patients receiving rapid maxillary expansion with incorporated temporary skeletal anchorage devices (TSADs) before activation (T1) and after removal (T2) were analyzed to detect dentoskeletal changes. Results:  A significant increase from T1 to T2 was found for all linear measurements except buccal maxillary width at the canines. The greatest buccal expansion was at the first molar, decreasing anteriorly. However, the greatest palatal expansion was at the first premolar. All younger subjects (8–16 years old) exhibited less dental tipping and greater expansion overall compared with the older subjects. There was great variability in dental tipping of first molars (mean = 4.31°), with some subjects demonstrating mild uprighting of these teeth. Conclusions:  The TSADRME appliance is an effective, clinically useful device that results in mild molar tipping and may positively affect expansion in the area of TSAD placement.

scholarly journals Comparison of dimensions and volume of upper airway before and after mini-implant assisted rapid maxillary expansion

2020 ◽  
Vol 90 (3) ◽  
pp. 432-441 ◽  
Author(s):  
Qiming Li ◽  
Hongyi Tang ◽  
Xueye Liu ◽  
Qing Luo ◽  
Zhe Jiang ◽  
...  
Keyword(s):  
Nasal Cavity ◽  
Upper Airway ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Complex Structures ◽  
Direct Relation ◽  
Maxillary Expansion ◽  
Before And After ◽  
Skeletal Pattern ◽  
Skeletal Expansion

ABSTRACT Objectives To evaluate changes in dimensions and volume of upper airway before and after mini-implant assisted rapid maxillary expansion (MARME) and observe correlations between changes of upper airway and vertical skeletal pattern in young adults. Materials and Methods In this retrospective study, 22 patients (mean age, 22.6 ± 4.5 years; 4 male 18 female) with transverse discrepancy underwent MARME. Cone beam computed tomography was taken before and 3 months after expansion. Vertical and horizontal dimensions and volume of the nasal cavity, nasopharyngeal, retropalatal, retroglossal and hypopharyngeal airway were compared before and after MARME. Correlations between changed volume and dimensions were explored, as well as the vertical skeletal pattern. Results Nasal osseous width, maxillary width, volume of the nasal cavity and nasopharynx increased significantly (P < .05). Enlarged nasopharyngeal volume correlated with increased nasal width at the PNS plane (P < .05). There were no correlations between expanded volume and maxillary width. No measurements except nasal cavity volume had a correlation with Sum angle. Increased maxillary width correlated negatively with hard palate thickness (P < .05). Conclusions (1) MARME caused an increase in volume of the nasal cavity and nasopharynx, with expansion of nasal osseous width and maxillary width. (2) Enlarged nasal width at the PNS plane contributed to the increase in nasopharynx volume. Enlarged maxillary width showed no direct relation with increased volume. (3) In this study, it was unclear about the association between changes of the upper airway and vertical skeletal pattern because of complex structures. (4) Palate thickness affected skeletal expansion of the maxilla in MARME.

scholarly journals An assessment of the maxilla after rapid maxillary expansion using cone beam computed tomography in growing children

2014 ◽  
Vol 19 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Jessica L. Woller ◽  
Ki Beom Kim ◽  
Rolf G. Behrents ◽  
Peter H. Buschang
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Midpalatal Suture ◽  
Three Dimensional Images

INTRODUCTION: With the advent of cone beam computed tomography (CBCT), it is now possible to quantitatively evaluate the effects of rapid maxillary expansion (RME) on the entire maxillary complex in growing patients. OBJECTIVE: The purpose of this study is to use three-dimensional images to evaluate the displacement that occurs at the circummaxillary sutures (frontonasal, zygomaticomaxillary, intermaxillary, midpalatal, and transpalatal sutures) following rapid maxillary expansion in growing children. METHODS: The CBCT scans of 25 consecutively treated RME patients (10 male, 15 female) with mean age of 12.3 ± 2.6 years, were examined before expansion and immediately following the last activation of the expansion appliance. RESULTS: Statistically significant (P < 0.05) amounts of separation were found for the displacement of the bones of the frontonasal suture, the intermaxillary suture, the zygomaticomaxillary sutures, and the midpalatal suture. The change in angulation of the maxillary first molars due to RME was also statistically significant. There was no statistically significant displacement of the transpalatal suture. CONCLUSIONS: Rapid maxillary expansion results in significant displacement of the bones of circummaxillary sutures in growing children.

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