scholarly journals Skeletal width changes after mini-implant–assisted rapid maxillary expansion (MARME) in young adults

2021 ◽  
Author(s):  
Hongyi Tang ◽  
Panpan Liu ◽  
Xueye Liu ◽  
Yingyue Hou ◽  
Wenqian Chen ◽  
...  
Keyword(s):  
Young Adults ◽  
Cortical Bone ◽  
Pearson Correlation ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Contributing Factors ◽  
Mini Implants ◽  
Pterygoid Plate ◽  
Pearson Correlation Analysis

ABSTRACT Objectives To observe skeletal width changes after mini-implant–assisted rapid maxillary expansion (MARME) and determine the possible factors that may affect the postexpansion changes using cone-beam computed tomography (CBCT) in young adults. Materials and Methods Thirty-one patients (mean age 22.14 ± 4.76 years) who were treated with MARME over 1 year were enrolled. Four mini-implants were inserted in the midpalatal region, and the number of activations ranged from 40 to 60 turns (0.13 per turn). CBCT was performed before MARME (T0), after activation (T1), and after 1 year of retention (T2). The mean period between T1 and T0 was 6 ± 1.9 months and between T2 and T1 was 13 ± 2.18 months. A paired t-test was performed to compare T0, T1, and T2. The correlations between the postexpansion changes and possible contributing factors were analyzed by Pearson correlation analysis. Results The widths increased significantly after T1. After T2, the palatal suture width decreased from 2.50 mm to 0.75 mm. From T1 to T2, decreases recorded among skeletal variables varied from 0.13 mm to 0.41 mm. This decrease accounted for 5.75% of the total expansion (2.26 mm) in nasal width (N-N) and 19.75% at the lateral pterygoid plate. A significant correlation was found between postexpansion change and palatal cortical bone thickness and inclination of the palatal plane (ANS-PNS/SN; P < .05). Conclusions Expanded skeletal width was generally stable after MARME. However, some amount of relapse occurred over time. Patients with thicker cortical bone of the palate and/or flatter palatal planes seemed to demonstrate better stability.

scholarly journals Alveolar bone changes after asymmetric rapid maxillary expansion

2014 ◽  
Vol 85 (5) ◽  
pp. 799-805 ◽  
Author(s):  
Mehmet Akin ◽  
Zeliha Muge Baka ◽  
Zehra Ileri ◽  
Faruk Ayhan Basciftci
Keyword(s):  
Cortical Bone ◽  
Alveolar Bone ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Unaffected Side ◽  
Posterior Teeth ◽  
Cortical Bone Thickness ◽  
Paired Samples ◽  
Affected Side

ABSTRACT Objective:  To quantitatively evaluate the effects of asymmetric rapid maxillary expansion (ARME) on cortical bone thickness and buccal alveolar bone height (BABH), and to determine the formation of dehiscence and fenestration in the alveolar bone surrounding the posterior teeth, using cone-beam computed tomography (CBCT). Materials and Methods:  The CBCT records of 23 patients with true unilateral posterior skeletal crossbite (10 boys, 14.06 ± 1.08 years old, and 13 girls, 13.64 ± 1.32 years old) who had undergone ARME were selected from our clinic archives. The bonded acrylic ARME appliance, including an occlusal stopper, was used on all patients. CBCT records had been taken before ARME (T1) and after the 3-month retention period (T2). Axial slices of the CBCT images at 3 vertical levels were used to evaluate the buccal and palatal aspects of the canines, first and second premolars, and first molars. Paired samples and independent sample t-tests were used for statistical comparison. Results:  The results suggest that buccal cortical bone thickness of the affected side was significantly more affected by the expansion than was the unaffected side (P < .05). ARME significantly reduced the BABH of the canines (P < .01) and the first and second premolars (P < .05) on the affected side. ARME also increased the incidence of dehiscence and fenestration on the affected side. Conclusions:  ARME may quantitatively decrease buccal cortical bone thickness and height on the affected side.

scholarly journals Nonsurgical miniscrew-assisted rapid maxillary expansion results in acceptable stability in young adults

2016 ◽  
Vol 86 (5) ◽  
pp. 713-720 ◽  
Author(s):  
Sung-Hwan Choi ◽  
Kyung-Keun Shi ◽  
Jung-Yul Cha ◽  
Young-Chel Park ◽  
Kee-Joon Lee
Keyword(s):  
Young Adults ◽  
Treatment Modality ◽  
Orthodontic Treatment ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Initial Examination ◽  
The Stability ◽  
Maxillary Deficiency ◽  
Time Point

ABSTRACT Objective:  To evaluate the stability of nonsurgical miniscrew-assisted rapid maxillary expansion (MARME) in young adults with a transverse maxillary deficiency. Materials and Methods:  From a total of 69 adult patients who underwent MARME followed by orthodontic treatment with a straight-wire appliance, 20 patients (mean age, 20.9 ± 2.9 years) with follow-up records (mean, 30.2 ± 13.2 months) after debonding were selected. Posteroanterior cephalometric records and dental casts were obtained at the initial examination (T0), immediately after MARME removal (T1), immediately after debonding (T2), and at posttreatment follow-up (T3). Results:  Suture separation was observed in 86.96% of subjects (60/69). An increase in the maxillary width (J-J; 1.92 mm) accounted for 43.34% of the total expansion with regard to the intermolar width (IMW) increase (4.43 mm; P < .001) at T2. The amounts of J-J and IMW posttreatment changes were −0.07 mm (P > .05) and −0.42 mm (P  =  .01), respectively, during retention. The postexpansion change in middle alveolus width increased with age (P < .05). The postexpansion change of interpremolar width (IPMW) was positively correlated with the amount of IPMW expansion (P < .05) but not with IMW. The changes of the clinical crown heights in the maxillary canines, first premolars, and first molars were not significant at each time point. Conclusions:  Nonsurgical MARME can be a clinically acceptable and stable treatment modality for young adults with a transverse maxillary deficiency.

scholarly journals Relationship Between the Thickness of Cortical Bone at Maxillary Mid-palatal Area and Facial Height Using CBCT

2015 ◽  
Vol 9 (1) ◽  
pp. 287-291 ◽  
Author(s):  
Masume Johari ◽  
Farzaneh Kaviani ◽  
Arman Saeedi
Keyword(s):  
Cortical Bone ◽  
Cross Sections ◽  
Cone Beam Ct ◽  
Treatment Modalities ◽  
Cortical Plate ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants ◽  
Facial Height ◽  
Incisive Foramen

Introduction : Orthodontic mini-implants have been incorporated into orthodontic treatment modalities. Adequate bone at mini-implant placement site can influence the success or failure of anchorage. The present study was to determine the thickness of cortical bone in the maxillary mid-palatal area at predetermined points for the placement of orthodontic mini-implants using Cone Beam CT technique in order to evaluate the relationship of these values with the facial height. Materials and Methods : A total of 161 patients, consisting of 63 males (39.13%) and 98 females (60.87%), were evaluated in the present study; 38% of the subjects had normal facial height, 29% had short face and 33% had long face. In order to determine which patient belongs to which facial height category, i.e. normal, long or short, two angular and linear evaluations were used: the angle between S-N and Go-Me lines and the S-Go/N-Me ratio. Twenty points were evaluated in all the samples. First the incisive foramen was located. The paracoronal cross-sections were prepared at distances of 4, 8, 16 and 24 mm from the distal wall of the incisive foramen and on each cross-section the mid-sagittal and para-sagittal areas were determined bilaterally at 3- and 6-mm distances (a total of 5 points). The thicknesses of the cortical plate of bone were determined at the predetermined points. Results : There was a significant relationship between the mean cortical bone thickness and facial height (p<0.01), with significantly less thickness in long faces compared to short faces. However, the thickness of cortical bone in normal faces was similar to that in long and short faces. Separate evaluation of the points showed that at point a16 subjects with short faces had thicker cortical bone compared to subjects with long and normal faces. At point b8 in long faces, the thickness of the cortical bone was significantly less than that in short and normal faces. At point d8, the thickness of the cortical bone in subjects with short faces was significantly higher than that in subjects with long faces. Conclusion : At the point a16 the cortical bone thickness in short faces was significantly higher than normal and long faces. The lower thickness of the cortical bone in the palatal area at points b8 and d8 in subjects with long faces might indicate a lower anchorage value of these points in these subjects.

scholarly journals MODERN PERSPECTIVES ON RAPID PALATAL EXPANSION

2021 ◽  
Vol 9 (5) ◽  
pp. 497-500
Author(s):  
Kinnari Markana ◽  
Keyword(s):  
Transverse Dimension ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Negative Effects ◽  
Palatal Expansion ◽  
Beneficial Effects ◽  
Rapid Palatal Expansion ◽  
Mini Implants ◽  
Maxillary Deficiency ◽  
Skeletal Expansion

Maxillary deficiency in the transverse dimension is a common problem in children. The conventional management of such malocclusion is with conventional rapid maxillary expansion. The beneficial effects of such an orthodontic therapy are explained in detail in the literature. But there are also negative effects of conventional rapid maxillary expansion. Thus, the improvements in the methods of expansion has led to discovery of miniscrew assisted rapid palatal expansion. The miniscrew assisted rapid palatal expansion are supported by mini implants and thus enable better skeletal expansion of maxilla. This article will discuss the favourable effects, negative effects, and clinical uses of conventional and miniscrew assisted rapid palatal expansion.

scholarly journals Assessment of changes in the nasal airway after nonsurgical miniscrew-assisted rapid maxillary expansion in young adults

2018 ◽  
Vol 88 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Soo-Yeon Kim ◽  
Young-Chel Park ◽  
Kee-Joon Lee ◽  
Andreas Lintermann ◽  
Sang-Sun Han ◽  
...  
Keyword(s):  
Young Adults ◽  
Nasal Cavity ◽  
Rapid Maxillary Expansion ◽  
Cross Sectional Area ◽  
Nasal Airway ◽  
Sectional Area ◽  
Maxillary Expansion ◽  
Cross Sectional ◽  
T1 And T2 ◽  
Observation Period

ABSTRACT Objectives: To evaluate changes in the volume and cross-sectional area of the nasal airway before and 1 year after nonsurgical miniscrew-assisted rapid maxillary expansion (MARME) in young adults. Materials and Methods: Fourteen patients (mean age, 22.7 years; 10 women, four men) with a transverse discrepancy who underwent cone beam computed tomography before (T0), immediately after (T1), and 1 year after (T2) expansion were retrospectively included in this study. The volume of the nasal cavity and nasopharynx and the cross-sectional area of the anterior, middle, and posterior segments of the nasal airway were measured and compared among the three timepoints using paired t-tests. Results: The volume of the nasal cavity showed a significant increase at T1 and T2 (P &lt; .05), while that of the nasopharynx increased only at T2 (P &lt; .05). The anterior and middle cross-sectional areas significantly increased at T1 and T2 (P &lt; .05), while the posterior cross-sectional area showed no significant change throughout the observation period (P &gt; .05). Conclusions: The results demonstrate that the volume and cross-sectional area of the nasal cavity increased after MARME and were maintained at 1 year after expansion. Therefore, MARME may be helpful in expanding the nasal airway.

scholarly journals Insertion torque, pull-out strength and cortical bone thickness in contact with orthodontic mini-implants at different insertion angles

2013 ◽  
Vol 35 (6) ◽  
pp. 766-771 ◽  
Author(s):  
T. M. Meira ◽  
O. M. Tanaka ◽  
M. M. Ronsani ◽  
I. T. Maruo ◽  
O. Guariza-Filho ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Insertion Torque ◽  
Bone Thickness ◽  
Cortical Bone Thickness ◽  
Mini Implants ◽  
Pull Out ◽  
Pull Out Strength

The effect of surgically assisted rapid maxillary expansion on sleep architecture: an exploratory risk study in healthy young adults

2013 ◽  
Vol 40 (11) ◽  
pp. 818-825 ◽  
Author(s):  
N. Bach ◽  
H. Tuomilehto ◽  
C. Gauthier ◽  
A. Papadakis ◽  
C. Remise ◽  
...  
Keyword(s):  
Young Adults ◽  
Rapid Maxillary Expansion ◽  
Sleep Architecture ◽  
Maxillary Expansion

scholarly journals Buccal alveolar bone changes following rapid maxillary expansion and fixed appliance therapy

2020 ◽  
Author(s):  
Adam Sperl ◽  
Laurence Gaalaas ◽  
John Beyer ◽  
Thorsten Grünheid
Keyword(s):  
Computed Tomography ◽  
Alveolar Bone ◽  
Treatment Time ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Bone Thickness ◽  
Fixed Appliance ◽  
Computed Tomography Scans ◽  
Bone Changes

ABSTRACT Objectives To assess factors that may be associated with buccal bone changes adjacent to maxillary first molars after rapid maxillary expansion (RME) and fixed appliance therapy. Materials and Methods Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were obtained from 45 patients treated with RME and preadjusted edgewise appliances. Buccal alveolar bone thickness was measured adjacent to the mesiobuccal root of the maxillary first molar 4 mm, 6 mm, and 8 mm apical to the cementoenamel junction, and anatomic defects were recorded. Paired and unpaired t-tests were used to compare alveolar bone thickness at T1 and T2 and to determine whether teeth with posttreatment anatomic defects had thinner initial bone. Correlation analyses were used to examine relationships between buccal alveolar bone thickness changes and amount of expansion, initial bone thickness, age at T1, postexpansion retention time, and treatment time. Results There was a statistically significant reduction in buccal alveolar bone thickness from T1 to T2. Approximately half (47.7%) of the teeth developed anatomic defects from T1 to T2. These teeth had significantly thinner buccal bone at T1. Reduction in alveolar bone thickness was correlated with only one tested variable: initial bone thickness. Conclusions RME and fixed-appliance therapy can be associated with significant reduction in buccal alveolar bone thickness and an increase in anatomic defects adjacent to the expander anchor teeth. Anchor teeth with greater initial buccal bone thickness have less reduction in buccal bone thickness and are less likely to develop posttreatment anatomic defects of buccal bone.

Sign in / Sign up

Export Citation Format

Share Document