scholarly journals Three-dimensional assessment of the spheno-occipital synchondrosis and clivus after tooth-borne and bone-borne rapid maxillary expansion:

2021 ◽  
Author(s):  
Rosalia Leonardi ◽  
Vincenzo Ronsivalle ◽  
Manuel O. Lagravere ◽  
Ersilia Barbato ◽  
Gaetano Isola ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Linear Measurements ◽  
Retention Period ◽  
Computed Tomography Images ◽  
Surface Models ◽  
Cranial Fossa ◽  
Dimensional Assessment ◽  
Maxillary Deficiency

ABSTRACT Objectives To assess changes in spheno-occipital synchondrosis after rapid maxillary expansion (RME) performed with conventional tooth-borne (TB) and bone-borne (BB) appliances. Materials and Methods This study included 40 subjects with transverse maxillary deficiency who received TB RME or BB RME. Cone-beam computed tomography images (CBCT) were taken before treatment (T0), and after a 6-month retention period (T1). Three-dimensional surface models of the spheno-occipital synchondrosis and basilar part of the occipital bone were generated. The CBCTs taken at T0 and T1 were registered at the anterior cranial fossa via voxel-based superimposition. Quantitative evaluation of Basion displacement was performed with linear measurements and Euclidean distances. The volume of the synchndrosis was also calculated for each time point as well as the Nasion-Sella-Basion angle (N-S-Ba°). All data were statistically analyzed to perform inter-timing and intergroup comparisons. Results In both groups, there was a small increment of the volume of the synchondrosis and of N-S-Ba° (P < .05). Basion showed a posterosuperior pattern of displacement. However, no significant differences (P > .05) were found between the two groups. Conclusions Although TB and BB RME seemed to have some effects on the spheno-occipital synchondrosis, differences were very small and clinically negligible.

scholarly journals Three‐dimensional assessment of craniofacial asymmetry in children with transverse maxillary deficiency after rapid maxillary expansion: A prospective study

2020 ◽  
Vol 23 (3) ◽  
pp. 300-312 ◽  
Author(s):  
Karine Evangelista ◽  
Carolina Ferrari-Piloni ◽  
Leandro Almeida Nascimento Barros ◽  
Melissa Ameloti Gomes Avelino ◽  
Lucia Helena Soares Cevidanes ◽  
...  
Keyword(s):  
Prospective Study ◽  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
A Prospective Study ◽  
Dimensional Assessment ◽  
Maxillary Deficiency

scholarly journals 3D mandibular positioning after rapid maxillary expansion in Class II malocclusion

2011 ◽  
Vol 22 (5) ◽  
pp. 428-434 ◽  
Author(s):  
Carolina Baratieri ◽  
Matheus Alves Jr ◽  
Eduardo Franzotti Sant’anna ◽  
Matilde da Cunha Gonçalves Nojima ◽  
Lincoln Issamu Nojima
Keyword(s):  
Lateral Displacement ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Class Ii ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Retention Period ◽  
Division 1 ◽  
Maxillary Constriction ◽  
Class Ii Division 1

This study investigated, using cone beam computed tomography (CBCT), the spatial mandibular positioning after rapid maxillary expansion (RME) in Class II Division 1 malocclusion. This prospective study evaluated 17 children (mean initial age 10.36 years old) presenting Class II, Division 1 malocclusion and skeletal maxillary constriction that underwent to RME Haas’ protocol. CBCT was performed before treatment (T1), immediately after the stabilization of expander screw (T2) and after the retention period of 6 months (T3). The scans were managed in Dolphin Imaging® 11.0 software, where landmarks (right and left condylion, right and left gonion, and menton) were positioned and measured in relation to sagittal, coronal and axial plane to verify, respectively, transverse, anteroposterior and vertical displacement of the mandible. Paired Student’s t-test was used to identify significant differences (p<0.05) between T1 and T2, T2 and T3, and T1 and T3. After RME, right and left gonion moved downward (1.11 mm and 0.89 mm) and menton displaced downward (1.90 mm) and backward (1.50 mm). During the retention period, only anteroposterior displacement was significant, with the right and left gonion (0.97 mm and 1.26 mm) and the menton (2.29 mm) moving forward. Three-dimensional assessment of the mandible in Class II Division 1 patients subjected to RME showed a transitory backward and downward mandibular positioning, without any lateral displacement. The 6-month retention period allowed the mandible shifting significantly forward, exhibiting a more anterior position compared with the initial condition, even remaining in a more downward direction.

scholarly journals Retrospective CBCT analysis of airway volume changes after bone-borne vs tooth-borne rapid maxillary expansion

2019 ◽  
Vol 89 (4) ◽  
pp. 566-574 ◽  
Author(s):  
Golnaz Kavand ◽  
Manuel Lagravère ◽  
Katherine Kula ◽  
Kelton Stewart ◽  
Ahmed Ghoneima
Keyword(s):  
Nasal Cavity ◽  
Three Dimensional ◽  
Upper Airway ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Retention Period ◽  
Maxillary Molars ◽  
Computed Tomography Images ◽  
Significant Difference ◽  
Cbct Analysis

ABSTRACT Objectives: To compare changes in upper airway volume after maxillary expansion with bone- and tooth-borne appliances in adolescents and to evaluate the dentoskeletal effects of each expansion modality. Materials and Methods: This retrospective study included 36 adolescents who had bilateral maxillary crossbite and received bone-borne maxillary expansion (average age: 14.7 years) or tooth-borne maxillary expansion (average age: 14.4 years). Subjects had two cone beam computed tomography images acquired, one before expansion (T1) and a second after a 3-month retention period (T2). Images were oriented, and three-dimensional airway volume and dentoskeletal expansion were measured. Analysis of variance was used to test for differences between the two expansion methods for pretreatment, posttreatment, and prepost changes. Paired t-tests were used to test for significance of prepost changes within each method. Results: Both groups showed significant increase only in nasal cavity and nasopharynx volume (P &lt; .05), but not oropharynx and maxillary sinus volumes. Intermolar and maxillary width increased significantly in both groups (P &lt; .05); however, the buccal inclination of maxillary molars increased significantly only in the tooth-borne group (P &lt; .05). There was no significant difference between tooth- and bone-borne expansion groups, except for the significantly larger increase in buccal inclination of the maxillary right first molar after tooth-borne expansion. Conclusions: In adolescents, both tooth- and bone-borne RME resulted in an increase in nasal cavity and nasopharynx volume, as well as expansion in maxillary intermolar and skeletal widths. However, only tooth-borne expanders caused significant buccal tipping of maxillary molars.

scholarly journals Evaluation of palate area before and after rapid maxillary expansion, using cone-beam computed tomography

2019 ◽  
Vol 24 (5) ◽  
pp. 40-45
Author(s):  
Carolina Bruder ◽  
Cristina Lucia Feijó Ortolani ◽  
Tatiana Araújo de Lima ◽  
Flavia Artese ◽  
Kurt Faltin Junior
Keyword(s):  
Computed Tomography ◽  
Surface Area ◽  
Cone Beam Computed Tomography ◽  
Repeated Measures ◽  
Rapid Maxillary Expansion ◽  
Cone Beam ◽  
P Value ◽  
Maxillary Expansion ◽  
Linear Measurements ◽  
Retention Period

ABSTRACT Objective: The aim of this study was to estimate the changes in the palate area after rapid maxillary expansion (RME) with the Hyrax expander in growing subjects, using cone beam computed tomography (CBCT). Methods: Fourteen patients (9 girls and 5 boys; mean age = 11.7 ± 2.4 years) who required RME as part of their orthodontic treatment were included in this study. CBCT records had been taken before RME treatment (T0), at the end of active expansion (T1) and after a 6-month retention period (T2). The CBCT scans were manipulated with Dolphin Imaging® version 11.7 Premium software, in which landmarks were positioned and measured in relation to sagittal, coronal and axial planes, to verify the palate surface area. In addition, linear measurements of the palatal depth and width were assessed. These measurements were compared by using analysis of variance (ANOVA) for repeated measures. A p-value smaller than 0.05 was considered statistically significant. Results: The palatal surface area and width significantly increased from T0 to T1, respectively by 9.27% and 9.71%, and both decreased in a non-significant manner from T1 to T2. The palatal depth had non-significant differences at T0, T1 and T2. Conclusions: RME promotes a significant gain in the surface area of the palate and an increase in intermolar width. The Hyrax appliance was effective for the treatment of maxillary atresia in growing patients. There was no vertical alteration of the palate. After a 6-month retention period, the maxilla transverse dimension and the surface area of the palate remained stable.

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 &lt; .001) at T2. The amounts of J-J and IMW posttreatment changes were −0.07 mm (P &gt; .05) and −0.42 mm (P  =  .01), respectively, during retention. The postexpansion change in middle alveolus width increased with age (P &lt; .05). The postexpansion change of interpremolar width (IPMW) was positively correlated with the amount of IPMW expansion (P &lt; .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 Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

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