Rapid palatal expansion effects on mandibular transverse dimensions in unilateral posterior crossbite patients: a three-dimensional digital imaging study

The aim is to evaluate the effects of slow maxillary expansion on maxillary and mandibular arch, using a slow maxillary expander (SME-Leaf Expander) banded on primary second molar. Ninety patients with transverse maxillary deficiency and posterior crossbite were selected. Sixty-nine patients (33 males/36 females; 7.6 ± 1.7 years old) who underwent SME and 21 patients (10 males/11 females; 7.4 ± 1.2 years old) who were treated with rapid maxillary expander (RME). Digital models obtained pre- and post-treatment at appliance removal (9 to 11 months) were processed by means of a 3D scanner (Trios 3, 3Shape D250 laser, Copenhagen, Denmark). Interdental width in both maxilla and mandible were measured with 3 SHAPE Ortho Analyzer. Four Maxillary and four mandibular interdental width were traced and evaluated. The adequate Student’s t-test (dependent or independent) was used to compare intra and intergroups interdental width differences (p < 0.05). The efficacy of the SME was confirmed both on maxillary and mandibular arch. All the maxillary and mandibular interdental widths increased significantly (p < 0.001). The comparison with the RME group showed significant statistical differences between the two treatments with a greater increase in primary first and second intermolar and canine width for the test group (p < 0.001). SME with Leaf Expander produced statistically significant effects for the correction of transverse maxillary deficiencies with a significant indirect effect on the mandibular arch.

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“…Spontaneous enlargement in the mandibular dentition under the influence of RME or SME have been reported previously [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 83%

Three-Dimensional Evaluation of Slow Maxillary Expansion with Leaf Expander vs. Rapid Maxillary Expansion in a Sample of Growing Patients: Direct Effects on Maxillary Arch and Spontaneous Mandibular Response

et al. 2020

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“…In an attempt to overcome these limitations, finite element analysis (FEA) may be used. FEA is used to predict stress effects on mini-implants and surrounding bone [ 10 ], to determine the stresses in bracket-cement-enamel systems [ 11 ], to assess the effects of rapid maxillary expansion on the airway flow rate [ 12 ], and to evaluate the effects of orthodontic devices on tooth displacement trends. FEA also [ 13 ] provides information about the distributions and vector directions of the principal stresses on the periodontal ligament [ 14 – 16 ] and along bone structures [ 17 – 19 ].…”

Section: Introductionmentioning

confidence: 99%

Tridimensional finite element analysis of teeth movement induced by different headgear forces

et al. 2016

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BackgroundThis study aimed to simulate the actions of low-pull (LP), high-pull (HP), and combined pull (CP) headgears (HGs) and to analyze tooth movement tendencies through finite element analysis.MethodsTomographic slices of a human maxilla with complete permanent dentition were processed by reconstruction software, and the triangular surface mesh was converted into non-uniform rational B-spline (NURBS) curves. An HG facial bow was also modulated in 3D. The teeth and bone were considered to have isotropic and linear behavior, whereas the periodontal ligament was considered to have non-linear and hyperelastic behavior. Data regarding the application points, directions and magnitudes of forces were obtained from the literature and from a dolichofacial patient with class II, division 1 malocclusion, who was treated with a CP HG.ResultsThe CP HG promoted 37.1 to 41.1 %, and the HP HG promoted 19.1 to 31.9 % of LP distalization. The HP HG presented the highest intrusion, and the LP HG presented the highest extrusion of the first molar. The LP HG contracted the distal side, and the HP and CP HGs contracted the lingual and distobuccal roots of the second molar to a lesser degree.ConclusionsThe LP HG promotes the greatest distalization, followed by the CP and HP HGs; the LP HG causes greater extrusion of the first molar, and the HP HG causes greater intrusion of the first molar. The LP HG causes greater contraction of the second molar than the HP HG.

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“…Ugolini et al 65 published a study in 2016 on the effects of rapid maxillary expansion on the mandible. The study included a subject group of patients with a mean age of 8.5 years as well as a control group.…”

Section: •The Mandiblementioning

confidence: 99%

Mini-implant assisted rapid palatal expansion: New perspectives

Montigny

2017

J Dentofacial Anom Orthod

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Transversal anomalies are very common in clinical practice. In 80% of cases, their interceptive treatment is essential and must be administered as soon as possible to avoid periodontal, joint, or functional problems. It is based on an orthopedic technique aimed at separating the two maxillae above the level of the intermaxillary palatal suture. In 1860 2 , Angell who first described rapid maxillary expansion, which was very quickly discredited; however, since the 1960s it has been most widely used treatment in our arsenal. Conventionally, rapid maxillary expansion is performed in children who are still growing (no suture synostosis; at approximately 12 years), using a disjunctor (described by Biederman) supported by the teeth (two or four rings) and using a median activator twice a day, or 0.5 mm per day. Many studies, including meta-analyses, have

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Rapid palatal expansion effects on mandibular transverse dimensions in unilateral posterior crossbite patients: a three-dimensional digital imaging study

Cited by 32 publications

References 24 publications

Three-Dimensional Evaluation of Slow Maxillary Expansion with Leaf Expander vs. Rapid Maxillary Expansion in a Sample of Growing Patients: Direct Effects on Maxillary Arch and Spontaneous Mandibular Response

Three-Dimensional Evaluation of Slow Maxillary Expansion with Leaf Expander vs. Rapid Maxillary Expansion in a Sample of Growing Patients: Direct Effects on Maxillary Arch and Spontaneous Mandibular Response

Tridimensional finite element analysis of teeth movement induced by different headgear forces

Mini-implant assisted rapid palatal expansion: New perspectives

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