Three-dimensional mandibular changes associated with Class II elastics and extractions treatment in adult patients

2021 ◽  
Author(s):  
Hong Liu ◽  
Xun Xi ◽  
Dongxu Liu
Keyword(s):  
Orthodontic Treatment ◽  
Morphological Changes ◽  
Three Dimensional ◽  
Class Ii ◽  
Initial Position ◽  
Virtual Reference ◽  
Morphological Alterations ◽  
3 Dimensional ◽  
Slight Rotation ◽  
Class Ii Elastics

Abstract Backgroud: The apllication of Class II elastic can induce the rotation of mandible and condylar response. The purpose of this study was to assess the positional and morphological alterations of mandible after orthodontic treatment with Class II elastic by using of 3-dimensional superimposition of pretreatment (T1), posttreatment (T2) and after retention (T3) CBCT data. Methods: With sequential 3D superimpositions that combined cranial base superimpositions with regional mandibular superimpositions, the virtual reference mandibles were placed to distinguish morphological changes from positional changes. The morphological changes and positional changes of mandibles were measured by comparing multiple combinations of reference and original mandibles respectively, and the corresponding paired t test was performed using SPSS (IBM SPSS version 23). Results: During orthodontic treatment (T1-T2), the mandibular molars were extruded, and the condyles were revealed apparent adaptive remodeling and upward/backward displacements. The mandible rotated backwardly and drifted backwardly/downwardly. The condylar growth and displacements were significantly different. The condylar growth did not induce isometric displacements and the forward rotation was restricted. Two years after retention (T2-T3), continuous morphological and positional changes occurred. The condylar remodeling and forward/downward displacements induced forward mandibular rotation and neutralized the backward rotation during treatment period (T1-T2). The overall positional changes (T1-T3) were translations with slight rotation. Statistically significant differences were found between the treatment and overall variables regarding the 3D rotation, condylar displacement, Pog displacement. And with the continuous morphological and positional changes, the condyle moved back to the initial position after the retention stage.Conclusion: Conclusions: the sequential 3D superimposition method can produce the reference mandibles and distinguish the morphological changes from positional alterations. The class II elastics induced mandibular complex changes including condylar adaptive remodeling and 3D rotation and translation. The condyles morphologically adapted to resist the rotation effects of Class II elastic.

scholarly journals Influence of Class II Elastics on Centric Relation and Centric Occlusion Discrepancy after Orthodontic Treatment

2017 ◽  
Vol 11 (4) ◽  
pp. 487-493
Author(s):  
Érico Marcel Gomes de-Carvalho ◽  
Maria Rita Esteves ◽  
Martinho Campolina Rebello Horta ◽  
Giordani Santos Silveira ◽  
Paulo Isaías Seraidarian
Keyword(s):  
Orthodontic Treatment ◽  
Class Ii ◽  
Centric Relation ◽  
Class Ii Elastics ◽  
Centric Occlusion

Tratamento da Classe II com Invisalign

2021 ◽  
Vol 14 (53) ◽  
pp. 107-119
Author(s):  
Alexandre Moro ◽  
Bruna Girotto Olinquevicz ◽  
Nathaly D. Morais ◽  
Stéffany dos Anjos Francisco ◽  
Francielle Topolski ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Treatment Plan ◽  
Treatment Options ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Clinical Report ◽  
Orthodontic Appliance ◽  
Dental Aesthetics ◽  
Tooth Extractions ◽  
Class Ii Elastics

Complete correction of Class II malocclusion in an adult patient is not an easy task. In a case with large skeletal discrepancy, orthognathic surgery is the treatment of choice. However, in case of slight or borderline discrepancy, other treatment options are available, such as tooth extractions and miniscrews. Intermediate cases can also be treated with Class II correctors and elastics. This clinical report presents the orthodontic treatment of a 25-year-old female patient with Class II malocclusion. Clinically, the maxilla was well positioned, and the mandible was slightly retruded. The patient presented vestibularized upper incisors, well-positioned lower incisors and opted for a more aesthetically attractive orthodontic appliance. The treatment plan included teeth leveling and aligning in both arches, Class II correction, establishment of Class I molar and canine relationships, correction of overjet and overbite, midline correction, and improvement of facial and dental aesthetics. The orthodontic treatment consisted of removable Invisalign aligners and Class II elastics.

scholarly journals Lip Morphological Changes in Orthodontic Treatment

2009 ◽  
Vol 79 (2) ◽  
pp. 256-264 ◽  
Author(s):  
Rafiqul Islam ◽  
Toru Kitahara ◽  
Lutfun Naher ◽  
Atsushi Hara ◽  
Akihiko Nakasima
Keyword(s):  
Adult Female ◽  
Orthodontic Treatment ◽  
Morphological Changes ◽  
Class Ii ◽  
Control Group ◽  
Upward Movement ◽  
Normal Occlusion ◽  
Division 1 ◽  
Before And After ◽  
Class Ii Division 1

Abstract Objective: To evaluate the morphological changes in the lips and to determine the degree of improvement in the smile after orthodontic treatment for Class II division 1 malocclusion. Materials and Methods: The sample subjects were divided into two groups: a group that consisted of 20 adult female patients with Angle Class II division 1 malocclusion and a control group that consisted of 28 adult female volunteers with normal occlusion. Frontal photographs were taken before and after orthodontic treatment, and 35 landmarks were placed on each tracing made from the photograph. Thereafter, landmarks were digitized into an x- and y-coordinate system with the subnasal point as the origin. The comparisons between pretreatment and posttreatment at rest and on smiling, and the comparisons between Class II division 1 and control group were made using Student's t-test. Results: Both the upper and lower lips in the smile of patients in the Class II division 1 pretreatment group were positioned downward, and the upward movement of the upper lip and mouth corners was smaller in comparison with the control group. These characteristics of the Class II smile improved after orthodontic treatment, but the differences with the control group remained unchanged immediately after treatment. Conclusion: The soft tissue morphology shows a relative improvement after orthodontic treatment.

scholarly journals Three-dimensional comparative evaluation of articular disc position and other temporomandibular joint morphology in Class II horizontal and vertical cases with Class I malocclusion:

2020 ◽  
Vol 90 (5) ◽  
pp. 707-714
Author(s):  
Zynul Ali Sirsmith John ◽  
Sunita S. Shrivastav ◽  
Ranjit Kamble ◽  
Eshita Jaiswal ◽  
Rajasbala Dhande
Keyword(s):  
Temporomandibular Joint ◽  
Orthodontic Treatment ◽  
Sagittal Plane ◽  
Three Dimensional ◽  
Class Ii ◽  
Class I ◽  
Articular Disk ◽  
Disc Position ◽  
Condylar Position ◽  
Mri Evaluation

ABSTRACT Objective To evaluate and compare articular disk position, condylar position, and joint spaces in Class II vertical, Class II horizontal, and Class I cases. The purpose was to assess the potential for development of temporomandibular disorders (TMDs) in the three groups. Materials and Methods A sample of 75 cases, 25 cases in each group of Class I, Class II vertical, and Class II horizontal, were selected based on inclusion and exclusion criteria. Magnetic resonance imaging (MRI) assessments were made with a 1.5-Tesla basic system with a closed-mouth technique for evaluating articular disk position in the sagittal and transverse planes, condylar position, and joint spaces in the sagittal plane. Philips 3.0 software was used to analyze the MR images. Results There was evidence of alterations in the temporomandibular joint (TMJ) morphology in both Class II vertical and Class II horizontal cases, with maximum discrepancy in Class II vertical cases. MRI evaluation suggested a tendency for antero-medial disk displacement with anteriorly positioned condyles in Class II vertical cases. The discrepancy was milder in the Class II horizontal group. Conclusions Class II vertical cases are more susceptible to the development of TMDs and should be subjected to TMJ evaluation before starting any orthodontic treatment to intercept and prevent a mild asymptomatic TMD from developing into a more severe form. Class II vertical cases should be subjected to MRI evaluation before starting any orthodontic treatment.

scholarly journals Thwarting predators? A three-dimensional perspective of morphological alterations in the freshwater crustacean Daphnia

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254263
Author(s):  
Martin Horstmann ◽  
Ralph Tollrian ◽  
Linda C. Weiss
Keyword(s):  
Morphological Changes ◽  
Three Dimensional ◽  
Foraging Strategies ◽  
Inducible Defenses ◽  
Predator Prey ◽  
Morphological Alterations ◽  
Morphological Adaptations ◽  
Freshwater Crustacean ◽  
Tadpole Shrimp ◽  
Interspecific Comparisons

Predation is a major selective agent, so that many taxa evolved phenotypically plastic defensive mechanisms. Among them are many species of the microcrustacean genus Daphnia, which respond to an increased predation risk by developing inducible morphological alterations. Some of these features are obvious and easily recognized, e.g., crests in D. longicephala, while others are rather hidden, such as the bulkier shape of D. magna induced by the presence of the tadpole shrimp Triops. In this study we investigated the extraordinary diversity of morphological adaptations in the presence of predators with different foraging strategies in six predator-prey systems. For the first time we were able to analyze the unexposed and predator-exposed morphs comprehensively using three-dimensional scanning and reconstruction. We show that morphological changes are manifold in appearance between species and predators, and go beyond what has been known from previous 2D analyses. This further demonstrates the enormous trait flexibility of Daphnia. Interestingly, we found that among this variety some species share morphological strategies to counter a predator, while others use a different strategy against the same predator. Based on these intra- and interspecific comparisons, we discuss the mechanisms by which the respective defense might operate. These data therefore contribute to a deeper understanding of the inducible defenses’ morphology as well as their diversified modes of operation in Daphnia, being a cornerstone for subsequent investigations, including the determination of costs associated with morphological change.

Tratamento de má oclusão Classe II com a técnica 3DBOT (Ortodontia fixa tridimensional sem bráquetes e ancoragem esquelética)

2020 ◽  
Vol 13 (52) ◽  
pp. 29-35
Author(s):  
Guaracy Fonseca Junior ◽  
Ney Tavares ◽  
Evelyne Pedroza de Andrade ◽  
Guilherme de Sá Barreto Mostaert Lócio ◽  
Frederico Melo Machado Filho ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Clinical Case ◽  
Three Dimensional ◽  
Class Ii ◽  
Skeletal Anchorage ◽  
Class Ii Malocclusion ◽  
Viable Option ◽  
Set Up ◽  
Absolute Control ◽  
Arch Shape

The 3DBOT technique (Three-Dimensional Orthodontic Treatment without Brackets) receives this name for performing movements in the 3 dimensions of the space without the use of brackets and with the help of technology through 3D set up. This technique includes advantages such as absolute control of protrusion / retrusion, control of the arch shape and the planned expansion, control of established vertical and anteroposterior movements. It is imperceptible and comfortable, in addition it is a straight and self-ligating technique that allows sliding when necessary. The objective of this work is to report a clinical case of Class II subdivision, using the 3DBOT technique with skeletal anchorage. The combination of the Versatile Skeletal Anchorage Plate on the palate and the 3DBOT technique proved to be a viable option for Class II malocclusion treatment.

scholarly journals Three-dimensional condylar changes from Herbst appliance and multibracket treatment: A comparison with matched Class II elastics

2020 ◽  
Vol 158 (4) ◽  
pp. 505-517.e6
Author(s):  
Robert Y. Wei ◽  
Arjun Atresh ◽  
Antonio Ruellas ◽  
Lucia H.S. Cevidanes ◽  
Tung Nguyen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Class Ii ◽  
Herbst Appliance ◽  
Class Ii Elastics

Morphological changes in the temporomandibular joint after orthodontic treatment for Angle Class II malocclusion

CRANIO® ◽  
2017 ◽  
Vol 36 (1) ◽  
pp. 35-43
Author(s):  
Daigo Koide ◽  
Kazuhiro Yamada ◽  
Ayane Yamaguchi ◽  
Toru Kageyama ◽  
Akira Taguchi
Keyword(s):  
Temporomandibular Joint ◽  
Orthodontic Treatment ◽  
Morphological Changes ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Angle Class Ii ◽  
Angle Class

scholarly journals Lip Morphological Changes and Differences before and after Orthodontic Treatment

2013 ◽  
Vol 1 (1) ◽  
pp. 5-12
Author(s):  
MR Islam ◽  
T Kitahara ◽  
L Naher ◽  
A Nakasima ◽  
I Takahashi
Keyword(s):  
Adult Female ◽  
Orthodontic Treatment ◽  
Morphological Changes ◽  
Class Ii ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Female Patients ◽  
Significant Difference ◽  
Before And After

Objectives: The objective of this study is to test the hypothesis that there is a difference in the morphology of the lips of Class II div 1 and Class III malocclusion, before and after orthodontic treatment. Methods: The sample subjects included 20 adult female patients with Angle Class II div 1 malocclusion and 30 adult female patients with dento-skeletal Class III malocclusion. Frontal photographs were taken both before and after orthodontic and/or orthognathic treatment. Thirty-five landmarks were placed on each tracing made from the photograph. Thereafter, landmarks were digitized into an x and y coordinates system with the subnasal point as the origin. The Class II pretreatment and posttreatment groups of rest and smile conditions were compared with the Class III group respectively, using t-tests. Results: In the Class II pretreatment group, upper and lower lips positioned downward than that in the Class III group. When smiling, there was no statistically significant difference between the two groups before treatment, whereas after orthodontic treatment both Class II and Class III groups showed the significant difference at rest and on smiling conditions. On smiling condition Class III group showed more upwards and lateral movement of the mouth corners than Class II group. Conclusion: Orthodontic treatment induced larger amount in movement of lips at smiling in both Class II and III patients, which may reflect the emotional changes in the patients after treatment. DOI: http://dx.doi.org/10.3329/bjodfo.v1i1.15971 Ban J Orthod & Dentofac Orthop, October 2010; Vol-1, No.1, 5-12

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