Association between 3-dimensional mandibular morphology and condylar movement in subjects with mandibular asymmetry

2017 ◽  
Vol 151 (2) ◽  
pp. 324-334 ◽  
Author(s):  
Michiyo Ikeda ◽  
Jun J. Miyamoto ◽  
Jun-ichi Takada ◽  
Keiji Moriyama
Keyword(s):  
3 Dimensional ◽  
Mandibular Asymmetry ◽  
Mandibular Morphology ◽  
Condylar Movement

scholarly journals Automated Real-Time Evaluation of Condylar Movement in Relation to Three-Dimensional Craniofacial and Temporomandibular Morphometry in Patients with Facial Asymmetry

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2591
Author(s):  
Won-June Lee ◽  
Ki-Ho Park ◽  
Yoon-Goo Kang ◽  
Su-Jung Kim
Keyword(s):  
Factor Analysis ◽  
Real Time ◽  
Tracking System ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Craniofacial Morphology ◽  
Functional Movement ◽  
Mandibular Asymmetry ◽  
System A ◽  
Condylar Movement

The aim of this study was to investigate the correlation between craniofacial morphology, temporomandibular joint (TMJ) characteristics, and condylar functional movement in patients with facial asymmetry using an up-to-date automated real-time jaw-tracking system. A total of 30 patients with mandibular asymmetry and prognathism were included. Three-dimensional (3D) craniofacial and TMJ morphometric variables were analyzed in images captured using cone-beam computed tomography. Three-dimensional condylar movements were recorded during the opening, protrusion, and laterotrusion of the jaw and divided into those for deviated and non-deviated sides. Overall functional and morphometric variables were compared between the sides by a paired t-test. Pearson’s correlation analysis and factor analysis were also performed. As a result, significant differences were found between the sides in morphometric and functional variables. The condylar path length was significantly longer and steeper on the deviated side during protrusion and lateral excursion. TMJ morphometric asymmetry, more so than the craniofacial morphologic asymmetry, seemed to be reflected in the functional asymmetry, representing different correlations between the sides, as supported by factor analysis. This study provides evidence explaining why the asymmetric condylar path remained unchanged even after orthognathic surgery for the correction of craniofacial asymmetry.

scholarly journals “Orthognathic Surgery to Improve the Facial Profile: Technique, 3D Planning and Assessment”

2020 ◽  
Author(s):  
Kitae E Park ◽  
Seija Maniskas ◽  
Omar Allam ◽  
Navid Pourtaheri ◽  
Derek M Steinbacher
Keyword(s):  
Orthognathic Surgery ◽  
Skeletal Maturity ◽  
Fat Grafting ◽  
Open Bite ◽  
Class Iii ◽  
Maxillary Hypoplasia ◽  
Delayed Treatment ◽  
3 Dimensional ◽  
Mandibular Asymmetry ◽  
Facial Harmony

Abstract A concave profile with class III malocclusion is most often due to a combination of maxillary hypoplasia and mandibular hyperplasia. Surgical correction entails normalization of jaw positions and is more challenging in the setting of concurrent asymmetry and open bite. Treatment should optimize both facial harmony and occlusion. Orthognathic surgery for class III deformities occurs at skeletal maturity and should address all aspects of the condition while preventing unnecessary emotional stress from delayed treatment. In this article, the authors describe the 3-jaw orthognathic surgery technique to address maxillary hypoplasia, mandibular prognathism, open bite and mandibular asymmetry in a single procedure. The process of preoperative 3-dimensional virtual surgical planning, detailed surgical technique, fat grafting, and a comparison of pre and postoperative 3D aesthetic outcome is presented. Additionally, a retrospective review of postoperative outcomes of 54 patients who received 3-jaw orthognathic surgery is presented as well.

3-Dimensional CBCT analysis of mandibular asymmetry in unilateral condylar hyperplasia

2016 ◽  
Vol 44 (12) ◽  
pp. 1970-1976 ◽  
Author(s):  
Jitske Willemijn Nolte ◽  
Tim Jan Verhoeven ◽  
Ruud Schreurs ◽  
Stefaan Jozef Bergé ◽  
Luc Hendrikus Elisabeth Karssemakers ◽  
...  
Keyword(s):  
3 Dimensional ◽  
Mandibular Asymmetry ◽  
Condylar Hyperplasia ◽  
Cbct Analysis

Multidisciplinary Rehabilitation of an Adult with a Cleft Lip and Palate: An Illustration of a Dental Substitution Approach for the Management of Unilateral Agenesis of Central and Lateral Incisors

FACE ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 30-38
Author(s):  
Rany M. Bous ◽  
Anand Kumar ◽  
Manish Valiathan
Keyword(s):  
Case Report ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Treatment Time ◽  
3 Dimensional ◽  
Mandibular Asymmetry ◽  
Total Treatment Time ◽  
Patient Reported ◽  
Total Treatment ◽  
Congenitally Missing

Cleft lip and Palate (CLP) is the most common craniofacial condition. Management of patients with clefts often requires multi-disciplinary rehabilitation of the orofacial structures. This case report demonstrates the multi-disciplinary management of an adult with a cleft lip and palate, highlighting the benefits of 3-Dimensional (3D) diagnosis, treatment planning and clinical execution of the plan. The patient presented with a severe maxillary deficiency, mandibular asymmetry, and congenitally missing maxillary right central and lateral incisors. This case report demonstrates an alternative approach for the management of cases with ipsilateral missing central and lateral incisors. The maxillary right canine substituted the congenitally missing maxillary right central incisor, while the maxillary right first premolar substituted the congenitally missing right lateral incisor, eliminating the need for prosthetic replacements. Total treatment time was 19 months, and the burden of care for the patient was minimized. An acceptable occlusion was achieved, and the patient’s esthetics improved significantly at the end of treatment. More importantly, the patient reported a marked improvement in his quality of life.

Three-Dimensional Reconstruction Using Stereo Pairs from Serial Thick Sections

1977 ◽  
Vol 35 ◽  
pp. 562-563
Author(s):  
Robert Glaeser ◽  
Thomas Bauer ◽  
David Grano
Keyword(s):  
Three Dimensional ◽  
Dimensional Structure ◽  
Serial Sections ◽  
Thin Sections ◽  
3 Dimensional ◽  
Transmission Electron ◽  
Freeze Dried ◽  
Dimensional Reconstruction ◽  
Stereo Imagery ◽  
Whole Mounts

In transmission electron microscopy, the 3-dimensional structure of an object is usually obtained in one of two ways. For objects which can be included in one specimen, as for example with elements included in freeze- dried whole mounts and examined with a high voltage microscope, stereo pairs can be obtained which exhibit the 3-D structure of the element. For objects which can not be included in one specimen, the 3-D shape is obtained by reconstruction from serial sections. However, without stereo imagery, only detail which remains constant within the thickness of the section can be used in the reconstruction; consequently, the choice is between a low resolution reconstruction using a few thick sections and a better resolution reconstruction using many thin sections, generally a tedious chore. This paper describes an approach to 3-D reconstruction which uses stereo images of serial thick sections to reconstruct an object including detail which changes within the depth of an individual thick section.

Structural preservation and absolute contrast of catalase crystal sections prepared with tannic acid

1983 ◽  
Vol 41 ◽  
pp. 448-449
Author(s):  
C.W. Akey ◽  
M. Szalay ◽  
S.J. Edelstein
Keyword(s):  
Tannic Acid ◽  
Beef Heart ◽  
X Rays ◽  
Screw Axis ◽  
General Applicability ◽  
Thin Sections ◽  
Beef Liver ◽  
3 Dimensional ◽  
Dimensional Reconstruction ◽  
Structural Preservation

Three methods of obtaining 20 Å resolution in sectioned protein crystals have recently been described. They include tannic acid fixation, low temperature embedding and grid sectioning. To be useful for 3-dimensional reconstruction thin sections must possess suitable resolution, structural fidelity and a known contrast. Tannic acid fixation appears to satisfy the above criteria based on studies of crystals of Pseudomonas cytochrome oxidase, orthorhombic beef liver catalase and beef heart F1-ATPase. In order to develop methods with general applicability, we have concentrated our efforts on a trigonal modification of catalase which routinely demonstrated a resolution of 40 Å. The catalase system is particularly useful since a comparison with the structure recently solved with x-rays will permit evaluation of the accuracy of 3-D reconstructions of sectioned crystals.Initially, we re-evaluated the packing of trigonal catalase crystals studied by Longley. Images of the (001) plane are of particular interest since they give a projection down the 31-screw axis in space group P3121. Images obtained by the method of Longley or by tannic acid fixation are negatively contrasted since control experiments with orthorhombic catalase plates yield negatively stained specimens with conditions used for the larger trigonal crystals.

Deviations from Ideal Decagonal Symmetry in Electron Diffraction Patterns of the “Decagonal” Phase in the Al-Co-Cu Alloy System

1991 ◽  
Vol 49 ◽  
pp. 914-915
Author(s):  
Atul S. Ramani ◽  
Earle R. Ryba ◽  
Paul R. Howell
Keyword(s):  
Electron Microscope ◽  
Alloy System ◽  
Nominal Composition ◽  
Dimensional Lattice ◽  
3 Dimensional ◽  
Decagonal Phase ◽  
Cu Alloy ◽  
Transmission Electron ◽  
Lattice Periodicity ◽  
Diffraction Patterns

The “decagonal” phase in the Al-Co-Cu system of nominal composition Al65CO15Cu20 first discovered by He et al. is especially suitable as a topic of investigation since it has been claimed that it is thermodynamically stable and is reported to be periodic in the dimension perpendicular to the plane of quasiperiodic 10-fold symmetry. It can thus be expected that it is an important link between fully periodic and fully quasiperiodic phases. In the present paper, we report important findings of our transmission electron microscope (TEM) study that concern deviations from ideal decagonal symmetry of selected area diffraction patterns (SADPs) obtained from several “decagonal” phase crystals and also observation of a lattice of main reflections on the 10-fold and 2-fold SADPs that implies complete 3-dimensional lattice periodicity and the fundamentally incommensurate nature of the “decagonal” phase. We also present diffraction evidence for a new transition phase that can be classified as being one-dimensionally quasiperiodic if the lattice of main reflections is ignored.

A Novel Reconstitution Method for Inducing the Formation of Regular 2-Dimensional Arrays of Membrane Proteins and Lipids

1988 ◽  
Vol 46 ◽  
pp. 152-153 ◽  
Author(s):  
A. Engel ◽  
A. Holzenburg ◽  
K. Stauffer ◽  
J. Rosenbusch ◽  
U. Aebi
Keyword(s):  
Membrane Proteins ◽  
Flow Rate ◽  
Lipid Membranes ◽  
Functional Characterization ◽  
Dimensional Structure ◽  
Electron Crystallography ◽  
Peltier Element ◽  
Protein Ratio ◽  
Precise Control ◽  
3 Dimensional

Reconstitution of solubilized and purified membrane proteins in the presence of phospholipids into vesicles allows their functions to be studied by simple bulk measurements (e.g. diffusion of differently sized solutes) or by conductance measurements after transformation into planar membranes. On the other hand, reconstitution into regular protein-lipid arrays, usually forming at a specific lipid-to-protein ratio, provides the basis for determining the 3-dimensional structure of membrane proteins employing the tools of electron crystallography.To refine reconstitution conditions for reproducibly inducing formation of large and highly ordered protein-lipid membranes that are suitable for both electron crystallography and patch clamping experiments aimed at their functional characterization, we built a flow-dialysis device that allows precise control of temperature and flow-rate (Fig. 1). The flow rate is generated by a peristaltic pump and can be adjusted from 1 to 500 ml/h. The dialysis buffer is brought to a preselected temperature during its travel through a meandering path before it enters the dialysis reservoir. A Z-80 based computer controls a Peltier element allowing the temperature profile to be programmed as function of time.

Structure and Interaction of Protamine by Dark Field Electron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 160-161
Author(s):  
D.P. Bazett-Jones ◽  
F.P. Ottensmeyer
Keyword(s):  
Electron Microscopy ◽  
Dark Field ◽  
Amino Acid Sequences ◽  
Dimensional Structure ◽  
3 Dimensional ◽  
Field Electron ◽  
Proposed Model ◽  
Field Electron Microscopy ◽  
Dark Field Electron ◽  
Positively Charged

It has been shown for some time that it is possible to obtain images of small unstained proteins, with a resolution of approximately 5Å using dark field electron microscopy (1,2). Applying this technique, we have observed a uniformity in size and shape of the 2-dimensional images of pure specimens of fish protamines (salmon, herring (clupeine, Y-l) and rainbow trout (Salmo irideus)). On the basis of these images, a model for the 3-dimensional structure of the fish protamines has been proposed (2).The known amino acid sequences of fish protamines show stretches of positively charged arginines, separated by regions of neutral amino acids (3). The proposed model for protamine structure (2) consists of an irregular, right-handed helix with the segments of adjacent arginines forming the loops of the coil.

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