949 results match your criteria curvature cross-sectional


Decreased choroidal and scleral thicknesses in highly myopic eyes with posterior staphyloma.

Sci Rep 2021 Apr 12;11(1):7987. Epub 2021 Apr 12.

Department of Ophthalmology, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 110-799, Korea.

In this cross-sectional study, we investigated choroidal thickness (CT) and scleral thickness (ST) in highly myopic eyes and their associations with ocular factors. Patients underwent widefield swept-source optical coherence tomography (OCT) to measure the CT and ST at the subfovea and 3000 μm superior, inferior, temporal, and nasal to the fovea and macular curvature. A total of 237 eyes (154 patients) were included. Read More

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The distributions of crystalline lens tilt and decentration and associated factors in age related-cataract.

J Cataract Refract Surg 2021 Mar 5. Epub 2021 Mar 5.

State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, Guangdong, China.

Purpose: To investigate the characteristics and factors associated with crystalline lens tilt and decentration measured by Casia2 anterior segment optical coherence tomography (AS-OCT).

Setting: Zhongshan Ophthalmic Centre, Sun Yat-sen University, Guangzhou, China.

Design: This is a cross-sectional study. Read More

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Micro-computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments.

Int Endod J 2021 Mar 24. Epub 2021 Mar 24.

Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School.

Aim: To compare microcrack formation in roots of extracted teeth after the shaping of straight and curved root canals with hand, rotary, and reciprocating files using micro-computed tomographic (micro-CT) analysis.

Methodology: Thirty straight mandibular incisors and 30 severely curved mesial roots of mandibular molars were randomly divided into 6 experimental groups (n = 10) according to the systems used for the root canal preparation and the root canal curvature: ProTaper Universal for Hand Use (Dentsply Sirona, Ballaigues, Switzerland), HyFlex EDM (Coltene-Whaledent, Altstätten, Switzerland), and Reciproc Blue (VDW, Munich, Germany) files used in mandibular incisors (straight canals) and mesial roots of mandibular molars (curved canals). The roots were imaged with micro-CT scanning at an isotropic resolution of 14 μm before and after root canal preparation, and the cross-sectional images generated were assessed to detect microcracks. Read More

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Multiaxial pulsatile dynamics of the thoracic aorta and impact of thoracic endovascular repair.

Eur J Radiol Open 2021 11;8:100333. Epub 2021 Mar 11.

Department of Vascular Surgery, Stanford University, 300 Pasteur Drive, Stanford, CA, 94305, USA.

Purpose: The thoracic aorta is a highly mobile organ whose dynamics are altered by thoracic endovascular aorta repair (TEVAR). The aim of this study was to quantify cardiac pulsatility-induced multi-axial deformation of the thoracic aorta before and after descending aortic TEVAR.

Methods: Eleven TEVAR patients (8 males and 3 females, age 57-89) underwent retrospective cardiac-gated CT angiography before and after TEVAR. Read More

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Macular irregularities of optical coherence tomographic vertical cross sectional images in school age children.

Sci Rep 2021 Mar 5;11(1):5284. Epub 2021 Mar 5.

Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.

The purpose of this study was to compare the incidences of macular irregularities of elementary school (ES) and junior high school (JHS) students. This was a prospective cross-sectional observational study of 122 right eyes of 122 ES students (8-9 years) and 173 right eyes of 173 JHS students (12-13 years). Vertical cross-sectional images of the macula were obtained by optical coherence tomography. Read More

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Role of the left coronary artery geometry configuration in atherosusceptibility: CFD simulations considering sPTT model for blood.

Comput Methods Biomech Biomed Engin 2021 Mar 4:1-16. Epub 2021 Mar 4.

Engineering Faculty, University of Porto, Porto, Portugal.

The achievement of clinically viable methodologies to simulate the hemodynamics in patient-specific coronary arteries is still a major challenge. Therefore, the novelty of this work is attained by the introduction of the viscoelastic property of blood in the numerical simulations, to study the role of the left coronary artery (LCA) geometry configuration in the atherosusceptibility. Apparently healthy patients were used and four different methodologies were tested. Read More

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Morphologic Features of the Distal Femur and Proximal Tibia: A Cross-Sectional Study.

Cureus 2021 Jan 25;13(1):e12907. Epub 2021 Jan 25.

Anatomy, All India Institute of Medical Sciences, Bhopal, IND.

Background The asymmetric medial and lateral condyles of the distal femur and proximal tibia have a direct influence on the biomechanics of knee joint and prostheses design. This study aimed to determine the morphologic data, that is., anteroposterior (AP) and mediolateral (ML) widths, and the radius of curvature (ROC) of the geometric arcs of the distal femur and proximal tibia. Read More

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January 2021

Influence of upper lip curvature on smile attractiveness in patients with different degrees of gingival smiles: A cross-sectional study with opinions from oral health providers and laypersons.

Am J Orthod Dentofacial Orthop 2021 Apr 7;159(4):e321-e329. Epub 2021 Feb 7.

Division of Orthodontics, School of Dentistry, Universidad Científica del Sur, Miraflores, Lima, Perú.

Introduction: Although there is relative consensus about approaches to gingival smile management, there are still discrepancies as to whether a gingival smile is attractive or not. The purpose of this study was to quantify the influence of upper lip curvature shape and the amount of gingival display on the perception of smile attractiveness assessed by Peruvian orthodontists, dentists, and laypersons.

Methods: A frontal photograph was digitally altered to generate 3 types of upper lip curvature shapes (upward, straight, and downward) with 5 different levels of gingival smile exposure (0 mm, 2 mm, 3 mm, 4 mm, and 5 mm). Read More

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Keratoconus Indices and their Determinants in Healthy Eyes of a Rural Population.

J Curr Ophthalmol 2020 Oct-Dec;32(4):343-348. Epub 2020 Dec 12.

Department of Psychiatric Nursing and Management, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Purpose: To determine the distribution of keratoconus indices in a 5-93-year-old healthy eyes of a rural population in Iran.

Methods: In this cross-sectional study, multi-stage cluster sampling was applied to select subjects from two villages in the north and southwest of Iran. After obtaining informed consent, all subjects underwent ophthalmologic and optometric examinations. Read More

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December 2020

Microcomputed tomographic evaluation of shaping ability of two thermo mechanically treated single-file systems in severely curved roots.

J Conserv Dent 2020 May-Jun;23(3):244-248. Epub 2020 Dec 4.

Department of Conservative Dentistry and Endodontics, Al-Badar Dental College and Hospital, Gulbarga, Karnataka, India.

Context: Canal shaping abilities such as canal transportation, centering ability, and preparation time are important and have to be considered before using any Nickel-Titanium file system.

Aim: This study aimed to evaluate and compare the amount of canal transportation, centering ability, and time required for the shaping of severely curved canals with WaveOne Gold (WOG) Primary Reciprocating file and One Curve (OC) Rotary file using the micro computed tomography (μCT).

Materials And Methods: Thirty intact mesial roots of extracted human mandibular first molars having severe curvature (25°-35°) were selected. Read More

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December 2020

Consistent differences in lumbar spine alignment between low back pain subgroups and genders during clinical and functional activity sitting tests.

Musculoskelet Sci Pract 2021 04 26;52:102336. Epub 2021 Jan 26.

Program in Physical Therapy, Washington University School of Medicine, St. Louis, Missouri, United States. Electronic address:

Background: Subgroups of people with low back pain display differences in their lumbar alignment during tests from a clinical examination. However, it is unknown if subgroups display the same patterns during a functional activity test and if gender influences subgroup-related differences.

Objectives: Test if differences in lumbar alignment between two LBP subgroups are 1) present during a functional activity test of preferred sitting and 2) independent of gender. Read More

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Morphological divergence in the curvature of human femoral diaphyses: Tracing the central mass distributions of cross-sections.

J Anat 2021 Feb 1. Epub 2021 Feb 1.

Department of Macroscopic Anatomy, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan.

The diaphysis of the human femoral bone has a physiological anterior curvature; additionally, there is a curvature to the medial side or lateral side. In addition to compression stress from gravity during standing, walking, and running, these bones are continuously exposed to complex stresses from the traction forces of the various strong muscles attached to them. The femoral diaphysis is subjected to these mechanical stresses, and the direction and size of its curvature are defined according to Wolff's law and the mechanostat theory of Frost. Read More

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February 2021

Morphologic measurements of 3D Eustachian tube model and their diagnostic value regarding Eustachian tube dysfunction - A cross-sectional observational study.

Eur J Radiol 2021 Mar 23;136:109563. Epub 2021 Jan 23.

Department of Diagnostic and Interventional Neuroradiology, University Hospital Tübingen, Germany. Electronic address:

Purpose: To investigate the diagnostic value of three-dimensional morphologic measurements of the Eustachian tube on computed tomography in Eustachian tube dysfunction.

Method: This prospective cross-sectional observational study includes forty patients with unilateral Eustachian tube dysfunction. The clinical diagnosis is verified using the Eustachian tube score - 7 and the Eustachian tube dysfunction questionnaire - 7. Read More

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Population-based, three-dimensional analysis of age- and sex-related femur shaft geometry differences.

Osteoporos Int 2021 Jan 26. Epub 2021 Jan 26.

Department of Orthopaedics, Asan Medical Center, Seoul, Republic of Korea.

This study deals with differences of femoral geometric focus on the bowing and width. Analysis using three-dimensional skeletonization showed increase of femoral bowing and femur width over life (more in women), and widening of the medullary canal only in women after 50 years old, not in men.

Introduction: The changes in femur geometry that occur with aging and lead to fragility or insufficiency fracture remain unclear. Read More

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January 2021

Pentacam Indices in Photorefractive Keratectomy Surgery.

J Med Life 2020 Oct-Dec;13(4):523-529

Social Determinants of Health Research Center, Ardabil University of Medical Sciences, Ardabil, Iran.

Refractive eye surgeries are one of the most non-emergent ophthalmic surgeries due to the effect on the reduction of refractive errors, increasing visual acuity, enhancing the quality of vision, and indirectly increasing the quality of life of patients. The aim of this study was to determine Pentacam indices in the patients who underwent photorefractive keratectomy (PRK) during 2014-2018, as well as to show their correlation with the type of refractive error. This descriptive cross-sectional study was performed on 2215 eyes of 1125 patients undergoing PRK surgery. Read More

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January 2021

Chest MRI to diagnose early diaphragmatic weakness in Pompe disease.

Orphanet J Rare Dis 2021 Jan 7;16(1):21. Epub 2021 Jan 7.

Center for Lysosomal and Metabolic Diseases, Department of Neurology, Erasmus MC, University Medical Center Rotterdam, Dr. Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands.

Background: In Pompe disease, an inherited metabolic muscle disorder, severe diaphragmatic weakness often occurs. Enzyme replacement treatment is relatively ineffective for respiratory function, possibly because of irreversible damage to the diaphragm early in the disease course. Mildly impaired diaphragmatic function may not be recognized by spirometry, which is commonly used to study respiratory function. Read More

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January 2021

Measuring the Ocular Morphological Parameters of Guinea Pig Eye with Edge Detection and Curve Fitting.

Comput Math Methods Med 2020 18;2020:6689023. Epub 2020 Dec 18.

Department of Ophthalmology, Shanghai Children's Hospital, Shanghai Jiaotong University, Shanghai 200062, China.

Aim: To identify the guinea pig eyeball with edge detection and curve fitting and devise a noncontact technology of measuring ocular morphological parameters of small experimental animal.

Methods: Thirty-nine eyeballs of guinea pig eyeballs were photographed to obtain the anterior and posterior surface; transverse and sagittal planes after the eyeballs were eviscerated. Next, the eyeball photos were input into digital image analysis software; the corresponding photo pixels-actual length ratio was acquired by a proportional scale. Read More

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December 2020

A New Posterior Extensor Attachment-Point Reconstruction Technique for Cervical Spondylotic Myelopathy Involving C2 Segment: Clinical Outcome and Safety.

J Neurol Surg A Cent Eur Neurosurg 2021 Mar 22;82(2):169-175. Epub 2020 Dec 22.

Department of Spine Surgery, Tianjin Hospital, Tianjin, China.

Background And Study Aim:  Cervical spondylotic myelopathy (CSM) is a common degenerative disease that mainly occurs in elder patients, leading to different degrees of neurological dysfunction. Spinal cord involvement is mainly distributed at the C3-C7 segments, but it may also involve up to the C2 level. This study aimed to assess the clinical efficacy and safety of open-door laminoplasty using a new extensor attachment-point reconstruction technique for treating CSM involving the C2 segment. Read More

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A Investigating the Outcome of Surgery in Patients with Penile Fracture.

Urol J 2020 Dec 12. Epub 2020 Dec 12.

Department of Urology, Isfahan University of Medical Sciences, Isfahan, Iran.

Purpose The aim of study was to investigate the outcome of surgery in patients with penile fracture in Al-Zahra hospital. Materials and Methods This cross sectional study was conducted on 187 patients with penile fracture underwent surgery in Al-Zahra hospital during 2016- 2020. Data such as penile fracture causes, erectile dysfunction, time of surgery after penile fracture, degree of penile curvature and etc were extracted from medical records. Read More

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December 2020

Spine system changes in soldiers after load carriage training in a plateau environment: a prediction model research.

Mil Med Res 2020 12 21;7(1):63. Epub 2020 Dec 21.

Department of Orthopaedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China.

Background: Low back pain is the most common spinal disorder among soldiers, and load carriage training (LCT) is considered the main cause. We aimed to investigate changes in the spine system of soldiers after LCT at high altitudes and the change trend of the lumbar spine and surrounding soft tissues under different load conditions.

Methods: Magnetic resonance imaging scans of the lumbar spines of nine soldiers from plateau troops were collected and processed. Read More

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December 2020

Proportion and characteristic of emmetropia in schoolchildren aged 6-11y: the Shenzhen elementary school eye study.

Int J Ophthalmol 2020 18;13(12):1983-1989. Epub 2020 Dec 18.

State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China.

Aim: To investigate the proportion and characteristic of emmetropia in schoolchildren aged 6-11, especially estimate the normal value of ocular biometric parameters of emmetropia.

Methods: A population-based cross-sectional study was conducted on children aged 6-11y in Shenzhen. Totally, 2386 schoolchildren from two primary schools were involved. Read More

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December 2020

Optimal Multifield Functional Electrical Stimulation Parameters for the "Turn on the Light" Task and Related Upper Limb Kinematics Repeatability in Poststroke Subjects.

Arch Phys Med Rehabil 2020 Nov 27. Epub 2020 Nov 27.

Center for Rehabilitation Research - Human Movement System (Re)habilitation Area, Department of Physics, School of Health, Polytechnic of Porto, Porto, Portugal.

Objective: To characterize the optimal functional electrical stimulation (FES) parameters that assist the turn on the light task (TOTL) on poststroke participants and to analyze the related upper limb (UL) kinematics repeatability.

Design: Cross-sectional study.

Setting: Human movement research center. Read More

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November 2020

A braided stent becomes flattened inside a curved catheter tube: A micro-CT imaging study.

Biomed Mater Eng 2020 ;31(6):373-380

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan.

Background: The braided stent is a widely accepted endovascular treatment device consisting of woven metal wires. One of the unsolved issues for the braided stent is the stent flattening phenomena when deployed into highly curved arteries. Although a recent computational study highlighted that the mechanical state of the stent inside the catheter before the deployment plays an essential role in causing stent flattening, there is no experimental observation for the stent inside the curved catheter. Read More

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January 2020

The Current Practice of Adult Idiopathic Scoliosis Surgical Treatment Among Spine Surgeons in Saudi Arabia.

Cureus 2020 Nov 18;12(11):e11552. Epub 2020 Nov 18.

Orthopaedics, King Abdulaziz Medical City, Ministry of National Guard Health Affairs, Riyadh, SAU.

Background: Scoliosis is a spinal deformity consisting of lateral curvature and rotation of the vertebrae. The goal of corrective scoliosis surgery is to restore alignment of the spine and maintain motion. However, there is no global agreement among spine surgeons on the best method of surgical intervention, and little is known about the variations in practice among spine surgeons in Saudi Arabia. Read More

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November 2020

The incidence of nickel-titanium endodontic hand file fractures: A 7-year retrospective study in a tertiary care hospital.

J Conserv Dent 2020 Jan-Feb;23(1):21-25. Epub 2020 Oct 10.

Department of Dentistry, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India.

Aim: The present retrospective cross-sectional study aims to evaluate the incidence and factors associated with nickel-titanium hand file fractures in root canal-treated teeth in a tertiary care hospital of western India.

Methodology: The diagnostic records of intraoral periapical (IOPA) radiographs were analyzed to check for file fractures in the root canal-treated teeth. As a part of standardized departmental protocol, Hand ProTaper Universal file system (Dentsply, India) was used for chemomechanical preparation for root canal treatment. Read More

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October 2020

Cross-Section Deformation and Bending Moment of a Steel Square Tubular Section.

Materials (Basel) 2020 Nov 16;13(22). Epub 2020 Nov 16.

Department of Materials Forming and Processing, Rzeszow University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszów, Poland.

When bending thin-walled profiles, significant distortion of the cross-section occurs, which has a significant impact on the course of the bending moment characteristics and on the value of allowable bending curvatures. This paper presents the results of experimental and numerical modeling of the box profile bending process, which was carried out in order to determine the dependence of the cross-sectional shape and bending moment of bending curvature. Extensive numerical calculations were used to model the process of shaping a square pipe from a circular tube and to model the bending process, especially when taking into account the effects of such a deformation path. Read More

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November 2020

Association between ocular biometrical parameters and diabetic retinopathy in Chinese adults with type 2 diabetes mellitus.

Acta Ophthalmol 2020 Nov 16. Epub 2020 Nov 16.

Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-Sen University, Guangzhou, China.

Purpose: The influence of myopia and ocular biometry parameters on diabetic retinopathy (DR) needs further clarification. We aimed to investigate the association between ocular biometrical parameters and DR in Chinese people with diabetes mellitus (DM) without any ocular intervention.

Methods: This cross-sectional study recruited type 2 DM patients with no history of ocular treatment in Guangzhou, China. Read More

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November 2020