Mild Curvature Research Articles

Assessment of Refractive Errors, Dental Caries, and Scoliosis in School Children Aged 6-14 Years: A Study in Durrës Schools

This study aims to assess the prevalence of refractive errors, dental caries, and scoliosis in children aged 6-14 years across several primary and secondary schools in the city of Durrës. The sample includes 370 students from "Vincenc Prendushi", "Nënë Tereza", "Vasil Ziu", "Abedin Dino", and "Bajram Curri" schools. Each school was selected randomly. From each school we have selected different classes and students for further evaluation. Each student underwent a clinical examination to evaluate vision, oral health, and postural status. Refractive errors were assessed using Snellen chart table placed in 6 meters. Dental caries was evaluated through clinical inspection of the teeth, using the DMFT index (Decayed, Missing, and Filled Teeth). Scoliosis was diagnosed through physical examination and the Adams forward bend test, done in physiotherapy lab of Aleksander Moisiu University. The results provide insight into the risk factors and the need for early interventions to improve the overall health of children in this age group. Out of the 370 students, 28% (104 students) were found to have refractive errors, with myopia being the most common condition, affecting 17% (63 students), followed by hyperopia in 9% (33 students), and astigmatism in 2% (8 students). A total of 42% (155 students) exhibited signs of dental caries, with an average DMFT score of 2.8, indicating a moderate level of oral health concerns. Additionally, 12% (45 students) were diagnosed with scoliosis, with mild curvature observed in 8% (30 students) and moderate to severe curvature in 4% (15 students). These findings suggest a significant need for vision correction, oral health education, and orthopedic monitoring in the student population. Early detection and preventive measures in schools are crucial to addressing these health issues effectively and ensuring the well-being of children during their developmental years.

Anatomie de la région frontale

The forehead is an anatomic region located between the frontal hairline cranially, the eyebrow and the glabella caudally, and the anterior border of the temporal fossa laterally on both sides. Its vertical situation, due to the telencephalon growth, is specific of the human species. From surface to deep planes, the skin and sub-cutaneous fat pads are described first. The muscular plane is constituted of the frontal muscles elevators of the forehead and the eyebrow, and the depressors which are the procerus and orbicularis oculi muscles superficially, the depressor supercilii muscle, and the corrugator supercilii in a deep plane. The galea aponeurotica, located deep to the frontal muscles, is a fibrous lamina on which the muscles of the skull insert. There is a sexual dimorphism of the frontal bone. The male forehead has extensive supraorbital bossing, and above this there is often a flat area, in teh femalethe supraorbital bossing is often nonexistent and above, there is a continous mild curvature. Blood supply to the forehead is given by an anterior pedicle constituted by the supraorbital and supratrochlear vessels and a lateral pedicle made of the anterior branches from the superficial temporal vessels. The sensory innervation of the forehead is given by the ophtalmic nerve which divides in frontal, nasociliar and lacrymal nerves. The motor innervation is given by the temporal ramus of the facial nerve which passes laterally to the zygomatic arch, and gives the innervation of the frontal, corrugator supercilii and procerus muscles.

Segmental deformity markers offer novel indicators of deformity progression risk in deformity-matched adolescent idiopathic scoliosis patients.

Identification of adolescent idiopathic scoliosis (AIS) patients with mild curvatures who pose significant risk of progressing to severe levels of curvatures is of paramount importance for clinical care. This study aimed to compare segmental deformity changes in AIS sub-cohorts that are dichotomised by progression status. Thirty-six female participants with Lenke 1 AIS curves were investigated with sequential MRIs during growth. Scans were reformatted to measure orthogonal segmental parameters, including sagittal/coronal wedging angles and axial rotation angles. Participants were dichotomised by progression. Two-tailed, independent sample t-tests were used to compare sub-cohort multi-segmental and segmental deformity parameters. Measurements were compared at each scan number and variable rates of change were determined using actual time between measures. AIS progression status sub-cohorts were comparable at scan 1 for multi-segmental deformity parameters (e.g. major thoracic curve angle, rib hump, kyphosis) (P > 0.05). However, apical measures of coronal IVD wedging, axial IVD rotation and axial vertebral rotation were segmental parameters at scan 1 which were larger for participants whose AIS would later go on to clinically progress (all P < 0.05). Measures of segmental hypokyphosis were comparable between groups. As development was tracked at each subsequent scan, coronal and axial plane differences between groups increased in both magnitude and number of differences. Initial disparity and then subsequent increasing magnitude of change of axial rotation may indicate a higher propensity to clinically progress in the future. This knowledge hopes to provide useful management information for AIS care providers and prognostic education for patients alike. II.

Cone-beam computed tomographic analysis of canal convolution in mesial root of mandibular second molars and a proposed new classification.

The aim is to evaluate the anatomical characteristics of mesiolingual and mesiobuccal canals in mandibular second molars particularly in terms of its exit direction, distance of confluence from the minor constriction, and the angle of confluence. The cone-beam computed tomography images of hundred mandibular second molars were analyzed. Endodontically treated teeth and those with anatomical variations such as C-shaped canal configuration were excluded from this study. The distance of the confluence from the minor constriction, angle of confluence, and the exit direction of the mesiobuccal and the mesiolingual canals were assessed. Data were analyzed using an independent t-test. The course of the mesiobuccal and mesiolingual canals beyond the confluence was towards the center of the root. The average angle of confluence was 32.75°-35.28°. The average distance of confluence from the minor constriction was 2.19 to 2.68 mm. The mesiolingual canal was straighter whereas the mesiobuccal canal had a tortuous course. Considering the results of the present study, a new classification has been proposed for the root canal morphology of the mesial root of mandibular second molars. The variation in the morphology of mandibular second molars highlights that the mesiolingual canal presented a mild curvature through and beyond the confluence when compared to the mesiobuccal canal which exhibited a tortuous course through the confluence.

Partition Function for a Volume of Space.

We consider the quantum gravity partition function that counts the dimension of the Hilbert space of a spatial region with topology of a ball and fixed proper volume, and evaluate it in the leading order saddle point approximation. The result is the exponential of the Bekenstein-Hawking entropy associated with the area of the saddle ball boundary, and is reliable within effective field theory provided the mild curvature singularity at the ball boundary is regulated by higher curvature terms. This generalizes the classic Gibbons-Hawking computation of the de Sitter entropy for the case of positive cosmological constant and unconstrained volume, and hence exhibits the holographic nature of nonperturbative quantum gravity in generic finite volumes of space.

Root Curvature in Non-Syndromic Oral Clefts: A Case-Control Study in a Brazilian Population.

This study assesses the degree of root curvature in patients with non-syndromic cleft lip and/or palate (NSCL/P). Retrospective. Case-control study. Root curvature was assessed in lower premolars and molars in 800 panoramic radiographs: 400 from patients with cleft and 400 from healthy control individuals. Root curvature was classified according to its angulation, as well as its apical, medial, or coronal localization. The frequency of mild curvature in the NSCL/P group compared to the control group was higher in premolars especially in the left second premolar in cleft palate (OR: 6.91; 95% CI: 3.23-14.77; P < .0001). The frequency of moderate curvature in molars was significantly higher in the cleft group, with the highest risk in the right first molar in the cleft lip group (OR: 2.74; 95% CI: 1.67-4.52; P < .0001). Inclination was more frequently observed in the apical third of the root in the group with cleft, whereas for the control group, the curvature was more frequent in the medial third. In patients with cleft, the OR of curvature in the apical third was significant in premolars (left lower second premolar: Cleft lip, OR: 1.91; 95% CI: 1.04-3.52; P = .03; right lower second premolar: Cleft lip, OR: 1.91, 95% CI: 1.04-3.50; P = .03, cleft lip and palate, OR: 1.75; 95% CI: 1.12-2.73; P = .01). The results of the current study indicate differences in root curvature in patients with non-syndromic cleft lip and/or palate, which should be considered during the dental treatment planning of patients.

Effects of meander curvature in thermally stratified turbulent open-channel flow

Thermal stratification can lead to the damping of turbulence, which reduces the mixing of solutes in a fluid body. A series of direct numerical simulation (DNS) solutions sweeping through a range of four different meandering channel curvatures, from a sharp to mild curvature range, are obtained to investigate the effect of curvature on stratification in meandering thermally stratified turbulent open channel flow with an internal heat source that models radiative heating from above. Based on the DNS results, the present paper addresses two issues. First, the influence of changing curvature on the complex bi-cellular pattern of the secondary flow is investigated, including the distribution of the temperature field. Second, the effects of changing curvature on the degree of stratification are analyzed. Stratification can be characterized by the friction Richardson number Riτ and the bulk Richardson number Rib. Stratification can also be viewed in terms of the transfer of energy from mean flow kinetic energy to potential energy via buoyancy fluxes. We study the effect of curvature on stratification by investigating its effect on the friction and bulk Richardson numbers. We also study the transfers between the global potential and kinetic energy reservoirs, including the global available Ea, background Eb, and total potential energy Ep, and the domain-averaged mean kinetic and turbulent kinetic energy. It is found that, in meandering channels, with the increase in curvature, Ep increases and Riτ and Rib decrease, indicating that increasing curvature leads to a decrease in the level of stratification. On the other hand, we also find that a low curvature meandering channel has a higher level of stratification than a straight channel.

Bent pinkies: Quantifying fifth finger clinodactyly in a sample of U.S. adults.

Mild curvature of the fifth finger (or clinodactyly) is a relatively common trait. While severe forms can cause functional impairment and are a feature of certain congenital syndromes, mild clinodactyly is considered a minor morphological variant. Despite exhibiting continuous variation, clinodactyly is rarely treated as a quantitative trait. Consequently, the degree of fifth finger curvature in the general population and the factors that impact this curvature are not well understood. In the present study, we measured fifth finger curvature in a sample of 1,295 U.S. adults and investigated the role of sex, age and body size. We found that clinodactyly exhibited a non-normal distribution. All participants displayed some degree of curvature, but it tended to be slight with an overall mean of 3.68 degrees (median: 3.58 degrees). In only 0.8% of cases did the curvature exceed the nominal 10-degree threshold for clinically meaningful clinodactyly. We did not find statically significant sex differences. Further, there was no meaningful relationship with height and only a weak positive relationship with age. We found that clinodactyly showed asymmetry; the curvature was greater on the left than on the right fifth finger (p < 2.2e-16), but this was not influenced by sex, age, or height. These results suggest the possibility that the kind of ubiquitous mild clinodactyly observed in the general population may be etiologically distinct from more rare and severe forms of the condition.

MP08-07 LONG TERM CONSEQUENCES OF FAILURE TO REPAIR CORPUS SPONGIOSUM IN DISTAL HYPOSPADIAS

You have accessJournal of UrologyCME1 May 2022MP08-07 LONG TERM CONSEQUENCES OF FAILURE TO REPAIR CORPUS SPONGIOSUM IN DISTAL HYPOSPADIAS David Ali, and Moneer Hanna David AliDavid Ali More articles by this author , and Moneer HannaMoneer Hanna More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002530.07AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Several surgical techniques have been described in the repair of hypospadias; however, none mention the role of repairing the corpus spongiosum. Herein we review our experience with adolescents who underwent hypospadias repair during childhood and their main complaints were partially or totally related to spongiosum defects. Their surgical outcomes are also discussed. METHODS: Between 2007 and 2017, 26 patients aged between 13 and 28 years of age (median 19 years) were operated upon to repair of the deficiency or absence of corpus spongiosum. The primary hypospadias repairs included meatal advancement and glanduloplasty (MAGPI) repair (N=10); tubularized incised plate (TIP) (N=9), and in 7 patients the primary repair was unknown. RESULTS: The main complaints were urinary infections (N=5), spraying of the urinary stream and dripping of urine (N=10) and distal urethral swelling during voiding (N=15). In 5 patients, the urethral wall was thin and covered with adherent epidermis only. In 14 patients, the laterally displaced spongiosum pillars were mobilized and approximated using interrupted log lasting absorbable sutures. Four patients had significant spongiosum deficiency and urethral swelling during urination resulting in mild diverticulum formation. In 2 patients the spongiosum pillars were fixed and could not be mobilized to provide a tension-free closure, a thick Dartos scrotal flap was used to cover the plicated urethral wall. 12 out of 25 patients underwent glandular contouring and/or meatoplasty simultaneously to improve the penile esthetics. The median follow-up period was 4 years. 6 patients were excluded from this series due to no follow-up. 18 out of 19 patients reported normal and steady urinary stream, absence of urethral swelling during voiding and no postvoid dripping. One patient developed glans dehiscence and is voiding through a coronal meatus; he declined further surgery. None developed urinary infection. The mild curvature was corrected successfully in all 4 patients. CONCLUSIONS: Failure to recognize and/or repair the corpus spongiosum defect during childhood distal hypospadias repair may become symptomatic during adolescence however, the abnormality can be corrected successfully. Source of Funding: No source of funding was provided for this study © 2022 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 207Issue Supplement 5May 2022Page: e127 Advertisement Copyright & Permissions© 2022 by American Urological Association Education and Research, Inc.MetricsAuthor Information David Ali More articles by this author Moneer Hanna More articles by this author Expand All Advertisement PDF DownloadLoading ...

Adverse-pressure-gradient turbulent boundary layer on convex wall

Direct numerical simulations (DNSs) of an incompressible turbulent boundary layer on an airfoil (suction side) and that on a flat plate are compared to characterize the non-equilibrium turbulence and the effect of wall curvature on the flow. The two simulations effectively impose matching streamwise distributions of adverse pressure gradient (APG) quantified by the acceleration parameter (K). For the airfoil flow, an existing compressible DNS carried out by Wu et al. [“Effects of pressure gradient on the evolution of velocity-gradient tensor invariant dynamics on a controlled-diffusion aerofoil at Rec = 150,000,” J. Fluid Mech. 868, 584–610 (2019)] of the flow around a controlled-diffusion airfoil is used. For the flat-plate flow, a separate simulation is carried out with the aim to reproduce the flow in the region of the airfoil boundary layer with zero to adverse pressure gradients. Comparison between the two cases extracts the effect of a mild convex wall curvature on velocity and wall-pressure statistics in the presence of APG. In the majority part of the boundary layer development, curvature effect on the flow is masked by that of the APG, except for the region with weak pressure gradients or a thick boundary layer where the effect of wall curvature appears to interact with that of APG. High-frequency wall-pressure fluctuations are also augmented by the wall curvature. Overall, the boundary layers are qualitatively similar with and without the wall curvature. This indicates that a flat-plate boundary layer DNS may serve as a low-cost surrogate of a boundary layer over the airfoil or other objects with mild curvatures to capture important flow features to aid modeling efforts.

Influence of anatomical features in the endodontic treatment planning of maxillary anterior teeth.

This study evaluate the maxillary anterior teeth anatomy by micro-computed tomography (μCT), about relevant characteristic for endodontic treatment planning. Fifty maxillary central incisors (MCI), lateral incisors (MLI) and maxillary canines (MC) were scanned using a μCT device. Two and three-dimensional parameters at 1 to 5mm distance to the apical foramen, external anatomic characteristics of the teeth and qualitative analysis of the internal anatomy was performed. The roundness and form factor values revealed a circular canal in the apical third in the MCI and MC, whereas MLI showed flattening in the apical third. The linear regression test indicated a progressive increase in the major/minor diameters in the five mm assessed (p < 0.001). The 3D analysis revealed the greatest volume and surface area in MC. The SMI showed a cylindrical geometry of root canals. All teeth presented Vertucci's type I root canal configuration. A mild curvature was prevalent in the MCI (45%) and a moderate one in the MLI (50%) and MC (50%). Palatal shoulder volume was smaller in the MLI (11.46 ± 3.09) than in the MCI (14.15 ± 3.85) and MC (13.95 ± 2.55). The most common exit of main apical foramen was in a central (22%), distolingual (30%) and mesiobuccal position (28%) for MCI, MLI and MC, respectively. Radicular grooves were observed in 2% of MCI and 4% of MLI. Two and three-dimensional data obtained by μCT allowed to observe morphological characteristics of internal/external anatomy of the maxillary anterior teeth. These characteristics may affect the endodontic treatment planning.

Possibility of Bypassing Three Fractured Rotary NiTi Files and Its Correlation with the Degree of Root Canal Curvature and Location of the Fractured File: An In Vitro Study.

This study aimed to evaluate the success rate of bypassing three NiTi rotary files (RaCe®, Hero 642®, and K3®), fractured in various root canal locations of extracted mandibular molars with two different canal curvatures. Ninety freshly extracted human first or second mandibular molars were selected. Three millimeters of the file tip (RaCe®, Hero 642®, and K3®), was fractured intentionally in the mesiobuccal root canal of each tooth by weakening the file in the last 3 mm of files #30 with 4% taper and preparing the root canals with two different degrees of curvature (n=30). Then, bypass possibility of the fractured files was evaluated using #8, #10, and #15 K-files and compared in different groups. In addition, the rate of accidental procedural errors was compared between these groups. Data were analyzed with univariate analysis and logistic regression models at a significance level of 0.05. The overall success rate of bypassing was 61.1%. RaCe® files had the highest and the K3® files had the lowest bypass possibility rates (P=0.01); the greater the degree of canal curvature, the less successful the bypass procedure (P=0.01). The fracture of the files used to bypass was the most prevalent error. Based on this in vitro study the type of fractured file and the amount of canal curvature affected the success rate of the bypassing technique. In RaCe® files and the mild curvature group, the success rate was the highest.

Application of deep learning upon spinal radiographs to predict progression in adolescent idiopathic scoliosis at first clinic visit.

BackgroundPrediction of curve progression risk in adolescent idiopathic scoliosis (AIS) remains elusive. Prior studies have revealed the potential for three-dimensional (3D) morphological parameters to prognosticate progression, but these require specialized biplanar imaging equipment and labor-intensive software reconstruction. This study aimed to formulate a deep learning model with standing posteroanterior (PA) X-rays at first clinic visit to differentiate between progressive (P) and non-progressive (NP) curves.MethodsFor this retrospective cohort study, we identified patients presenting with AIS between October 2015 to April 2020 at our tertiary referral centre. Patients with mild curvatures (11 – 30o) who were skeletally immature (Risser sign of ≤2) were recruited. Patients receiving biplanar X-ray radiographs (EOS™) were divided between a training-cross-validation cohort (328 patients) and independent testing cohort (110 patients). Another 52 patients receiving standard PA spinal X-rays were recruited for cross-platform validation. Following 3D reconstruction, we designated the major curve apex upon PA X-rays as the region of interest (ROI) for machine learning. A self-attentive capsule network was constructed to differentiate between curves manifesting P and NP trajectories. A two-stage transfer learning strategy was introduced to pre-train and fine-tune the model. Model performance (accuracy, sensitivity, specificity) was compared to that of traditional convolutional neural networks (CNNs) and a clinical parameter-based logistic regression model.Findings3D reconstruction identified that apical rotation of the major curve and torsion were significantly different between P and NP curve trajectories. Our predictive model utilizing an ROI centered on the major curve apex achieved an accuracy of 76.6%, a sensitivity of 75.2% and a specificity of 80.2% upon independent testing. Cross-platform performance upon standard standing PA X-rays yielded an accuracy of 77.1%, a sensitivity of 73.5% and a specificity of 81.0%. Errors in prediction occurred when the degree of apical rotation / torsion was discrepant from that of the subsequent curve trajectory but could be rectified by considering serial X-rays. Performance was superior to that of traditional CNNs as well as clinical parameter-based regression models.InterpretationThis is the first report of automated prediction of AIS curve progression based on radiomics and deep learning, towards directing treatment strategy at first visit. Patients predicted to be at-risk of progression may be counselled to receive early bracing with enforcement of treatment compliance. Over-treatment may be avoided in curves deemed to be non-progressive. Results need to be consolidated in larger sample populations of different ethnicities.FundingThe Society for the Relief of Disabled Children (SRDC).

A case-control study on physical activity of teenagers with adolescent idiopathic scoliosis

Abstract Background Adolescent idiopathic scoliosis affects 2-3% of all teenagers. It is one of the most common chronic conditions in this age group, but studies on the physical activity (PA) of AIS patients are scarce. The available trials report conflicting findings when comparing the PA of children with AIS to healthy controls. Considering its possible role in the development of AIS and the potential benefits of PA, the topic should be further researched. This study aims to investigate the subject by comparing the physical activity of children with AIS to a group of healthy peers. Methods The study included 80 teenagers (aged 11-18 years) with AIS and 65 healthy age and gender-matched controls from Varna, Bulgaria. Data was collected after receiving informed consent from the parents. Children with chronic conditions (except AIS) were excluded. Information on AIS was taken from the available medical documentation. Data on PA during the last 7 days was collected via a standardized physical activity questionnaire for adolescents (PAQ-A). PAQ-A results vary from 1 (lowest PA) to 5 (highest PA). PAQ-A=2.75 has been found to correspond to the minimum recommended by WHO for this age group - 60mins of daily moderate to vigorous PA. Results None of the participants with AIS reported reduced PA due to impaired or restricted physical functions. The majority of children (78.8%) had mild scoliotic curvatures (Cobb angle 10°-20°). The mean PAQ-A score in AIS cases was 2.59 compared to 2.88 in controls. There was a statistically significant difference in PAQ-A score between the two groups (t = 2.722, p &amp;lt; 0.001). 59% of AIS had a PAQ-A score under 2.75, indicating that they do not meet the minimum PA recommendation by WHO, compared to 31% of the control group. Conclusions Patients with AIS have significantly lower PA than their healthy peers. The majority of children with AIS do not meet the minimum PA recommendations by the WHO. Key messages Our study reveals that children with AIS and mild curvatures have lower PA than their healthy peers despite not reporting impaired or restricted physical functions. Future prospective studies should investigate whether PA plays a role in the etiology of AIS.

Fluid Pressure Diffusion in Fractured Media: The Role Played by the Geometry of Real Fractures

AbstractWave‐induced fluid pressure diffusion (FPD) represents an important mechanism of seismic energy dissipation in fractured media. The associated effects on wave propagation are typically studied considering idealized fracture geometries. Here, we study fracture‐geometry‐related effects on FPD by numerically computing the frequency‐dependent and angle‐dependent seismic velocity and attenuation on models having fractures of realistic geometries. The geometry of the models is derived from microcomputed tomography images of a fractured Berea sandstone. By comparing the numerical results with those for an equivalent thin‐planar‐layer analytical model, we isolate fracture‐geometry effects. We found that discrepancies on the anisotropic behavior of P and S waves with respect to the simple analytical model are small except for the S wave attenuation. This is associated with the pressure gradients induced by S waves in fractures exhibiting a mild curvature. Part of this dissipation occurs inside the fracture, parallel to its walls, and is thus controlled by its permeability, which points to a possible perspective of inferring fracture hydraulic properties from S waves attenuation.

Symptomatic corpus spongiosum defect in adolescents and young adults who underwent distal hypospadias repair during childhood

Several popular surgical techniques have been described for the repair of distal hypospadias; however, the role of repairing the corpus spongiosum was rarely discussed. Herein we review our experience with adolescents who underwent hypospadias repair during childhood. Their main complaints were partially or totally related to spongiosum deficiency, the surgical outcomes are also discussed. Between 2007 and 2018, 25 patients aged between 13 and 28 years of age (median 19 years) were operated upon to repair the deficiency or absence of corpus spongiosum in addition to a Thiersch-Duplay urethroplasty. Their records indicated that the primary hypospadias repairs during childhood included MAGPI (N=10) and TIPU (N=9), in 6 patients the repair of the distal hypospadias was unknown. The main complaints were; abnormal urinary stream which patients described as spraying and/or dripping of urine (N=10) and distal urethral swelling during voiding and dripping of urine post voiding (N=15). Eight patients reported that they were treated for symptomatic recurrent urinary tract infections by their primary physicians. In 5 patients, the urethral wall was thin and covered with adherent epidermis only. In 20 patients, the laterally displaced spongiosum pillars were well-defined, 4 of whom exhibited mild chordee. In 14 patients the spongiosum pillars were mobilized and approximated using interrupted absorbable sutures. Four patients had spongiosum deficiency and urethral swelling resulting in mild diverticulum formation. The urethral wall was plicated and covered with the spongiosum and/or dartos flaps. In 4 patients the spongiosum pillars were fixed and could not be mobilized to provide a tension-free closure. In these cases, a dartos flap harvested from the scrotum, and used to cover the urethral wall and was sutured on either side to the spongiosum pillars. 12/25 patients underwent glandular contouring and/or meatoplasty simultaneously to improve the penile esthetics. The follow-up period varied between 18 months and 7 years (mean 3.5 years). 24/25 patients reported a normal steady urinary stream, absence of urethral swelling during voiding and none (22) or minimal (2) postvoid droplets of urine which soiled the underwear. One patient developed glans dehiscence and is voiding through a coronal meatus; he declined further surgery. None developed symptomatic urinary infection. The spongioplasty corrected the mild curvature in all 4 patients. Failure to recognize and/or correct the deficient corpus spongiosum during the repair of distal hypospadias during childhood may become symptomatic during adolescence however, the abnormality can be corrected successfully.

Controlling Movement at Nanoscale: Curvature Driven Mechanotaxis.

Locating and manipulating nano-sized objects to drive motion is a time and effort consuming task. Recent advances show that it is possible to generate motion without direct intervention, by embedding the source of motion in the system configuration. In this work, an alternative manner to controllably displace nano-objects without external manipulation is demonstrated, by employing spiral-shaped carbon nanotube (CNT) and graphene nanoribbon structures (GNR). The spiral shape contains smooth gradients of curvature, which lead to smooth gradients of bending energy. It is shown that these gradients as well as surface energy gradients can drive nano-oscillators. An energy analysis is also carried out by approximating the carbon nanotube to a thin rod and how torsional gradients can be used to drive motion is discussed. For the nanoribbons, the role of layer orientation is also analyzed. The results show that motion is not sustainable for commensurate orientations, in which AB stacking occurs. For incommensurate orientations, friction almost vanishes, and in this instance, the motion can continue even if the driving forces are not very high. This suggests that mild curvature gradients, which can already be found in existing nanostructures, could provide mechanical stimuli to directmotion.

Improvement of the SST γ-Reθt transition model for flows along a curved hydrofoil

The transition in the boundary-layer flow affects the hydrodynamic performances of hydraulic machineries, as the key components in the ship propulsion system. The shear stress transfer (SST) γ-Reθt transition model is an important prediction tool in the boundary layer simulation for hydrofoils. The present paper improves the prediction accuracy of the SST γ-Reθt model for the boundary layers along a curved hydrofoil. The SST γ-Reθt transition model for the flows along a curved hydrofoil is improved by introducing a correction to the transition onset Reynolds number Reθt. First, the transition onset locations for the flows along the hydrofoils of different curvatures are obtained by the large eddy simulation and by using the SST γ-Reθt model. Then, the transition onset Reynolds numbers Reθt in the SST γ-Reθt model is modified to ensure that the predicted boundary layer parameters are consistent with the large eddy simulation (LES) results. The correlation function between the curvature ratio and the modified transition onset Reynolds number is obtained and subsequently used as a correction function in the original SST γ-Reθt model. Three test cases are used to evaluate the performance of the improved SST γ-Reθt model. For the NACA0035 hydrofoil with a large curvature, the predicted results obtained by using the improved SST γ-Reθt model are quite consistent with the experimental data, which indicates the advantages of the improved model in predicting the boundary layer transition along a hydrofoil. In the test cases of the NACA0016 hydrofoil with a mild curvature and the NACA66(mod)-312 hydrofoil, the prediction results of the improved model are in good agreement with the experimental results in terms of the wake region and the boundary layer parameters, which indicates that the improved SST γ-Reθt model can serve as a powerful tool in the design and the optimization of hydraulic machineries such as the waterjet pumps or the naval propellers.

Use of Temporary Rod and Intraoperative Neuroimaging for Correction of Adolescent Idiopathic Scoliosis: 2-Dimensional Operative Video.

Adolescent idiopathic scoliosis (AIS) is an abnormal lateral curvature of the spine that arises during the pubescent growth spurt. AIS mainly affects females in the age group of 10 to 16 yr, with a prevalence of about 1% to 3% in the at-risk population.1 Treatment options vary depending on disease presentation and severity. Mild curvature mainly requires periodic observation for disease progression, whereas more moderate curvature can necessitate bracing or corrective surgery.2 Here, we present the use of a temporary rod and neuroimaging for the correction of Lenke type 1 spinal curvature in an AIS patient. An inferior facetectomy is performed, and a Lenke probe is used for entry into the pedicle and vertebral body. The channel is sounded before and after tapping to check for adequate walls prior to insertion of the pedicle screw. The ARTIS pheno is brought into the field, which uses fluoroscopy to create a 3-dimensional (3D) representation of the instrumentation within the spine. A temporary rod is placed in the concavity, and a combination of corrective techniques, including a rod roll, apical translation, and reduction, is performed to bring up the concavity, derotate the spine, and translate the spine. The permanent rod is then placed in the convexity, and compression is performed to bring down the scapular prominence. The temporary rod is then removed, and a final rod is placed to complete the 3D correction. The patient consented to the procedure, and an informed written consent was obtained from the patient to use her photographs and video recordings for publication.

The assesment of pattern of maxillary canine impaction in the Ardabil city

Background &amp; Objective: Impacted teeth are one of the most common reasons for visit- ing dentists and maxillofacial surgeons. During clinical and radiographic examinations and evalu- ations, the dentist sometimes realizes that the patient’s problem is due to the impaction of one or more teeth. Therefore, it is necessary for every dentist to make the necessary and correct decision for the treatment of such teeth. One of the best ways to diagnose impacted teeth is first of all the absence of that tooth in the desired location and clinical evaluation of the patient and secondly to check the radiographic view of the desired area. Impacted teeth can be the source of many prob- lems for various reasons, so in most cases, their extraction is recommended. Knowing how to place the impacted tooth and determining its type and other characteristics of the impaction can help the dentist in choosing the appropriate treatment-surgical method and also prevent complications during surgery. Proper and timely diagnosis of impaction as well as determining its position (buc- cal-palatal-intermediate) in the jawbone can reduce damage to adjacent structures and also affect the treatment plan. Because accurate detection of impacted tooth positions is possible with radiog- raphy, the most accurate radiograph to examine the impacted tooth is cbct images. Therefore, due to possible occlusion injuries and the effect of occlusion pattern on the treatment of these teeth, it is important to study the types of impaction patterns. Therefore, this study was presented with the aim of investigating the impaction pattern of maxillary canine teeth in Ardabil with cbct archive. Materials and Methods: In this descriptive cross-sectional study, CBCT images of 239 patients who met the inclusion criteria were evaluated. Due to the lack of statistics, due to the lack of statistics of maxillary impacted canine teeth in Ardabil, the counting method was used for sampling and stereotypes were identified as maxillary impacted canine teeth as the sample size. The obtained data were analyzed in SPSS24 software. Results: Among the impacted canine teeth studied, 63.2% had palatal, 17.5% buccal and 19.3% had intermediate pattern. Also, 11.2% had damage to adjacent structures and 88.8% had no damage to adjacent structures. Among the types of damage to adjacent structures, 46.9% caused root re- sorption of the first premolars, 34.5% caused root canal resorption, and 18.6% had other damage to adjacent structures. Of these, 50.4% had root curvature and 49.6% had no root curvature, of which 12.1% had severe curvature, 38.7% had mild curvature and 49.2% had severe curvature. Also, the average angle of the incised canine to the lateral incisor was 41.7%. 9% of impacted canine teeth had a root resorption of lateral incisors and 9% did not have a root resorption of lateral incisors. Conclusion: Dentists should treat cases such as maxillary latent canine such as: Examine the occlusion pattern, angle to adjacent teeth, damage to adjacent structures, curvature of the incised canine root, and root resorption of adjacent teeth.