Height Of Center Research Articles

Subthreshold Micropulse Laser (577 nm) Therapy with an Individual Approach for Power Titration in Patients with Chronic Central Serous Chorioretinopathy (Pilot Study)

Purpose. To study the safety and effectiveness of subthreshold micropulse (SML) 577 nm laser therapy with an individual power titration in treating patients with chronic central serous chorioretinopathy (CSC). Methods. The study was a prospective, single‐centre observation of 30 patients (30 eyes) with chronic CSC. All patients with chronic CSC were treated with a 577 nm micropulse laser. Individual power parameters for each patient were titrated in a micropulse mode. The primary outcome measure was best‐corrected visual acuity (BCVA) at 6‐month follow‐up. The secondary outcome measures were as follows: central retinal thickness (CRT) and maximum subretinal fluid height (SRFH) according to optical coherence tomography, number of laser sessions, and treatment safety at 6‐month follow‐up. Results. Before treatment, the mean BCVA was 0.35 ± 0.16, the mean CRT was 285 ± 76 µm, and the mean SRFH was 311 ± 85 µm. Six months after 577 nm SML therapy, there was a statistically significant increase in the mean BCVA with the maximum correction to 0.45 ± 0.15 (p = 0.001). The mean CRT and SRFH decreased significantly to 236 ± 45 μm (p = 0.003) and 45 ± 25 μm (p = 0.001), respectively. At the end of the follow‐up, complete resorption of the subretinal fluid was noted in 50% (15 eyes), and in 43% (13 eyes), a decrease in the SRFH was observed. During the entire observation period, 25 patients underwent 1 session of 577 nm SML therapy, 2 patients underwent 2 sessions, and 3 patients underwent the intervention three times. Conclusion. SML 577 nm therapy with individual selection of laser power in a micropulse mode is a safe and effective method of treating patients with chronic CSC. Further studies are needed to test the long‐term safety and efficacy of 577 nm SML therapy with individual power settings in chronic CSC.

Selective serotonin re-uptake inhibitors affect craniofacial structures in a mouse model.

Selective serotonin re-uptake inhibitors (SSRI) widely used in the treatment of depression, anxiety, obsessive compulsive disorder, fibromyalgia, and migraine are among the most heavily prescribed drug class in the United States (US). Along with an overall rise in SSRI use, these medications are increasingly used by pregnant individuals and recent preclinical and clinical studies have indicated that SSRIs may increase the prevalence of congenital abnormalities and birth defects of the craniofacial region. Our group has developed pre-clinical models of study, including those that mimic the clinical use of SSRI in mice. Here we designed a study to interrogate a commonly prescribed SSRI drug, Citalopram, for its effects on craniofacial and dental development when introduced in utero. Pre-natal exposure to a clinically relevant dose of citalopram resulted in changes in craniofacial form identified by an increase in endocast volume in SSRI exposed postnatal day 15 mouse pups. More specifically, cranial length and synchondrosis length increased in SSRI exposed pups as compared to control pups of the same age. Additionally, growth center (synchondrosis) height and width and palate length and width decreased in SSRI exposed pups as compared to control un-exposed pups. Effects of SSRI on the molars was minimal. Craniofacial growth and development continue to be an area of interest in the investigation of in utero pharmaceutical drug exposure. Altogether these data indicate that prenatal SSRI exposure affects craniofacial form in multiple tissues and specifically at growth sites and centers of the skull.

Forest Height Inversion by Combining Single-Baseline TanDEM-X InSAR Data with External DTM Data

Forest canopy height estimation is essential for forest management and biomass estimation. In this study, we aimed to evaluate the capacity of TanDEM-X interferometric synthetic aperture radar (InSAR) data to estimate canopy height with the assistance of an external digital terrain model (DTM). A ground-to-volume ratio estimation model was proposed so that the canopy height could be precisely estimated from the random-volume-over-ground (RVoG) model. We also refined the RVoG inversion process with the relationship between the estimated penetration depth (PD) and the phase center height (PCH). The proposed method was tested by TanDEM-X InSAR data acquired over relatively homogenous coniferous forests (Teruel test site) and coniferous as well as broadleaved forests (La Rioja test site) in Spain. Comparing the TanDEM-X-derived height with the LiDAR-derived height at plots of size 50 m × 50 m, the root-mean-square error (RMSE) was 1.71 m (R2 = 0.88) in coniferous forests of Teruel and 1.97 m (R2 = 0.90) in La Rioja. To demonstrate the advantage of the proposed method, existing methods based on ignoring ground scattering contribution, fixing extinction, and assisting with simulated spaceborne LiDAR data were compared. The impacts of penetration and terrain slope on the RVoG inversion were also evaluated. The results show that when a DTM is available, the proposed method has the optimal performance on forest height estimation.

Экспериментальное исследование методики полевой оценки точности измерений ГНСС

The authors propose a field control of GNSS equipment precision characteristics methodology for recording sub-centimeter movements of the Earth`s surface at geodynamic observations of tectonically moderate areas activity. The factors influencing the accuracy of GNSS measurements are analyzed. The theoretical aspects of developing measuring equipment field control methods are presented. Testing of the devices was carried out in the course of surveys on the Nizhne-Kanskiy massif geodynamic range in Krasnoyarsk krai in 2020–2022. The experiment was made with two-system GNSS facilities of geodesic class (5 to 6 sets). The results show that the proposed methodology of the used tools accuracy characteristics field control enables detecting incorrect nominal parameters of measuring instruments. In this case the parameters of the receivers` antennas are well coordinated with each other. The exactness of control characteristics in plan is at the level of 1,3–2,5 mm, in height – 2,5 mm. It was revealed that the height of the actual phase center of Grant_G3T and MarAnt+ antennas differ from the manufacturer`s declared passport data

Unilateral Percutaneous Kyphoplasty In Patients With Painful Osteoporotic Vertebral Compression Fractures; Single Center Experience

ABSTRACT
 
 Aim
 The objective of this study is to evaluate the outcomes of unilateral percutaneous kyphoplasty (PKP) performed in treatment-resistant patients with osteoporotic vertebral fractures.
 
 Material and Methods
 The study sample consisted of eight patients with painful osteoporotic compression fractures who did not respond to conservative treatment methods. However, the respective clinical results were evaluated based on radiological findings pertaining to 18 operated vertebrae of the said eight patients. The Oswestry Disability Index (ODI) scores and Visual Analogue Scale (VAS) scores were recorded before the procedure and at the 1st-month and 6th-month follow-up visits. Vertebral angle (VA), and anterior height (AH), central height (CH) and posterior height (PH) of the superior and inferior endplates of the vertebrae were measured before the procedure and at the 6th-month follow-up using direct radiography.
 
 Results
 Mean VAS and ODI scores decreased 66.87% and 65.13%, respectively, over a 6-month period. The mean vertebral height increased after kyphoplasty, as reflected by a 4.70% increase in AH, 26.84% increase in CH and 1.63% increase in PH. Additionally, VA was found to have increased by 14.1%.
 
 Conclusion 
 The results of this study featuring a small patient population indicated that unilateral balloon PKP can be used safely and effectively to achieve earlier mobilization with faster pain relief and fewer complications.

Machine Learning-Based Approach to Wind Turbine Wake Prediction under Yawed Conditions

As wind energy continues to be a crucial part of sustainable power generation, the need for precise and efficient modeling of wind turbines, especially under yawed conditions, becomes increasingly significant. Addressing this, the current study introduces a machine learning-based symbolic regression approach for elucidating wake dynamics. Utilizing WindSE’s actuator line method (ALM) and Large Eddy Simulation (LES), we model an NREL 5-MW wind turbine under yaw conditions ranging from no yaw to 40 degrees. Leveraging a hold-out validation strategy, the model achieves robust hyper-parameter optimization, resulting in high predictive accuracy. While the model demonstrates remarkable precision in predicting wake deflection and velocity deficit at both the wake center and hub height, it shows a slight deviation at low downstream distances, which is less critical to our focus on large wind farm design. Nonetheless, our approach sets the stage for advancements in academic research and practical applications in the wind energy sector by providing an accurate and computationally efficient tool for wind farm optimization. This study establishes a new standard, filling a significant gap in the literature on the application of machine learning-based wake models for wind turbine yaw wake prediction.

Accuracy of computer-aided design trial restorations fabricated with different digital workflows

Trial restorations are a versatile tool for visualizing the esthetic treatment plan and should be an accurate replica of the planned smile design. The accuracy of conventionally fabricated trial restorations has been investigated; however, studies on the accuracy of different digital workflows for trial restoration fabrication are lacking. The purpose of this in vitro study was to evaluate the accuracy of computer-aided design (CAD) trial restorations fabricated with different digital workflows. A patient in need of additive esthetic treatment was examined, and intraoral and extraoral photographs and intraoral digital scans were made, followed by 3D digital smile design using the exocad software program. The reference virtual design was converted into trial restorations (N=40) by using different digital workflows: subtractive manufacturing, additive manufacturing, additive manufacturing of 3D designed index, and silicone index on an additively manufactured cast. Fabricated trial restorations of all groups were scanned with a desktop scanner, providing a standard tessellation language (STL) file serving as the test data for each trial restoration. All the STL files of the test and reference data were imported into a reverse engineering software program to evaluate the 3D trueness of each workflow. Also, analog and digital 2D linear measurements (maxillary left central incisor height, maxillary left central incisor width, and intercanine width) were made to assess any dimensional alterations between the fabricated trial restorations and the reference digital smile design. A 1-way analysis of variance (ANOVA) was used to analyze the data followed by the Tukey post hoc test (α=.05). For 3D trueness measurements, root mean square (RMS) values representing the deviations between the fabricated trial restorations and the reference digital smile design varied significantly among the different groups (P<.001), with the highest mean deviation found in the group of additive manufacturing of 3D designed index (0.21 ±0.01mm), while the lowest mean value of deviation was found in the group of subtractive manufacturing (0.11 ±0.02mm). For both the digital and analog 2D linear measurements, post hoc pairwise comparisons showed the group of additive manufacturing of 3D designed index to have significantly higher values of deviation than the other groups in all assigned measurements (P<.001). The accuracy of CAD trial restorations was affected by the fabrication technique, and implementing conventional steps in the digital workflows of trial restoration fabrication may result in discrepancies that affect accuracy when compared with the reference design.

Deep operator learning-based surrogate models with uncertainty quantification for optimizing internal cooling channel rib profiles

This paper focuses on designing surrogate models that have uncertainty quantification capabilities to effectively improve the thermal performance of rib-turbulated internal cooling channels. To construct the surrogate, we use the deep operator network (DeepONet) framework, a novel class of neural networks designed to approximate mappings between infinite-dimensional spaces using relatively small datasets. The proposed DeepONet takes an arbitrary rib geometry as input and outputs continuous detailed pressure and heat transfer distributions around the profiled ribs. The datasets needed to train and test the proposed DeepONet framework were obtained by simulating a 2D rib-roughened internal cooling channel. To accomplish this, we continuously modified the input rib geometry by adjusting the control points according to a simple random distribution with constraints, rather than following a predefined path or sampling method. The studied channel has a hydraulic diameter, Dh, of 66.7 mm, and a length-to-hydraulic diameter ratio, L/Dh, of 10. The ratio of rib center height to hydraulic diameter (e/Dh), which was not changed during the rib profile update, was maintained at a constant value of 0.048. The ribs were placed in the channel with a pitch-to-height ratio (P/e) of 10. In addition, we provide the proposed surrogates with effective uncertainty quantification capabilities. This is achieved by converting the DeepONet framework into a Bayesian DeepONet (B-DeepONet). B-DeepONet samples from the posterior distribution of DeepONet parameters using the novel framework of stochastic gradient replica-exchange MCMC. Finally, we demonstrate the performance of the proposed DeepONet-based surrogate models with uncertainty quantification by incorporating them into a constrained, gradient-free optimization problem that enhances the thermal performance of the rib-turbulated internal cooling channel.

Association of Subretinal Fluid Duration and Baseline Chorioretinal Structure With Optical Coherence Tomography in Central Serous Chorioretinopathy.

This study investigated the association between subretinal fluid (SRF) duration and baseline chorioretinal structure in patients with naïve (first-episode and untreated) central serous chorioretinopathy (CSC). We divided 59 patients into non-prolonged (<3months) and prolonged (>3months) groups based on SRF fluid persistence from the initial visit. The follow-up period varied as the shorter duration was chosen between SRF disappearance time and 3months from the initial visit. We measured the central retinal thickness (CRT), central choroidal thickness (CCT), SRF height (SRFH), and outer nuclear layer thickness (ONL) using spectral-domain optical coherence tomography (SD-OCT) at the initial visit and recorded SRF duration. We compared these parameters between the groups, conducted multivariate analysis for SRF duration of more than 3months, and investigated the correlation among CCT and CRT, SRFH, or ONL, and among SRF duration and CRT, CCT, SRFH, or ONL. CCT was significantly thicker in the prolonged than in the non-prolonged group at the initial visit (P = 0.044) and significantly correlated with CRT and SRFH (P = 0.007, r = 0.35 and P = 0.002, r = 0.39). SRF duration significantly correlated with CRT and SRFH (P = 0.009, r = 0.40 and P = 0.003, r = 0.41). The optimal model for SRF duration more than 3months included age (P = 0.054) and CCT (P = 0.008). Thicker baseline CCT can lead to a longer SRF duration in naïve CSC. This association aids in early detection of cases at a higher risk of prolonged SRF.

Validation of central peak height method for final adult height predictions on long leg radiographs.

Accurate skeletal age and final adult height prediction methods in paediatric orthopaedics are crucial for determining optimal timing of growth-guiding interventions and minimizing complications in treatments of various conditions. This study aimed to evaluate the accuracy of final adult height predictions using the central peak height (CPH) method with long leg X-rays and four different multiplier tables. This study included 31 patients who underwent temporary hemiepiphysiodesis for varus or valgus deformity of the leg between 2014 and 2020. The skeletal age at surgical intervention was evaluated using the CPH method with long leg radiographs. The true final adult height (FHTRUE) was determined when the growth plates were closed. The final height prediction accuracy of four different multiplier tables (1. Bayley and Pinneau; 2. Paley et al; 3. Sanders - Greulich and Pyle (SGP); and 4. Sanders - peak height velocity (PHV)) was then compared using either skeletal age or chronological age. All final adult height predictions overestimated the FHTRUE, with the SGP multiplier table having the lowest overestimation and lowest absolute deviation when using both chronological age and skeletal age. There were no significant differences in final height prediction accuracy between using skeletal age and chronological age with PHV (p = 0.652) or SGP multiplier tables (p = 0.969). Adult height predictions with chronological age and SGP (r = 0.769; p ≤ 0.001), as well as chronological age and PHV (r = 0.822; p ≤ 0.001), showed higher correlations with FHTRUE than predictions with skeletal age and SGP (r = 0.657; p ≤ 0.001) or skeletal age and PHV (r = 0.707; p ≤ 0.001). There was no significant improvement in adult height prediction accuracy when using the CPH method compared to chronological age alone. The study concludes that there is no advantage in routinely using the CPH method for skeletal age determination over the simple use of chronological age. The findings highlight the need for more accurate methods to predict final adult height in contemporary patient populations.

НЕКОТОРЫЕ АСПЕКТЫ ДИАГНОСТИКИ И ПРОФИЛАКТИКИ НЕДОСТАТОЧНОСТИ ТАЗОВОГО ДНА У ЖЕНЩИН РЕПРОДУКТИВНОГО ВОЗРАСТА

The aim of the study: to assess the significance of the study of the state of the pelvic floor in women of reproductive age who have risk factors for the development of pelvic organ plolapse; to evaluate the effectiveness of an electric exercise machine in combination with Kegel exercises in the preven-tion of pelvic organ prolapse. Matherial and methods: 363 women with a history of vaginal childbirth were examined, which, depending on parity and body mass index, were divided into 4 groups. Ultra-sound measurement of the height of the tendon center of the perineum, the width of the muscle bun-dles of the levator legs (m. bulbospongiosus, m. bulbocavernosus), the angle of urethral incline (alpha angle), vesico-urethral angle (betta angle), the length of the urethra was performed. The results of the study: obtained indicate the expediency of performing ultrasound scans with study of the muscles that form the pelvic floor in women who gave birth with perineal trauma, for early detection of pelvic floor insolvency. The effectiveness of using electric exercise machines in combination with a set of physical exercises to strengthen the pelvic floor muscles in women with preclinical manifestations of pelvic floor muscle failure has been proven.

A long short-term memory modeling-based compensation method for muscle synergy.

Muscle synergy containing temporal and spatial patterns of muscle activity has been frequently used in prediction of kinematic characteristics. However, there is often some discrepancy between the predicted results based on muscle synergy and the actual movement performance. This study aims to propose a new method for compensating muscle synergy that allows the compensated synergy signal to predict kinematic characteristics more accurately. The study used the change of direction in running as background. Non-negative matrix factorisation was used to extract the muscle synergy during the change of direction at different angles. A non-linear association between synergy and the height of pelvic mass centre was established using long and short-term memory neural networks. Based on this model, the height fluctuations of the pelvic centre of mass are used as input and predict the fluctuations of the synergy which were used to compensate for the original synergy in different ways. The accuracy of the synergies compensated in different ways in predicting pelvic centre of mass movement was then assessed by back propagation neural networks. It was found that the compensated synergy significantly improves accuracy in predicting pelvic centre of mass displacement (R2, p<0.05). The predicted results of all-compensation are significantly different from actual performance in the end-swing (p<0.05). The predicted results of half-compensation do not differ significantly from the actual performance, and its damage to the original synergy is smaller and does not increase with angle compared to all-compensation. The all-compensation may be affected by individual variability and lead to increased errors. The half-compensation can improve the predictive accuracy of the synergy while reducing the adjustment to the original synergy.

Three-Dimensional Analysis of Windlass Mechanism Using Loading Computed Tomography in Patients With Hallux Rigidus and Healthy Volunteers

Category: Midfoot/Forefoot; Basic Sciences/Biologics Introduction/Purpose: The windlass mechanism (WM) increases the height of the medial longitudinal arch (MLA) of the foot by tensing the plantar aponeurosis during dorsiflexion of the metatarsophalangeal (MTP) joint. We speculated that this mechanism may be deeply involved in the pathogenesis of forefoot diseases such as hallux rigidus (HR). These conditions are three- dimensional (3D) deformities including rotational deformity, but the role of the WM has been evaluated only two-dimensionally by measuring the height of the navicular on lateral plain radiographs. The purpose of this study was to analyze in detail the WM of normal and HR feet in 3D. Methods: Participants were 14 patients with HR (17 feet) and 13 volunteers (21 feet). The volunteers had no history of foot disease or trauma, whereas the patients with HR had Coughlin and Shurnas classification I or II. Computed tomography (CT) of the foot with a load equivalent to the participant’s body weight was performed. Imaging was performed with the 1st MTP joint in the neutral position and dorsiflexed 30 degrees. 3D models were created using the software Mimics Research 17.0. Next, we used the iterative closest point (ICP) algorithm, which allows 3D objects to be superimposed without specifying anatomical feature points. Then, we performed 3D measurements of the (1) rotation of each bone in the MLA with respect to the tibia, (2) rotation of the distal bone in each joint of the MLA, and (3) changes in the height of the geometric center of the navicular. Results: At the calcaneus, navicular and medial cuneiform, the HR group showed less inversion, adduction than healthy group. (P &lt; 0.05) At the talonavicular joint, the navicular was 3.7° inversion, 2.9° adduction in the healthy group and 2.4°inversion, 1.3° adduction in the HR group. At the talocalcaneal joint, the calcaneus was 1.7° inversion, 1.5° adduction in the healthy group and 0.9°inversion, 0.6° adduction in the HR group. In the talonavicular and talocalcaneal joint, the HR group showed less inversion and adduction than control. (P &lt; 0.05) With dorsiflexion of the hallux, the height of the navicular increased by 2.1 mm in the healthy group and 1.3 mm in the HR group. There was a significant difference (P &lt; 0.05) between the two groups. Conclusion: In both groups, the calcaneus, navicular, and medial cuneiform bones moved not only in the sagittal plane but also in the frontal plane. But the movement of the talonavicular and talocalcaneal joints and the change in height of the navicular were significantly reduced compared with the healthy group. In other words, in the HR group, the motion of the midfoot and hindfoot was limited, suggesting that there may be a close relationship between WM dysfunction and midfoot and hindfoot motion. This study indicates that the dysfunction of the WM may have been a clue to the cause of HR.

Evaluation of eyebrow position and upper eyelid laxity after endolift laser treatment.

The periorbital area is one of the most sensitive areas in the face, and many techniques are used to change the eyelid laxity and position of the eyebrows. Recently the use of noninvasive or minimally invasive techniques is developed so, the amount of surgical procedures has decreased. In the present study. We evaluate the effect of Endolift laser as a non-invasive method on upper eyelid laxity and eyebrow position. Nine patients underwent Endolift laser and evaluated for eyelid laxity and change in eyebrow position. Two blinded physicians assessed the cosmetic outcome of improvement in upper eyelid tightening via photography 6 months post-treatment. The physicians evaluated the patient's improvement degree using the photographs by two clinical factors: skin laxity and total cosmetic result. Also, eyebrow height from the center of the pupil (CPEBH), Central eyebrow height (CEBH), Lateral eyebrow height (LEBH), Medial eyebrow height (MEBH) were measured by ImagJ before and 6 months post Endolift laser treatment. Our results showed eyelid laxity and eyebrow height were significantly changed after treatment.

НЕКОТОРЫЕ АСПЕКТЫ ДИАГНОСТИКИ И ПРОФИЛАКТИКИ НЕДОСТАТОЧНОСТИ ТАЗОВОГО ДНА У ЖЕНЩИН РЕПРОДУКТИВНОГО ВОЗРАСТА

The aim of the study: to assess the significance of the study of the state of the pelvic floor in women of reproductive age who have risk factors for the development of pelvic organ plolapse; to evaluate the effectiveness of an electric exercise machine in combination with Kegel exercises in the preven-tion of pelvic organ prolapse. Matherial and methods: 363 women with a history of vaginal childbirth were examined, which, depending on parity and body mass index, were divided into 4 groups. Ultra-sound measurement of the height of the tendon center of the perineum, the width of the muscle bun-dles of the levator legs (m. bulbospongiosus, m. bulbocavernosus), the angle of urethral incline (alpha angle), vesico-urethral angle (betta angle), the length of the urethra was performed. The results of the study: obtained indicate the expediency of performing ultrasound scans with study of the muscles that form the pelvic floor in women who gave birth with perineal trauma, for early detection of pelvic floor insolvency. The effectiveness of using electric exercise machines in combination with a set of physical exercises to strengthen the pelvic floor muscles in women with preclinical manifestations of pelvic floor muscle failure has been proven.

基于 EDEM 的双滚轮破碎装置优化设计

Straw found in the field can be conveniently stored and transported through mechanical packaging, and it undergoes crushing during its utilization. The effectiveness of the crushing process directly impacts the efficiency of material utilization. However, current crushing devices available in the market lack specialized mechanisms suitable for the unique characteristics of round corn stalks. To address this issue, the necessary simulation parameters were determined, and an experiment was conducted using the ternary quadratic combination test method. The test factors considered were the center height difference of the knife roller, lower roller speed, and cutter thickness. The response value of the experiment was the material crushing rate. By analyzing the results, the optimal structural parameters were identified. These included a center height difference of 390 mm for the knife roller, a lower roller speed of 14 rpm, and a cutter thickness of 110 mm. With these parameters, the crushing rate of the round straw crushing device reached 93.77%, and the particle passing ratio was 98.52%. To validate the research findings, a test device was constructed and used to confirm the reliability of the obtained results.

An Investigation on Stress States of the Cataclastic Rock Specimen under Confined Compression Based on Modified Thick-walled Cylinder Model

In high in-situ stress zones, cataclastic rocks have exerted a significant influence on the stability of engineering structures. However, the mechanical properties of cataclastic rocks can not be accurately studied due to difficulties in sampling and laboratory testing. In this paper, laterally confined compression tests for specimens that were obtained by the developed in-situ sampling devices were performed to investigate the stress states. A modified thick-walled cylinder model considering axial shear stress was introduced. The interaction mechanics model for a compressed sample and an equivalent single-layer cylinder was established. Based on the principle of elasticity, the laterally confined stress, the axial shear stress, and the axial stress of the sample were derived and obtained. Moreover, the effects of mechanical and geometric parameters of the equivalent cylinder on the force condition of the specimen were analyzed. The results show that the confined stress is positively correlated with the equivalent elastic modulus and the geometric factor. Therefore, the confined stress can be strengthened by increasing the elastic modulus, alternatively, increasing the outer diameter and decreasing the inner diameter. However, the axial stress is little affected by the equivalent elastic modulus and the geometric factor and is not affected by the equivalent Poisson's ratio. As the distance from the center height increases, the axial stress decreases linearly and the difference in axial stress becomes larger considering axial shear stress and ignoring axial shear stress.

Comparison of Dynamic Vault Changes Following Implantation of Two Different Models of Phakic Intraocular Lenses.

To compare the dynamic vault range (the difference in the central vault height from scotopic to photopic light condition) after implantation of the ICL/TICL (STAAR Surgical) and Eyecryl phakic/Eyecryl phakic toric intraocular lens (IOL) (Biotech Healthcare). This retrospective study included patients with myopia or myopic astigmatism eligible for phakic IOL implantation with either the ICL/TICL or Eyecryl phakic/Eyecryl phakic toric IOL. Vault changes in varying light conditions (scotopic, mesopic, and photopic) were assessed using an anterior segment optical coherence tomography-based tomographer and dynamic vault range (DVR) was compared between the two groups. A total of 60 eyes from 36 patients (30 eyes in each group) with a mean age of 28.63 ± 6.36 years were included. The mean postoperative follow-up at the time of assessment was 9.4 ± 5.3 and 8.9 ± 5.28 months (P = .75) in the ICL and Eyecryl groups, respectively. The mean values of scotopic, mesopic, and photopic vault were 490.56 ± 238.64, 453.56 ± 224.30, and 373.96 ± 200.24 μm in the ICL group and 515.46 ± 174.34, 490.26 ± 184.04, 450.43 ± 173.92 μm in the Eyecryl group (P = .32, .24, and .05, respectively). The DVR was 116.6 ± 59.29 μm in the ICL group versus 65.03 ± 31.78 μm in the Eyecryl group (P < .001). The Eyecryl phakic IOL showed significantly fewer light-induced changes in the central vault height (DVR) compared to the ICL, which may be attributed to the difference in the material of the two phakic IOL models. This may be clinically significant in eyes with low postoperative vaults with respect to their follow-up and risk assessment of cataractogenesis in the long term. [J Refract Surg. 2023;39(8):546-554.].

Minimally invasive techniques for lateral maxillary sinus floor elevation: small lateral window and one-stage surgery—a 2–5-year retrospective study

This study aimed to introduce a minimally invasive technique for maxillary sinus floor elevation using the lateral approach (lSFE) and to determine the factors that influence the stability of the grafted area in the sinus cavity. Thirty patients (30 implants) treated with lSFE using minimally invasive techniques from 2015 to 2019 were included in the study. Five aspects of the implant (central, mesial, distal, buccal, and palatal bone heights [BHs]) were measured using cone-beam computed tomography (CBCT) before implant surgery, immediately after surgery (T0), 6 months after surgery (T1), and at the last follow-up visit (T2). Patients’ characteristics were collected. A small bone window (height, (4.40 ± 0.74) mm; length, (6.26 ± 1.03) mm) was prepared. No implant failed during the follow-up period (3.67 ± 1.75) years. Three of the 30 implants exhibited perforations. Changes in BH of the five aspects of implants showed strong correlations with each other and BH decreased dramatically before second-stage surgery. Residual bone height (RBH) did not significantly influence BH changes, whereas smoking status and type of bone graft materials were the potentially influential factors. During the approximate three-year observation period, lSFE with a minimally invasive technique demonstrated high implant survival rate and limited bone reduction in grafted area. In conclusion, lSFE using minimally invasive techniques was a viable treatment option. Patients who were nonsmokers and whose sinus cavity was filled with deproteinized bovine bone mineral (DBBM) had significantly limited bone resorption in grafted area.

Analysis of Hairline and Forehead Sexual Dimorphic Aesthetics in 60 Celebrities Using Artificial Intelligence.

Thirty white female and 30 white male celebrities were included. Three full-face front-view photographs of each celebrity were evaluated by a facial analysis program, using Vision framework and MATLAB. After converting pixel distances to absolute distances, midline and lateral forehead heights were calculated and compared between men and women. Forehead height was similar between attractive men and women, but forehead width was shorter in women. Analysis of forehead height at various points along the hairline demonstrated that forehead measurements above the lateral brow and brow peak were significantly greater in men. Mean forehead height above the lateral eyebrow was 3.51 cm in women and 4.16 cm in men (P = 0.017). Forehead height above the eyebrow peak was 4.34 cm in women and 5.55 cm in men (P < 0.001). Medial forehead height was similar between men and women, indicating that the greatest difference in attractive male and female foreheads is in the lateral forehead and forehead width. Analysis of attractive white celebrities demonstrated no significant differences in central forehead heights between men and women. Forehead width and lateral forehead height were significantly smaller in women, with an overall downward slanting contour. Male hairlines were more horizontal and slanting upward laterally. These results have implications in facial rejuvenation and facial gender-affirming surgery.