Evolving horizons in renal angiomyolipoma: two decades of management strategies and clinical perspectives in a single institutional study.

OBJECTIVE: To assess various management options for renal angiomyolipoma (AML) to guide clinical practice. METHODS: A single center retrospectively reviewed an AML series from 2002 to 2022. The image reports and chart reviews of patients who received two abdominal scans at least 6 months between the first and last scans were assessed. RESULTS: A total of 203 patients with 209 tumors were identified and followed up for a median of 42.6 months. Active surveillance (AS) was the most frequently selected option (70.9% of cases). Interventions were required for 59 AMLs, of which 20 were treated with embolization, 29 with partial nephrectomy, 9 with radical nephrectomy, and 1 with radiofrequency (RF) ablation. The median size of the lesions at intervention was 5 cm. The average growth rate of the lesions was 0.12 cm/year, and there was a significant difference in the average growth rate of lesions ≤4 cm and those >4 cm (0.11 vs. 0.24 cm/year; p = 0.0046). CONCLUSION: This series on AMLs confirms that lesions >4 cm do not require early intervention based on size alone. Appropriately selected cases of renal AML can be managed by AS.KEYWORDS: Angiomyolipoma; active surveillance; embolization; nephrectomy; nephron-sparing surgery.

Exploring the impact of digital health literacy on quality of life in patients undergoing retrograde intrarenal surgery for kidney stone treatment: a prospective, single-center study.

Retrograde intrarenal surgery (RIRS) is the recommended treatment for renal stones up to two cm in size. As digital health literacy (e-HL) has become increasingly important in promoting informed health decisions and healthy behaviors, it is necessary to investigate its impact on RIRS treatment outcomes. We aimed to explore the influence of patients' e-HL level on their postoperative quality of life (QoL). We conducted an observational prospective study of 111 patients who underwent RIRS for renal pelvis stones. Before RIRS, we evaluated patients' e-HL using the electronic health literacy scale (eHEALS). QoL was evaluated using the five-level EuroQol five-dimensional questionnaire (EQ-5D-5L) one month after RIRS. SFR was determined by a negative CT scan or asymptomatic patients with stone fragments < 3 mm. Adult individuals aged 18 years or older with typical calyceal anatomy met the eligibility criteria for enrollment. Exclusion criteria for the study included patients with ureteric stones, anomalous kidneys, or bilateral renal stones. The relationship between patients' QoL and stone-free rate was explored using Spearman's rank correlation coefficient. The mean stone burden was 14 ± 3 mm (6-19 mm). The overall SFR was 83.3% after one month. The median EQ-5D-5L utility index and VAS score were 0.826 (0.41-1) and 70 (20-100) respectively, for the overall population. We found that poorer e-HL was associated with being older (p = 0.035), having less education (p = 0.005), and not having access to the internet (p < 0.001). A significant difference was observed between patients with sufficient e-HL and patients with limited e-HL in the self-care (p = 0.02) and anxiety/depression (p = 0.021) dimensions. To date, no study has examined the impact of patients' e-HL levels on postoperative QoL in patients undergoing RIRS. This study also revealed that e-HL levels in patients undergoing RIRS were related to postoperative QoL, especially self-care and anxiety/depression dimensions, whereas there was no relationship between them and SFR.

Impact of health and digital health literacy on quality of life following radical prostatectomy for prostate cancer: prospective single-center cohort study.

PURPOSE: The importance of health literacy (HL) and digital health literacy (e-HL) in promoting healthy behavior and informed decision making is becoming increasingly apparent. This study aimed to assess the effects of HL and e-HL on the quality of life (QoL) of men who underwent radical prostatectomy (RP) for localized prostate cancer. MATERIALS AND METHODS: This prospective observational study included 104 patients who underwent RP for localized prostate cancer. HL and e-HL were evaluated using the validated eHealth Literacy Scale and European Health Literacy Survey Questionnaire Short Form before RP. We evaluated patients' physical, psychological, social, and global QoL using the validated EORTC QLQ-C30 8 weeks after RP. The exclusion criterion was any difficulties in language and comprehension. We employed one-way ANOVA to compare continuous variables across groups in univariate analysis and used MANOVA for exploring relationships among multiple continuous variables and groups in the multivariate analysis. RESULTS: Multivariate analyses showed that poorer e-HL and HL were associated with being older (p = 0.019), having less education (p < 0.001), and not having access to the internet (p < 0.001). Logistic regression analysis revealed significant associations between improved e-HL (p = 0.043) and HL (p = 0.023), better global health status, and higher emotional functioning (p = 0.011). However, the symptom scales did not differ significantly between the e-HL and HL groups. CONCLUSION: Our study showed a positive association between self-reported HL/e-HL and QoL, marking the first report on the impact of HL/e-HL on the QoL in men who underwent RP for clinically localized prostate cancer.

A comparison of pre- and post-operative outcomes in living donors undergoing transperitoneal laparoscopic nephrectomy and open nephrectomy: a retrospective single-center study.

BACKGROUND: Kidney transplantation is often regarded as the preferred therapy for end-stage renal disease. Several surgical procedures have been developed to reduce postoperative donor complications, while maintaining kidney quality. OBJECTIVE: This study aimed to compare the preoperative and postoperative outcomes of living kidney donors who underwent either transperitoneal laparoscopic nephrectomy or open nephrectomy. DESIGN AND SETTING: Retrospective study conducted in Istanbul, Turkey. METHODS: Fifty-five living-related kidney donors underwent nephrectomy and were retrospectively divided into two groups: 21 donors who underwent open nephrectomy (Group 1) and 34 donors who underwent transperitoneal laparoscopic nephrectomy (Group 2). RESULTS: In comparison to the donors who underwent open nephrectomy, those who underwent transperitoneal laparoscopic nephrectomy had significantly shorter postoperative hospital stays (2.3 ± 0.2 versus 3.8 ± 0.8 days, P = 0.003), duration of urinary catheterization (1.2 ± 0.8 days versus 2.0 ± 0.7 days, P = 0.0001), operating times (210 ± 27 minutes versus 185 ± 24 minutes, P = 0.02), and less blood loss (86 ml versus 142 ml, P = 0.048). There was no statistically significant difference between the two groups with regard to the estimated blood transfusion and warm ischemia time. The preoperative week, first postoperative week, and 1-month postoperative serum creatinine levels were comparable between the groups. CONCLUSIONS: Laparoscopic donor nephrectomy can be safely performed at centers with expertise in laparoscopic surgery. Laparoscopic donor nephrectomy has better outcomes than open donor nephrectomy in terms of length of hospital stay, duration of urinary catheterization, operating time, and blood loss.

Paratesticular Dedifferentiated Liposarcoma with Rhabdomyoblastic Differentiation: A Case Report and Review of the Literature.

Liposarcomas of the paratesticular tissue is a rare pathological entity. The symptoms are similar to inguinal hernias or hydroceles. We present the case of an 84-year-old man with a rare paratesticular liposarcoma that manifested as painless right hemiscrotal swelling. Testicular tumour markers were negative. Imaging revealed a heterogeneous mass with a fat component. He underwent a radical orchiectomy on the left side to remove the associated mass. This revealed dedifferentiated liposarcoma (DDLS) with rhabdomyoblastic differentiation and MDM2 amplification. The surgical margins were negative, and the patient had a metastatic workup that included magnetic resonance imaging (MRI) of the abdomen and pelvis. Because of the disease's rarity, there is no clear agreement on radiotherapy and chemotherapy roles.

Assessment of redox homeostasis via genotoxicity, cytotoxicity, apoptosis and NRF-2 in colorectal cancer cell lines after treatment with Ganoderma lucidum extract.

This study aimed to investigate the cytotoxic and apoptotic effects of Ganoderma lucidum, Pleurotus ostreatus, Pleurotus eryngii, and Inonotus hispidus fungal extracts on HT-29 and HCT-116 colorectal cancer cell lines and to search the DNA damage and oxidative stress caused by these extracts. Accordingly, mushroom extracts were applied to colorectal cancer cell lines in vitro, and the IC50 result was obtained with the MTT test. According to the IC50 result, Ganoderma lucidum extract had the most effective cytotoxicity value among all used mushroom extracts. TAS, TOS, and NRF-2 tests were used to investigate the molecular effect of Ganoderma lucidum extract on oxidative stress; the DNA ladder test was performed to assess DNA damage, the Scratch assay method was applied for cell migration analysis, and the colony assay was used to determine the colony formation potential of the cells. The results showed that Ganoderma lucidum mushroom extract reduces cell proliferation, colony formation, and NRF-2, induces DNA damage, slows cell migration, and increases oxidative stress. This study shows that Ganoderma lucidum mushroom extract reduces cell proliferation through damaging cellular DNA and has a cytotoxic effect in colorectal cancer cell lines.

The use of nonnormalized surface EMG and feature inputs for LSTM-based powered ankle prosthesis control algorithm development.

Advancements in instrumentation support improved powered ankle prostheses hardware development. However, control algorithms have limitations regarding number and type of sensors utilized and achieving autonomous adaptation, which is key to a natural ambulation. Surface electromyogram (sEMG) sensors are promising. With a minimized number of sEMG inputs an economic control algorithm can be developed, whereas limiting the use of lower leg muscles will provide a practical algorithm for both ankle disarticulation and transtibial amputation. To determine appropriate sensor combinations, a systematic assessment of the predictive success of variations of multiple sEMG inputs in estimating ankle position and moment has to conducted. More importantly, tackling the use of nonnormalized sEMG data in such algorithm development to overcome processing complexities in real-time is essential, but lacking. We used healthy population level walking data to (1) develop sagittal ankle position and moment predicting algorithms using nonnormalized sEMG, and (2) rank all muscle combinations based on success to determine economic and practical algorithms. Eight lower extremity muscles were studied as sEMG inputs to a long-short-term memory (LSTM) neural network architecture: tibialis anterior (TA), soleus (SO), medial gastrocnemius (MG), peroneus longus (PL), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF) and gluteus maximus (GMax). Five features extracted from nonnormalized sEMG amplitudes were used: integrated EMG (IEMG), mean absolute value (MAV), Willison amplitude (WAMP), root mean square (RMS) and waveform length (WL). Muscle and feature combination variations were ranked using Pearson's correlation coefficient (r > 0.90 indicates successful correlations), the root-mean-square error and one-dimensional statistical parametric mapping between the original data and LSTM response. The results showed that IEMG+WL yields the best feature combination performance. The best performing variation was MG + RF + VM (rposition = 0.9099 and rmoment = 0.9707) whereas, PL (rposition = 0.9001, rmoment = 0.9703) and GMax+VM (rposition = 0.9010, rmoment = 0.9718) were distinguished as the economic and practical variations, respectively. The study established for the first time the use of nonnormalized sEMG in control algorithm development for level walking.

Effect of different sealer activation techniques on dentinal tubule penetration.

The aim of this study was to evaluate the influence of different activation techniques on dentin tubule penetration of root canal sealer. Seventy-five teeth with single canals were chemomechanically prepared. A calcium silicate-based sealer was stained with a fluorescent dye (rhodamine B), placed into the canals and activated according to the following groups: control (no activation), EDDY, EndoActivator, ultrasonic and XP-Endo Finisher. Then, the samples were obturated. The percentages of sealer penetration at various depth levels of root sections were measured with confocal laser scanning microscopy. XP-Endo Finisher presented the highest penetration at 50 µm (p < 0.05). XP-Endo Finisher showed similar penetration with EDDY at 100 and 200 µm (p > 0.05) while presented higher penetration than the other groups (p < 0.05). At 500 µm, XP-Endo Finisher presented higher penetration than EndoActivator (p < 0.05) while similar penetration with the other groups (p > 0.05). XP-Endo Finisher can be recommended for activation during sealer placement for better penetration into dentin tubules.

The Role of Educational Level and Cognitive Status in Men Undergoing Artificial Urinary Sphincter Implantation.

OBJECTIVE: To examine the relationship between education level, cognitive function of patients and the success/ revision rates of artificial urinary sphincter (AUS) implantation in men with postprostatectomy incontinence. METHODS: Between January 2010 and March 2018, 163 patients (mean age, 68 ± 6.8 years) with moderate-to-severe stress urinary incontinence who underwent AUS implantation were retrospectively examined. Demographic data, body mass index, comorbidities, surgical technique, previous strictures, and radiation therapy were recorded. Incontinence was measured by daily pad use and evaluated by International Consultation on Incontinence Questionnaire-short form. Patients' overall improvement was assessed using the Patient Global Impression of Improvement questionnaire. Education level was determined using the International Standard Classification of Education. Cognitive status was assessed using the Mini-Mental State Examination. Treatment success was defined as the need for ≤1 pad/day at last follow-up. RESULTS: AUS was successful in 77.3% of patients. The International Consultation on Incontinence Questionnaire-short form score improved significantly from 19.9 ± 2.9 to 4.4 ± 5.4 (P = .001). The median outcome reported subjectively on the Patient Global Impression of Improvement scale was 2.1 ± 1.5 (1-7) and self-reported as "much better." Patients' education level had statistically no significant relationship with AUS success and revision rates. Similarly, there was no significant relationship between cognitive status, educational level and the need for revision of AUS (P >.05). However, patients with moderate cognitive impairment and a body mass index >30 showed significantly lower AUS success rates (P <.05). CONCLUSION: AUS implantation is safe and effective treatment option especially for nonobese and cognitively intact patients of all educational levels.

Investigation of the Effectiveness of Surgical Treatment on Respiratory Functions in Patients With Obstructive Sleep Apnea Syndrome.

OBJECTIVE: Obstructive sleep apnea syndrome (OSAS) is a problem that involves many bodily systems and its effects on the respiratory system deserve special attention. Although many studies exist that investigate respiratory functions in patients using continuous positive airway pressure (CPAP) for the treatment of sleep apnea, there is a lack of research regarding the effect of OSAS surgery on respiratory function in the literature, which has motivated us to perform such a study. MATERIALS AND METHODS: Thirty-two patients diagnosed with OSAS with an apnea hypopnea index ranging between 15 and 30 and had undergone robotic tongue base resection and uvulopharyngoplasty were included as study participants. Pulmonary function tests were performed on all participants 1 day prior to, and at 3 and 6 months after the operation. Weight and body mass indices (BMIs) were also recorded at the same intervals for all participants. Data were electronically recorded and analyzed through SPSS 22.0. Values of P < .05 have been considered as statistically significant. RESULTS: Average age of the 32 participants was 43.2±10.7, average body weight was 94.1±12.6, and average BMI was 31.4±4.7. Decreases in body weight and BMI values recorded at 3 and 6 months postoperatively had statistical significance when compared with values recorded preoperatively (P < .05). Comparisons made in terms of pulmonary functions revealed a statistically significant increase in 3 and 6-month postoperative values of FVC, FEV1, FEV1/FVC, PEF, and FEF 25-75 (P < .05). CONCLUSION: Our study shows the positive effects of robotic tongue base resection and uvulopharyngoplasty operation on respiratory function parameters. This suggests that surgical treatment in OSAS patients is as effective as CPAP on respiratory function.

Single-incision midurethral sling shows less pain and similar success rate in a short-term follow-up compared to the transobturator tape method in the treatment of stress urinary incontinence.

OBJECTIVE: To compare the efficacy, complications, quality of life, and patient satisfaction rates in women treated for stress urinary incontinence (SUI) using the adjustable anchored single-incision midurethral sling (SIMS) and standard midurethral sling (MUS) procedures. MATERIAL AND METHODS: A total of 113 women between October 2012 and October 2016 underwent either the adjustable SIMS (n=54) or MUS (n=57) procedure. The postoperative pain profile was assessed using a 10-point visual analog scale at the fixed time-point quality of life and an additional postoperative 3rd week appointment. We asked our patients the following two questions to evaluate their satisfaction with surgery and their preference: "Would you have this kind of surgery again?" (Q1), and "Would you recommend this type of surgery to another patient with same symptoms?" (Q2). For the evaluation of patient complaints, the Incontinence Impact Questionnaire (IIQ-7) and Urinary Distress Inventory (UDI-6) were used before and after the procedure. RESULTS: Women in the SIMS group had a significantly lower postoperative pain profile for up to 3 weeks (p<0.001). There was no significant difference in perioperative complications and postoperative continence rates between the groups. With regard to Q1 and Q2, a significant difference was found between the groups (p=0.003 and p=0.002, respectively). While the questionnaire scores of the IIQ-7 and UDI-6 were also significantly improved at postoperative evaluations (p<0.001), there was no significant difference between the two groups. CONCLUSION: SIMS is associated with a significantly improved postoperative pain profile and earlier return to work when compared to MUS.

Do success rate, complications of transobturator tape procedure differ based on experienced surgeon or residents? / ¿Son diferentes las tasas de éxito y complicaciones de la malla transobturatriz entre cirujanos expertos y residentes?

OBJECTIVES: To investigate the postoperative surgical complications and patient satisfaction with the outside-in transobturator tape (TOT) procedure performed by an experienced surgeon compared to those performed by residents in training. METHODS: Patients who received TOT surgery performed by a resident under supervision of a faculty were included in group 1 (n = 31) whereas, patients operated by the same faculty were included in group 2 (n = 26). Both groups were compared for demographic data, procedure results, satisfaction rates as well as intraoperative and early postoperative (urinary retention, vaginal erosion, dyspareunia, infection, abnormal discharge) complications. Statistical Package for Social Sciences for Windows was used for statistical analyses. For continuous variables Mann-Whitney U test and for categorical variables Chi-square, Fishers exact tests were used. RESULTS: Stress incontinence in groups 1 and 2 were either completely cured or improved in 87.1% and 84.6%, respectively. The question" Would you like to have an operation like this again?" was answered positively by 26 (83.9%) of patients in group 1 and by 22 (84.6%) in group 2. There was no significant difference between two groups for the complication rates occurred within 90-days period. However, there was a significantly higher groin pain persisting more than three weeks in group 1 (38.7%) compared to group 2 patients (7.7%). CONCLUSIONS: There was statistically significant increased groin pain in the early period in TOT procedures performed by the residents. However, the complications observed in both groups did not affect the success rate or patient satisfaction.

OBJETIVOS: Investigar las complicaciones quirúrgicas postoperatorias y la satisfacción del paciente con la operacion de malla transonbturatriz fuera-adentro realizada por un cirujano experto en comparación con la realizada por residentes en formación.MÉTODOS: Las pacientes operadas de TOT por un residente bajo supervisión de un adjunto se incluyeron en el grupo 1 (n = 31) y las operadas por el mismo adjunto se incluyeron en el grupo 2 (n = 26). Se compararon los datos demográficos, resultados de la operación, tasas de satisfacción así como las complicaciones intraoperatorias y postoperatorias tempranas (retención urinaria, erosión vaginal, dispareumia, infeccion, flujo anormal). Para el análisis estadístico se utilizó el software SPSS para Windows. Se utilizaron el test de la U de Mann- Whitney para variables continuas y los de Chi cuadrado y Prueba exacta de Fisher para variables categóricas. RESULTADOS: La incontinencia urinaria de esfuerzo en los grupos 1 y 2 fue bien completamente curada, bien mejoró en 87,1% y 84,6%, respectivamente. La pregunta ¿volvería a someterse a la misma operación? fue respondida positivamente por 26 (83,9%) de los pacientes en el grupo 1 y 22 (84,6%) en el grupo 2. No había diferencias estadísticamente significativas entre los grupos en la tasa de complicaciones en los primeros 90 días. Sin embargo, el dolor en la ingle que persistía más de 3 semanas era significativamente mayor en el grupo 1 (38,7%) en comparación con las pacientes del grupo 2 (7,7%). CONCLUSIONES: Hay un aumento estadisticamente significativo del dolor en el muslo en el periodo postoperatorio temprano de las operaciones de TOT realizadas por residentes. Sin embargo, las complicaciones observadas en ambos grupos no afectaron a la tasa de éxitos o a la satisfaccion del paciente.

Do success rate, complications of transobturator tape procedure differ based on experienced surgeon or residents? / ¿Son diferentes las tasas de éxito y complicaciones de la malla transobturatriz entre cirujanos expertos y residentes?

Objectives: To investigate the postoperative surgical complications and patient satisfaction with the outside-in transobturator tape (TOT) procedure performed by an experienced surgeon compared to those performed by residents in training. Methods: Patients who received TOT surgery performed by a resident under supervision of a faculty were included in group 1 (n=31) whereas, patients operated by the same faculty were included in group 2 (n=26). Both groups were compared for demographic data, procedure results, satisfaction rates as well as intraoperative and early postoperative (urinary retention, vaginal erosion, dyspareunia, infection, abnormal discharge) complications. Statistical Package for Social Sciences for Windows was used for statistical analyses. For continuous variables Mann-Whitney U test and for categorical variables Chi-square, Fishers exact tests were used. Results: Stress incontinence in groups 1 and 2 were either completely cured or improved in 87.1% and 84.6%, respectively. The question "Would you like to have an operation like this again?" was answered positively by 26 (83.9%) of patients in group 1 and by 22 (84.6%) in group 2. There was no significant difference between two groups for the complication rates occurred within 90-days period. However, there was a significantly higher groin pain persisting more than three weeks in group 1 (38.7%) compared to group 2 patients (7.7%). Conclusions: There was statistically significant increased groin pain in the early period in TOT procedures performed by the residents. However, the complications observed in both groups did not affect the success rate or patient satisfaction

Objetivos: Investigar las complicaciones quirúrgicas postoperatorias y la satisfacción del paciente con la operacion de malla transonbturatriz fuera-adentro realizada por un cirujano experto en comparación con la realizada por residentes en formación. Métodos: Las pacıentes operadas de TOT por un residente bajo supervisión de un adjunto se incluyeron en el grupo 1 (n = 31) y las operadas por el mismo adjunto se incluyeron en el grupo 2 (n = 26). Se compararon los datos demográficos, resultados de la operación, tasas de satisfacción así como las complicaciones intraoperatorias y postoperatorias tempranas (retención urinaria, erosión vaginal, dispareumia, infeccion, flujo anormal). Para el análisis estadístico se utilizó el software SPSS para Windows. Se utilizaron el test de la U de Mann- Whitney para variables continuas y los de Chi cuadrado y Prueba exacta de Fisher para variables categóricas. Resultados: La incontinencia urinaria de esfuerzo en los grupos 1 y 2 fue bien completamente curada, bien mejoró en 87,1% y 84,6%, respectivamente. La pregunta ¿volvería a someterse a la misma operación? fue respondida positivamente por 26 (83,9%) de los pacientes en el grupo 1 y 22 (84,6%) en el grupo 2. No había diferencias estadísticamente significativas entre los grupos en la tasa de complicaciones en los primeros 90 días. Sin embargo, el dolor en la ingle que persistía más de 3 semanas era significativamente mayor en el grupo 1 (38,7%) en comparación con las pacientes del grupo 2 (7,7%). Conclusiones: Hay un aumento estadisticamente significativo del dolor en el muslo en el periodo postoperatorio temprano de las operaciones de TOT realizadas por residentes. Sin embargo, las complicaciones observadas en ambos grupos no afectaron a la tasa de éxitos o a la satisfaccion del paciente

Effect of Temperature of Sodium Hypochlorite on Cyclic Fatigue Resistance of Heat-treated Reciprocating Files.

INTRODUCTION: The aim of this study was to evaluate the effect of different temperatures of sodium hypochlorite (NaOCl) on the cyclic fatigue resistance of the heat-treated file systems. METHODS: The cyclic fatigue resistance of Reciproc 25 (VDW Dental, Munich, Germany), Reciproc Blue R25 (VDW), WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland), WaveOne Gold Primary (Dentsply Maillefer), and One Shape (25.06; Micro Mega, Besançon, France) was tested in the following conditions: control (no immersion), immersion in distilled water (DW) at 37°C ± 1°C, immersion in DW at 60°C ± 1°C, immersion in NaOCl at 37°C ± 1°C, and immersion in NaOCl at 60°C ± 1°C. The immersion period was 5 minutes for all conditions. A stainless steel artificial canal with a curvature of 60° and a 5-mm radius was used. The time to failure and fragment lengths were recorded for each instrument, and data were subjected to statistical analysis. RESULTS: Reciproc Blue showed greater cyclic fatigue resistance in all conditions compared with the other systems (P < .05). Immersion in NaOCl at 60 °C negatively affected all instruments' cyclic fatigue resistance except Reciproc Blue. Immersion in DW at 60 °C increased the cyclic fatigue resistance of Reciproc Blue. Heat-treated files presented higher fatigue resistance than traditional files. CONCLUSIONS: A high temperature of NaOCl affected the cyclic fatigue life of the file systems. Instruments produced with heat treatment presented a longer fatigue life.

Rapid Palatal Expansion with the Keles Keyless Expander.

Rapid palatal expansion (RPE) is commonly used in orthodontic treatment to correct maxillary transverse deficiency, increase arch length, indirectly widen the mandibular arch in some cases, and move the maxilla downward and forward.(1-5) Maxillary transverse deficiency is usually accompanied by posterior crossbite, unless there is constriction or lingual tipping of the mandibular teeth. Posterior crossbite occurs in about 7.1% of American children in the mixed dentition, and it usually does not self-correct as the patient transitions into the permanent dentition.(6) The Keles Keyless Expander(*) (KKE) offers an efficient new method to address the maxillary transverse deficiency issue.

Weyl nodes in periodic structures of superconductors and spin-active materials.

Motivated by recent progress in epitaxial growth of proximity structures of s-wave superconductors (S) and spin-active materials (M), in this paper we show that certain periodic structures of S and M can behave effectively as superconductors with pairs of point nodes, near which the low-energy excitations are Weyl fermions. A simple model, where M is described by a Kronig-Penney potential with both spin-orbit coupling and exchange field, is proposed and solved to obtain the phase diagram of the nodal structure, the spin texture of the Weyl fermions, as well as the zero-energy surface states in the form of open Fermi lines (Fermi arcs). As a second example, a lattice model with alternating layers of S and magnetic Z2 topological insulators is solved. The calculated spectrum confirms previous predictions of Weyl nodes based on the tunnelling Hamiltonian of Dirac electrons. Our results provide further evidence that periodic structures of S and M are well suited for engineering gapless topological superconductors.This article is part of the theme issue 'Andreev bound states'.

Absence of Long-Range Order in a Triangular Spin System with Dipolar Interactions.

The antiferromagnetic Heisenberg model on the triangular lattice is perhaps the best known example of frustrated magnets, but it orders at low temperatures. Recent density matrix renormalization group (DMRG) calculations find that the next nearest neighbor interaction J_{2} enhances the frustration, and it leads to a spin liquid for J_{2}/J_{1}∈(0.08,0.15). In addition, a DMRG study of a dipolar Heisenberg model with longer range interactions gives evidence for a spin liquid at a small dipole tilting angle θ∈[0,10°). In both cases, the putative spin liquid region appears to be small. Here, we show that for the triangular lattice dipolar Heisenberg model, a robust quantum paramagnetic phase exists in a surprisingly wide region, θ∈[0,54°), for dipoles tilted along the lattice diagonal direction. We obtain the phase diagram of the model by functional renormalization group (RG), which treats all magnetic instabilities on equal footing. The quantum paramagnetic phase is characterized by a smooth continuous flow of vertex functions and spin susceptibility down to the lowest RG scale, in contrast to the apparent breakdown of RG flow in phases with stripe or spiral order. Our finding points to a promising direction to search for quantum spin liquids in ultracold dipolar molecules.

Influence of Time and Direction Information on Video Head Impulse Gains.

OBJECTIVE: The objective of this study was to establish which factor leads to a higher vestibulo-ocular reflex (VOR) gain: the timing of the movement or the direction of the movement. For this purpose, healthy volunteers were examined under three conditions: (1) when they were informed about the timing of the head movement; (2) when they were informed about the direction of the head movement; and (3) when they knew both the timing and the direction of the head movement. MATERIALS AND METHODS: This study included data from 19 participants between the ages of 20 and 23 years with no neurological or vestibular ailments. The gains of the video head impulse test (vHIT) were measured under four different conditions and the final control tests. Five subgroups were defined, and the differences in the subgroups were assessed with using several statistical procedures. RESULTS: We found that there were significant differences between all subgroups gains on the right and left head rotations. Nevertheless, nonsignificant differences were found by performing independent samples t-tests and Mann-Whitney U tests between left and right head rotations for the pairwise comparisons of subgroups. Also, analysis of variance (ANOVA) results indicated that vHIT gains for the right and left , respectively). Thus, knowing the timing or direction or both does not affect vHIT gains. CONCLUSION: The results of these experiments revealed that there is no association whatsoever between VOR gain and awareness of the timing or direction of the movement or both.