Category: Nevin Manimala

Gen Dent. 2021 May-Jun;69(3):46-51.

ABSTRACT

This study aimed to compare the effects of different combinations of adhesive bases and restorative materials on the fracture strength and mode of maxillary premolars with mesio-occlusodistal (MOD) cavities after mineral trioxide aggregate (MTA) pulpotomy. Ninety-six extracted human maxillary premolars were divided into 8 groups (n = 12). Group 1 (negative control) consisted of intact teeth. In the other teeth, MOD and endodontic access cavities were prepared, and a layer of MTA was placed. Group 2 was left unrestored as the positive control. Group 3 was restored with a glass ionomer cement (GIC) base and amalgam. The remaining groups were restored with a microhybrid composite after application of different bases: 4, resin-modified GIC (RMGIC); 5, zirconia-reinforced GIC (ZRGIC); 6, self-adhesive flowable composite (SAFC); 7, self-adhesive resin cement (SARC); and 8, short fiber-reinforced composite (SFRC). After fracture strength testing via continuous compressive axial loading, the fracture mode was classified as restorable or unrestorable. Data were analyzed using 1-way analysis of variance and post hoc Tamhane tests (P < 0.05). The fracture strength of the negative control group was significantly higher than that of all other groups (P < 0.001). The fracture strengths of groups 2 and 3 were not significantly different (P > 0.05) from each other but were significantly lower (P = 0.002) than those of all composite-restored groups. Group 8 showed a significantly greater fracture strength than group 4 (P < 0.001). Unlike GIC/amalgam, all of the base/composite restoration groups partly restored the strength of pulpotomized premolars. Although their fracture strengths were statistically similar, the fracture modes were more favorable in groups with SAFC or SARC bases than in groups with RMGIC or ZRGIC bases. The SFRC/composite specimens revealed advantages in both fracture strength and fracture mode compared to RMGIC/composite specimens.

PMID:33908878

Gen Dent. 2021 May-Jun;69(3):52-56.

ABSTRACT

This study evaluated the effect of fiber post customization and laser application on the results of pull-out tests in endodontically treated teeth. Forty-eight bovine incisors were stored in aqueous 2% formaldehyde (pH 7.0) for 30 days. At the end of the storage period, the incisors were scraped with No. 11/12 periodontal curettes, rinsed with water and sodium bicarbonate, and stored in 0.9% saline solution for 7 days. Roots with similar shape and dimensions were selected and sectioned to a standard 17-mm length. Root canals were prepared and filled to a depth of 12 mm. The roots were divided into 4 groups (n = 12): 1, conventional fiber post and no laser application; 2, customized fiber post and no laser application; 3, conventional fiber post and laser application; and 4, customized fiber post and laser application. After removal of the obturation material for post space preparation, the canals were enlarged, and a laser beam was applied to the roots of teeth in groups 3 and 4 as an auxiliary disinfection procedure. After cementation of the posts, a pull-out test was performed using an axial tensile load at 0.5 mm/min in a universal testing machine. Analysis of variance and the Tukey test were used for statistical analysis of the results. The mean (SD) maximum tensile force was 10.18 (4.73) kgf in group 1, 38.89 (6.49) kgf in group 2, 27.74 (10.07) kgf in group 3, and 38.92 (6.89) kgf in group 4. These values were significantly higher in groups 2 and 4 than in group 1 (P < 0.05). The customization of fiber posts used for the restoration of pulpless teeth resulted in significantly (P < 0.05) greater pull-out test values, a thinner cement layer, and improved retention.

PMID:33908879

Pediatr Pulmonol. 2021 Apr 27. doi: 10.1002/ppul.25413. Online ahead of print.

ABSTRACT

INTRODUCTION: Coronavirus disease 2019 (COVID-19) emerged in China, leading to worldwide morbidity and mortality, including depression and anxiety. As the pandemic spread throughout Italy, mental health concerns increased for people with cystic fibrosis (pwCF), who are at greater risk. The aim was to pilot a Telehealth Psychological Support Intervention for pwCF and caregivers to reduce stress, depression, and anxiety during the lockdown in Italy in March 2020.

METHODS: This intervention utilized cognitive behavioral skills (e.g., cognitive reframing). Participants included 16 pwCF and 14 parents, who completed four individual telehealth sessions with a psychologist. Stress ratings, Patient Health Questionnaire and General Anxiety Disorder, PHQ-8 and GAD-7, were completed, in addition to Feasibility and Satisfaction ratings.

RESULTS: Ratings of stress significantly decreased from pre- to post-testing for pwCF (paired t(14) = -4.06, p < .01) and parents (paired t = -5.2, p < .001). A large percentage of both groups scored in the clinical range for depression and anxiety at baseline (pwCF: depression/anxiety = 71%; parents: depression = 57%; anxiety = 79%); a large proportion (20%-40%) reported moderate to severe symptomatology. Significant reductions in depression for pwCF were found (pre: M = 8.0 to post: M = 4.7; paired t(14) = 2.8, p < .05) but not anxiety (pre: M = 6.9 to post: M = 5.6, t(14) = 1.2, p = NS-non-significant). Parental depression decreased for parents (pre: M = 6.4 to post: M = 5.1, t(14) = -2.5, p < .05), but not anxiety (pre: M = 8.1 to post: M = 7.9, t(14) = -0.2, p = NS). Feasibility and Satisfaction were positive.

CONCLUSION: This telehealth intervention yielded reductions in stress and depression for participants. Anxiety did not significantly decrease, possibly because COVID was ongoing. This feasible, satisfactory intervention was effective for improving mental health.

PMID:33905614 | DOI:10.1002/ppul.25413

J Perinat Med. 2021 Apr 27. doi: 10.1515/jpm-2021-0069. Online ahead of print.

ABSTRACT

OBJECTIVES: To explore attitudes to COVID-19 vaccination among perinatal women.

METHODS: A nationwide online, cross-sectional survey was conducted in Qatar from 15th October 2020 to 15th November 2020 with voluntary participation open to all adult residents. Of the respondents, the population group for this study comprised the 341 pregnant and breastfeeding participants. The survey utilized a composite questionnaire incorporating a validated instrument to measure vaccine attitudes. The responses were recorded and analysed with statistical analysis being performed with SPSS software. Outcome measures included intentions towards vaccination and potential factors influencing vaccine hesitancy (contextual factors, vaccine specific concerns and group/individual influences).

RESULTS: Perinatal women exhibited a vaccine hesitancy rate of 25% towards COVID-19 immunisation. The main concerns of the group were of infection risks and main factor determining vaccine hesitancy was of vaccine specific safety concerns. Previous vaccine “acceptors” showed vaccine hesitancy to COVID-19 immunisation. A third of the group cited non availability of the vaccine as a concern.

CONCLUSIONS: COVID-19 vaccine trials amongst pregnant and lactating women have lagged behind those for general populations and this has compounded concerns around safety in this special group. Perinatal women constitute a vulnerable group and play an important role in vaccination of wider family members. This study highlights the need for trials and data for COVID-19 vaccine in this group to be able to achieve appreciable numbers needed for herd immunity and ultimately control of the pandemic.

PMID:33905622 | DOI:10.1515/jpm-2021-0069

Nurse Educ. 2021 May-Jun 01;46(3):138-139. doi: 10.1097/NNE.0000000000000884.

NO ABSTRACT

PMID:33905636 | DOI:10.1097/NNE.0000000000000884

Med Phys. 2021 Apr 27. doi: 10.1002/mp.14902. Online ahead of print.

ABSTRACT

PURPOSE: Despite the widespread availability of in-treatment room cone beam computed tomography (CBCT) imaging, due to the lack of reliable segmentation methods, CBCT is only used for gross set up corrections in lung radiotherapies. Accurate and reliable auto-segmentation tools could potentiate volumetric response assessment and geometry-guided adaptive radiation therapies. Therefore, we developed a new deep learning CBCT lung tumor segmentation method.

METHODS: The key idea of our approach called cross modality educed distillation (CMEDL) is to use magnetic resonance imaging (MRI) to guide a CBCT segmentation network training to extract more informative features during training. We accomplish this by training an end-to-end network comprised of unpaired domain adaptation (UDA) and cross-domain segmentation distillation networks (SDN) using unpaired CBCT and MRI datasets. UDA approach uses CBCT and MRI that are not aligned and may arise from different sets of patients. The UDA network synthesizes pseudo MRI from CBCT images. The SDN consists of teacher MRI and student CBCT segmentation networks. Feature distillation regularizes the student network to extract CBCT features that match the statistical distribution of MRI features extracted by the teacher network and obtain better differentiation of tumor from background. The UDA network was implemented with a cycleGAN improved with contextual losses separately on Unet and dense fully convolutional segmentation networks (DenseFCN). Performance comparisons were done against CBCT only using 2D and 3D networks. We also compared against an alternative framework that used UDA with MR segmentation network, whereby segmentation was done on the synthesized pseudo MRI representation. All networks were trained with 216 weekly CBCTs and 82 T2-weighted turbo spin echo MRI acquired from different patient cohorts. Validation was done on 20 weekly CBCTs from patients not used in training. Independent testing was done on 38 weekly CBCTs from patients not used in training or validation. Segmentation accuracy was measured using surface Dice similarity coefficient (SDSC) and Hausdroff distance at 95th percentile (HD95) metrics.

RESULTS: The CMEDL approach significantly improved (p < 0.001) the accuracy of both Unet (SDSC of 0.83 ± 0.08; HD95 of 7.69 ± 7.86mm) and DenseFCN (SDSC of 0.75 ± 0.13; HD95 of 11.42 ± 9.87mm) over CBCT only 2DUnet (SDSC of 0.69 ± 0.11; HD95 of 21.70 ± 16.34mm), 3D Unet (SDSC of 0.72 ± 0.20; HD95 15.01 ± 12.98mm), and DenseFCN (SDSC of 0.66 ± 0.15; HD95 of 22.15 ± 17.19mm) networks. The alternate framework using UDA with the MRI network was also more accurate than the CBCT only methods but less accurate the CMEDL approach. Limitation includes analysis on a modest sized dataset.

CONCLUSIONS: Our results demonstrate feasibility of the introduced CMEDL approach to produce reasonably accurate lung cancer segmentation from CBCT images. Further validation on larger datasets is necessary for clinical translation.

PMID:33905558 | DOI:10.1002/mp.14902

Clin Anat. 2021 Apr 27. doi: 10.1002/ca.23743. Online ahead of print.

ABSTRACT

INTRODUCTION: The cyamella is a rare, generally asymptomatic, knee sesamoid bone located in the proximal tendon of the popliteal muscle. Only two studies have investigated cyamella presence/absence in humans, putting ossified prevalence rates at 0.57-1.8%. We aim to 1) determine cyamella prevalence in a Korean population, 2) examine coincident development of the cyamella and fabella, and 3) perform a systematic review and meta-analysis on the cyamella in humans.

MATERIALS AND METHODS: Medical computed tomography scans of 106 individuals were reviewed. A systematic review and meta-analysis were performed following PRISMA guidelines.

RESULTS: Cyamellae were found in 3/212 knees (1.4%), and presence/absence was uncorrelated to height, age, and sex. The cyamella was not found coincidentally with the fabella, although the statistical power was low. Our systematic review/meta-analysis revealed cyamellae were generally asymptomatic and ossification could occur at 14 years. Cyamellae were equally likely to be found in both sexes, knees, one or both knees, and there appeared to be no global variation in prevalence rates. Cyamellae were found in three distinct locations.

CONCLUSIONS: There is little support for the role of intrinsic genetic and/or environmental factors in cyamella development in humans. However, the apparent phylogenetic signal in Primates suggests genetics plays a role in cyamella development. We propose a cyamella classification system based on cyamella location (Class I, popliteal sulcus; Class II, tibial condyle; Class III, fibular head) and hypothesize locations may correspond to distinct developmental pathways, and cyamella function may vary with location. This article is protected by copyright. All rights reserved.

PMID:33905585 | DOI:10.1002/ca.23743

Trop Med Int Health. 2021 Apr 27. doi: 10.1111/tmi.13595. Online ahead of print.

ABSTRACT

OBJECTIVE: With scale-up of antiretroviral therapy (ART) children, treatment failure and switch to subsequent ART regimens is common. Our objectives were to evaluate switching practices and identify factors associated among children and adolescents failing their first-line ART.

METHODS: A facility-based survey study was conducted in a cohort of children living with HIV experiencing virological failure (VF) at the Essos Hospital Centre of Yaounde, Cameroon. Data were collected using a standard questionnaire and key variables were: (a) VF defined as viral load (VL) >1,000 copies/mL, (b) rate of switch to second-line, and (c) reason(s) for switching ART. Odds ratio (OR) with 95% confidence interval (CI) was used to assess the association between study variables, and p<0.05 was considered statistically significant.

RESULTS: A total of 106 children experiencing VF were enrolled: median age was 8 [interquartile range (IQR): 3-15] years; 60.38% were boys and 39.62% were orphans of one/both parents. A proportion of 69% were at the WHO clinical stage III/IV and 13.21% had were experiencing immunological failure (CD4<200 cells/mm³ ). The median duration on first-line ART was 36 [IQR: 7-157] months prior to detecting VF, and the rate of switch to second-line ART was 70.75% (75/106). Delay in switching ART after a confirmed VF was 11 [IQR: 7-16] months. After switch to second-line ART, the median time to achieve undetectable VL (<40 copies/mL) was 14 [IQR: 9-21] months. Multivariate analysis revealed that only children with viral rebound (aOR=0.09; 95%CI=0.03-0.24) were less likely to be switched. Of note, being orphaned (aOR=0.35 (0.11-1.11), biological sex (aOR=1.77, IC=0.60-5.29), and immune status (aOR=0.19 IC=0.03-1.31, 0.09) had no significant effect on switching to second-line ART.

CONCLUSION: In this pediatric population experiencing VF after about 3-4 years from ART initiation, the majority are switched to second-line ART after a delay of almost one year. Delayed switch to second-line was driven essentially by viral rebound, underscoring the need for close viral monitoring.

PMID:33905593 | DOI:10.1111/tmi.13595

J Dent Educ. 2021 Apr 27. doi: 10.1002/jdd.12622. Online ahead of print.

ABSTRACT

PURPOSE: To examine the integration of social determinants of health (SDH) in the US Advanced Education in General Dentistry (AEGD) and General Practice Residency (GPR) programs.

METHODS: This study used an explanatory sequential mixed-methods approach. A 46-question survey was sent to all 265 AEGD and GPR programs in February 2019. Descriptive statistics and multivariate analyses were conducted to identify factors influencing SDH curricular inclusion. A convenience sample of program directors (PDs) was interviewed between June and December 2019. Through content analysis, themes and subthemes were identified.

RESULTS: Of the 265 AEGD and GPR PDs, 111 completed the survey (42% response rate). Almost three-quarters of PDs (72%) agreed that it was important for residents to understand basic SDH concepts. However, programs lacked eight of the 10 surveyed SDH subtopics. The odds of teaching five or more SDH subtopics were 0.09 (95% CI: 0.02-0.41) for programs with none-to-minimal levels of SDH integration in their clinical settings compared to close-to-fully integrated ones. Coding of PD interviews (N = 13) identified five major themes: 1. influences to integrate SDH, 2. training strategies, outcomes, and outputs, 3. reasons for training strategies, 4. barriers and solutions, and 5. future integration goals. Most PDs cited delivering SDH content during patient care and reported time and organizational culture being barriers to more curricular inclusion.

CONCLUSIONS: AEGD and GPR curricula are deficient in SDH content and risk underpreparing residents for caring for the underserved. PDs and organizational leaders must prioritize SDH inclusion in order to train dentists for integrated person-centered care.

PMID:33905531 | DOI:10.1002/jdd.12622

Pain Med. 2021 Apr 27:pnab154. doi: 10.1093/pm/pnab154. Online ahead of print.

ABSTRACT

OBJECTIVE: Musculoskeletal (MSK) pain conditions are a leading cause of pain and disability internationally and a common reason to seek health care. Accurate prediction of recurrence for health care seeking due to MSK conditions could allow for better tailoring of treatment. The aim of this project was to characterize patterns of recurrent physical therapy seeking for MSK pain conditions and to develop a preliminary prediction model to identify those at increased risk for recurrent care seeking.

DESIGN: Retrospective cohort.

SETTING: Ambulatory care.

SUBJECTS: Patients (n = 578,461) seeking outpatient physical therapy (United States).

METHODS: Potential predictor variables were extracted from the electronic medical record and patients were placed into three different recurrent care categories. Logistic regression models identified individual predictors of recurrent care seeking and Least Absolute Shrinkage and Selection Operator (LASSO) developed multivariate prediction models.

RESULTS: Accuracy of models for different definitions of recurrent care ranged from 0.59 – 0.64 (c-statistic) and individual predictors were identified from multivariate models. Predictors of increased risk for recurrent care included: worker’s compensation and Medicare insurance, comorbid arthritis, post-operative at time of first episode, age range from 44 -64 years, and reporting night sweats/night pain. Predictors of decreased risk for recurrent care included: lumbar pain, chronic injury, neck pain, pregnancy, age range from 25-44 years, and smoking.

CONCLUSION: This analysis identified a preliminary predictive model for recurrence of care seeking of physical therapy, but model accuracy needs to improve to better guide clinical decision making.

PMID:33905514 | DOI:10.1093/pm/pnab154