Interdigitated electrodes-based Au-MoS2hybrid gas sensor for sensing toxic CO and NH3gases at room temperature.

In the quest to create effective sensors that operate at room temperature, consume less power and maintain their stability over time for detecting toxic gases in the environment, molybdenum disulfide (MoS2) and MoS2-based hybrids have emerged as potent materials. In this context, the current work describes the fabrication of Au-MoS2hybrid gas sensor fabricated on gold interdigitated electrodes (GIEs) for sensing harmful CO and NH3gases at room temperature. The GIEs-based Au-MoS2hybrid sensors are fabricated by decorating MoS2nanoflowers (MNF) with varying size of Au nanoparticles using an inert gas evaporation technique. It is observed that by varying the size of Au nanoparticles, the crystallinity gets modified, as confirmed by x-ray diffraction and Micro-Raman spectroscopy (µRS). The gas sensing measurements revealed that the best sensing response is found from the Au-MoS2hybrid (with an average particle size of 10 nm). This particular hybrid shows a 79% response to CO exposure and a 69% response to NH3exposure. The measurements are about 3.5 and 5 times higher than the bare MoS2when exposed to CO and NH3at room temperature, respectively. This enhancement in sensing response is attributed to the modified interfacial interaction between the Au nanoparticles and MNF gets improved, which leads to the formation of a Schottky barrier, as confirmed using x-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy analysis. This enables the development of efficient gas sensors that respond quickly to changes in the gas around them.

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS2-TiO2heterostructures for electrochemical and photocatalytic applications.

Two-dimensional (2D)/one dimensionsal (1D)-MoS2/TiO2heterostructures have proven to be potent for photocatalytic applications. Enhancement of a heterostructure's photocatalytic activity may be influenced by the accumulation of strain at the interface, which affects the interfacial interaction. Keeping this in mind, the present paper reports strain-accumulated interfacial modification of 2D/1D-MoS2/TiO2heterostructures for the enhancement of photocatalytic activity. Two different synthesis methods, namely the hydrothermal and chemical vapor deposition (CVD) methods, are used for the growth of MoS2on TiO2nanostructures. Micro-Raman spectroscopy reveals that strain is accumulated at the interface of the growth of the MoS2over the TiO2nanostructures. It is further revealed that the MoS2/TiO2heterostructure synthesized by the CVD method induces compressive strain. Also, the heterostructure synthesized by the hydrothermal method induces tensile strain that modifies the charge separation at the interface, which is further confirmed by x-ray photoelectron spectroscopy (XPS). Moreover, ultraviolet photoelectron spectroscopy (UPS) reveals upward band-bending in the MoS2/TiO2heterostructure synthesized by the hydrothermal method. Similarly, the heterostructure synthesized by the CVD method shows downward band-bending that leads to improved charge separation at the interface. The modified interfaces of the heterostructures are further studied for electrochemical measurements using cyclic voltammetry (CV) and photocatalytic activity by degradation of a model compound.

Comprehensive facial injury (CFI) score as a predictor of surgical time, length of hospital stay, and head injury? Our experience at level I trauma center.

Purpose: The present study aimed to evaluate the statistical significance of comprehensive facial injury (CFI) score concerning total surgical time (ST), length of hospital stay (LHS), and head injury in maxillofacial trauma patients. Methods: This retrospective observational study included 288 patients having maxillofacial injuries with or without associated head injury. CFI score was calculated for each of them. One-way ANOVA and Kruskal-Wallis H-test were used to compare ST (minutes), LHS (days), and Glasgow Coma Scale (GCS) score among the CFI score clusters. Head injury among the CFI score clusters was compared using Fisher's exact test. The level of statistical significance was set at P < 0.05. Results: Of total 288 cases (males: 83.68%, females: 16.31%, mean age: 30 ± 15.92 years), road traffic accidents accounted for 76.0% of admissions. A definitive approach (open reduction and internal fixation) was used in 26.38% of cases. Statistically significant association of CFI score was obtained with ST and LHS in high-dependency unit (P < 0.001). Posttraumatic head injury was seen in 21.25% of cases. A significant association of CFI score with GCS score (P = 0.032) and with head injury (P = 0.019) was found. Conclusion: CFI score is a comprehensive yet simple scale to assess ST and LHS. A strong correlation established between CFI score and these variables further validate its reliability as a perfect tool for communication of the maxillofacial morbidity and in making a treatment protocol, although its predictive ability for associated head injuries needs to be studied further.

Third molar impaction in different facial types and mandibular length: A cross-sectional study.

BACKGROUND: The etiology of mandibular third molar impaction is proposed to be mainly due to inadequate space between the distal of the second mandibular molar and the anterior border of the ramus of the mandible. This study was aimed to assess whether an association exists between different facial types and mandibular length to impaction of mandibular third molars. MATERIALS AND METHODS: The study consisted of 170 patients who were assessed for facial type clinically based on facial index and mandibular length radiographically on lateral cephalogram. The impaction status was determined clinically and radiographically on orthopantomogram. The facial type was categorized as euryprosopic (broad face), mesoprosopic (normal facial type), leptoprosopic (long face), hypereuryprosopic (extra broad face), and hyperleptoprosopic (extra long face). RESULTS: Of 170 patients, 18.8% of cases were with hypereuryprosopic profile, 33.5% of cases with euryprosopic profile, 24.7% with mesoprosopic profile, 21.8% with leptoprosopic, and 1.2% with hyperleptoprosopic profile were found. Nearly 42.2% of cases with hypereuryprosopic profile, 52.6% of cases with euryprosopic profile, 53.6% cases of mesoprosopic profile, and 60.3% cases of hyperleptoprosopic and leptoprosopic profile had impacted mandibular third molars. As for mandibular length assessment, 66% cases of short mandibular length, 64.5% cases of normal mandibular length, and 27.9% cases of long mandibular length had impaction. CONCLUSION: Within the limitations of the study, it was concluded that, though a higher incidence of impacted third molar was noted in patients with long facial pattern, no significant difference could be established among facial types and their association with impacted mandibular third molars. A significant association was noted between mandibular length and impaction.

Impact of COVID-19 on oral and maxillofacial surgery practice in India: A national survey.

STUDY DESIGN: The Coronavirus disease-19 (COVID-19) pandemic has disrupted oral and maxillofacial (OMF) surgeons' practice globally. We implemented a cross-sectional, questionnaire-based survey among the OMF surgeons of India. OBJECTIVE: The objectives of the study were (1) gathering data among the maxillofacial surgeons in terms of their occupational exposure and access to adequate personal protective equipment (PPE) and (2) to estimate how the COVID-19 pandemic has affected the practice of OMF surgeons in India. MATERIALS AND METHODS: Complete responses of 178 OMF surgeons were included in the study. Descriptive and analytic statistics were computed. The level of statistical significance was set at P < 0.05. Binary logistic regression models were created to assess the predictors of the impact of the COVID-19. RESULTS: Out of the 178 respondents of the study, most (37.1%) were following their hospital's guidelines. Most had access to adequate PPE (89.9%), whereas 93.8% had COVID-19 testing available. One hundred and thirty-three (74.7%) surgeons were involved in teleconsultation. Ninety-two (51.7%) and 166 (93.3%) were involved in elective surgery and emergency surgeries, respectively. Median outpatient department cases and number of surgeries done per week reduced by 73.9% and 66.7% (P < 0.001), respectively. Most surgeons (86%) experienced that cost of treatment had increased during the COVID. Over 75% were afraid to get infected with COVID, whereas 44.9% were anxious to lose the income. More than 56% of the OMF surgeons reported a fall in income and 94% reported decreased productivity in academic research. Most surgeons (93.8%) believed that COVID had a positive impact on human behavior in terms of hand hygiene. CONCLUSION: The impact of COVID-19 among OMF surgeons has adversely affected clinical practice, personal lives, and academic productivity and has catalyzed an exponential increase of telemedicine. Future surveys should capture the long-term impact of COVID-19.

Traumatic Pseudoaneurysm: A Life-Threatening Complication After Surgical Extraction of Impacted Maxillary Third Molar.

Pseudoaneurysms are rare lesions secondary to blunt or penetrating trauma, temporomandibular joint surgery, or orthognathic surgery. They are usually produced by arterial breach leading to extravasation of blood. The compressed perivascular tissue forms the wall of aneurysmal sac. This sac gradually expands and can be damaged. Nonsurgical interventions are the treatment of choice for pseudoaneurysms. In the case reported here, emergent endovascular injection of acrylic glue was successful in the treatment of a pseudoaneurysm from a branch of the internal maxillary artery secondary to surgical extraction of impacted maxillary third molar.