Nanoclay Promotes Mouse Cranial Bone Regeneration Mainly through Modulating Drug Binding and Sustained Release.

Nanoclay (Nanosilicates, NS) is appearing as an intriguing 2D nanomaterial for bone tissue engineering with multiple proposed functions, e.g., intrinsic osteoinductivity, improving mechanical properties, and drug release capacity. However, the mechanism of NS for in vivo bone regeneration has been hardly defined so far. This knowledge gap will significantly affect the design/application of NS-based biomaterials. To determine the role of NS in osteoblastic differentiation and bone formation, we used the mouse calvarial-derived pre-osteoblasts (MC3T3-E1) and a clinically-relevant mouse cranial bone defect model. Instead of a hydrogel, we prepared biomimetic 3D gelatin nanofibrous scaffolds (GF) and NS-blended composite scaffolds (GF/NS) to determine the essential role of NS in critical low-dose (0.5 µg per scaffold) of BMP2-induced cranial bone regeneration. In contrast to "osteoinductivity", our data indicated that NS could enable single-dose of BMP2, promoting significant osteoblastic differentiation while multiple-dose of BMP2 (without NS) was required to achieve similar efficacy. Moreover, our release study revealed that direct binding to NS in GF scaffolds provided stronger protection to BMP2 and sustained release compared to GF/NS composite scaffolds. Consistently, our in vivo data indicated that only BMP2/NS direct binding treatment was able to repair the large mouse cranial bone defects after 6 weeks of transplantation while neither BMP2, NS alone, nor BMP2 released from GF/NS scaffolds was sufficient to induce significant cranial bone defect repair. Therefore, we concluded that direct nanoclay-drug binding enabled sustained release is the most critical contribution to the significantly improved bone regeneration compared to other possible mechanisms based on our study.

Management of Impacted Third Molars.

Impacted third molars occur in a significant number of patients and often require treatment because of presence of symptoms and/or disease. Management of these teeth typically involves referral to oral and maxillofacial surgeons for diagnosis, treatment planning, and ultimate removal if indicated. Proper diagnosis and treatment planning helps optimize surgical results at each stage of the procedure, and ultimately patient outcomes. Adherence to proper surgical techniques helps minimize risks and complications associated with the procedure. Multiple alternative surgical techniques also exist for uncommon, but potentially complicated, situations that arise with some impacted third molars.

Genome-wide DNA methylation investigation of glucocorticoid exposure within buccal samples.

AIM: Glucocorticoids play a major role in regulating the stress response, and an imbalance of glucocorticoids has been implicated in stress-related disorders. Within mouse models, CpGs across the genome have been shown to be differentially methylated in response to glucocorticoid treatment, and using the Infinium 27K array, it was shown that humans given synthetic glucocorticoids had DNA methylation (DNAm) changes in blood. However, further investigation of the extent to which glucocorticoids affect DNAm across a larger proportion of the genome is needed. METHODS: Buccal samples were collected before and after synthetic glucocorticoid treatment in the context of a dental procedure. This included 30 tooth extraction surgery patients who received 10 mg of dexamethasone. Genome-wide DNAm was assessed with the Infinium HumanMethylationEPIC array. RESULTS: Five CpGs showed genome-wide significant DNAm changes that were >10%. These differentially methylated CpGs were in or nearest the following genes: ZNF438, KLHDC10, miR-544 or CRABP1, DPH5, and WDFY2. Using previously published datasets of human blood gene expression changes following dexamethasone exposure, a significant proportion of genes with false-discovery-rate-adjusted significant CpGs were also differentially expressed. A pathway analysis of the genes with false-discovery-rate-adjusted significant CpGs revealed significant enrichment of olfactory transduction, pentose and glucuronate interconversions, ascorbate and aldarate metabolism, and steroid hormone biosynthesis pathways. CONCLUSION: High-dose synthetic glucocorticoid administration in the setting of a dental procedure was significantly associated with DNAm changes within buccal samples. These findings are consistent with prior findings of an influence of glucocorticoids on DNAm in humans.

Opioid Abuse and Dependence in Those Hospitalized Due to Head and Neck Cancer.

PURPOSE: In the United States, 2.1 million people develop substance abuse disorders that are associated with prescribed opioids. The objective of the present study was to identify the factors associated with opioid abuse and dependence (OAD) in those hospitalized for head and neck cancer (HNC). Although measures are being implementing to reduce opioid prescribing, the use of these drugs in individuals with HNC can be valuable. However, little is known about OAD among this cohort of individuals. MATERIALS AND METHODS: The present study was a retrospective analysis of the Nationwide Inpatient Sample for 2012 to 2014. All patients hospitalized because of any HNC were selected. The OAD prevalence was identified. The patient demographic, hospital, and geographic factors were considered independent variables and OAD was the outcome. Multivariable logistic regression model was used to identify the factors associated with OAD. RESULTS: A total of 92,055 patients were hospitalized because of HNCs. OAD was prevalent in 0.8% of the patients. The OAD rates were greatest in patients with a malignant neoplasm of ill-defined sites within the lip, oral cavity, and pharynx (1.6%). Age 30 to 44 years (odds ratio [OR] 5.19, 95% confidence interval [CI] 2.23 to 12.06; P < .01) and age 45 to 64 years (OR 4.05, 95% CI 2.15 to 7.61; P < .01) were associated with greater odds for OAD compared with age older than 64 years. Black (OR 1.76, 95% CI 1.12 to 2.78; P = .01) and Hispanic (OR 2.20, 95% CI 1.27 to 3.79; P < .01) race/ethnicity were associated with greater odds for OAD compared with white race/ethnicity. Individuals covered by Medicaid (OR 2.08, 95% CI 1.26 to 3.43; P < .01), and those who were uninsured (OR 2.27, 95% CI 1.05 to 4.89; P = .04) were associated with greater odds for OAD compared with those covered by private insurance. An increase in the comorbid burden was associated with increased odds of OAD (OR 1.57, 95% CI 1.47 to 1.68; P < .001). CONCLUSIONS: The present study identified specific anatomic sites where malignant neoplasm was associated with greater odds of OAD. Additionally, the study found that coverage by Medicaid, black and/or Hispanic race/ethnicity, lowest income households, and a greater comorbid burden were associated with greater odds of OAD.

Opioid abuse/dependence among those hospitalized due to periapical abscess.

AIM: Opioid abuse/dependence (OAD) is an emerging public health crisis in the USA. The aim of the present study was to estimate the nationwide prevalence of OAD in those hospitalized due to periapical abscess in the USA. METHODS: The Nationwide Inpatient Sample for 2012-2014 was used. All patients who were hospitalized due to periapical abscess were selected for analysis. In this cohort, OAD was identified and used as the outcome variable. A mix of patient and geographic factors were used as independent variables. The simultaneous association between outcome and independent variables was examined by a multivariable logistic regression model. Clustering of outcomes within hospitals was adjusted. Odds of OAD were computed for all independent variables. RESULTS: During the study period, 30 040 patients were hospitalized due to periapical abscess; 1.5% of these had OAD. Those aged 18-29 years (odds ratio [OR] = 3.69, 95% confidence interval [CI] = 1.76-7.72, P < 0.01) and 30-44 years (OR = 3.19, 95% CI = 1.77-5.76, P < 0.01) were associated with higher odds for OAD compared to those aged 45-64 years. Blacks were associated with lower odds for OAD compared to whites (OR = 0.52, 95% CI = 0.28-0.95, P = 0.03). Those covered by Medicare (OR = 4.08, 95% CI = 1.458-11.44, P = 0.01), Medicaid (OR = 5.86, 95% CI = 2.22-15.47, P < 0.01), and those who were uninsured (OR = 3.68, 95% CI = 1.30-10.45, P = 0.01) were associated with higher odds for OAD compared to those covered by private insurance. The odds of OAD increased with comorbid burden (OR = 1.66, 95% CI = 1.50-1.84, P < 0.01). CONCLUSIONS: High-risk groups that are likely to have OAD were identified among those hospitalized due to periapical abscess.

Impact of Periapical Abscess on Infectious Complications in Patients Undergoing Extracorporeal Circulation Auxiliary to Open-Heart Surgical Procedures.

OBJECTIVE: Extracorporeal circulation auxiliary to open-heart surgeries (ECAOHS) may exert nonphysiological stresses on periapical abscessed tissues leading to hematogenous spread of microbes. The aim of this report was to estimate risk of postoperative infectious complications in patients with periapical abscesses and undergoing ECAOHS. METHODS: A retrospective analysis of Nationwide Inpatient Sample (years 2009 and 2010) was conducted. All patients (aged 19 to 65 years) who underwent ECAOHS were selected. International Classification of Diseases-9-Clinical Modification codes were used to identify the presence of periapical abscess and infectious complications. Multivariable logistic regression models were used to examine the associations between the presence of periapical abscess and occurrence of infectious complications. RESULTS: A total of 265,235 patients underwent an ECAOH procedure. Of these, 431 patients had a periapical abscess. Septicemia developed in 16% of those with periapical abscess (compared with 4.2% in those without periapical abscess). Those with periapical abscess had higher rates of any of the infectious complications when compared with those without periapical abscess (30.2% vs 11.6%, respectively). After adjustment for multiple confounders, those with periapical abscess were associated with higher odds for developing septicemia (odds ratio = 2.51, 95% confidence interval = 1.06-5.91, P = .04) and any of the infectious complications (odds ratio = 2.23, 95% confidence interval = 1.08-4.59, P = .03) when compared with those who did not have periapical abscess. CONCLUSIONS: Those with periapical abscess are associated with higher odds for infectious complications when compared with those without periapical abscess.

A Review of Dental Anatomy and Dental Injury Associated With Anesthesia.

Dental injury during airway management is a common complication encountered during the administration of general anesthesia. This article gives an overview of the frequency of dental injuries, dental anatomy, conditions that increase the risk of dental injury, and mechanism of injury, as well as discusses injury management and avoidance of dental trauma. Although this article does not encompass all situations and variables, it covers these topics in a useful and easily remembered manner that the anesthetist can easily incorporate into practice.

Maxillomandibular Fixation and Anesthesia Management.

Maxillomandibular fixation (MMF) is a frequent issue encountered during the administration of general anesthesia. This article aims to give an overview of MMF from a surgical perspective, complications that can arise from MMF, anesthesia management strategies in MMF cases, and perhaps most importantly, an overview of how to release a patient from MMF in an emergency. Although not encompassing all situations and variables, these topics are covered in a manner that can be easily incorporated into the anesthetist's practice.

Use of Intraoperative Navigation for Minimally Invasive Retrieval of a Broken Dental Needle.

This report describes a case of needle breakage during an inferior alveolar nerve block to perform a restorative dental procedure on a 13-year-old patient. The needle was removed in a minimally invasive fashion using a Medtronic StealthStation S7 surgical navigation system and custom interocclusal splint to allow for stable, identically repeatable positioning of the mandible. This report adds another example of the utility of image-guided surgery for the removal of foreign bodies from the head and neck region in a minimally invasive fashion.