Merrillpetterson6649

STATEMENT OF PROBLEM Tooth preparations for ceramic crowns require precision and accuracy, which may be influenced by the choice of dental handpiece. However, comparisons of the accuracy of tooth preparations made with traditional air-turbine handpieces and electric handpieces are lacking. PURPOSE The purpose of this in vitro study was to evaluate operator preferences and tooth preparation performance by using electric and air-turbine handpieces with self-reported preferences, sound levels, surface roughness, and the fit of the crown produced. MATERIAL AND METHODS Twenty dentists were asked to use the air-turbine or the electric handpiece. Feedback on the noise, weight, feel of grip, flexibility, and tooth preparation in general was scored according to a visual analog scale (VAS). Additionally, the dentists were asked to complete a questionnaire on their handpiece preference. The noise of the 2 handpieces was measured by using a precision sound level meter. The surface roughness of 10 teeth was measured by usair-turbine or electric handpiece. STATEMENT OF PROBLEM The release of titanium (Ti) particles from the surface of endosseous dental implants is not well understood. PURPOSE The purpose of this in vitro study was to evaluate the effect of thermocycling on the surface texture and release of Ti particles from the surface of dental implants. MATERIAL AND METHODS Three MSI dental implants and 3 Ti alloy (Ti6Al4V) plates were divided into 6 subgroups (n=3). Specimens in each group were subjected to 0 (control group), 100, 200, 500, 1000, and 2000 thermocycles. After each cycling process, artificial saliva was collected, and the concentrations of released Ti particles were quantified by inductively coupled plasma-mass spectrophotometry (ICP-MS). The surfaces of the dental implants and Ti plates were evaluated before and after thermocycling by scanning electron microscopy (SEM), and SEM images were analyzed by using the ImageJ software. Data were analyzed by mixed-model ANOVA and post hoc Tukey tests (α=.05). RESULTS The greatest Ti release was seen after 2000 thermocycles. After increasing the number of cycles, additional Ti particles were released. SEM images of the surfaces of the dental implants and Ti plates displayed significant changes in surface texture. CONCLUSIONS Thermocycling continuously removed the protective TiO2 layer on the surface of dental implants, resulting in the release of Ti particles. The surface treatment and texture did not affect the release of Ti particles. STATEMENT OF PROBLEM Although numerous studies have been performed on the accuracy of intraoral scanners, determining the clinical significance of the results is problematic. PURPOSE The purpose of this in vitro study was to evaluate the trueness and precision of 4 intraoral optical scanners (IOSs) on a 6-implant model and provide a method to help determine clinical significance. MATERIAL AND METHODS A polymer mandibular edentulous model with 6 hexagonal scan bodies (Ritter) was fabricated, and a control scan was made by using an industrial laser line probe (FARO Edge HD Arm). Four IOSs (True Definition, TRIOS, CEREC Omnicam, Emerald Scanner) were used to scan the same model 5 times the 20 standard tessellation language (STL) files were individually imported to a 3D inspection software program (Geomagic Control X) and superimposed over the computer-aided design (CAD) control scan. The tolerance was set at a limit of ±0.01 mm. RESULTS None of the tested scanners were true even 10% of the time at the ±0.01-mm tolerance, and the Emerald scanner was true less than 5% of the time. Within scanners, results were precise, showing variations of no more than 2% over repeated scans. When a ±0.05-mm tolerance was selected, the percentage within tolerance increased dramatically. This made the performance of the scanners to appear better but obscured valuable information. The 3D color map was the best method for understanding the data. The color maps showed how much was within tolerance and, equally important, the amount and direction of out of tolerance, providing an easily understandable qualitative and quantitative image. CONCLUSIONS No statistical or clinical differences were found among the scanners tested. The 3D map was the best method for observing the data. Grief is the natural response to the death of a loved one and is encountered frequently in clinical practice with the elderly; it can also precede the death. Knowledge about four distinct forms of grief can aid clinicians with the conceptualization of grief, and the assessment and care of grievers. First, predeath grief is experienced by many caregivers of terminally ill patients. Second, acute grief arises immediately after the death of a loved one; and third, this normally evolves to a permanent state of integrated grief after a process of adaptation. Finally, failure of adaptation results in Prolonged Grief Disorder (PGD) which has been recently included in ICD-11. The hallmark feature of PGD is intense longing for the deceased or persistent preoccupation with the deceased that lasts longer than 6 months after the death. Validated instruments are available to assist practitioners with assessment of predeath grief and screening for PGD, thereby enabling identification of patients in need of additional support. Increased risks of morbidity and mortality following bereavement are important health issues for clinicians to be aware of. All grievers can benefit from support focused on understanding their grief, managing emotional pain, thinking about the future, strengthening their relationships, telling the story of the death, learning to live with reminders of the deceased, and connecting with memories. A short-term evidence-based intervention for PGD is based upon these seven themes and is efficacious in the elderly. Caregivers of the terminally ill benefit from psychological support that validates and normalizes their grief experiences and helps them recognize and accept their losses. OBJECTIVE To analyze the risk of megestrol, a glucocorticoid and progesterone receptor agonist used to enhance appetite, on the development of a new psychiatric diagnosis. DESIGN AND PARTICIPANTS Deidentified data of megestrol (n = 706) and propensity score-matched comparison (age, gender, and body mass index) patients (n = 2,118) from January 1, 2001 to June 30, 2018 were obtained from the UT Southwestern patient database. Data were analyzed using a series of conditional binary logistic regressions controlling for comorbidities, pre-existing psychiatric disorders, and number of patient encounters. SETTING A large academic medical center database of megestrol-treated patients and matched comparison patients was used. BMS-1166 mouse MEASUREMENTS AND RESULTS The regression model showed that megestrol was significantly associated with developing a new psychiatric diagnosis (B = 1.28, Wald χ21 = 83.12, odds ratio [OR] = 3.60, p less then 0.001). In subgroup analyses, development of cognitive (B = 2.42, Wald χ21 = 16.09, OR = 11.