4823 research outputs found
Sort by
A Study in Fresh Human Cadaver Heads Examining the Incidence of Maxillary Sinus Membrane Perforation During Crestal Sinus Elevation Comparing Osteotomes to Osseodensification Drills.
Full text linkIntroduction: Crestal sinus membrane elevation technique is a surgical procedure that helps gain vertical bone volume when there is a pneumatization of the maxillary sinus. Due to some visual limitations inherent to the procedure, the potential for maxillary sinus membrane perforations and subsequent complications exists. A crestal sinus lift using osseodensification drills has been used lately but there are not many studies to support the protocol. The primary aim of the study is to evaluate the incidence of sinus membrane perforation during Osseodensification compared to the incidence of bone added crestal sinus elevation using osteotomes (BAOSFE). The secondary aim is to observe when the perforation occurs, during instrumentation, bone placement or implant placement.
Methods: A total of 20 sinuses of 10 fresh human cadaver heads were used in a split mouth design. One side received BAOSFE (control group), and the other side received Osseodensification lift (test group). Presurgical cone beam computed tomography (CBCT) scans were taken to evaluate the available subantral bone height and to provide a reference point to standardize the amount of elevation. All sinuses were planned for 5 mm sinus lift with simultaneous implant placement. The perforation of the membrane was recorded using a direct camera video recording on skull-less human cadaver heads. The integrity or the disruption of the maxillary sinus membrane assessed and recorded as the membrane perforation for statistical comparisons. McNemar’s test was used for statistical analysis.
Results: The rate of sinus membrane perforation in the BAOSFE was 40% and the rate for osseodensification group was 50%. There was no statistical difference between both groups (p=0.564). When evaluating the timing of the perforation, most of the perforations happened at the time of implant placement, 20% in the control group and 40% in the test groups (p=0.480). Meanwhile, 10 % of the sinuses perforated at the time of drilling in the test site compared to 20% in the control group with no significant difference (p= 0.317). No perforation was noted at the time of bone graft placement. Conclusion: No significant difference was found between both groups in the incidence of membrane perforation
Maxillary Central Incisor RR in Hispanic and Non-Hispanic White Patients with RME
Full text linkIntroduction: Apical root resorption is one of the most common adverse effects of orthodontic treatment. Forces used during orthodontic tooth movement can cause permanent loss of apical surfaces of teeth and although most reported cases of root resorption are asymptomatic, the process is irreversible and often unpredictable. Thus, it is of clinical interest to investigate which patients may be at greatest risk.
Purpose: This study utilized Cone Beam Computed Tomography (CBCT) to evaluate whether rapid maxillary expansion (RME) in Hispanic patients increased the severity of orthodontically induced apical root resorption.
Materials and Methods: Pre-treatment (T1) and post-treatment (T2) Digital Imaging and Communications in Medicine (DICOM) CBCT images of patients treated at Loma Linda University were imported into OsiriX MD software (version 12.5.2, Pimeo, Bemex Switzerland) for tooth length measurement of maxillary central incisors in sagittal and coronal views. The amounts of root resorption (RR) were calculated and compared between Hispanic and Non-Hispanic White patients treated with and without RME using analysis of covariance (ANCOVA). Spearman Rho correlation tests and Chi-squared analysis were performed to evaluate the relationship between RR and age, gender, and treatment time. All statistical analyses were performed at α = 0.05.
Results: A total of 180 patients were included in this study. Non-Hispanic White patients that underwent rapid maxillary expansion experienced greater amounts of root resorption (p \u3e .05) compared to Hispanic and non-expansion patients. There were no statistically significant differences in overall RR comparing expansion and non-expansion groups, or between ethnicities (p \u3e .05). Age, treatment time, and gender showed no statistically significant correlation with RR (p \u3e .05). Conclusions: Non-Hispanic White patients that underwent rapid maxillary expansion experienced statistically, but not clinically, significant higher levels of root resorption. Age, treatment time and gender had no effect on RR
2022 - 2023 University Catalog
Full text linkThis is a one-year CATALOG, effective beginning Summer Quarter 2022.
Volume 112, Number 1, July 2022https://scholarsrepository.llu.edu/univcatalog/1017/thumbnail.jp
Insufficient Sleep and Onset of Coronary Artery Disease
Full text linkCoronary artery disease (CAD), a consequence of coronary atherosclerosis, is the most common form of cardiovascular disease. Recent research suggests that compared to individuals with normal sleep duration, those with insufficient sleep, defined as short sleep duration (i.e., less than 6 hours per 24-hour period) have a 79% higher risk of developing coronary artery disease. In this review, selected physiological factors (including vascular inflammation, sympathetic overactivity, and increases in blood pressure), behavioral factors (including sedentary behavior and dietary choices), psychological factors (including hostility, fatigue, and major depressive disorder/depressive affect), and sociocultural factors (including race/ethnicity, socioeconomic status, and health literacy) were examined as they result from insufficient sleep and, downstream, to the onset of CAD. Based on the empirical literature published to date, a comprehensive model of CAD risk factors and the role of insufficient sleep is offered to highlight potential areas for new research. This review also proposes clinical implications including the development of more targeted assessment factors related to insufficient sleep and CAD onset, as well as the development of multifactorial treatment recommendations for those patients demonstrating risk factors (including insufficient sleep) to prevent CAD onset
The Design, Prototype, and Testing of a Robotic Prosthetic Leg
Full text linkSince antiquity, health professionals have sought ways to provide and improve prosthetic devices to ease the suffering of those living with limb loss. Mid-century modern engineering techniques, in part, developed and funded by the American industrial war effort, led to numerous innovations and standardization of mass-customized products. Followed by the Digital Revolution, we are now experiencing the roboticization of prosthetic limbs. As innovations have come and gone, some essential technologies have been forgotten or ignored. Many successful products have been commercialized, but unfortunately, they are often rationed to those who need them most. Here we present a prototype device based on many prior discoveries, utilizing commercially available parts when possible. This device has the potential to reduce the overall costs of powered robotic prosthetics, making them accessible to those with knee instability or the fear of falling. Additional benefits of this device are that it is designed to improve the kinematic and kinetic symmetry of the lower extremities, including the hips. We will design, prototype, and test this robotic prosthetic leg for feasibility and safe performance.
KEYWORDS: ENGINEERING, LIMB LOSS, FEAR OF FALLING, POWERED ROBOTIC PROSTHETIC LEG, PROTOTYP
Neurofeedback Training for Attentional Processing in Anxious Individuals
Full text linkThe current study assessed the effectiveness of neurofeedback training for reducing anxiety symptoms and improving attention and response control in adults with self-reported anxiety. This paper presents a review of an archival database of a sample of individuals with reported attention concerns who received 20 to 40 neurofeedback training sessions at a university outpatient clinic. Participants were administered and completed the Integrated Visual and Auditory – Version 2 (IVA-2) Continuous Performance Test (CPT) and the General Well-Being Schedule (GWBS) before and after the intervention. Findings showed that participants significantly improved their scores on the Full Scale Attention Quotient (FAQ) and Full Scale Response Control Quotient (FRCQ) after completing 40 sessions of neurofeedback training. As a group, the 14 participants who completed 40 sessions of neurofeedback significantly increased their FAQ scores from a mean of 76.98 (Mildly to Moderately Impaired) at baseline to a mean of 93.66 (Average). As a group, the 14 participants who completed 40 sessions of neurofeedback significantly increased their FRCQ scores from a mean of 78.92 (Mildly to Moderately Impaired) at baseline to a mean of 93 (Average). There were no statistically significant changes in either overall GWBS scores nor anxiety subscale scores from baseline to post-intervention.
Keywords: neurofeedback; anxiety; attention; attentional processing, IVA-2; CPT; GWB
Factors Contributing to the Recognition of a Potential Nonsexual Multiple Relationship
Full text linkClinical psychologists encounter situations for which no prescriptive professional standards exist, necessitating therapists’ judgment to determine an appropriate course of action. This study examines the first step of therapists’ decision-making process—recognition of the potential for a nonsexual multiple relationship. Based on the existing literature and previous empirical findings, our hypotheses are that (1) therapist sex (female), higher scores on the PAQ Expressivity (femininity) scale, higher scores on the VIA-IS-V3 Self-control scale, and participants’ ranking Nonmaleficence as the most important ethical principle would be significantly (positively) predictive of Recognition scores, (2) higher scores on the PAQ Instrumentality (masculinity) scale, higher scores on the VIA-IS-V3 Inquisitiveness scale, and male (sex) participants who are presented with a vignette describing a potential nonsexual multiple relationship with a female client would be significantly (negatively) predictive of Recognition scores, and (3) PAQ Expressivity and Instrumentality scale scores would explain more unique variance in Recognition scores than therapist sex. An ordinal logistic regression analysis was used to investigate variance in therapists’ first step in the decision-making process. Findings indicated that our overall model did not fit the data and there was no significant difference between the baseline model and the final model. However, examination of individual predictor variables revealed that the female therapist and female client vignette combination was a significant positive predictor of Recognition score. Furthermore, exploratory analyses found that therapists who had the least clinical experience had less than expected Recognition scores of 0 (no recognition of an ethical issue) and therapists who had the most clinical experience had more than expected Recognition scores of 0. Overall, the findings of this study suggest that the influence of therapist and client factors on the decision-making process may be more salient to in later steps of the ethical decision-making process. The process at the immediate, reactive level (recognition) may be distinctly different from those at the levels of moral reasoning, establishment of moral intent, and/or engaging in moral behavior (Rest, 1979). With this, future studies should examine later steps of the therapist ethical decision-making process when confronted with a potential nonsexual multiple relationship with a client
James I. Robison (1888-1961)
No full textJames I. Robison was an association secretary of the General Conference at the time of the 1946 session. Robison was also the founding principal of La Sierra Academy, later La Sierra University.https://scholarsrepository.llu.edu/general-conference-1946-gallery/1019/thumbnail.jp
William Ambrose Spicer (1865-1952)
No full textWilliam Ambrose Spicer was president of the General Conference of Seventh-day Adventists from 1922-1930. At the time of the 1946 General Conference session, he was an associate editor of the Review and Herald.https://scholarsrepository.llu.edu/general-conference-1946-gallery/1028/thumbnail.jp
Eldine William Dunbar
No full textEldine William Dunbar was born in 1899 and died in 1989. At the time of the 1946 General Conference Session he was Young People\u27s Missionary Volunteer secretary.
Dunbar\u27s obituary in the Review and Herald, March 16, 1989 described his denominational service, saying that he was most noted for his work with Adventist youth. He worked with youth for 39 years, becoming a youth leader in the General Conference in 1944. Dunbar led in organizing the Pathfinder Club and was instrumental in setting standards for the youth organization\u27s Master Guide level.https://scholarsrepository.llu.edu/general-conference-1946-gallery/1003/thumbnail.jp