Search

Purpose: This small scale study examined if an individualized motivational interviewing (MI) approach to oral health education promoted positive changes in early childhood caries (ECC) risk-related behaviors of mothers enrolled in a Women, Infants and Children (WIC) Program. Methods: Seventy-two mothers were recruited to complete pretest and posttest questionnaires 4 weeks apart. Mothers in the treatment group (n=40) experienced a counseling type session (MI) and follow-up telephone calls to promote positive oral health behaviors. Results: No significant change was found in the 4 constructs measured: valuing dental health, permissiveness, convenience and change difficulty or openness to health information. Statistically significant positive changes were found in the treatment group only in number of times the children's teeth were cleaned or brushed (p=0.001) and the use of shared eating utensils (p=0.035). Other cariogenic feeding practices and use of sweets to reward or modify behavior were not significantly affected (p<0.05). Conclusions: In this group of WIC mothers, MI appeared to have a modest impact on some high-risk parental behaviors that contribute to ECC. This approach warrants further investigation to assess impact of an extended intervention program, parents from diverse populations and the feasibility of use of peer counselors in the public health setting. [ABSTRACT FROM AUTHOR]

Importance: Firearm violence is a leading cause of death in the US. There is broad public agreement that individuals at high risk of perpetrating violence should not be allowed to purchase or possess firearms. The National Instant Criminal Background Check System (NICS) is a national system intended to stop firearm purchases or possession by prohibited persons, but there is heterogeneity in how states interact with and report data to NICS., Objective: To examine variability in state requirements for NICS reporting for mental health prohibitions., Design and Setting: This cross-sectional study in the US reviewed current statutes for all 50 states and the District of Columbia (enacted through the 2021 legislative session) regarding reporting mental health prohibitions to NICS or state systems. Data were analyzed from October 2022 to April 2023., Main Outcomes and Measures: For each state, the following were recorded: reliance on Federal Bureau of Investigation vs state point of contact for NICS checks; regulation requiring or allowing reporting to NICS for 3 hypothetical cases; and details on reporting responsibility and time frame. The number of NICS listings for adjudicated mental health reasons was obtained, and state rates per 1000 population were calculated. To compare states, we developed 3 hypothetical cases of individuals with risk of firearm violence, whether possibly temporary (involuntary commitment for decompensated psychosis, or involuntary short-term psychiatric hold for suicidal ideation) or chronic and progressive (court-appointed guardianship for dementia)., Results: A total of 39 states required and 5 allowed reporting to NICS for court-ordered, involuntary psychiatric hospitalization. Thirteen states required and 5 allowed reporting to NICS when a court determines an individual is mentally incompetent to manage their affairs (with or without guardianship). Two states required NICS reporting for short-term emergency psychiatric holds. Five states and the District of Columbia had no legislation explicitly requiring or allowing NICS reporting in the 3 scenarios., Conclusions and Relevance: In this cross-sectional study of state laws, there was substantial heterogeneity in NICS reporting requirements and lack of clarity around processes. This raises questions about the ability of NICS to be used to block firearm purchases or possession by individuals with court-identified high risk of perpetrating violence toward themselves or others.

Purpose: Limited data document dental hygienists' preparedness for intimate partner violence (IPV) screening and response. The aim of this study was to assess dental hygienists' readiness to screen for IPV and provide baseline information for the realization of action toward addressing IPV. Methods: The Domestic Violence Healthcare Provider Survey (DVHPS) instrument was distributed online to all members of the Texas Dental Hygienists' Association (n=1100). Four hundred fifteen emails were opened and 114 (n=114) surveys were returned for 28% response rate. This validated survey measures six scales: perceived self-efficacy, fear of offending patients, victim personality/traits, professional role resistance, perceptions of victim disobedience causing IPV, and psychiatric support. Descriptive statistics were used to calculate mean scores for each scale. Specific criteria were applied to interpret the level of readiness based on the scale scores. Results: A little more than one quarter of the respondents (28%) reported having had course content related to IPV as students in their dental hygiene program curriculum, while 27% reported completing continuing education on IPV. A significant proportion of participants, 40%, were uncertain if routine IPV screening was within their professional role. They did not perceive self-efficacy in their screening capabilities ( m =3.08 with 5.0 as the strongest), however they reported possessing a strong knowledge regarding IPV victims' personality/traits and did not blame the victims ( m =1.92 and 1.48 respectively with 1.0 as the strongest). Conclusion: Results confirm earlier studies indicating the need for IPV training for oral health care professionals. Specifically, there is an evident need for training to increase dental hygienists' self-efficacy regarding IPV screening. Dental hygienists play a critical role in IPV screening and should be prepared to face the challenges presented by IPV and be available to meet the needs of IPV victims through referral to the appropriate support services., (Copyright © 2018 The American Dental Hygienists’ Association.)

Purpose: The purpose of this pilot study was to compare public perceptions of Idaho adults regarding oral cancer (OC) screening with other common cancer screenings including breast cancer (BC), prostate cancer (PC), and colon cancer (CC) screenings. Methods: This study utilized a convenience sample (N=100) of Idaho residents. A self-designed, validated interview-administered questionnaire was administered by a data collection service using computer-assisted telephone interview software to assess consumer perceptions about cancer screenings. Data were analyzed using descriptive statistics, frequencies, and Pearson's Chi-Square tests. Results: Participants were predominantly white (90%) with a mean age of 52.7 years with some post-high school education (80%) and the majority had received OC screenings (54%).The majority of participants perceived benefits of each specific cancer screening as very helpful: (a) OC screening (60%), (b) BC screening (79.2% females), (c) PC screening (63.8% males), and (d) CC screening (84%), and also reported no perceived risks regarding OC (80%), BC (60.4%), PC (66%) screening. Only 11% reported fear of finding cancer with an OC screening. The study findings supported significant associations (p<0.05) between consumer perceptions of cost and time as barriers to accessing all of the selected cancer screenings. Conclusion: This study identified associations between consumer perceptions of OC screening when compared with BC, PC, and CC. Concerns about cost and time for cancer screenings may reflect low consumer awareness regarding differences between OC and other cancer screenings. Future studies including larger samples representing more diverse populations are recommended to further explore the basis of participants' perceptions of cancer screenings and to identify ways to minimize barriers to cancer screenings., (Copyright © 2017 The American Dental Hygienists’ Association.)

Faculty calibration studies for calculus detection use two different standards for examiner evaluation, yet the only therapeutic modality that can be used for nonsurgical periodontal treatment is scaling/root debridement or planing. In this study, a pretest-posttest design was used to assess the feasibility of faculty calibration for calculus detection using two accepted standards: that established by the Central Regional Dental Testing Service, Inc. (CRDTS; readily detectible calculus) and the gold standard for scaling/root debridement (root roughness). Four clinical dental hygiene faculty members out of five possible participants at Halifax Community College agreed to participate. The participants explored calculus on the 16 assigned teeth (64 surfaces) of four patients. Calculus detection scores were calculated before and after training. Kappa averages using CRDTS criteria were 0.561 at pretest and 0.631 at posttest. Kappa scores using the scaling/root debridement or planing standard were 0.152 at pretest and 0.271 at posttest. The scores indicated improvement from moderate (Kappa=0.41-0.60) to substantial agreement (Kappa=0.61-0.80) following training using the CRDTS standard. Although this result differed qualitatively and Kappas were significantly different from 0, the differences for pre- to post-Kappas for patient-rater dyads using CRDTS were not statistically significant (p=0.778). There was no difference (p=0.913) in Kappa scores pre- to post-training using the scaling/root debridement standard. Despite the small number of participants in this study, the results indicated that training to improve interrater reliability to substantial agreement was feasible using the CRDTS standard but not using the gold standard. The difference may have been due to greater difficulty in attaining agreement regarding root roughness. Future studies should include multiple training sessions with patients using the same standard for scaling/root debridement used for evaluation of students.

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application., (Copyright © 2016 The American Dental Hygienists’ Association.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application., (Copyright © 2016 The American Dental Hygienists’ Association.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application., (Copyright © 2015 The American Dental Hygienists’ Association.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application., (Copyright © 2015 The American Dental Hygienists’ Association.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with a Conclusion to translate the research findings into clinical application., (Copyright © 2015 The American Dental Hygienists’ Association.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application., (Copyright © 2014 The American Dental Hygienists’ Association.)

This article describes the implementation and evaluation of a dental hygiene faculty development course to enhance online teaching practices that foster a sense of community and satisfaction. The sampled population was drawn from the forty-seven U.S. dental hygiene programs that the American Dental Hygienists' Association identified as offering bachelor's degree completion or master's degree programs with 76-100 percent of coursework delivered in an online format. This requirement was applied to exclude programs using hybrid instruction (combination of online and face-to-face). Of the thirty-four faculty members who self-identified as meeting the criteria, seven agreed to participate (21 percent response rate); however, only five completed all parts of the study (a final response rate of 15 percent). A Community of Inquiry framework was the basis for the author-designed Distance Education Best Practices Survey used as a pretest and posttest to assess participants' use of and perceived importance of twenty-five best practices before and after taking the online faculty development course. Frequency of use ratings ranged from 4.0 (regularly) to 5.0 (always) on a response scale from 1.0 to 5.0. The results showed significant increases from before to after the course in participants' perceptions of the importance of four practices: activities promoting relevant, lifelong learning (p=0.03); faculty communication fostering a sense of community (p=0.04); encouraging students' self-introduction (p=0.04); and encouraging productive dialogue and respecting diverse opinions (p=0.04). The findings indicate a potential value for a faculty development course designed to enhance online teaching, sense of community, and satisfaction, even for faculty members with high self-ratings regarding best practices.

This preintervention/postintervention pilot study examined impact of onsite support by a dental hygiene champion (DHC) on oral health and quality of life (QOL) of elderly residents in three long-term care facilities (LTCFs) in Arkansas. Oral health and oral health-related QOL were operationalized using the Oral Health Assessment Tool (OHAT) and Geriatric Oral Health Assessment Index (GOHAI), respectively. CNAs in Facility A received standardized oral health education/materials with onsite DHC support. Facility B received education/materials only. Facility C served as control. Data analyses included Wilcoxon-signed rank tests (OHAT) and repeated measures ANOVA (GOHAI) (p ≤ .05). OHAT postintervention data in Facility A showed significant improvements in three measured areas (tongue health, denture status, and oral cleanliness); in Facility B, one area (tongue health); and none in Facility C. No significant differences were found in GOHAI scores across facilities. Findings suggest that the presence of DHCs in LTCFs may positively impact the oral health of CNA-assisted residents., (© 2014 Special Care Dentistry Association and Wiley Periodicals, Inc.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application.

Dental hygiene is defined as the science and practice of the recognition, treatment and prevention of oral diseases. The history of dental hygiene research is considered in the context of the development of the discipline and an emerging infrastructure. Research-related events supporting the growth and maturation of the profession are considered from the early years to the most recent. The benefits of preventive oral health services provided by dental hygienists have been supported by research, and the practice of dental hygiene has expanded as a result of research findings since its inception 100 years ago. Dental hygienists' engagement in research, however, did not begin until the 1960s as research associates or administrators, primarily with dental researchers as primary investigators. The Journal of Dental Hygiene (JDH) has provided information for dental hygiene practice since 1927, and has been the primary venue for dissemination of dental hygiene research since 1945. Graduate education in dental hygiene at the master's degree level and the work of early dental hygiene researchers led to the first conference on dental hygiene research in 1982. Over 30 years later, dental hygiene has established a meta-paradigm and defined conceptual models, built an initial infrastructure to support research endeavors and contributed much to the development of dental hygiene as a unique discipline. A doctoral degree in the discipline, continued theory-based research, initiatives to foster collaborations between dental hygiene and other researchers and enhanced capabilities to attract funding to support large scale studies are goals that must be attained through the efforts of future researchers to address the needs for additional development in the discipline of dental hygiene. Dental hygiene research supports the growing discipline and its value to society.

Designing proteins that reflect the natural variability of a pathogen is essential for developing novel vaccines and drugs. Flaviviruses, including Dengue (DENV) and West Nile (WNV), evolve rapidly and can "escape" neutralizing monoclonal antibodies by mutation. Designing antigens that represent many distinct strains is important for DENV, where infection with a strain from one of the four serotypes may lead to severe hemorrhagic disease on subsequent infection with a strain from another serotype. Here, a DENV physicochemical property (PCP)-consensus sequence was derived from 671 unique sequences from the Flavitrack database. PCP-consensus proteins for domain 3 of the envelope protein (EdomIII) were expressed from synthetic genes in Escherichia coli. The ability of the purified consensus proteins to bind polyclonal antibodies generated in response to infection with strains from each of the four DENV serotypes was determined. The initial consensus protein bound antibodies from DENV-1-3 in ELISA and Western blot assays. This sequence was altered in 3 steps to incorporate regions of maximum variability, identified as significant changes in the PCPs, characteristic of DENV-4 strains. The final protein was recognized by antibodies against all four serotypes. Two amino acids essential for efficient binding to all DENV antibodies are part of a discontinuous epitope previously defined for a neutralizing monoclonal antibody. The PCP-consensus method can significantly reduce the number of experiments required to define a multivalent antigen, which is particularly important when dealing with pathogens that must be tested at higher biosafety levels., (Copyright © 2012 Elsevier Ltd. All rights reserved.)

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application.

Purpose: To assess if patients with chronic obstructive pulmonary disease (COPD) receiving periodontal debridement for treatment of chronic periodontitis with ultrasonic or hand instrumentation experienced changes in quality of life or incidents of illness following treatment or no treatment., Methods: The study design was a 3 group, randomized, controlled pre- and post-test experimental pilot study. Volunteers with COPD and chronic periodontitis (n=30) were recruited from physician offices or fliers and randomly assigned to 1 of 3 groups. Of those, 2 groups had periodontal debridement using either magnetostrictive ultrasonic instrumentation (n=10) or hand instrumentation (n=10). A control group (n=10) received no treatment. Primary outcomes, quality of life and illness were measured by the St. George's Respiratory Questionnaire (SGRQ-A) and Illness Questionnaire, respectively. Subjects completed the questionnaires as pre-tests at baseline and as post-tests 4 weeks post-treatment/no treatment. Repeated measures ANOVA was used to compare groups on continuous variables (p ≤ 0.05) measured by SGRQ-A total scores and symptoms, activities and impacts subscales. Percentages, frequencies and cross tabulations were calculated for categorical data., Results: SGRQ-A and Illness Questionnaire scores showed no significant differences between groups in quality of life or illness following periodontal debridement. Total SGRQ-A scores decreased slightly for all groups with no significant difference among groups (p=0.138) and no interaction (p=0.794). Cross tabulations showed no relationship between indicators of self-reported illness before and after treatment/no treatment. No adverse events were reported., Conclusion: Based on this small-scale study, it seems periodontal debridement for chronic periodontitis has no effect on quality of life and illness in patients with COPD, and it may be performed with ultrasonic or hand instruments without adverse events.

Background: Analysis of large sets of biological sequence data from related strains or organisms is complicated by superficial redundancy in the set, which may contain many members that are identical except at one or two positions. Thus a new method, based on deriving physicochemical property (PCP)-consensus sequences, was tested for its ability to generate reference sequences and distinguish functionally significant changes from background variability., Methods: The PCP consensus program was used to automatically derive consensus sequences starting from sequence alignments of proteins from Flaviviruses (from the Flavitrack database) and human enteroviruses, using a five dimensional set of Eigenvectors that summarize over 200 different scalar values for the PCPs of the amino acids. A PCP-consensus protein of a Dengue virus envelope protein was produced recombinantly and tested for its ability to bind antibodies to strains using ELISA., Results: PCP-consensus sequences of the flavivirus family could be used to classify them into five discrete groups and distinguish areas of the envelope proteins that correlate with host specificity and disease type. A multivalent Dengue virus antigen was designed and shown to bind antibodies against all four DENV types. A consensus enteroviral VPg protein had the same distinctive high pKa as wild type proteins and was recognized by two different polymerases., Conclusions: The process for deriving PCP-consensus sequences for any group of aligned similar sequences, has been validated for sequences with up to 50% diversity. Ongoing projects have shown that the method identifies residues that significantly alter PCPs at a given position, and might thus cause changes in function or immunogenicity. Other potential applications include deriving target proteins for drug design and diagnostic kits.

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application.

The purpose of Linking Research to Clinical Practice is to present evidence based information to clinical dental hygienists so that they can make informed decisions regarding patient treatment and recommendations. Each issue will feature a different topic area of importance to clinical dental hygienists with A BOTTOM LINE to translate the research findings into clinical application.

This review summarizes the available literature for both instruction and evaluation of the novice dental and dental hygiene preclinical student. Effective instruction for dental and dental hygiene instrumentation requires knowledge of motor skills theory and mechanisms of fine motor skills attainment. The novice learner requires small, explicit steps that clearly define production. Prior to any performance, the skill to be performed should be envisioned accurately by the learner. Timely, precise feedback from the instructor to the learner contributes to learning. Novices are unable to judge their performance accurately, so self-assessment skills must be taught. Repetition enhances motor performance. Instruction is supported through well-designed evaluation instruments containing explicit criteria arranged in the correct order of production. Assessment tools should be designed to aid in providing specific, immediate feedback. Well-designed assessments may also aid in calibration of instructors. Examples of evaluation instruments are found in the literature, and several are reviewed in this article. For those responsible for preclinical performance assessment, application of current motor skills theory and development of appropriate instruction and evaluation instruments may result in improved student performance. Studies also indicate the instructional environment in the dental clinical setting may be less stressful if evaluation is based on achievement of target levels rather than multiple daily grades.

Polymersomes are polymer-based vesicular shells that form upon hydration of amphiphilic block copolymers. These high molecular weight amphiphiles impart physicochemical properties that allow polymersomes to stably encapsulate or integrate a broad range of active molecules. This robustness together with recently described mechanisms for controlled breakdown of degradable polymersomes as well as escape from endolysosomes suggests that polymersomes might be usefully viewed as having structure/property/function relationships somewhere between lipid vesicles and viral capsids. Here we summarize the assembly and development of controlled release polymersomes to encapsulate therapeutics ranging from small molecule anti-cancer drugs to siRNA and therapeutic proteins.

Rationale: Information is sparse on neurotransmitter deficiencies in frontotemporal dementia (FTD), in particular with reference to distinct histological subgroups and Alzheimer's disease (AD)., Objectives: To evaluate in FTD with the major histologies, and compare with AD and controls, neurotransmission indices, as these may help in developing treatment., Materials and Methods: Post-mortem grey matter from Brodmann Area 21, 9 and 7 of 51 brains was assayed for ten neurochemical parameters indexing neurotransmission. Repeated measures analyses of variance were carried out for each parameter comparing groups (FTD vs AD vs control) at each anatomical site., Results: In FTD only the indices of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid, serotonin (5-HT)(1A) and 5-HT(2A) receptors were significantly reduced from control values. Of the ten parameters only 5-HT(1A) receptors showed significant group x site interaction. This reflected disproportionate reduction in frontal and temporal compared to parietal cortex. In FTD three other receptors (muscarinic, M(1), N-methyl-D: -aspartate, NMDA, and kainate), choline acetyltransferase (ChAT) activity, 5-HT and 5-hydroxyindoleacetic acid content and 5-HT reuptake site values were not significantly reduced from control values. Only 5-HT, 5-HT reuptake site and ChAT values were significantly higher in FTD than AD. NMDA receptor and ChAT values were significantly reduced from control only in AD., Conclusions: Neurochemical results in FTD indicate degeneration and loss of pyramidal neurones in frontotemporal neocortex, yet 5-HT afferents and 5-HT concentration, which are inhibitory on pyramidal neurones, were relatively preserved. This could lead to an excess of extraneural 5-HT causing underactivity of surviving pyramidal neurones. Pharmacotherapy with a 5-HT(1A) receptor antagonist may be indicated.

This exploratory study evaluated curricular content and evaluation mechanisms related to ethics and professionalism in the baccalaureate dental hygiene program at Idaho State University. Competency-based education requires enhanced student preparation in ethical reasoning, critical thinking, and decision-making. Graduates must integrate concepts, beliefs, principles, and values to fulfill ethical and professional responsibilities. Methods included 1) development of five supporting competencies defining ethics and professionalism to provide a framework for curricular evaluation; 2) assessment of all course content and evaluation methods for each supporting competency; 3) evaluation of students' clinical performance based on professional judgment grades; and 4) survey of junior (n=30) and senior (n=27) students' attitudes about dental hygiene practice related to ethics and professionalism. Results revealed that most courses include content and evaluation related to at least one supporting competency; however, authentic evaluation is weak. Clinical instructors rarely relate evaluations to ethical principles or values. Surveys showed significant differences between junior and senior students' attitudes about ethics and professionalism in six of thirty-four areas (the six were laws and regulations; communication and interpersonal skills; problem solving; professional activities/programs; integrity; and safe work environment). This article shares one approach for evaluating curricular content and evaluation methods designed to develop student competence in ethical reasoning and professionalism. Based upon the study's findings, recommendations are made for curricular enhancement via authentic evaluation and faculty training.

The mismetabolism of amyloid precursor protein (APP), favouring the production of A beta, is considered to be central to the pathogenesis of Alzheimer's disease (AD). However it remains to be established whether the causative factor is the reported toxicity of A beta or reduced production of secretory derivatives of APP which may have trophic or neuroprotective properties. One possible contributory factor to an imbalance in APP metabolism is the impaired cellular energy availability described in AD. The aim of this study was to investigate processing of APP-like proteins following inhibition of oxidative energy metabolism in PC12 cells. Under these conditions, intracellular and secreted APP-like proteins were significantly reduced. Treatment of energy perturbed cells with the lysosomotropic agent chloroquine restored intracellular concentrations of APP-like proteins to the control range, while the secretion was completely restored by activation of protein kinase C. These findings raise the possibility that energy related metabolic stress may lead to altered metabolism of APP-like proteins favouring a potentially amyloidogenic pathway. Furthermore, the observation that activation of PKC is able to overcome this potentially pathogenic process has important implications for treatment of AD with the current generation of cholinomimetic drugs, suggesting that such drugs may slow disease progression as well as improve cognitive dysfunction.

We have examined the time course of neurodegeneration in subcortical nuclei and other cortical areas known to project to the rat parietal cortex, following unilateral injection of the suicide transport agent, volkensin, into the cortex of one side. Degenerating neurons, visualized by Gallyas silver staining were most prominent 21 days after injection. At this time darkly staining neurons were present in nuclei and areas known to project to the injected cortical area but not in other sites. Affected subcortical nuclei included the ipsilateral ventral thalamus and intralaminar nuclei, the basal nucleus of Meynert and claustrum of the same side, and the dorsal median raphé nucleus of both sides. Within the cortex degenerating pyramidal neurons were visible in the contralateral parietal cortex and in the frontal cortex of the same side. The distribution of degenerating cells is in agreement with the conclusion that only neurons projecting to the injection site were affected. The time course of the appearance of the degeneration and its distribution are in keeping with axonal transport rather than spread by diffusion of the toxin. Neuronal counts in Nissl-stained sections of the contralateral SMI confirmed significant neuronal loss 28 days after injection. In situ hybridization studies using an oligonucleotide probe directed against GAD mRNA and counts of GAD mRNA-positive neurons in the contralateral cortex confirmed that this population of cortical interneurons, which do not project to the injection site, were unaffected.

Positron and single-photon emission tomography at present visualize only loss of overall brain substance, with a few exceptions. This has improved diagnostic accuracy in the clinic but further improvements could be made. By using toxins, such as volkensin, brain tissues can be produced that are deficient in various subpopulations of cortical pyramidal neurone. Experimental lesions in rats and quantitative autoradiography were used to investigate the cellular localization of receptors. Lesions were produced by intrastriatal or intracortical injections of volkensin to destroy corticofugal and corticortical pyramidal neurones respectively. Volkensin treatment caused significant loss of pyramidal neurones which was accompanied by reduced binding to certain receptors. Results are discussed in terms of the biology of cortical pyramidal neurones and in vivo imaging in Alzheimer's disease.

Purpose: The objective of this study was to identity specific factors that contribute to dental hygienists remaining in the same private practice employment setting for five or more years. Working conditions, the employer and the organizational structure of the employment setting, scope of practice, and personal factors were assessed., Methods: In 1992, a self-designed questionnaire was sent to a sample of 1,200 licensed dental hygienists. One state was randomly chosen from each of the 12 American Dental Hygienists' Association (ADHA) regions of the United States, and 100 licensed dental hygienists were randomly selected from each of these twelve states. Data were analyzed using univariate analysis (frequency distribution) and multivariate analyses (factor analyses)., Results: A 62.9% (n = 755) response rate was obtained from the 1200 questionnaires mailed. Of those dental hygienists, 14.3% (n = 108) were not practicing, and 85.7% (n = 647) were currently practicing. Nearly two-thirds (63.3%; n = 480) of the total number of respondents had been practicing five or more years in the same practice setting. Six major factors were identified by dental hygienists as reasons for remaining in one private practice setting for at least five years (1) quality/safe work environment, (2) time management for high-quality dental hygiene services, (3) effective employer office policies/procedures and personnel management, (4) employer support of professional career, (5) supportive work environment, and (6) variety in scope of practice., Conclusions: Factors identified in this study as influential in dental hygienists' retention in private practice are similar to those identified as reasons for leaving the profession in previous attrition and reentry studies. To increase retention and job satisfaction of dental hygienists in the private practice setting, strategies for effectively working with employers should be emphasized in dental hygiene and dental curriculums and in continuing education programs.