Summary The purpose of this follow‐up study was to measure the resonance frequency of Astra Tech TiO2 blasted implants at second surgery, at one and 3 years of loading. Secondly, it was investigated ...whether resonance frequency at second surgery could discriminate between successful implants and those that will fail over a 3‐year period. Fifty titanium dioxide‐blasted implants in eight consecutive patients with edentulous maxillas seeking fixed rehabilitations, were included in the study at abutment connection after 6 months of healing. Resonance frequency, clinical and radiographic records were obtained at abutment connection and after one and 3 years of loading. The cumulative survival rate after 3 years was 100%. The mean resonance frequencies were 65 ± 4·8 implant stability quotient (ISQ) at second surgery (range 50–78 ISQ), 66 ± 3·4 ISQ after 1 year of loading (range 53–76 ISQ) and 64 ± 3·8 ISQ after 3 years of loading (range 53–77 ISQ). No significant differences resulted between these three time points. The marginal bone level decrease of 0·6 mm between the second surgery and the 3‐year follow‐up was observed. One limitation of the study is that no late failures were encountered in this relatively small sample. Consequently, it was not possible to establish a cut‐off ISQ for implants that, after abutment connection, would maintain their stability over a 3‐year period. Nevertheless, it might be concluded that following the first year of loading the range of 53–76 ISQ describes the stability of osseointegrated Astra Tech TiO2 blasted implants.
To understand the unstructured experiences of staff nurses in an obstetric unit with undergraduate nursing students present.
Naturalistic inquiry.
Family birth center in Pacific Northwest.
...Convenience sample, 12 English speaking, baccalaureate-prepared registered nurses (RNs) who worked in unstructured manner with nursing students.
Semistructured interviews were conducted and recorded. Participants shared their experiences of working with students. Data were analyzed using an interpretive continuous approach according to Lincoln and Guba's elucidation of Glaser and Strauss's constant-comparative method, and data were stored, organized, and coded. Data collection and analysis ceased when categories were saturated and no new information surfaced. Demographic data were analyzed using descriptive statistics. An experienced qualitative researcher provided oversight to ensure accuracy. Credibility, transferability, dependability, confirmability were used to ensure trustworthiness.
Five themes emerged as follows: giving and receiving: working with students provided nurses opportunities to give back to their profession—nurses learned from students; advancing professionally and personally: many nurses took advantage of workplace incentives to gain additional compensation and opportunities; balancing act: nurses balanced their typical workloads with student learning needs and provision of safe, quality care—students slowed nurses down; getting to know and working with you: nurses worked to know student personally and tailored the learning experience—nurses desired students be prepared; past and present: clinical experiences exert long lasting impressions.
Clinical learning is integral to nursing education and preparation for professional practice. Increased enrollments in baccalaureate nursing programs require more staff nurses to supervise students in the workplace. Researchers have found students’ learning, impressions of nursing, and perceptions of clinical learning are greatly influenced by nurses in the workplace, and working with students is a benefit for many nurses. Workplace learning may increase when students are prepared prior to entering clinical settings. Nurses working with students should be judiciously selected. Future research should be aimed at discovering tangible rewards and benefits that motivate nurses to work in an unstructured manner with students and determine how students in the workplace influence patient safety and quality of care.
Nanotechnology is a broad field combining traditional scientific disciplines; however, analytical chemistry plays an important role in material design, synthesis, characterization, and application. ...This article emphasizes the uniqueness of nanotechnology and the importance of providing high-quality undergraduate research experiences to both attract and retain talented individuals to the field of nanotechnology. In response to this need to develop a strong and sustainable nanotechnology work force, strategies to create authentic research experiences are considered within the framework of an interdisciplinary nanotechnology environment at West Virginia University. The program, named NanoSAFE Research Experiences for Undergraduates (REU), embeds students in different departments at West Virginia University and in research laboratories within the National Institute of Occupational Safety and Health. A large number of participants have little or no prior research experience and a strong effort is made to recruit applicants from under-represented populations. Components designed to foster research proficiency include frequent reporting, a strong peer-network, and training for secondary mentors. Evidence, which includes student publications and assessment findings demonstrating self-efficacy, is discussed to substantiate the viability of the strategies used in the 2016–2018 program.
Graphical abstract
ᅟ
Objectives: This study investigated the correlation of quantitative ultrasound with bone quality as evaluable from implant final insertion torque.
Material and methods: Implants were planned at ...diaphyses (group 1) and epiphyses (group 2) of 16 rabbit femurs where amplitude‐dependent speed of sound (Ad‐SOS) was measured. The insertion torque from 7‐mm‐long implants placed at planned sites was recorded. The correlation between cutting torque and Ad‐SOS was evaluated using Spearman's coefficient.
Results: Statistics were based on data from 15 diaphyses and 13 epiphyses. The mean insertion torque was 8.8 N cm while the mean Ad‐SOS was 1710.9 m/s. A negative correlation resulted between insertion torque and Ad‐SOS.
Conclusions: In the rabbit bone model investigated, quantitative ultrasound correlates inversely with implant insertion torque. Although this correlation remains to be verified in humans because rabbit femur does not convincingly represents different human bone qualities, it seems that ultrasound could convey potentially useful, pre‐surgical, site‐specific, non‐invasive information on bone mechanical characteristics therefore deserving further research efforts.
To cite this article:
Veltri M, Valenti R, Ceccarelli E, Balleri P, Nuti R, Ferrari M. The speed of sound correlates with implant insertion torque in rabbit bone: an in vitro experiment. Clin. Oral Impl. Res. 21, 2010; 751–755. doi: 10.1111/j.1600‐0501.2009.01873.x
The clinical learning experience is used in nursing programs of study worldwide to prepare nurses for professional practice. This study's purpose was to use Naturalistic Inquiry to understand the ...experiences of staff nurses in an obstetrical unit with undergraduate nursing students present for clinical learning. A convenience sample of 12 staff nurses, employed on a Family Birth Center, participated in semi-structured interviews. The constant comparative method as modified by Lincoln and Guba was used to analyze data. Five themes related to staff nurses experiences of clinical learning were identified: Giving and Receiving; Advancing Professionally and Personally; Balancing Act; Getting to Know and Working with You; and Past and Present. This research highlights staff nurses' experiences of clinical learning in undergraduate nursing education. Staff nurses exert a powerful, long lasting influence on students. A need exists to prepare and judiciously select nurses to work with students. Clinical agencies and universities can take joint responsibility providing tangible incentives, financial compensation, and recognition to all nurses working with nursing students.
•Sometimes nurses decline to work with students due to difficulties providing an optimal CLE.•Some nurses working with students may not advance personally or professionally.•Nurses' working with students balance need to accomplish their work with provision of quality nursing care.•Nurses exert a long lasting influence on students learning, feelings about CLE, and future nursing practice.•Nurses desire students to be prepared for and actively engaged in the CLE.
Track reconstruction at future hadronic colliders such as FCC-hh poses non negligible challenges due to the expected unprecedented levels of radiation affecting the tracking detectors. Detectors ...featuring excellent spatial and time resolution as well as very high radiation hardness are deemed to be essential for efficient tracking at future experiments. 3D Diamond pixel sensors are considered very promising candidates to fulfil these requirements as they pair the well known excellent timing characteristics and radiation hardness of diamond. We report on the timing characterisation of innovative 3D pixel diamond detectors with electrodes obtained by a laser graphitisation technique optimised for high time resolution. Results of a test beam provide for the first time a time resolution well below 100 ps with an efficiency larger than 99%. Hybridisation of the sensors with a dedicated timing ASIC is also presented for the first time.
A 4D diamond detector for HL-LHC and beyond Anderlini, L.; Bellini, M.; Corsi, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2022, Volume:
1040
Journal Article
Peer reviewed
Tracking detectors for the future hadronic machines are expected to stand an extreme level of radiation and to provide at the same time high space and time resolutions. Diamond detectors satisfy both ...of the latter requirements and, in addition, a 3D geometry with thin columnar resistive electrodes orthogonal to the diamond surface enhances the natural radiation tolerance and response speed of this material. We report on the timing characterization of a 3D pixel diamond detector prototype fabricated, by laser graphitization with a 55 × 55 μm2 pixel geometry, in Firenze. Results of a tests beam provide a time resolution well below 100 ps with an efficiency larger than 99%.
The popliteal tendon has a significant attachment to the fibula, the popliteofibular ligament. The role of this ligament in knee stability has not been determined. In this study we used selective ...cutting techniques to measure the static contribution of the popliteal tendon attachments to the tibia and the popliteofibular ligament for stability of the knee. Sectioning of all the posterolateral structures except the popliteal tendon attachments to the tibia or the popliteofibular ligament resulted in increased primary posterior translation, varus rotation, external rotation, and coupled external rotation. Although statistically significant, these increases were small. Sectioning of all the posterolateral structures resulted in larger increases in primary posterior translation, varus rotation, external rotation, and coupled external rotation. Our data indicate that the popliteal tendon attachments to the tibia and the popliteofibular ligament are important in resisting posterior translation and varus and external rotation. If an isolated injury to the posterolateral structures occurs, anatomic reconstruction of the major ligaments that restrain posterior translation and varus and external rotation may provide the best functional result. Reconstruction for isolated posterolateral instability should include anatomic attachment of the popliteal tendon to the tibia and the popliteofibular ligament.
The ELI-NP facility, currently being built in Bucharest, Romania, will deliver an intense and almost monochromatic gamma beam with tunable energy between 0.2 and 20 MeV. The challenging energy ...bandwidth of
≤
0.5% will be adjusted through the collimation system, while the main beam parameters will be measured through a devoted gamma-beam characterization system.
1
The gamma-beam characterization system, designed by the EuroGammaS collaboration, consists of four elements: a Compton spectrometer that measures the gamma energy spectrum; a sampling calorimeter for a fast combined measurement of the beam average energy and its intensity, which will be used also as a monitor during machine commissioning and development; a nuclear resonant scattering system for absolute energy inter-calibration of the other detectors; and a gamma beam profile imager to be used for alignment and diagnostics purposes. The collimation and characterization system will be presented in this article. These systems have already been built and tested, while the delivery at ELI-NP facility and the final commissioning is scheduled by Fall 2018.
PDF
