scholarly journals Influence of clinical experience on accuracy of virtual orthodontic attachment bonding in comparison with the direct procedure

2019 ◽  
Vol 89 (5) ◽  
pp. 734-741 ◽  
Author(s):  
Natalice S. De Oliveira ◽  
Emile Rossouw ◽  
Elizabeth M. B. Lages ◽  
Soraia Macari ◽  
Henrique Pretti
Keyword(s):  
Clinical Experience ◽  
Three Dimensional ◽  
Positive Influence ◽  
Angular Dimension ◽  
Digital Environment ◽  
Postgraduate Students ◽  
Direct Technique ◽  
Molar Teeth ◽  
Artificial Teeth ◽  
Attachment Bonding

ABSTRACT Objectives: To compare the accuracy of bonding orthodontic attachments in a digital environment with the direct bonding procedure depending on the level of the orthodontist's clinical experience. Materials and Methods: A total of 1120 artificial teeth of 40 identical models (20 solid sets + 20 digital sets) were divided into four groups: (1) direct bonding (experienced clinicians). (2) direct bonding (postgraduate students), (3) virtual bonding (experienced clinicians), and (4) virtual bonding (postgraduate students). The differences in individual position of the placed attachments were measured after three-dimensional superimposition of the models using customized software. Results: In the interoperator comparison, experienced clinicians were more exact than postgraduate students in virtual bonding in the angular dimension. Between the bonding techniques, virtual bonding was more accurate than the direct technique. The prevalence of errors was higher in the direct procedure than virtual bonding, and the errors were more significant in the premolar and molar teeth. Conclusions: Clinical experience had a positive influence in achieving a higher rate of correctness/accuracy in the angular dimension only during virtual bonding. Virtual bonding was more accurate than direct bonding in the vertical and horizontal dimensions. Early diagnosis of errors in the bonding positions of attachments could be of benefit to both clinicians and patients by predicting discrepancies that may lead to undesirable orthodontic movements.

Early Clinical Experience With Color Three-Dimensional Intravascular Ultrasound in Peripheral Interventions

2001 ◽  
Vol 8 (4) ◽  
pp. 329-338 ◽  
Author(s):  
Khalid Irshad ◽  
Donald B. Reid ◽  
Peter H. Miller ◽  
Raj Velu ◽  
George E. Kopchok ◽  
...  
Keyword(s):  
Intravascular Ultrasound ◽  
Clinical Experience ◽  
Three Dimensional ◽  
Early Clinical Experience

scholarly journals Polymeric Biomaterials for the Treatment of Cardiac Post-Infarction Injuries

Pharmaceutics ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1038
Author(s):  
Sonia Trombino ◽  
Federica Curcio ◽  
Roberta Cassano ◽  
Manuela Curcio ◽  
Giuseppe Cirillo ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Cardiac Tissue ◽  
Polymeric Nanoparticles ◽  
Three Dimensional ◽  
Cardiac Regeneration ◽  
Biological Properties ◽  
Positive Influence ◽  
Regenerative Process ◽  
Current Status ◽  
Polymeric Biomaterials

Cardiac regeneration aims to reconstruct the heart contractile mass, preventing the organ from a progressive functional deterioration, by delivering pro-regenerative cells, drugs, or growth factors to the site of injury. In recent years, scientific research focused the attention on tissue engineering for the regeneration of cardiac infarct tissue, and biomaterials able to anatomically and physiologically adapt to the heart muscle have been proposed as valuable tools for this purpose, providing the cells with the stimuli necessary to initiate a complete regenerative process. An ideal biomaterial for cardiac tissue regeneration should have a positive influence on the biomechanical, biochemical, and biological properties of tissues and cells; perfectly reflect the morphology and functionality of the native myocardium; and be mechanically stable, with a suitable thickness. Among others, engineered hydrogels, three-dimensional polymeric systems made from synthetic and natural biomaterials, have attracted much interest for cardiac post-infarction therapy. In addition, biocompatible nanosystems, and polymeric nanoparticles in particular, have been explored in preclinical studies as drug delivery and tissue engineering platforms for the treatment of cardiovascular diseases. This review focused on the most employed natural and synthetic biomaterials in cardiac regeneration, paying particular attention to the contribution of Italian research groups in this field, the fabrication techniques, and the current status of the clinical trials.

Tradition and Innovation in Cataloguing Medieval Manuscripts

2021 ◽  
Vol 139 (1) ◽  
pp. 32-58
Author(s):  
Orietta Da Rold
Keyword(s):  
New Technologies ◽  
New Technology ◽  
Early Career ◽  
Digital Environment ◽  
Digital Form ◽  
Postgraduate Students ◽  
Medieval Manuscripts ◽  
Early Career Researchers ◽  
History Of ◽  
And Training

Abstract In this essay, I offer a brief history of manuscript cataloguing and some observations on the innovations this practice introduced especially in the digital form. This history reveals that as the cataloguing of medieval manuscripts developed over time, so did the research needs it served. What was often considered traditional cataloguing practices had to be mediated to accommodate new scholarly advance, posing interesting questions, for example, on what new technologies can bring to this discussion. In the digital age, in particular, how do digital catalogues interact with their analogue counterparts? What skills and training are required of scholars interacting with this new technology? To this end, I will consider the importance of the digital environment to enable a more flexible approach to cataloguing. I will also discuss new insights into digital projects, especially the experience accrued by the The Production and Use of English Manuscripts 1060 to 1220 Project, and then propose that in the future cataloguing should be adaptable and shareable, and make full use of the different approaches to manuscripts generated by collaboration between scholars and librarians or the work of postgraduate students and early career researchers.

An experimental study of the influence of riblets on transition

1996 ◽  
Vol 315 ◽  
pp. 31-49 ◽  
Author(s):  
G. R. Grek ◽  
V. V. Kozlov ◽  
S. V. Titarenko
Keyword(s):  
Experimental Study ◽  
Three Dimensional ◽  
Negative Influence ◽  
Positive Influence ◽  
Linear Stage ◽  
Turbulent Transition ◽  
Transition Structures ◽  
Stage Transition ◽  
Tollmien Schlichting ◽  
Laminar Turbulent Transition

An experimental study of the effect of riblets on three-dimensional nonlinear structures, the so-called Λ-vortices on laminar-turbulent transition showed that riblets delay the transformation of the Λ-vortices into turbulent spots and shift the point of transition downstream. This result is opposite to the negative influence of such ribbed surfaces on two-dimensional linear Tollmien-Schlichting waves (the linear stage of transition). Thus, the ribbed surface influences laminar-turbulent transition structures differently: a negative influence on the linear-stage transition structures and a positive influence on the nonlinear-stage transition structures. It is demonstrated that transition control by means of riblets requires special attention to be paid to the choice of their location, taking into account the stage of transition.

scholarly journals Inter-rater variability of three-dimensional fracture reduction planning according to the educational background

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Christoph Zindel ◽  
Philipp Fürnstahl ◽  
Armando Hoch ◽  
Tobias Götschi ◽  
Andreas Schweizer ◽  
...  
Keyword(s):  
Distal Radius ◽  
Clinical Experience ◽  
Three Dimensional ◽  
Computer Assisted Surgery ◽  
Educational Background ◽  
Fracture Reduction ◽  
Computer Assisted ◽  
Operation Planning ◽  
Level Of Evidence ◽  
Fragment Displacement

Abstract Background Computer-assisted three-dimensional (3D) planning is increasingly delegated to biomedical engineers. So far, the described fracture reduction approaches rely strongly on the performance of the users. The goal of our study was to analyze the influence of the two different professional backgrounds (technical and medical) and skill levels regarding the reliability of the proposed planning method. Finally, a new fragment displacement measurement method was introduced due to the lack of consistent methods in the literature. Methods 3D bone models of 20 distal radius fractures were presented to nine raters with different educational backgrounds (medical and technical) and various levels of experience in 3D operation planning (0 to 10 years) and clinical experience (1.5 to 24 years). Each rater was asked to perform the fracture reduction on 3D planning software. Results No difference was demonstrated in reduction accuracy regarding rotational (p = 1.000) and translational (p = 0.263) misalignment of the fragments between biomedical engineers and senior orthopedic residents. However, a significantly more accurate planning was performed in these two groups compared with junior orthopedic residents with less clinical experience and no 3D planning experience (p < 0.05). Conclusion Experience in 3D operation planning and clinical experience are relevant factors to plan an intra-articular fragment reduction of the distal radius. However, no difference was observed regarding the educational background (medical vs. technical) between biomedical engineers and senior orthopedic residents. Therefore, our results support the further development of computer-assisted surgery planning by biomedical engineers. Additionally, the introduced fragment displacement measure proves to be a feasible and reliable method. Level of Evidence Diagnostic Level II

scholarly journals Microhardness in pressing layers of prefabricated modified acrylic resin teeth

2014 ◽  
Vol 62 (2) ◽  
pp. 143-147
Author(s):  
Ricardo dos Santos BAPTISTA ◽  
Gustavo Duarte MENDES ◽  
Milton Edson MIRANDA ◽  
Cecilia Pedroso TURSSI
Keyword(s):  
Analysis Of Variance ◽  
Aluminium Oxide ◽  
Acrylic Resin ◽  
Superficial Layer ◽  
The Third ◽  
Molar Teeth ◽  
Artificial Teeth ◽  
Knoop Indenter

OBJECTIVE: The aim of this study was to evaluate the microhardness in pressing layers of prefabricated modified acrylic resin teeth. METHODS: Lower first molar teeth with two (Biotone(r) IPN and Bioform(r)) or three pressing layers (Artiplus(r), Trilux(r) Eurovipi, and Natusdent(r)) were hemisected in a bucco-lingual plane and embedded in a self-curing acrylic resin (n =10). Specimens were then ground flat and polished using 400, 600 and 1200 aluminium oxide paper in a rotatory polisher. In each pressing layer, microhardness was measured using a Knoop indenter in three different locations spaced 300 µm apart under a 10-g load, applied for 5 sec. RESULTS: Analysis of variance and Tukey's tests demonstrated that there was no difference in microhardness in the first layer of the teeth analyzed (p = 0.355), whereas in the second layer, the brand Artiplus(r) showed higher values when compared to the brand Natusdent(r) (p = 0.018). For the third layer, the brands Artiplus(r) and Trilux(r) Eurovipi revealed higher microhardness when compared to Natusdent(r) teeth (p < 0.001). CONCLUSION: For the outer most superficial layer of the artificial teeth, the microhardness of the different brands was similar, while differences were noted for the second and third layers among the artificial teeth, with Artiplus(r) teeth showing higher microhardness than Natusdent(r).

scholarly journals Workflow of Digital Field Mapping and Drone-Aided Survey for the Identification and Characterization of Capable Faults: The Case of a Normal Fault System in the Monte Nerone Area (Northern Apennines, Italy)

2020 ◽  
Vol 9 (11) ◽  
pp. 616
Author(s):  
Mauro De Donatis ◽  
Mauro Alberti ◽  
Mattia Cipicchia ◽  
Nelson Muñoz Guerrero ◽  
Giulio F. Pappafico ◽  
...  
Keyword(s):  
Central Italy ◽  
Three Dimensional ◽  
Normal Fault ◽  
Field Work ◽  
Digital Data ◽  
Fault System ◽  
Seismic Profiles ◽  
Postgraduate Students ◽  
Recent Earthquakes

Field work on the search and characterization of ground effects of a historical earthquake (i.e., the Cagli earthquake in 1781) was carried out using terrestrial and aerial digital tools. The method of capturing, organizing, storing, and elaborating digital data is described herein, proposing a possible workflow starting from pre-field project organization, through reiteration of field and intermediate laboratory work, to final interpretation and synthesis. The case of one of the most important seismic events in the area of the northern Umbria–Marche Apennines provided the opportunity to test the method with both postgraduate students and researchers. The main result of this work was the mapping of a capable normal fault system with a great number of observations, as well as a large amount of data, from difficult outcrop areas. A GIS map and a three-dimensional (3D) model, with the integration of subsurface data (i.e., seismic profiles and recent earthquake distribution information), allowed for a new interpretation of an extensional tectonic regime of this Apennines sector, similar to one of the southernmost areas of central Italy where recent earthquakes occurred on 2016.

Visualization of morphological details in congenitally malformed hearts: virtual three-dimensional reconstruction from magnetic resonance imaging

2003 ◽  
Vol 13 (5) ◽  
pp. 451-460 ◽  
Author(s):  
Thomas Sangild Sørensen ◽  
Erik Morre Pedersen ◽  
Ole Kromann Hansen ◽  
Keld Sørensen
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Real Time ◽  
Clinical Experience ◽  
Spatial Information ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Resonance Imaging ◽  
Cardiac Malformations ◽  
Dimensional Reconstruction

In recent years, three-dimensional imaging has provided new opportunities for visualizing congenital cardiac malformations. We present the initial clinical experience using a recently implemented system, which employs some of new interactive, real-time, techniques. We show how three-dimensional rendering based on magnetic resonance imaging can provide detailed spatial information on both intrinsic and extrinsic cardiac relations, and hence how a virtual examination can potentially provide new means to a better understanding of complex congenital cardiac malformations.

Sign in / Sign up

Export Citation Format

Share Document