Computer-guided software and kits have significantly improved the clinical applications of implant surgery. Nonetheless, some technical problems are still in evidence during clinical procedures ...because of cumbersome surgical tools that can limit access to implant sites, mainly in posterior areas of the mouth in the presence of bulky anatomical structures and in patients with reduced mouth-opening capacity. The present paper aimed to present a novel approach to guided implant surgery, describing the technical characteristics of an innovative guided surgical kit made up of modified sleeves and modular surgical drills. The proposed guided surgical kit is based on a novel patented system of sleeves and modular burs, with an increased length of the metal sleeves and a reduced height of the drills. The innovative design of the proposed system would allow the clinician to position guided fixtures in all clinical situations; the reduced encumbrance would be particularly helpful to gain access to the posterior areas of both maxilla and mandible, which have limited inter-arch space, with an easy and user-friendly approach. The modular system could overcome anatomical limitations, such as reduced mouth-opening capacity, and permit clinicians to maintain the stability and integrity of the surgical templates, even in cases where there is very limited intermaxillary space.
Aims: The purpose of the study was to evaluate the accuracy of a three-dimensional (3D) automated technique (computer-aided design (aCAD)) for the measurement of three canine femoral angles: ...anatomical lateral distal femoral angle (aLDFA), femoral neck angle (FNA) and femoral torsion angle.Methods:Twenty-eight femurs equally divided intotwo groups (normal and abnormal) were obtained from 14 dogs of different conformations (dolicomorphic and chondrodystrophicCT scans and 3D scanner acquisitions were used to create stereolithographic (STL) files , which were run in a CAD platform. Two blinded observers separately performed the measurements using the STL obtained from CT scans (CT aCAD) and 3D scanner (3D aCAD), which was considered the gold standard method. C orrelation coefficients were used to investigate the strength of the relationship between the two measurements.Results: A ccuracy of the aCAD computation was good, being always above the threshold of R2 of greater than 80 per cent for all three angles assessed in both groups. a LDFA and FNA were the most accurate angles (accuracy >90 per cent).Conclusions: The proposed 3D aCAD protocol can be considered a reliable technique to assess femoral angle measurements in canine femur. The developed algorithm automatically calculates the femoral angles in 3D, thus considering the subjective intrinsic femur morphology. The main benefit relies on a fast user-independent computation, which avoids user-related measurement variability. The accuracy of 3D details may be helpful for patellar luxation and femoral bone deformity correction, as well as for the design of patient- specific, custom-made hip prosthesis implants.
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FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The objective of the present study was to observe the effect of positioning of the mandible on the accuracy of cross-sectional images obtained by reformatting computerized tomographic (CT) scans. An ...additional aim was to evaluate the ability of a software program (DentalVox, Era Scientific) to reconstruct these measurements on the reformatted images, regardless of the positioning of the mandible, accurately and without distortion. The test was carried out by examining a partially edentulous dry human mandible with an acrylic radiologic template. Through the use of an acrylic glass support, the mandible was positioned at angles of 0, 10, 15, 20, and 30 degrees relative to the scanning gantry, and a series of CT scans was performed that provided five sets of axial images. Each set of original axial images was reformatted by the DentalVox software, used first in its basic function, which is typical of all software for axial CT measurement (control group), and again in its function of site-specific multiplanar reconstruction (test group). The results showed that the position of the mandible in relation to the CT gantry can influence the precision of the linear measurements. The error ranged from 2% to 51%. The DentalVox software allowed the reconstruction of cross-sectional images with very little distortion regardless of the mandibular position.
Inter-Frequency Handover (IFHO) is the procedure accounting for the handover of User Equipment (UE) from a serving frequency layer to another. Its proper functioning depends on a plethora of ...parameters' settings and it is one of the most important aspects affecting the overall UE-perceived performance. The proposed work tackles an optimization procedure for IFHO in Long Term Evolution (LTE)/5G networks. A two-step algorithm based on network Key Performance Indicators (KPIs) processing is designed and presented in detail. Performance assessment is based on the capability of the algorithm to increase network throughput while avoiding degrading behaviors such as ping-pong effects, augmented inter-Radio Access Technology (RAT) handovers, and outage conditions. The algorithm was tested on TIM's network infrastructure over the period August 2020 - January 2021 and it turned out to considerably increase performance with respect to an approach based on standard parameters setting.
This clinical report describes a device (Centrascan) used to assist in the correct alignment of the patient's head during computed tomography (CT) assessment of a proposed implant site. To obtain the ...desired anatomic detail, CT requires precise alignment of the axial images at right angles to the long axis of the proposed implant. This clinical report compared the anatomic morphology of a projected implant site derived from axial images provided by DentaScan software analysis of the CT scan acquisition. Images from a conventional scan, with the patient's head aligned along the frontal plane (perpendicular to the Frankfort plane) and along the sagittal plane (coinciding with either the cortical bone of the hard palate or the inferior border of the mandible), were compared with images acquired by use of the Centrascan device. The two scans differed substantially. In particular, the cross-sectional images obtained by the conventional procedure showed a distorted anatomy; conversely, the images obtained by the Centrascan procedure showed a better reproduction of the examined area. The Centrascan device seemed to help the radiologist achieve a more correct alignment of the patient's head during CT scan acquisition. Further studies are necessary to fully explore the relative technical merits of the Centrascan device. (J Prosthet Dent 2003;89:123-6.)
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The aim of this work was to outline the systematic error in the measurement of height and width of the edentulous crests using the conventional radiographic program (Denta Scan) versus a software ...technique (Dental Vox) which allows us to avoid the aforementioned geometrical error.
The Department of Engineering of the University of Ferrara carried out an analysis of 26 tomographic scan corresponding to 104 implant sites, of which 73 are in the maxilla and 31 in the mandible, obtained by means of conventional reference axes (ANS-PNS for the upper jaw and mandibular border for the lower jaw) and reformatted by Denta Scan and Dental Vox.
This work reveals an error percentage of 10.49% (min. 0.1%–max 22.2%).
The results obtained demonstrate that the volume-averaging error inherent to CT reconstructed in relation to incorrect reference planes introduces a significant error in measurement and in morphology, which determines a negative outcome in a correct preoperative diagnosis and treatment planning regarding osseointegrated implants (measures and orienting).
Dental Vox, on the other hand, was shown to be efficacious in the correction of errors.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Automation plays a fundamental role in modern industry as regards productivity, quality and quantity of products and working conditions. Therefore a close connection between productivity and ...technological requirements should be established. Trends in industrial automation will be focused before proposing a new professional training and education in this topic. Moreover, economic benefits will be related to the evolution in plant automation.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Background
Although frequently considered a benign condition, new evidence has shown that mitral valve prolapse (MVP) is associated with complex ventricular arrhythmias (VAs) and sudden cardiac death ...(SCD). Therefore, we conducted a systematic review and meta‐analysis of the relevant studies to investigate the parameters that could identify MVP patients at higher risk of experiencing complex VAs.
Method
We performed a systematic literature search of PubMed for potential studies between January 2010 and January 2021. Our meta‐analysis included studies comparing MVP patients with complex VAs (A‐MVP) and those without (NA‐MVP). We used the fixed‐effects model to obtain the odds ratio (OR), risk ratio (RR), or mean difference (MD) and 95% confidence interval (CI) for each analyzed parameter.
Results
Six studies with 848 individuals were included in the meta‐analysis. As compared to the NA‐MVP patients, A‐MVP patients had a higher prevalence of inverted T‐wave (OR: 2.73; 95% CI: 1.85‐4.02; p < .00001) and longer QTc interval on the resting ECG (MD: 14.73; 95% CI: 9.39‐20.08; p < .00001), longer anterior mitral leaflet length (MD: 2.67; 95% CI: 2.02‐3.31; p < .00001), bi‐leaflet prolapse (OR: 1.65; 95% CI: 1.22‐2.24; p = .001), and mitral annulus disjunction (MAD) on echocardiogram (RR: 1.90; 95% CI: 1.50‐2.40; p < .00001), and late gadolinium enhancement (LGE) on cardiac magnetic resonance (RR: 4.38; 95% CI: 1.77‐10.86; p = .001).
Conclusion
Our comprehensive meta‐analysis suggests that risk factors related to A‐MVP are T‐wave inversion, longer QTc interval, bi‐leaflet prolapse, longer anterior mitral valve leaflet, MAD, and LGE.
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BFBNIB, DOBA, FSPLJ, FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VSZLJ
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