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774 results on '"Gambarini, G."'

2. THGEM operation in Ne and Ne/CH4

Author

Cortesi, M., Peskov, V., Bartesaghi, G., Miyamoto, J., Cohen, S., Chechik, R., Maia, J. M., Santos, J. M. F. dos, Gambarini, G., Dangendorf, V., and Breskin, A.

Subjects
Physics - Instrumentation and Detectors
Abstract

The operation of Thick Gaseous Electron Multipliers (THGEM) in Ne and Ne/CH4 mixtures, features high multiplication factors at relatively low operation potentials, in both single- and double-THGEM configurations. We present some systematic data measured with UV-photons and soft x-rays, in various Ne mixtures. It includes gain dependence on hole diameter and gas purity, photoelectron extraction efficiency from CsI photocathodes into the gas, long-term gain stability and pulse rise-time. Position resolution of a 100x100 mm^2 X-rays imaging detector is presented. Possible applications are discussed., Comment: Submitted to JINST, 25 pages, 33 figures

Published
2009
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8. ESE position statement on root resorption

Author

Patel, S. (Shanon), Krastl, G. (Gabriel), Weiger, R. (Roland), Lambrechts, P. (Paul), Tjäderhane, L. (Leo), Gambarini, G. (Gianluca), Teng, P.-H. (Peng-Hui), Patel, S. (Shanon), Krastl, G. (Gabriel), Weiger, R. (Roland), Lambrechts, P. (Paul), Tjäderhane, L. (Leo), Gambarini, G. (Gianluca), and Teng, P.-H. (Peng-Hui)

Abstract

This Position Statement on root resorption represents the consensus of an expert committee convened by the European Society of Endodontology (ESE). The statement is based on current clinical and scientific evidence as well as the expertise of the committee. The aim is to provide clinicians with authoritative information on the aetiology, histopathology, clinical presentation and recommendations for the management of root resorption. It is the intention of the committee to update this position statement at appropriate intervals as further evidence emerges.

Published
2023

26. Influence of different cross-section on cyclic fatigue resistance of two nickel–titanium rotary instruments with same heat treatment: An in vitro study

Author

Di Nardo, D., Gambarini, G., Seracchiani, M., Mazzoni, A., Zanza, A., Giudice, A., D'Angelo, M., and Testarelli, L.

Subjects
cross-section, lcsh:RK1-715, endodontics, heat treatment, nickel–titanium rotary instruments, nickel-titanium rotary instruments, lcsh:Dentistry, Cross-section, cyclic fatigue
Abstract

Introduction: The aim of this study was to investigate the role of the cross-sectional design surface in improving the cyclic fatigue resistance by comparing two nickel–titanium (NiTi) rotary instruments with the same heat-treatment and grinding procedure. Materials and Methods: A total of 40 new NiTi instruments (20 S-One 25.06 taper and 20 AF Blue S4 25.06 taper) were tested in the present study. Both instruments were rotated at 300 rpm and with a torque setting of 2 Ncm) using an endodontic motor in the same artificial canal (90° angle of curvature and 3 mm radius). A Student's t-test was performed to determinate the differences in terms of time to fracture (TtF) and the length of the fractured portion between the two different instruments. Significance was set at P < 0.05. Results: The differences in terms of TtF for cyclic fatigue resistance between the two files were statistically significant (P < 0.05). In terms of fractured length, not statistically significant differences were found (P > 0.05). Scanning electron microscopy images showed patterns of cyclic fatigue striations. Conclusion: The results of this study confirm and enhance the role of cross-section in increasing the cyclic fatigue resistance of NiTi rotary instruments.

Published
2020

27. The relevance of operative torque and torsional resistance of nickel-titanium rotary instruments: A preliminary clinical investigation

Author

Gambarini, G., Miccoli, G., D'Angelo, M., Seracchiani, M., Valenti Obino, F., Reda, R., and Testarelli, L.

Subjects
lcsh:RK1-715, torque range, Nickel-titanium instruments, torsional resistance, lcsh:Dentistry, operative torque, nickel–titanium instruments
Abstract

Introduction: The aim of the present study is to evaluate the torsional resistance and the operative torque of two different files and to introduce the concept of “torque range”, that indicates the difference between torque at failure and operative torque. Materials and Methods: 20 ProTaper Next® (PTN) X1 and 20 EdgeFile® X7 17.04 were randomly divided into two equal groups (n = 10) and were subjected to the following two tests: operative torque recorded during root canal shaping of a single-rooted mandibular premolar and a torsional test performed at 300 rpm while the apical 3 mm of each file were firmly secured. The torque range was calculated from the difference between “Operative torque” and “torque at fracture.” A statistical t-test was performed to determinate the difference. Statistical significance was set at P < 0.05. Results: EdgeFile X7 instruments reached the working length significantly faster and with less torque generated (P < 0.05) compared to PTN . In torsional static resistance (torque at failure), the two files demonstrated no significant different values (P > 0.05). The range between the mean values of maximum torque at failure and operative torque, “torque range,” was twice bigger for EdgeFile X7 instruments. Conclusions: The EdgeFile X7 has a wider “torque range” when compared to PTN X1. This new concept could be a relevant innovation to match in vivo and in vitro studies and to obtain a more clinically relevant result.

Published
2020

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