102 research outputs found
The Role of Stable Anatomical Landmarks in Automated 3D Model Superimposition: A Closer Look
No full textObjective: To evaluate the concordance of automated 3D superimposition methods applied to digital models, with a focus on methods that consider stable palatal regions as geometric reference landmarks versus those that do not. Design and setting: This was a prospective, cross-sectional study using digital model files of patients undergoing orthodontic treatment in a university clinical setting. Participants: Sixty-one patients were prospectively enrolled and divided into three groups based on the type of orthodontic treatment they received: (20) non-extractive orthodontic treatment without intermaxillary elastics, (21) intermaxillary elastics, and (20) control subjects with no orthodontic movement. The inclusion criteria included the availability of complete pre- and post-treatment digital casts and the absence of significant craniofacial anomalies. Methods: Three superimposition methods were tested: (1) superimposition according to palate and palatal ridges, (2) best-fit superimposition of arches in occlusion, and (3) best-fit superimposition of individual arches. Discrepancies were identified by comparing the spatial positions derived from each method. Within three spatial axes, deviations of +/- 0.5 mm and +/- 1.15 degrees were not considered significant. Bland-Altman plots were used to quantify palatal rugae based and non-based spatial differences between methods. Differences in the superimposition results between the three patient groups were evaluated using ANOVA tests. Results: Differences in spatial position between the superimposition methods often exceeded the acceptable range. The results were compared between the three patient groups with a statistical significance of alpha = 0.05. In the present study, the high reliability of the superimposition method based on the palate and palatal ridges was observed. Conclusion: Superimposition methods based on the palate and palatal rugae provide superior accuracy in determining treatment-related changes in upper arch digital models. These findings illustrate the need for appropriate selection of superimposition techniques based on the study objective of using clinically relevant techniques
Evaluation of the Dimensional Accuracy of 3D-Printed Aligners: An In Vitro Study Using Reverse Engineering Analysis
No full textBackground: This study aimed to investigate the dimensional deformation that can occur during the fabrication of a 3D-printed aligner made with the TC-85 DAC resin (Graphy Inc., Seoul, Republic of Korea) and determine if the manual removal of the print supports before final aligner curing affects the dimensional accuracy. Methods: 10 subjects with permanent dentition were selected, and a set of aligners was digitally designed using the uDesign Direct Aligner beta software (Graphy Inc., Seoul, Republic of Korea). Each aligner was 3D-printed using TC-85 DAC resin (Graphy Inc., Seoul, Republic of Korea) twice: one copy was produced removing the print supports before final curing, whereas the other was cured with the supports still attached. The aligners were digitized and compared to the original design of the digitally designed aligner using RMS and Inter-second molar distance data to identify variations between 3D-produced aligners and their respective digital design. Results: the comparison between aligners produced in two different ways was statistically significant with a p-value < 0.0001 for both the records used. Conclusions: the manual removal of the print supports before final curing affects the dimensional accuracy of aligners made by direct 3D printing, permanently altering the aligner’s internal geometry, confirming that post-processing conditions significantly affect dimensional stability
Samuele R. Bacchiocchi and Family
No full textSeventh-day Adventist author and theologian, Samuele R. Bacchiocchi and his wife and their children at a graduation ceremony at Pontifical University
sd920/FIJI-macros-for-IHC-and-SHG-analysis: Batch Split Channels (3 channels)
No full textThis macro allows to split channels for Z-stack .tiff files and save them in a new folder in batch mode.
Author: Samuele Di Carmine, [email protected]
Version 1.0
July 13, 2021
//License: BSD3
Copyright 2021 Samuele Di Carmine, Imperial College Londo
Effect of print orientation of 3D-printed aligner templates on the volumetric accuracy of transferred composite attachments: an in vitro study
No full textObjectives
This study aimed to evaluate the effect of print orientation on the dimensional accuracy of attachments in directly 3D-printed orthodontic aligners.
Materials and methods
For n = 10 patients, 34 single-tooth aligner segments were digitally designed (17 for tooth 1.1 and 17 for tooth 1.6) incorporating a planned 3 mm horizontal rectangular buccal attachment. These aligners were printed in TC-85 DAC resin (Graphy Inc, Seoul, Korea) at different inclinations (8 in anterotation and 8 in postrotation, at 10° intervals from the horizontal) and used as templates to transfer attachments onto corresponding 3D-printed dental models. This models with transferred attachments were scanned with a laboratory scanner and superimposed onto the attachment surface of the master digital file. Percentage volume deviations of the transferred versus planned attachment were quantified using Geomagic Control software (v.2020.1.1, ©2020 3D Systems, Inc., Rock Hill, SC) and analysed with an unpaired two-tailed t-test (P < 0.05).
Results
For tooth 1.1, the mean volumetric deviation of transferred attachments was significantly lower in postrotation orientations (88.87% ± 4.13) than in anterotation (69.01% ± 4.33), indicating that positioning the template with the vestibular surface facing the build platform improves accuracy (p < 0.0001). For tooth 1.6, no statistically significant difference was found (p = 0.0992; 78.16% ± 2.26 vs. 79.99% ± 1.87).
Conclusions
Composite attachments transferred with 3D-printed templates exhibited a volumetric alteration respect the master digital file and print orientation particularly affects anterior teeth’s attachments.
Clinical relevance
Aligners orientation during 3D-printing is crucial to ensure accurate attachments transfer, especially anterior regions
Samuele R. Bacchiocchi
No full textSamuele R. Bacchiocchi was a Seventh-day Adventist author and theologian best known for his work on the Sabbath in Christianity, particularly in the historical work "From Sabbath to Sunday," based on his doctoral thesis from the Pontifical Gregorian University. Bacchiocchi defended the validity of the Feasts of the Lord, situated in Leviticus 23. He wrote two books on the subject. He was also known within the Seventh-day Adventist church for his opposition to rock and contemporary Christian music, jewelry, the celebration of Christmas and Easter, certain dress standards, and alcohol. This photograph was taken during a graduation ceremony from Pontifical University
The Impact of the COVID-19 Emergency on Local Vehicular Traffic and Its Consequences for the Environment: The Case of the City of Reggio Emilia (Italy)
No full textfirst_pagesettings
Open AccessArticle
The Impact of the COVID-19 Emergency on Local Vehicular Traffic and Its Consequences for the Environment: The Case of the City of Reggio Emilia (Italy)
by Samuele Marinello 1,*OrcID,Francesco Lolli 1,2 andRita Gamberini 1,2OrcID
1
En&Tech Interdepartmental Center, University of Modena and Reggio Emilia, 42124 Reggio Emilia, Italy
2
Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 42122 Reggio Emilia, Italy
*
Author to whom correspondence should be addressed.
Sustainability 2021, 13(1), 118; https://doi.org/10.3390/su13010118
Received: 3 December 2020 / Revised: 21 December 2020 / Accepted: 22 December 2020 / Published: 24 December 2020
(This article belongs to the Special Issue 8th World Sustainability Forum—Selected Papers)
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Abstract
The COVID-19 health emergency has imposed the need to limit and/or stop non-essential economic and commercial activities and movement of people. The objective of this work is to report an assessment of the change in vehicle flows and in air quality of a specific study area in the north of Italy, comparing the periods February–May 2020 and February–May 2019. Circulating vehicles have been measured at nine characteristic points of the local road network of the city of Reggio Emilia (Italy), while atmospheric pollutant concentrations have been analysed using data extracted from the regional air quality monitoring network. The results highlight a rapid decline in the number of vehicles circulating in 2020 (with values of up to −82%). This has contributed to a reduction in air concentrations of pollutants, in particular for NO2 and CO (over 30% and over 22%, respectively). On the other hand, O3 has increased (by about +13%), but this is expected. Finally, the particulate matter grew (about 30%), with a behaviour similar to the whole regional territory. The empirical findings of this study provide some indications and useful information to assist in understanding the effects of traffic blocking in urban areas on air quality
A Comparison Between the Expansion Force Exerted by Thermo-Printed Aligners and 3D Printed Aligners: An In Vitro Study
No full textBackground: The fabrication of orthodontic aligners directly via three-dimensional (3D) printing presents potential to increase the efficiency of aligner production relative to traditional workflows; however, several aspects of the 3D printing process might affect the dimensional fidelity of the fabricated appliances. The aim of this study is to measure the forces expressed by a 3D printed aligner made with TC-85 DAC resin (Grapy Inc., Seoul, Republic of Korea) when an expansion movement of the entire upper dental arch is programmed, comparing the measured forces with those obtained by a common thermoformed aligner (Smart Track®, Align Technology, Santa Clara, CA, USA). Materials and methods: A patient in transitional mixed dentition was selected, with the presence of all the first molars and permanent upper and lower incisors, and the canines and premolars have not started the exchange. From this patient, a virtual set up of the upper arch has been planned with an expansion of 0.2 mm and 0.4 mm per side; 3 mm horizontal rectangular attachments were added to the set up on the vestibular surface of the permanent molars, deciduous premolars, and deciduous canines. On this set up, 10 Smart Track aligners and 10 3D printed aligners with TC-85 DAC resin were produced. The fabricated aligners were mounted on the machinery used for the test (ElectroForce® Test Bench; TA Instruments, New Castle, DE, USA) by means of specific supports that simulate the upper arch of the patient (divided into two sides: right and left). To simulate the intraoral environment, the measurements were carried out in a thermostatic bath at a temperature of 37 °C. Results: The key results of this paper showed differences between Smart Track® and TC-85 DAC. In particular, the expanding force exerted by the 0.2 mm per side expanded Smart Track® aligners was on average +0.2162 N with a D.S. of ±0.0051 N during the 8 h; meanwhile, the force exerted by the 0.2 mm per side expanded TC-85 DAC 3D printed aligners was on average −0.0034 N with a D.S. of ±0.0036 N during the 8 h. The force exerted by the 0.4 mm per side expanded Smart Track® aligners was on average +0.7159 N with a D.S. of ±0.0543 N during the 8 h; meanwhile, the force exerted by the 0.4 mm per side expanded TC-85 DAC 3D printed aligners was on average +0.0141 N with a D.S. of ±0.004 N during the 8 h. Conclusions: Smart Track® aligners express a quantitatively measurable force in Newtons during the programmed movements to obtain a posterior expansion of the dental arches; on the contrary, aligners made with TC-85 DAC resin, in light of the results obtained from this study, express forces close to 0 during the realization of the movements programmed to obtain a posterior expansion of the dental arches
L'Alcesti di Samuele di Alberto Savinio: studio dell'opera e confronto con l'Alcesti di Euripide
No full textLa tesi si propone di confrontare l’Alcesti di Euripide, tragedia greca messa in scena nel 438 a.C. e l’Alcesti di Samuele di Alberto Savinio, rappresentata per la prima volta al Piccolo Teatro di Milano nel 1950. Il primo capitolo fornisce informazioni biografiche sull’autore. Il secondo capitolo raccoglie e descrive gli interventi sulla figura di Alcesti pubblicati da Savinio sui giornali ed esamina le fonti dell’opera teatrale. Il terzo capitolo è dedicato all’illustrazione delle due opere. Nel quarto capitolo si procede all’analisi e al confronto. Nell’ultimo capitolo si presentano alcune considerazioni sul metateatro, sulla trama, sui personaggi e sui temi principali dell’Alcesti di Samuele.
The aim of this work is to compare the Greek tragedy Alcesti by Euripides, performed on stage in 438 B.C., with the Alcesti di Samuele by Alberto Savinio, first performed at the Piccolo Teatro in Milan in 1950. The first chapter provides biographical information about the Author. The second chapter collects and describes the works about the character of Alcesti published by Savinio on newspapers and examines the sources of the play. The third chapter is about the description of the two works. The fourth chapter contains their analysis and comparison. In the last chapter some considerations about metatheatre and about the plot, the characters and the main themes of the Alcesti di Samuele are carried out
Samuele R. Bacchiocchi
No full textSamuele R. Bacchiocchi was a Seventh-day Adventist author and theologian, best known for his work on the Sabbath in Christianity, particularly in the historical work "From Sabbath to Sunday," based on his doctoral thesis from the Pontifical Gregorian University. Bacchiocchi defended the validity of the Feasts of the Lord, situated in Leviticus 23, he wrote two books on the subject. He was also known within the Seventh-day Adventist church for his opposition to rock and contemporary Christian music, jewelry, the celebration of Christmas and Easter, certain dress standards, and alcohol. Bacchiocchi earned a Bachelor of Arts degree in theology from Newbold College in England, which was followed by a Master of Arts and Bachelor of Divinity at Andrews University in Michigan, United States in 1964. Bacchiocchi moved with his wife Anna to Kuyera, Shashamane district, Ethiopia, where he lectured in Bible and history. Bacchiocchi taught in the religion department of Andrews University from 1974 until his retirement in 2000. He taught theology and church history. He regularly presented seminars worldwide, and wrote many self-published books and articles on biblical topics. He was married to Anna Gandin Bacchiocchi. They had three children
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