1,523 research outputs found
Intersubjective comparisons are possible with an accurate use of the Borg CR scales.
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Int J Sports Physiol Perform. 2010 Sep;5(3):406-11
Nanopore formation induced by ion-implantation in Ge: optical properties
No full textSelf-ion implantation on bulk Ge induces the formation of nanopores,
and their growth, structure and transport properties have been recently reported
[1]. Semiconductors containing nanopores have gained a renewed interest as
they are able to adsorb and interact with atoms and molecules and can thus be
used in several interesting and emerging applications. In this contribution we
report on the influence of ion implantation and subsequent nanopore formation
on optoelectronic properties of Ge samples. The analyses are carried out by
Surface Photovoltage (SPV) Spectroscopy, a powerful technique to get detailed
information on material optical properties [2]. Different nanoporous (np)
structures have been investigated: crystalline and amorphous np-Ge obtained
by implantation of bulk Ge, as well as crystalline and amorphous np-Ge obtained
by ion implantation of Ge film grown on Si substrates by molecular beam
epitaxy and sputtering. Changes in the SPV spectra as a function of ion
implantation fluence and annealing treatments are discussed on the basis of the
structural properties of the samples. Quantum confinement effects in
nanoporous Ge film have been demonstrated, while a significant SPV
enhancement in np-Ge samples decorated with Au nanoparticles has been
shown. These results can be of major interest for future photovoltaic
applications of thin film solar cells. G Impellizzeri et al Nanotechn 23, 395604
(2012) L Kronik and Y. Shapira, Surf Sci Rep. 37,1 (1999
La leggenda del corridore africano : riusciranno gli atleti italiani a tornare al vertice delle competizioni nel mezzofondo?
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Association between the temporomandibular joint disc position on magnetic resonance imaging and the mandibular deviation on posteroanterior cephalogram: a cross-sectional study in adolescents
No full textObjective. The aim of this cross-sectional research was to analyze the association between the disc position of the temporomandibular joint (TMJ) evaluated by magnetic resonance imaging (MRI) and the mandibular deviation evaluated by posteroanterior cephalometric (PA) in adolescents. Materials and Methods. The sample was 53 adolescents aged 11-18 years. This cross-sectional study was based on the analysis of PA and bilateral TMJ MRI images retrospectively selected. The mandibular deviation was evaluated by PA and defined by the amount of menton (Me) deviation from the midsagittal reference line. The temporomandibular disc position was evaluated by MRI: normal (N), disc displacement with reduction (DDR) and disc displacement without reduction (DDNR). The DDNR was considered more severe than the DDR. The patients were classified into three groups based on the bilateral disc position: group I, the same bilateral disc position; group II, disc displacement more severe on the ipsilateral side of the menton deviation; group III, disc displacement more severe on the contralateral side of the menton deviation. ANOVA followed by post hoc Tukey’s test was used to evaluate the interaction between the menton deviation and the bilateral disc position. Results. There was an association statistically significant between the bilateral disc position and the Me deviation (p<0.05). There were significant differences in the mean of the menton deviation between group II (4,40 ±2,26), and group I (2,17±1,93) and III (2,10±1,70). Conclusions. the menton deviation was significantly correlated with the disc position in the TMJ exhibit more deflection to the side more affected
New approaches in ortho-surgical treatments with stimulate & innovative technology
No full textThe aim of this study is to show the effectiveness of laser technology for the exposure of the palatally impacted canines, using a CO2 laser device (Smart US20D®, DEKA - Florence, Italy) and Diodi Laser device (Raffaello, DMT, Lissone, Italy, 980nm +645nm), which can stimulate the spontaneous eruption of the canine, without orthodontic traction application. Moreover, the purpose of this study is to monitor the movement of the impacted tooth after exposure with laser approach with digital technologies.
Another aspect of this study is focused on the differences between digital monitoring through scanner and conventional monitoring which is based exclusively on the clinical evaluation of the photos and the study of the plaster casts.
The final experimental sample was constituted of 18 patients, 9 females and 9 males; of these 8 patients showed a bilateral inclusion and 10 a mono-lateral inclusion of the canine, for a total of 26 canines. To demonstrate the validity of the technique applied to the study group, a CONTROL GROUP, which included 9 patients with unilateral and bilateral palatally impacted canines (in total 13 canines), treated by a traditional surgical-orthodontic approach, was observed.
This experimental project was conducted in order to evaluate the effectiveness of laser surgery as an alternative approach to conventional surgical-orthodontic treatment.
After laser exposure, no orthodontics treatment was initiated until the impacted tooth had erupted sufficiently into the palate and the autonomous eruption capacity was assessed.
The spontaneous eruption was quantified by measuring the millimeter distance between the cusp of the canine one week after surgery (released from the overlying mucous and bone tissues) and the cusp of the same after 16 weeks from laser surgery.
Of the 26 canines under study all of them performed a movement between 2,72 mm and 7,04 mm (mean value: 5,01 mm).
Therefore, we can state that, at the end of the evaluation period of 16 weeks, a significant teeth movement was observed. Furthermore, the exposure of part of the dental crown, allowed, in all cases treated, to apply a bracket or a button to align the tooth in the dental arch.
Our data suggests that the response of the dental element to the bio-stimulant action of the laser, applied to expose their crown, can be considered effective.
Of the values obtained, the ones most distanced from the mean value were considered (the highest values 6,9 and 7,04 and the minimum values 2,72 and 3,12) and the type of inclusion of treated canines to which they refer was evaluated.
The four values correspond to canines in bone inclusion; in particular, the millimetric value 7,04 corresponds to a deep inclusion canine.
Therefore, from what emerges from our study, no significant correlation was found between the extent of spontaneous eruption (in mm) and the type of inclusion.
A further purpose of this study was the evaluation of the possible different action between the CO2 laser (wavelength: 10600 nm; power: 4.5 Watts) used in super-pulsed emission mode (that no have bio-stimulation capacity) and the diode laser (wavelength: 980 nm + 645 nm; power: 4 Watts) used in continuous wave emission mode.
Comparing the millimeters of eruption of the canines treated with the two different types of lasers and applying the Student’s T-Test, we found a super-imposable value.
Moreover, the study groups (group A and group B) and the control group were compared in terms of mean eruption time, respectively spontaneous or forced by means of a Crozat orthodontic device, activated monthly to allow the displacement of the canines .I n the control group the duration of the orthodontic traction is, on average, 10 months. In the study groups the canine eruption was spontaneous and occurred in an average period of 4 months. It can be stated that, although a forced orthodontic traction was applied in the control group to allow tooth eruption, the eruption times in the study groups were significantly lower. The results obtained indicate the effectiveness of the new approach proposed by us, although performed on a small sample of patients. The results are significant from different points of view.
The advantages found in this study are numerous. The main advantages of digital monitoring are the possibility of evaluating parameters that cannot be evaluated analogically and of making measurements of distances normally calculated on plaster casts with compass and rubber with the respective errors. Other advantages are represented by the reduction of work time, due to the abolishing of the need to request plaster casts to the dental technician. Which also means the reduction of the costs of the laboratory and it also means less costs for the patients.
By eliminating the steps of the analogue impressions and of the plaster casts, the details are certainly represented with more precision and accuracy and there is a minimum error accumulated. This digital workflow that is created is also managed entirely by a single person, which represents a further saving of time.
Moreover, we have clinical advantages, that are the less discomfort of the patient who does not tolerate the classic impressions in alginate and of the orthodontist, and the reduction of the chair time. The application of the digital technologies in the monitoring helps the orthodontist to make clinical decisions supported on measurable data and not just on clinical experience. The our ortho-surgical protocol with the use of different technologies set off to a new concept of work in dentistry, in particular, in the cases characterized by impacted teeth or cases that expect an orthodontic and surgical approach. Finally, a not indifferent aspect consists in the reduce of treatment time, which is an advantage for both the orthodontist and the patient. It is consequence of the reduction of the steps and work-time, and it is due to the real monitoring that can be performed on the patient
Epidemiological characteristic of Orofacial clefts and its associated congenital anomalies: retrospective study
No full textBackground: To evaluate the relationship between gender, ethnicity/citizenship, clinical phenotype, total prevalence, and the various congenital malformations associated with oral clefts (OC) in Italy across the period 2001-2014. Methods: A retrospective analysis (2001-2014) was conducted based on the National Congenital Malformation Registries network of Italy (Emilia-Romagna Registry of Birth Defects [IMER] and Registro Toscano Difetti Congeniti [RTDC]), which were analyzed to investigate time trends, geographical/ethnic clusters, topography, sex ratio, and associated congenital anomalies of OC phenotypes. Results: Among 739 registered cases, 29.8% were syndromic or had multi-malformed associated anomalies, compared with 70.2% having isolated orofacial cleft. Cleft lip (CL) was observed in 22%, cleft palate (CP) in 40%, and cleft lip and palate (CLP) in 38% of live births, stillbirths, and terminations of pregnancy for fetal anomaly cases. Other associated conditions were major anomalies of cardiovascular defects (39%), followed by defects of the limbs (28%), neuroectodermal defects (23%), and urogenital malformations (10%). Male-to-female sex ratio was 1:1.14 in CP, 1.22:1 in CL, and 1.9:1 in CLP. Foreigners were represented by 29% from Southeast Asia, 25% from Balkans, 25% from North-Central Africa, 9% from the East, 7% from Western Europe, and 5% from South America. Total prevalence of OC cases ranged from 0.9 (RTDC) to 1.1 (IMER) of 1000 births. Conclusions: This retrospective study provides a population-based, clinical-epidemiological description of the orofacial cleft phenomenon. As a relatively frequent congenital malformation, its social and economic impact is worthy of further study. These abnormalities can cause significant problems that may be solved or minimized by early diagnosis and treatment
Impact of tilt-down positioning compared with left lateral positioning on ease of colonoscope insertion during colonoscopy
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Relationship between push phase and final race time in skeleton performance
No full textThe aim of this study was to examine the relationship between push-time and final race time in skeleton participants during a series of major international competitions to determine the importance of the push phase in skeleton performance. Correlations were computed from the first and second heat split data measured during 24 men and 24 women skeleton competitions. Body mass, height, age, and years of experience of the first 30 men and women athletes of the skeleton, bobsleigh and luge 2003-2004 World Cup ranking were used for the comparison between sliding sports. Moderate but significant correlations (p < 0.05) were found between push-time and final race time in men (r(mean) = 0.48) and women (r(mean) = 0.63). No correlations were found between changes in the individual push-time between the first and second heat with the corresponding changes in final race time. The bobsleigh sliders are heavier than the athletes of the other sliding disciplines. Luge athletes have more experience and are younger than bobsleigh and skeleton sliders. The results of this study suggest that a fast push phase is a prerequisite to success in competition and confirms that the selection of skeleton athletes based on the ability to accelerate to a maximum speed quickly could be valid. However, a good or improved push-time does not ensure a placement in the top finishing positions. On the basis of these results, we suggest that strength and power training is necessary to maintain a short push-time but additional physical training aimed to enhance the push phase might not reflect performance improvements. The recruitment of younger athletes and an increase of youthful competitive activity may be another effective way to reach international competitive results
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