196,339 research outputs found
L'invenzione dello "zingaro" tra Medioevo ed età moderna: una ricognizione storico-letteraria
No full textUse of mouth guard in basketball: observational study of a group of teenagers with and without motivational reinforcement
No full textAim This study aims at ascertaining the capacity of
2 groups of young athletes to be faithful to the initial
oral prevention project, with the difference that the
study group received motivational reminders by either
researchers and technical staff members of the team
during the observation period, while the control group
did not receive any motivational reminders.
Materials and methods This observational study
was based on two groups selected from a wide group
of 150 adolescent basketball players who accepted
to use a custom-made mouth guard during their
sport sessions. None of the selected athletes (60
adolescents aged between 12 and 15 years ) had ever
worn a mouth guard during their sports activity. A
customised mouth guard was supplied, and subjetcs
were requested to wear it for 12 months during
training sessions and competitions. The study group
was composed of 30 athletes, 15 males and 15 females,
who received a constant motivational reinforcement to
the use of the mouth guard by their coach and during
checkups. Similarly, the control group was composed
of 30 athletes (15 males and 15 females) who did not
receive any motivational reinforcement.
Results Twelve months after the beginning of the
study, 24 subjects belonging to the control group werenot using the mouth guard, while only 7 subjects of
the study group were not using it. It was also noticed,
six months after the beginning of the observation
period, a rapid decline in the participants’ interest in
the use of the mouth guard.
Conclusion No traumatic event was registered
among those adolescents who had used the mouth
guard for the whole period of the study. Female
athletes showed greater compliance to this prevention
project. It is important that all technical staff members,
and particularly the leading coach, encourage the
regular use of oral protection device
Prosthetic rehabilitation interventions in adolescents with fixed bridges: a 5-year observational study
No full textAbstract
AIM:
The aim of this work is to verify the rate of success and failure causes of 32 FRC-FPD (Fiber Reinforced Composite Fixed Partial Dentures) placed on 30 adolescents with dental agenesis, over a follow-up period of 5 years.
MATERIALS AND METHODS:
Our study sample involved 30 subjects (10 males and 20 females) aged between 13 and 17 years who have been rehabilitated with FRC Maryland bridges to treat agenesis of maxillary incisors (for a total of 32 FRC-FPD). The observational study spans 5 years following the general rules coded by the modified United States Public Health Service (USPHS) system.
RESULTS:
After 5 years of follow-up of a sample of 32 FRC-FPD bridges, 30 were still in effective use (so 2 were excluded). All the bridges were FRC, replacing a missing lateral incisor, and had a double wing retention. All requirements of stability, peripheral seal and morphology preservation were well satisfied. The two failed bridges had a structural failure after about two years from placement.
DISCUSSION AND CONCLUSION:
In adolescents our orientation about the edentulous rehabilitation is towards solutions that, when possible, provide an acceptable aesthetic and functional restoration with fixed partial dentures, or removable dentures in cases of severe oligodontia. Obviously, techniques involving the placement of dental implants before the end of skeletal growth were never adopted. In our study FRC bridges showed a great functional performance and good compliance from young patients. Considering the positive cost-benefit ratio and the reversibility of the treatment in case of failure, such interventions can be considered a highly reliable early rehabilitation. Further studies are necessary to verify the maintenance requirements tested for longer periods
Studio clinico osservazionale sull' uso di ponti Maryland in composito rinforzato con fibre(FRC):successi e fallimenti in cinque anni.
No full textAbstrac t
Objectives. This observational study
aims to clinically verify the rate of success
of Fixed Partial Dentures (FPDs) made of
resin and glass fiber composite (Fiber-
Reinforced Composite, FRC).
Materials and methods . Our study
sample involved 50 subjects (30 males
and 20 females) aged between 14 and
45 who have been rehabilitated with
FRC Maryland bridges (for a total of 67
FPD-FRC). The observational study was
performed for five years following the
general rules coded by the modified US
Public Health Service (USPHS) system.
Resu lts. After five years of follow-up,
seven out of 67 prosthesis (five belonging
to the adult group and two belonging
to the adolescent group) were found
unsuitable. Four of these FPD-FRCs were
considered unsuitable because of break of
the framework, the remaining three FPDFRCs
were regarded unsuitable because
of leakage of the marginal seal.
Conclus ions. This clinical investigation
showed that the FPDs made with
FRC technique can be considered a viable
alternative to the traditional removable
and fixed prosthesis
Use of mouth guard in basketball: observational study of a group of teenagers with and without motivational reinforcement
No full textAIM: This study aims at ascertaining the capacity of 2 groups of young athletes to be faithful to the initial oral prevention project, with the difference that the study group received motivational reminders by either researchers and technical staff members of the team during the observation period, while the control group did not receive any motivational reminders.MATERIALS AND METHODS: This observational study was based on two groups selected from a wide group of 150 adolescent basketball players who accepted to use a custom-made mouth guard during their sport sessions. None of the selected athletes (60 adolescents aged between 12 and 15 years) had ever worn a mouth guard during their sports activity. A customised mouth guard was supplied, and subjetcs were requested to wear it for 12 months during training sessions and competitions. The study group was composed of 30 athletes, 15 males and 15 females, who received a constant motivational reinforcement to the use of the mouth guard by their coach and during checkups. Similarly, the control group was composed of 30 athletes (15 males and 15 females) who did not receive any motivational reinforcement.RESULTS: Twelve months after the beginning of the study, 24 subjects belonging to the control group were not using the mouth guard, while only 7 subjects of the study group were not using it. It was also noticed, six months after the beginning of the observation period, a rapid decline in the participants' interest in the use of the mouth guard.CONCLUSION: No traumatic event was registered among those adolescents who had used the mouth guard for the whole period of the study. Female athletes showed greater compliance to this prevention project. It is important that all technical staff members, and particularly the leading coach, encourage the regular use of oral protection devices for prevention among teenagers practicing sports
An evaluation of compliance in the use of mouth protection devices (Mgs) in a group of young athletes
No full textIntroduction: The use of mouth guards is strongly recommended in a number of sports, and there are numerous works in the relevant literature that stress the effectiveness and importance of using personal Mouth Guards (M.Gs.) It is also common knowledge that persuading people, especially young children, to use these protective devices regularly is not an easy task.
Aim:This study has aimed to establish whether or not the use of an electronic system measuring frequency of use, installed directly in the Mouth guard, will encourage young sportspeople to use these devices without the need for continuous motivational reinforcement The appliance used is known as Thera Mon and is a Class I Medical Device. Thera Mon is an electronic system which provides constant documentation of the actual wearing time of removable appliances.
Materials and methods: We carried out a preliminary observational study on the behavior manifested by a group of 12 young males who wore mouth guards equipped with the electronic measuring system four times a week for nine months, without any external motivational reinforcement being provided. The procedure used to produce the mouth-guards was the traditional Tecnica Erkodent for the Medium three-layer model of the Play safe teeth-guard line.
Results: We found that all the young sports-people had remained in the screening program. Specifically, 7 participants had continued to use their mouth guards regularly (4 times a week), 3 had used their devices not more than three times a week and 2 used theirs only during competition events.
Conclusion: These findings show that the use of these devices does not influence participants’ attitude to wearing them. Indeed, they demonstrated a willingness to use them regularly and we believe that particularly in the case of young children who practice sports, it is a method that can replace or provide a valid alternative to the established motivational reinforcement methods that may at times be unreliable
Gas lines from the 5-Myr old optically thin disk around HD141569A. Herschel observations and modeling
No full textThe authors thank ANR (contracts ANR-07-BLAN-0221 and ANR-2010-JCJC-0504-01) and PNPS of CNRS/INSU, France for support. W.F.T., I.K., and P.W. acknowledge funding from the EU FP7-2011 under Grant Agreement No. 284405 (PERG06-GA-2009-256513). F.M. acknowledges support from the Millenium Science Initiative (Chilean Ministry of Economy), through grant “Nucleus P10-022-F”. Computations presented in this paper were performed at the Service Commun de Calcul Intensif de l’Observatoire de Grenoble (SCCI) on the super-computer Fostino funded by Agence Nationale pour la Recherche under contracts ANR-07-BLAN-0221, ANR-2010-JCJC-0504-01 and ANR-2010-JCJC-0501-01. C. Eiroa, G. Meeus, and B. Montesinos are partly supported by Spanish grant AYA 2011-26202.Context. The gas- and dust dissipation processes in disks around young stars remain uncertain despite numerous studies. At the distance of ~99–116 pc, HD 141569A is one of the nearest HerbigAe stars that is surrounded by a tenuous disk, probably in transition between a massive primordial disk and a debris disk. Atomic and molecular gases have been found in the structured 5-Myr old HD 141569A disk, making HD 141569A the perfect object within which to directly study the gaseous atomic and molecular component. Aims. We wish to constrain the gas and dust mass in the disk around HD 141569A. Methods. We observed the fine-structure lines of O i at 63 and 145 μm and the C ii line at 157 μm with the PACS instrument onboard the Herschel Space Telescope as part of the open-time large program GASPS. We complemented the atomic line observations with archival Spitzer spectroscopic and photometric continuum data, a ground-based VLT-VISIR image at 8.6 μm, and 12CO fundamental ro-vibrational and pure rotational J = 3–2 observations. We simultaneously modeled the continuum emission and the line fluxes with the Monte Carlo radiative transfer code MCFOST and the thermo-chemical code ProDiMo to derive the disk gas- and dust properties assuming no dust settling. Results. The models suggest that the oxygen lines are emitted from the inner disk around HD 141569A, whereas the [C ii] line emission is more extended. The CO submillimeter flux is emitted mostly by the outer disk. Simultaneous modeling of the photometric and line data using a realistic disk structure suggests a dust mass derived from grains with a radius smaller than 1 mm of ~2.1 × 10-7M⊙ and from grains with a radius of up to 1 cm of 4.9 × 10-6M⊙. We constrained the polycyclic aromatic hydrocarbons (PAH) mass to be between 2 × 10-11 and 1.4 × 10-10M⊙ assuming circumcircumcoronene (C150H30) as the representative PAH. The associated PAH abundance relative to hydrogen is lower than those found in the interstellar medium (3 × 10-7) by two to three orders of magnitude. The disk around HD 141569A is less massive in gas (2.5 to 4.9 × 10-4M⊙ or 67 to 164 M⊕) and has a flat opening angle (<10%). Conclusions. We constrained simultaneously the silicate dust grain, PAH, and gas mass in a ~5-Myr old Herbig Ae disk. The disk-averaged gas-to-dust-mass is most likely around 100, which is the assumed value at the disk formation despite the uncertainties due to disagreements between the different gas tracers. If the disk was originally massive, the gas and the dust would have dissipated at the same rate.Peer reviewe
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