1,722,132 research outputs found
Implant survival after sinus elevation with Straumann(®) BoneCeramic in clinical practice: ad-interim results of a prospective study at a 15-month follow-up.
No full textAbstract: Objectives
Elevation of the sinus floor with Straumann (R) BoneCeramic gave promising results in some recent clinical studies. However, no study has evaluated the long-term survival of implants after this surgical procedure. We are conducting a prospective, observational study to evaluate the long-term implant survival after this surgical procedure in clinical practice. We present here an ad-interim report of this study, including only patients with >= 12-month follow-up after implant placement.
Methods
This prospective cohort study will last until a follow-up of 5 years will be achieved in at least 50 patients. Inclusion criteria are: age >= 18 years; presence of a maxillary partial unilateral or bilateral edentulism involving the premolar/molar areas; elective rehabilitation with oral implants; and physical capability to tolerate conventional surgical and restorative procedures. Patients are treated according to the two-stage technique and the preparation is filled with Straumann (R) BoneCeramic. Implant survival is evaluated every 3 months for the first 2 years, and then every 6 months up to 5 years.
Results
Fifteen patients are considered in this ad-interim analysis. Mean follow-up was 14.9 +/- 3.1 (range: 6-18 months). In total, three implants failed, in one single patient, 6 months after insertion. The cumulative implant survival rate was 92.5% (95% confidence interval: 83.0-100%).
Conclusions
This ad-interim analysis suggests that the elevation of the sinus floor with Straumann (R) BoneCeramic may be an effective clinical option over > 1-year follow-up. A longer term follow-up will allow a deeper characterization of these preliminary findings
To cite this article:Covani U, Orlando B, Giacomelli L, Cornelini R, Barone A.Implant survival after sinus elevation with Straumann (R) BoneCeramic in clinical practice: ad-interim results of a prospective study at a 15-month follow-up.Clin. Oral Impl. Res. 22, 2011; 481-484doi: 10.1111/j.1600-0501.2010.02042.x
Cronache di un'eruzione: la nascita di Monte Nuovo nel 1538
No full textDal 1500 numerosi segnali macroscopici anticiparono l’eruzione del 1538. Una nuova forte crisi sismica avvenne
nel 1537-1538, con il culmine nella notte fra il 28 e 29 settembre 1538 nell’area dove poi sarebbe cresciuto Monte Nuovo. L’eruzione non fu particolarmente violenta, ma ebbe grande ripercussione sull’economia e
sul tessuto sociale dell’area
Absorption, metabolism and protective role of fruits and vegetables polyphenols against gastric cancer
Full text linkGrowing evidence links free radicals to the aging processes, degenerative diseases and cancer, underlying the important role played by some antioxidants, as polyphenols, present in fruits and vegetables, which seem able to counteract the toxic effects induced by oxidative stress. The gastrointestinal tract is continuously exposed to oxidant and antioxidant substances and, in particular in this district, the food rich in antioxidants could exert a protective effect against the risk of cancer. Polyphenols have a direct protective effect on the gastrointestinal tract, detoxifying the Reactive Oxygen Species (ROS) and Reactive Nitrogen Species (RNS), preserving antioxidant proteins and complexing metals. Although polyphenols are a class of antioxidant largely represented in vegetables and fruits, we are still uncertain whether the beneficial effects of a diet rich in plant products, are mainly due to these compounds. Our knowledge does not allow to be sure about which antioxidants are capable of having therapeutic effects, through which mechanism, the exact therapeutic dose or how long they have to be taken to have a significant protective effect. In this review we take into account the most common antioxidants, usually found in the diet and the processes regulating their absorption, metabolism and excretion, in order to elucidate the mechanism that could be responsible for the protection against cancer
Vesuvius, Pompei, Herculaneum: a lesson of natural history
No full textThe eruption of Mount Vesuvius of 79 AD destroyed the cities of Pompeii and Herculaneum, but preserved them from the deterioration of time. A large patrimony of knowledge was obtained with the development of new techniques of archeological excavation, which began in these areas in 1700. At the same time, the persistent activity of the volcano stimulated the birth of modern volcanology with the building, in 1841, of the first volcanological observatory in the world. The effects of the different volcanic phenomena during the eruption of 79 AD permitted also to investigate the causes of death during an explosive eruption.
Overall the volcano and its activity have stimulated the advancement of different branches of human knowledge and the preservation of a cultural patrimony unrivaled in the world. These information can be used to develop interdisciplinary project in schools aimed at better understanding the nature of volcanic hazard
Precursors of eruptions at Vesuvius (Italy)
No full textThe historical record of activity of Mount Vesuvius is uncommonly long and may serve as a guide to understand precursors before the outbreak of new activity. Reposes of different lengths have been observed in the past, with long ones preceding violent explosive eruptions.
Eruptions occurring during periods of permanent activity have been preceded by possible deformation of the volcanic edifice and by short duration, earthquake swarms. Otherwise they have occurred without any reported precursors.
The renewal of activity after long periods, like the current one, has been preceded by unrest lasting years to weeks, as a new eruption would require connection to the surface of a reservoir at depth ranging between 6 and 4 km. Since 1944, episodic seismic swarms, have occurred with a frequency similar to that of the violent strombolian eruptions during the last period of permanent activity; they are interpreted as intrusions and arrest of magma batches into a reservoir at the same depth of that feeding past sub-plinian eruptions
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