Introduction: Non-carious lesions are an oral health pro-blem in adults, consequently it is necessary to create mechanisms for their diagnosis and prevention. Objective: To determine the frequency of erosion, abrasion related factors patients treated at a university dental clinic. Material Methods: A cross-sectional study was conducted sample 153 adults clinic Lima, Peru, 2018. Personal aspects...

Probably due to the fluoridation and improved oral hygiene habits, there has been a significant caries decline in children in developed countries. At the same time, epidemiological studies show significant increase of hard dental tissue loss by noncarious processes. Noncarious wear could be the result of three processes: abrasion, attrition and erosion. Nowadays, the most important of them, and...

BACKGROUND This in vitro study analysed the effect of different fluoride concentrations in acidic or neutral liquid dentifrices in protecting enamel and dentine from erosive and abrasive wear. METHODS Bovine enamel and dentine specimens (n = 132) were randomly allocated to 11 groups (each n = 12): experimental liquid dentifrices with 550 ppm F, 1100 ppm F, 5000 ppm F or 0 ppm F/placebo (each ...

INTRODUCTION The aim of this study was to evaluate the condition of the ossicular chain in patients requiring surgery for cholesteatoma. MATERIALS AND METHODS In a retrospective analysis, the destruction of the individual and combined bony structures of the ear was described in 166 patients with cholesteatoma who went through surgery in our Otology Center between 2003 and 2009. RESULTS Tota...

The overall intent of this research is to develop numerical models of erosion of levees, dams and embankments, validated by physical models. The physical model tests were performed at 1-g and at high g’s using a geotechnical centrifuge facility. The erosion was modeled in detail, from beginning to end, that is from the time the levee was overtopped until the levee was breached. Typical quantiti...

Large-scale topographic analyses show that hemisphere-scale climate variations are a first-order control on the morphology of the Andes. Zonal atmospheric circulation in the Southern Hemisphere creates strong latitudinal precipitation gradients that, when incorporated in a generalized index of erosion intensity, predict strong gradients in erosion rates both along and across the Andes. Cross-ra...

This in vitro study evaluated the impact of initial erosion on the susceptibility of enamel to further erosive challenge. Thirty bovine enamel blocks were selected by surface hardness and randomized into two groups (n = 15): GC- group composed by enamel blocks without erosion lesion and GT- group composed by enamel blocks with initial erosion lesion. The baseline profile of each block was deter...

Aim: Tea is a traditional beverage. There are different types of tea, such as black, green, oolong, herbal and fruit teas. In recent years, there has been increased interest in herbal and fruit teas among new generations. The aim of this study was to assess the erosive potential of some herbal and fruit teas on the Turkish market. Methods: The erosive potential of five fruit and six herbal teas...

[1] We present a mesoscale erosion/deposition model, which differs from previous landscape evolution models equations by taking explicitly into account a mass balance equation for the streamflow. The geological and hydrological complexity is lumped into two basic fluxes (erosion and deposition) and two averaged parameters (unit width discharge q and stream slope s). The model couples the dynami...

Low lying coastal areas have always been attractive for people to live, but are also prone to flooding. In The Netherlands, half of the population lives in the coastal area below mean sea level where two-thirds of the economic value is located. Coastal dunes protect the hinterland from flooding as a primary sea defence along the major part of the Dutch coastline. The envisaged protection level ...