BACKGROUND The aim of the study was to test the efficacy of a novel low-abrasive air polishing powder in subgingival plaque removal at interdental sites during periodontal maintenance therapy (PMT). METHODS Using a split mouth design, subgingival plaque was removed in 23 PMT patients using a low abrasive powder using a standard air polishing unit (test) or curets (positive control). Before an...

Prevention of intraventricular haemorrhage in preterm infants in Britain and Ireland EDITOR,-Intraventricular or periventricular haemorrhage is a potential cause of morbidity and mortality in preterm infants. Many potential treatments have been studied but three in particular have influenced practice in the British Isles: vitamin El; ethamsylate2; and fresh frozen plasma.3 Meta-analysis has sho...

This paper develops analytically a statistical model for predicting the material removal in mechanical polishing of material surfaces (MS). The model was based on the statistical theory and the abrasive–MS contact mechanisms. The pad-MS and pad-abrasive-MS interactions in polishing were characterised by contact mechanics. Two types of active abrasive particles in the polishing system were consi...

The paper presents the results of experimental work on assessment 3D geometry surface stereometry obtained as a result Water Jet (AWJ) water-abrasive beam cutting using an Eckert Opal WaterJet COMBO hydro-abrasive cutter. Studies geometric structures were conducted Alicona Infinite Focus microscope. article analyses selected spatial roughness parameters multilayer structure surfaces combined vu...

Wombats are unique among marsupials in having one pair of upper incisors, and hypsodont molars for processing tough, abrasive vegetation. Of the three extant species, the most abundant, the common wombat (Vombatus ursinus), has had the least attention in terms of masticatory muscle morphology, and has never been thoroughly described. Using MRI and digital dissection to compliment traditional gr...

In the present work, the optimization of the abrasive water jet machining (AWJM) process parameters with multiple performance characteristics based on the orthogonal array with the grey relational analysis (GRA) has been studied. Optimization of multiple response characteristics is far more complex compared to optimization of single performance characteristic. A grey relational grade (GRG) calc...

Finding a wear law that is valid over a wide range of conditions and materials would have enormous practical value. The authors have previously iscovered a simple relationship describing the evolution of the abrasive wear rate of steel sliding against boron carbide-coated coupons, and have eveloped a model accounting for its kinetics. The authors show here that this wear equation accurately des...

Current commercial polymer membranes have shown high performance and durability in water treatment, converting poor quality waters to higher quality suitable for drinking, agriculture and recycling. However, to extend the treatment into more challenging water sources containing abrasive particles, micro and ultrafiltration membranes with enhanced physical durability are highly desirable. This r...