background and aims. the aim of this study was to compare shear bond strength (sbs) of metal and ceramic brackets bonded to enamel using acid versus er:yag laser etching. materials and methods. eighty premolars were divided into 4 groups: am (acid etching/ metal brackets), ac (acid etching/ ceramic brackets), lm (laser etching/ metal brackets) and lc (laser etching/ ceramic brackets). enamel co...

This paper presents a single wafer, all-silicon, high aspect-ratio multi-layer polysilicon micromachining technology that combines deep dry etching of silicon with conventional surface micromachining to realize tens to hundreds of microns thick, high aspect-ratio, electrically isolated polysilicon structures with sub-micron air-gaps. Vertical polysilicon sense electrodes as tall as the main bod...

Introduction: Dental ceramics are considered as materials that can restore the appearance of natural teeth. Etching the inner surface of a ceramic restoration with hydrofluoric acid (HF) followed by using a silane coupling agent is a well-known and recommended method to increase the bond strength. The aim of etching on ceramic structure is to enhance the surface roughness (Ra) and energy and to...

background: based on contradictory findings concerning the use of lasers for enamel etching, the purpose of this study was to investigate the shear bond strength of teeth prepared for bonding with er-yag laser etching and compare them with phosphoric acid etching. materials and methods: in this in vitro study forty – eight premolars, extracted for orthodontic purposes were randomly divided in t...

Deep etching of glass and ceramics is far more challenging than silicon etching. For thermally insensitive microelectromechanical microoptical systems, zero-expansion materials such as Zerodur or ultralow expansion (ULE) are intriguing. In contrast to that exhibits a complex network composition, ULE consists only two components, namely, TiO2 SiO2. This fact highly beneficial for plasma Herein, ...

The anisotropic nature of plasma etching is usually exploited to realize vertical nano-/micro- silicon structures by deep reactive ion etching. However, some applications require tilted instead perpendicular profiles with respect the substrate. Here, a controlled realized introducing set metal electric field modulator(s), which modify near sample surface potential. ions from body are accelerate...

Self-etching dentin bonding systems are attractive in that removal of the smear layer and smear plug is not required. It was suggested that less aggressive versions of self-etching primers failed to etch through clinically relevant thick smear layers, resulting in decrease in tensile bond strength. On the other hand, self-etching dentin bonding systems are claimed to be able to etch and prime s...