Growth and spectroscopic characterization of monolayer and few-layer hexagonal boron nitride on metal substrates.

Atomically thin two dimensional hexagonal boron nitride (2D h-BN) is one of the key materials in the development of new van der Waals heterostructures due to its outstanding properties including an atomically smooth surface, high thermal conductivity, high mechanical strength, chemical inertness and high electrical resistance. The development of 2D h-BN growth is still in the early stages and largely depends on rapid and accurate characterization of the grown monolayer or few layers h-BN films. This paper demonstrates a new approach to characterizing monolayer h-BN films directly on metal substrates by grazing-incidence infrared reflection absorption spectroscopy (IRRAS).

Scanning electron microscopic study of teeth restored with fiber posts and composite resin: An in vitro study.

Aims And Objectives: The aim of this study is to compare and evaluate the thickness of resin dentin interface zones (RDIZ) obtained by luting carbon fiber post to intra-radicular dentin, either with All-Bond 2 bonding agent and C and B composite cement or Panavia F dentin-bonding system and Panavia F resin cement.

Materials And Methods: Twenty single rooted mandibular premolars of similar sizes were prepared for the carbon fiber post after biomechanical preparation and obturation. They were divided into two groups, Group 1 and 2 of 10 samples each.

Taurodontism: A dental rarity.

Taurodontism is a developmental disturbance of a tooth in which body is enlarged at the expense of the roots. An enlarged pulp chamber, apical displacement of the pulpal floor and lack of constriction at the cementoenamel junction are the characteristic features. It appears most frequently as an isolated anomaly.

Chemical analysis of dentin surfaces after Carisolv treatment.

Aims And Objectives: This study was done to characterize the surface chemistry after caries excavation with burs and Carisolv 2, by analyzing the relative amounts of organic and inorganic content, and also to analyze the penetration of the adhesive after etching and bonding using Micro Raman spectroscopy.

Materials And Methods: Twenty extracted molars with caries were distributed into the following groups and treated accordingly. Group 1-excavation with bur (10 teeth), and Group 2-excavation using Carisolv 2 (10 teeth).

Intraventricular repair of double-outlet left ventricle.

A 3 1/2-year-old child with double-outlet left ventricle and subaortic ventricular septal defect underwent successful surgical intervention with an intraventricular repair and a boomerang-shaped piece of Dacron patch. While an intraventricular repair for double-outlet left ventricle has been reported, we discuss here its application to this particular type of double-outlet left ventricle.