introduction: the aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. methods: 40 human extracted molars divided into 4 groups (n=10) received the following treatments. group 1: carbide bur, group 2: air abrasion with aluminum oxide 50 μm, group 3: irradiated with erbium-doped yttrium aluminum garnet (er: yag) laser (150 mj/20hz), g...

statement of problem: in some clinical situations, repair of composite restorations is treatment of choice. improving the bond strength between one new and old composite usually requires increased surface roughness to promote mechanical interlocking since chemical bonding might not be adequate. similarly, the treatment of a laboratory fabricated resin composite restoration involves the same pro...

Abstract A transition to a mechanical source for x-ray reference field is desired replace high-activity Co-60 and Cs-137 gamma-ray sources enhancing nuclear security safety management. The National Metrology Institute of Japan (NMIJ) developed new photon using an electron beam from linac with energy less than 1 MeV. effective the comparable gamma-ray. air kerma rate in was validated by comparin...

Th is study uses a bioarchaeological approach to examine the cultural and biological relationships between two groups who lived in ancient Nubia during the Bronze Age, C-Group and Kerma. While archaeological evidence indicates that these groups show many cultural similarities, refl ections of behaviors such as pottery use and mortuary practices suggest that C-Group and Kerma displayed their eth...

The American Association of Physicists in Medicine (AAPM) presents a new protocol, developed by the Radiation Therapy Committee Task Group 61, for reference dosimetry of low- and medium-energy x rays for radiotherapy and radiobiology (40 kV < or = tube potential < or = 300 kV). It is based on ionization chambers calibrated in air in terms of air kerma. If the point of interest is at or close to...