Benjamin K. Poon

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OBJECTIVE Single-crown preparations at a dental teaching hospital were compared with guidelines advocated in the dental literature. METHOD AND MATERIALS Sixty-three single complete gold crown and 151 single ceramometal crown preparations were evaluated. Impression silhouettes were measured for occlusal and axial wall tooth reductions, shoulder widths,(More)
A crucial aspect of Peer-to-Peer (P2P) systems is that of providing incentives for users to contribute their resources to the system. Without such incentives, empirical data show that a majority of the participants act as free riders. As a result, a substantial amount of resource goes untapped, and, frequently, P2P systems devolve into client/server systems(More)
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