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STATEMENT OF PROBLEM Posts and cores are often required with pulpless teeth to provide retention and resistance form for complete crowns. Nevertheless, conventional posts may increase the potential for root fracture. PURPOSE This study compared the resistance to vertical root fracture of extracted teeth treated with post-core systems that were modified(More)
Ceramics are currently the most widely used material for veneering crowns and bridges. Newer applications, such as bonded inlays, onlays, and veneers, are steadily gaining in popularity. A new generation of metal-free, all-ceramic systems for crowns became available during the 1980s. More recently, other all-ceramic systems with improved mechanical(More)
This investigation was designed to determine the differences in tissue alteration produced by electrosurgical machines with different carrier frequencies and waveforms. Histologic analysis showed that: 1. The machine with full-wave rectification and the lowest frequency of operation (machine I, 1.7 MHz) produced significantly greater tissue alteration in(More)
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