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PURPOSE This study was performed to evaluate the value of dental operating microscope(DOM) in treating blocked canals. METHODS 161 blocked canals in 113 teeth were treated with ultrasonic instruments under DOM. The etiology of canal blockage included calcification, resinifying therapy and broken instruments. All canals were grouped based on the cause of(More)
PURPOSE To evaluate the clinical effect of the teeth with subgingivally involved defect which were conserved by crown lengthening surgery. METHODS 62 teeth, with defect subgingivally from 1.5 mm to 4 mm, mobility degree(MD)</= I degree, appropriate proportion between crown and root, underwent crown lengthening surgery by combining flap surgery and(More)
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