Bizopen Diamond Bur Pear Shape 330-012 Standard Grit

The Bizopen Diamond Bur Pear Shape 330-012 Standard Grit is the standard instrument for Class I and Class II composite and amalgam cavity preparation where the pear-shaped cavity geometry provides the widest occlusal access for direct restoration placement. The pear shape geometry — a round head transitioning to a narrower neck before the shank — creates cavity preparations with divergent walls toward the occlusal opening while establishing the rounded internal geometry that modern direct composite techniques favor over the sharp internal line angles of older GV Black preparation designs. Bizopen’s 180 grit standard diamond coating covers the full pear-shaped working head, producing the preparation surface quality and cavity geometry appropriate for adhesive composite bonding without requiring subsequent surface conditioning instruments. The 1.2 mm head at its widest point provides adequate occlusal access for Class I preparations on premolars and molars while remaining narrow enough for conservative cavity design that preserves maximum cuspal tooth structure. The rounded base of the pear produces a rounded pulpal floor that reduces stress concentration at the floor-wall junction under occlusal loading — a significant advantage over flat-floored preparations that concentrate stress at the sharp right-angle junction. The pear geometry is equally suited to initial cavity entry and definitive cavity preparation in a single instrument. FG shank, 19 mm. ISO 806 314 245 524 012. Maximum head diameter: 1.2 mm. Total working length: 3.5 mm.