iM3 Wedge Dental Sharpening Stone. The wedge sharpening stone has a flat surface with a radius on either side. Most dental hand instruments including elevators, curettes and scalers can be sharpened. Dental hand instruments should be kept sharp and true to their original design. For best results, instruments should be sharpened after use. The stone can be used with water, oil or dry. Sharpening instructions included. A3110.