Abstract: A drill and drill cover and autogenous bone collector using the same are provided. The autogenous bone collector comprises a shaft unit connected to a driving device and a cutting unit which revolves and collects bone particles of a patient. The cross-sectional area of the cutting unit is from 10% to 40% of an area of a circle having a radius corresponding to a distance from the center of the cutting unit to the outermost end portion of the cutting unit.

Abstract: A drill for an implant surgery is provided which allows a mucous membrane in the maxillary sinus to be quickly and safely lifted without being damaged during a surgery for the maxillary sinus. The drill for use in an implant surgery includes a connection portion formed at an upper end of a body of the drill to be connected with a driving device; and a cutting portion formed at a lower end of the body and having a cutting blade for drilling, wherein an outer circumferential edge of a distal end of the cutting portion protrudes rather than a center of the distal end of the cutting portion.

Abstract: A drill and drill cover and autogenous bone collector using the same are provided. The autogenous bone collector comprises s shaft unit connected to a driving device and a cutting unit which revolves and collects bone paticles of a patient. The cross-sectional area of the cutting unit is from 10% to 40% of an area of an imaginary circle having a radius corresponding to a distance from the center of the cutting unit to the outermost end portion of the cutting unit.

Abstract: A drill for an implant surgery is provided which allows a mucous membrane in the maxillary sinus to be quickly and safely lifted without being damaged during a surgery for the maxillary sinus. The drill for use in an implant surgery includes a connection portion formed at an upper end of a body of the drill to be connected with a driving device; and a cutting portion formed at a lower end of the body and having a cutting blade for drilling, wherein an outer circumferential edge of a distal end of the cutting portion protrudes rather than a center of the distal end of the cutting portion.

Abstract: A cooking apparatus which prevents a top casing thereof from being heated by heat transmitted from an electric heater. The cooking apparatus having a grill part to cook food thereon, and a electric heater to cook the food, includes a grill housing having a main casing including an opening part coupled with the grill part, providing the electric heater thereon, and a top casing coupled with an upper side circumferential area of the main casing with the center to the opening part, and the top casing including a plurality of top casing units separately provided.

Abstract: A cooking apparatus which prevents a top casing thereof from being heated by heat transmitted from an electric heater. The cooking apparatus having a grill part to cook food thereon, and a electric heater to cook the food, includes a grill housing having a main casing including an opening part coupled with the grill part, providing the electric heater thereon, and a top casing coupled with an upper side circumferential area of the main casing with the center to the opening part, and the top casing including a plurality of top casing units separately provided.