Method for treating a screw-cement retained prosthesis, abutment and implant for a screw-cement retained prosthesis

A method for treating a screw-cement retained prosthesis, comprising the steps of:

• providing an implant wherein an abutment, which comprises a joining projection formed in the lower portion of an abutment body and a first screw hole formed upward and downward through the body, is engaged to a fixture with a screw, and a prosthetic appliance is bonded to the abutment;
• forming a second screw hole in the prosthetic appliance correspondingly to the first screw hole;
• and
• separating the prosthetic appliance and abutment from the fixture by loosening the screw through the first and the second screw holes.

An abutment for a screw-cement retained prosthesis, comprising:

• a body, which includes a bonding portion bonded to a prosthetic appliance and is formed with a screw hole upward and downward through the body;
• and
• a joining projection, the joining projection formed in the lower portion of the body, and the joining projection comprising a sticking portion, which is entirely or partially stuck to a joining groove formed in the upper portion of a fixture to support the body, an anti-rotating portion, which is formed adjacently to the sticking portion to limit a relative rotation of the body with respect to the fixture, and a leading inclined surface, which is formed with the sticking portion or the anti-rotating portion partially removed,
• wherein due to the leading inclined surface, an allowance space is formed between the joining projection and the joining groove, and due to the allowance space, the prosthetic appliance and body are easily separated from the fixture.

An implant for a screw-cement retained prosthesis, comprising:

• a fixture wherein a joining groove is formed in the upper portion of the fixture;
• and
• an abutment comprising:
• a body, which includes a bonding portion bonded to a prosthetic appliance and is formed with a screw hole upward and downward through the body;
• and
• a joining projection, the joining projection formed in the lower portion of the body, and the joining projection comprising a sticking portion, which is entirely or partially stuck to the joining groove to support the body, an anti-rotating portion, which is formed adjacently to the sticking portion to limit a relative rotation of the body with respect to the fixture, and a leading inclined surface, which is formed with the sticking portion or the anti-rotating portion partially removed,
• wherein due to the leading inclined surface, an allowance space is formed between the joining projection and the joining groove, and due to the allowance space, the prosthetic appliance and body are easily separated from the fixture.