抄録
For the primary stabilities of implants, we examined the insertion torque of a straight implant (Straumann®SP Implant) and a tapered implant (Straumann®TE Implant) using the implant training cortical-cancellous bone model (Model-1) and cancellous bone model (Model-2), and obtained the following results:
1. The insertion torque of the straight implant significantly increased with implant body length and with total number of screw lines counted on the axial length of the implant in Model-1 and -2.
2. The insertion torque of the tapered implant was higher than that of the straight implant. The implant body length and total number of screw lines hardly affected the insertion torque of the tapered implant of Model-1. The insertion torque of the tapered implant of Model-2 increased significantly both with implant body length and with number of screw lines.
3. The insertion torque showed larger values in order of tapered implant (Model-1) ＞tapered implant (Model-2)＞straight implant (Model-1)＞straight implant (Model-2), but the insertion torque of the straight implant (Model-2) showed abnormally low values at 2 and 3 screw lines.
4. From the results, it can be summarized that the primary stability of the tapered implant is better than that of the straight implant and the insertion torque is influenced by quality of bone, implant body length, implant body form (straight or tapered type) and number of screw lines.
