The working tip of the drill is designed to match the implants. The microextension of the implant neck is also taken into account. The extension is transferred to the implant site when the insertion depth is extended as far as possible. The variable preparation depth of the crestal region of the cavity controls the degree of internal condensation that is achieved with the special Xive implant and thread design during the final placement.
Additional properties of the Xive twist drills crestal:
- Manufactured from surgical stainless steel
- Cutting edge length maximum 6 mm
- Non-cutting apical step 2 mm long to guide the drill in previously prepared bone
- Expansion of diameter in the crestal section of the cavity by approx. 0.2 mm
If there is no resistance or only minimum resistance during standard preparation a low bone density can be assumed. This is taken into account subsequently when using the Xive crestal twist drill: the preparation depth in this case is 2 mm to reduce the preparation solely to the crestal section of the bone.
High resistance of the bone during preparation indicates bone class D I. In this case the bone is prepared to the maximum depth of 6 mm.
The maximum depth for crestal preparation of implants 8 mm in lenghts has to be 4 mm.
All Dentsply Sirona Implants Instructions for Use are available on ifu.dentsplysirona.com