Parallel implant placement

Primary stability

Emerging techniques in dental implant surgery are trending towards one-stage procedures and immediate function and therefore require a high level of primary stability of the implant.

In order to implement the most appropriate drilling protocol based on bone quality, it is important to understand the anatomy of an implant from the head to the apex. Parallel implants with a narrow tip at the apex (for example NobelSpeedy), have the capacity of compressing and expanding the bone when inserted, working as an osteotome.

Drill procedure considerations

In order to achieve a good primary stability in poorly mineralized bone, an underpreparation drilling protocol together with bicortical anchorage is recommended, whenever possible aiming at primary stability. The insertion of the implants follows standard procedures, except that with underpreparation an insertion torque of at least 30 Ncm should be reached before the final seating of the implant.

• For 4.0 mm implants, the sites are prepared starting with a precision drill or round drill to mark the final positioning of the implant. The preparation is typically done by full drill depth with a 2 mm twist drill followed by 2.4/2.8 mm step drill and 3.2/3.6 mm (depending on bone density)
• In cases of very dense bone, the 3.8 mm step drill may be used in the cortical bone. Maintaining contact between the implant neck and the cortical bone is important for the primary stability. The implant neck is therefore aimed to be positioned at bone level and bicortical anchorage is established whenever possible
• For immediate function at least 35 Ncm torque force is needed

Detailed drilling protocols

For detailled information on osteotomy of the site and the drill protocol refer to the instructions and handbooks of the respective manufacturers and implants.