Two Improvements M

In contrast to #2 implant, the insertion torque of a 5x9 mm implant at #18 (Fig.1) is less than 10 Ncm because of depth difference between 2 implant systems.  The design is for 5x10 mm.  In fact each drill has its inherent 1.2 mm long tip.  The 8.5 mm drilling depth is enough for 9 mm implant.  The 2nd potential problem is that the implant may truncate a branch from the Inferior Alveolar Canal to the distal root of the 1st molar (Fig.2 (original design)).  Ideally the implant should be placed distal and tilted mesial and short in length (Fig.3 (design to be improved)).  A smaller implant may also help.  A layer of new bone forms on the top of the implant 3 months postop (Fig.4 *).  It is removed with surgical handpiece.  After use of 5.6 mm profile drill, a 6x4 mm healing abutment is placed with minimal clearance from the mesial crest (Fig.5 *).  A month later, a 5x4(3) mm pair abutment is seated apparently completely (Fig.6).  A crown is delivered nearly 6.5 months postop (Fig.7 (mesial contact light)).  The implant is subcrestal (*).

Return to Lower Molar Immediate Implant Trajectory II Prevent Screw Loosening  Screw Xin Wei, DDS, PhD, MS 1st edition 10/29/2019, last revision 02/23/2021