◆Adjustment is possible both before and during surgery so the most appropriate height can be achieved through adjustment during surgery to realize the optimal expansion result
◆hicker lateral wall of contact end surface of end plate above and under type-II titanium mash makes it possible to adjust height both before and during surgery
◆ Local infection at implant site
◆ Abnormal hypertrophy◆ Allergy to metals
◆ Patients are unwilling to restrict activity or disobey medical advice