Primary Stability of Self-Drilling and Self-Tapping Mini-Implant in Tibia of Diabetes-Induced Rabbits

Abstract

Objective. This study aimed to evaluate effects of type 1 diabetes mellitus and mini-implant placement method on the primary stability of mini-implants by comparing mechanical stability and microstructural/histological differences. Methods. After 4 weeks of diabetic induction, 48 mini-implants (24 self-tapping and 24 self-drilling implants) were placed on the tibia of 6 diabetic and 6 normal rabbits. After 4 weeks, the rabbits were sacrificed. Insertion torque, removal torque, insertion energy, and removal energy were measured with a surgical engine on 8 rabbits. Remaining 4 rabbits were analyzed by microcomputed tomography (micro-CT) and bone histomorphometry. Results. Total insertion energy was higher in self-drilling groups than self-tapping groups in both control and diabetic groups. Diabetic groups had more trabecular separation in bone marrow than the control groups in both SD and ST groups. Micro-CT analysis showed deterioration of bone quality in tibia especially in bone marrow of diabetic rabbits. However, there was no statistically significant correlation between self-drilling and self-tapping group for the remaining measurements in both control and diabetic groups. Conclusions. Type 1 diabetes mellitus and placement method of mini-implant did not affect primary stability of mini-implants.

Er:YAG laser, piezosurgery, and surgical drill for bone decortication during orthodontic mini-implant insertion: primary stability analysis—an animal study

“…In specific cases (low bone density), the orthodontic implant is driven without decortication by a self-drilling method. An appropriate method of implant insertion is a key factor to achieve good primary stability, sufficient to the immediate loading of the orthodontic mini-implants [ 5 ].…”

Miniscrew Applications in Orthodontics

“…It may be better not to use miniscrews for patients with adverse risk factors; however, if miniscrews have to be used, longer healing periods should be allowed and specific loading protocols should be applied [81,82]. It is notable that in their animal study, Park et al [83], found that the presence of diabetes and variation in the placement system (self-drilling or self-tapping) did not affect the initial stability of orthodontic mini-implants. Generally, patients do not experience pain and discomfort following miniscrew placement [6,16,58,35].…”