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

Abstract EN

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.