Do Dual-Thread Orthodontic Mini-Implants Improve Bone/Tissue Mechanical Retention?

作者：Lin Yang Sung; Chang Yau Zen; Yu Jian Hong; Lin Chun Li^*

来源：Implant Dentistry, 2014, 23(6): 653-658.

DOI：10.1097/ID.0000000000000144

• mini-implant
• orthodontic
• dual-thread
• insertion
• pull-out
• mechanical retention

Purpose: The aim of this study was to understand whether the pitch relationship between micro and macro thread designs with a parametrical relationship in a dual-thread mini-implant can improve primary stability. %26lt;br%26gt;Materials and Methods: Three types of mini-implants consisting of single-thread (ST) (0.75 mm pitch in whole length), dual-thread A (DTA) with double-start 0.375 mm pitch, and dual-thread B (DTB) with single-start 0.2 mm pitch in upper 2-mm micro thread region for performing insertion and pull-out testing. Histomorphometric analysis was performed in these specimens in evaluating peri-implant bone defects using a non-contact vision measuring system. %26lt;br%26gt;Results: The maximum inserted torque (T-max) in type DTA was found to be the smallest significantly, but corresponding values found no significant difference between ST and DTB. The largest pull-out strength (F-max) in the DTA mini-implant was found significantly greater than that for the ST mini-implant regardless of implant insertion orientation. Mini-implant engaged the cortical bone well as observed in ST and DTA types. %26lt;br%26gt;Conclusion: Dual-thread mini-implant with correct micro thread pitch (parametrical relationship with macro thread pitch) in the cortical bone region can improve primary stability and enhanced mechanical retention.

• 出版日期2014-12
• 单位长春大学; 中国医科大学