The effects of different pilot-drilling methods on the mechanical stability of a mini-implant system at placement and removal: a preliminary study.
10.4041/kjod.2011.41.5.354
- Author:
Il Sik CHO
1
;
HyeRan CHOO
;
Seong Kyun KIM
;
Yun Seob SHIN
;
Duck Su KIM
;
Seong Hun KIM
;
Kyu Rhim CHUNG
;
John C HUANG
Author Information
1. Department of Orthodontics, School of Dentistry, Seoul National University, Korea.
- Publication Type:Original Article
- Keywords:
Anchorage;
Implant design;
Surface treatment;
Orthodontic mini-implant
- MeSH:
Foot;
Linear Models;
Polyurethanes;
Torque
- From:Korean Journal of Orthodontics
2011;41(5):354-360
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: To investigate the effects of different pilot-drilling methods on the biomechanical stability of self-tapping mini-implant systems at the time of placement in and removal from artificial bone blocks. METHODS: Two types of artificial bone blocks (2-mm and 4-mm, 102-pounds per cubic foot [102-PCF] polyurethane foam layered over 100-mm, 40-PCF polyurethane foam) were custom-fabricated. Eight mini-implants were placed using the conventional motor-driven pilot-drilling method and another 8 mini-implants were placed using a novel manual pilot-drilling method (using a manual drill) within each of the 2-mm and 4-mm layered blocks. The maximum torque values at insertion and removal of the mini-implants were measured, and the total energy was calculated. The data were statistically analyzed using linear regression analysis. RESULTS: The maximum insertion torque was similar regardless of block thickness or pilot-drilling method. Regardless of the pilot-drilling method, the maximum removal torque for the 4-mm block was statistically higher than that for the 2-mm block. For a given block, the total energy at both insertion and removal of the mini-implant for the manual pilot-drilling method were statistically higher than those for the motor-driven pilot-drilling method. Further, the total energies at removal for the 2-mm block was higher than that for the 4-mm block, but the energies at insertion were not influenced by the type of bone blocks. CONCLUSIONS: During the insertion and removal of mini-implants in artificial bone blocks, the effect of the manual pilot-drilling method on energy usage was similar to that of the conventional, motor-driven pilot-drilling method.
