Effect of cutting flute length and shape on insertion and removal torque of orthodontic mini-implants / 대한치과교정학회지
Korean Journal of Orthodontics
;
: 95-104, 2009.
Article
in Korean
| WPRIM
| ID: wpr-657018
ABSTRACT
OBJECTIVE:
The purpose of this study was to evaluate the effect of length and shape of cutting flute on mechanical properties of orthodontic mini-implants.METHODS:
Three types of mini-implants with different flute patterns (Type A with 2.6 mm long flute, Type B with 3.9 mm long and straight flute, Type C with 3.9 mm long and helical flute) were inserted into the biomechanical test blocks (Sawbones Inc., USA) with 2 mm and 4 mm cortical bone thicknesses to test insertion and removal torque.RESULTS:
In 4 mm cortical bone thickness, Type C mini-implants showed highest maximum insertion torque, then Type A and Type B in order. Type C also showed shortest total insertion time and highest maximum removal torque, but Type A and B didn't showed statistically significant difference in insertion time and removal torque. In 2 mm cortical bone thickness, there were no significant difference in total insertion time and maximum removal torque in three types of mini-implants, but maximum insertion torque of Type A was higher than two other Types of mini-implants.CONCLUSIONS:
Consideration about length and shape of cutting flute of mini-implant is also required when the placement site has thick cortical bone.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Torque
Language:
Korean
Journal:
Korean Journal of Orthodontics
Year:
2009
Type:
Article
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