COMPARISON OF FRACTURE TORQUE AND LEVEL OF FRACTURE OF TWO ORTHODONTIC MINI-SCREWS
BY
Shkar Fatih Mohammed (110117022)
Kurdistan Ismail Ameen (110116053)
Rayan Zrar Abdulqadir (110116069)
Supervisor: Dr. Omar Sabah
Abstract
Objective: To measure the maximum fracture torque and level of fracture of two commercially available orthodontic mini screw.
Materials and methods: Twenty orthodontic mini-implants of {(Tomas. Dentaurm. Germany; GNI, Korean)] were inspected in an in-vitro study. An intraoral digital torque gauge was positioned perpendicular to the bone surface and placed into the 10 mm thick bovine femoral cortical bone in the same manner as mini-implants. There were several methods used to assess the experiment’s data, including one-way ANOVA and Duncan test and analysis of variance.
Results: The Tomas gave a high fracture torque value compared with GNI. GNI gave a high percentage of fracture at an apical level while Tomas gave at the middle of it.
Conclusions: According to the fracture torque, the two mini-screws are accepted clinically. The design and core thickness play a major role in fracture resistance and the level of the fracture.
The mini-implant format, which helps distribute force between the head and the active section
of the mini-implant, is directly related to fracture resistance.
Key words: Mini-screws, Fracture Torque, Anchorage, GNI Mini-Screws, Tomas Mini-Screws,
Cortical bone