Torque expression of 0.018 and 0.022 inch conventional brackets

Area of Science:

• Orthodontics
• Biomaterials Science
• Dental Mechanics

Background:

• Understanding bracket-یز and archwire interactions is crucial for effective orthodontic treatment.
• Bracket torque significantly influences the moments generated during tooth movement.
• Previous research has explored various bracket-wire combinations, but direct comparisons of torque effects are essential.

Purpose of the Study:

• To compare the moments generated by low- and high-torque orthodontic brackets.
• To evaluate the influence of different bracket slot sizes and archwire dimensions on generated moments.
• To determine the statistical significance of differences in moments between various bracket-یز configurations.

Main Methods:

• Four bracket prescription-slot combinations (0.018 and 0.022 inch, low- and high-torque) of Mini Diamond® Twin brackets were tested.
• Identical maxillary acrylic resin models with leveled and aligned teeth were used.
• Stainless steel archwires (0.017 × 0.025 inch and 0.019 × 0.025 inch) were evaluated in conjunction with the brackets on an orthodontic measurement and simulation system (OMSS).

Main Results:

• High-torque brackets consistently produced significantly higher moments compared to low-torque brackets.
• The maximum moment generated by a 0.017 × 0.025 inch archwire in 0.018 inch brackets was higher in high-torque (14.33 Nmm) than low-torque (12.95 Nmm) configurations.
• In 0.022 inch brackets, the 0.019 × 0.025 inch archwire generated lower moments (9.32 Nmm for high-torque, 6.48 Nmm for low-torque) compared to the 0.018 inch system.

Conclusions:

• High-torque brackets are more effective in generating higher moments than low-torque brackets.
• Archwire dimensions and bracket slot size interact to influence moment generation.
• These findings have implications for selecting appropriate bracket-یز and archwire combinations to achieve desired orthodontic outcomes.