IADR Abstract Archives
Varied Orthodontic Tipping and Torque Expressions at Different Interbracket Distances
Objectives: The tipping and torque bends are essential factors in finishing orthodontic cases. Tooth morphology and interbracket distance may influence the tipping and torque expressions but studies pertaining to this subject are limited. The purpose of this study was to investigate the effect of interbracket distance on tipping and torque expression in preadjusted orthodontic brackets
Methods: One hundred thirty-five (135) pre-adjusted orthodontic brackets of McLaughlin, Bennett, and Trevisi (MBT) prescription with a slot of 0.022- inches for central incisor, lateral incisor and cuspid were used. The brackets were mounted on acrylic plexiglass sheet with different interbracket distances of eight (8), four (4), and six (6) mm per group. A 0.021x0.025-inches stainless steel arch wire was engaged to the brackets and uniformly tied with a of 0.009-inches stainless steel ligature wire. A Universal Testing Machine (INSTRON 3360, USA) was utilized to evaluate the resistance force to sliding (frictional force) of each group to produce friction values. Those values were computed and analyzed using the mathematical rule of proportions
Results: Interbracket distance affects the tipping and torque values of MBT prescription, such that, the tipping and the torque bends have a direct proportional relationship with frictional force (resistance to sliding) with α value = 0.05
Conclusions: Conclusively, it may be said that interbracket distance affects the tipping and torque values of MBT prescription, such that, the tipping and the torque bends have a directly proportional relationship with frictional force (resistance to sliding), such that when IBD is increased/decreased by two (2) mm, the tipping values may increase/decrease by two (2) degrees and torque values may increase/decrease by three (3) degrees
Methods: One hundred thirty-five (135) pre-adjusted orthodontic brackets of McLaughlin, Bennett, and Trevisi (MBT) prescription with a slot of 0.022- inches for central incisor, lateral incisor and cuspid were used. The brackets were mounted on acrylic plexiglass sheet with different interbracket distances of eight (8), four (4), and six (6) mm per group. A 0.021x0.025-inches stainless steel arch wire was engaged to the brackets and uniformly tied with a of 0.009-inches stainless steel ligature wire. A Universal Testing Machine (INSTRON 3360, USA) was utilized to evaluate the resistance force to sliding (frictional force) of each group to produce friction values. Those values were computed and analyzed using the mathematical rule of proportions
Results: Interbracket distance affects the tipping and torque values of MBT prescription, such that, the tipping and the torque bends have a direct proportional relationship with frictional force (resistance to sliding) with α value = 0.05
Conclusions: Conclusively, it may be said that interbracket distance affects the tipping and torque values of MBT prescription, such that, the tipping and the torque bends have a directly proportional relationship with frictional force (resistance to sliding), such that when IBD is increased/decreased by two (2) mm, the tipping values may increase/decrease by two (2) degrees and torque values may increase/decrease by three (3) degrees