Frictional and Biomechanical Forces and Biological Effects of a Trapezoidal Versus Rectangular Bracket

This paper presents a study of the frictional and biomechanical forces in a trapezoidal versus rectangular bracket. Moreover, a biological study based on the presence of periostin in the crevicular fluid was carried out. The main aim is to validate the novel and innovative bracket design (utility model U-2013 30 854 applied for on: 8th July 2013. The scope of protection of this utility model covers Spain, France and Portugal). Results demonstrate that trapezoidal brackets transmit the forces to the tooth more uniformly and generate lower frictional forces, in an angle dependent manner until a maximum of 8°, than the rectangular ones.