In vitro evaluation of force-expansion characteristics in a newly designed orthodontic expansion screw compared to conventional screws
Objective : Expansion screws like Hyrax, Haas and other types, produce heavy interrupted forces which are unfavorable for dental movement and could be harmful to the tooth DEODORANT SPORT and periodontium.The other disadvantage of these screws is the need for patient cooperation for their regular activation.The purpose of this study was to design a