An instrument for debonding an orthodontic bracket from a tooth surface includes first and second plier portions coupled for relative pivotal movement. When the inner-swing arm and the outer-swing arm are expanded, the assistant rods are fixed on two sides of the main rod; when the inner-swing arm and the outer-swing arm are folded, the assistant rods are positioned in parallel with the main rod. In a typical embodiment, a radiation measurement collection system is provided which has a first program logic element for collecting the radiation measurements as collected radiation measurements when the presence of the entity is detected and the motion of the entity is detected. The hinge assembly may be attached to the body and the closure member and may include first and second torsion rods extending between first and second sides of the opening of the cavity.