Pearls of the Pacific Special Section: Class II Correction Tips for Using Forsus in Class II Correction Dr. James Chen PCSO Bulletin Contributor Class II correctors such as ForsusTM springs (Figure 1) have been used in our practice for a little more than a decade now. The primary purpose of a Forsus spring is to apply the correct biomechanical forces toward correction of Class II malocclusions. The final outcome is the same with Forsus springs and elastics, but the way they go about the correction is vastly different. Forsus springs deliver pressure to the lower arch by pushing it forward, unlike elastics, which pull the lower arch forward. Figure 1. Forsus springs device Usually, the pushing force of the Forsus spring can cause the appliance to spin in the patient's mouth and cause painful sores at the corners of their mouth, but some minor adjustments to the push rod can greatly improve the patient's comfort, limit emergencies, and can even produce slightly more activation. The key is in the push rod component. I routinely bend the loop portion of the push rod from the out-of-the-box acute angle to a 90° angle (Figure 2). This little difference provides more surface area for the loop to contact the lower brackets and reduces the rotation issues. In addition, the 90° bend allows for slightly more activation to the push rod without the addition of shims. The bend is placed right after the stopper on the push rod. The second adjustment I make is to bend the loop portion slightly toward the dentition, almost like a toe-in bend at the loop (Figure 3). I find this slight toe-in bend useful for stabilizing the Forsus from rotating in the mouth as well. Figure 2. Bending the loop portion of the push rod to 90° I want to thank Dr. Marc Deberardinis for teaching me this very useful pearl in residency! Figure 3. Slight toe-in bend in the loop portion Summer 2020 PCSO Bulletin 57