FIG. 4 FIG. 5A FIG. 5B FIG. 6 FIG. 7 FIG. 8 FIG. 9 FIG. 10 FIG. 11 arch and dry everything together. If placement jigs will be " tried in " before the final placement, this should be done before etching to preserve the exposed enamel rods. Primer/adhesive interface: From a high-level perspective, outside of proper etching technique, one of the most neglected, misunderstood and vital aspects of bonding is the preservation of the chemically clean interface at the primer/adhesive contact. Specific to digitally guided systems, the teeth should be exposed to the oral environment as an etched surface, not a primed one. Tray delivery: Many leading digitally guided systems feature a " clean base " IDB method. The primary drawback to any clean base indirect bonding is having to ensure the paste has been properly buttered into the mesh of the clean bases. With direct bonding, clinicians have unlimited access to the bracket mesh and a spatula can be used to properly smear the adhesive into the undercuts. IDB's placement jigs and delivery trays complicate this process by blocking the access of an applicator. Modifying a nylon spatula by cutting the blade along the long access to reduce the width is one option. A composite filling instrument can be used as well to " pad " the composite into the bracket bases. Both techniques should involve a coat of primer on the instrument to reduce stringing of the paste. Once the trays or jigs are loaded and ready for delivery (be sure to read the " Preloading " section at the end of this article), the etched surfaces should be desiccated and primer placed immediately to preserve the primer/adhesive interface. Considering the inherent contamination complications of bonding in the oral cavity, the discussion becomes a worse of two evils: bonding MARCH 2023 | 61 | ORTHOTOWN.COMhttp://www.ORTHOTOWN.COM