The present invention relates to systems and methods for detecting deviations from an orthodontic treatment plan. Once the stainless steel band is disposed around the inner mold, pad material is injected into the gap defined between the outer mold and the stainless steel band. The opening portion 17 is provided on a connecting face 3a with respect to the apparatus main body 2. A reticle can be used to form additional test structures that are separated from the primary die. The multiplexing signal is either the upper threshold voltage or the lower threshold voltage.