INBDE (Integrated National Board Dental Examination) Practice Exam

Instrumentation for an Endodontic treatment involves removing infected or inflamed pulp within the canal space of a tooth. This process begins at the coronal (or crown) aspect of the tooth, and progresses toward the root apex, ultimately cleaning the entire canal space. Option A, "CDJ" stands for cementoenamel junction, which is the anatomical landmark that denotes the border between the crown and root of a tooth. This is the starting point for instrumentation. Option B, "Crown" refers to the top portion of a tooth, and although it is involved in the overall treatment process, it is not the specific level of instrumentation. Option C, "Apex" refers to the tip of the root of the tooth and is the ultimate goal for instrumentation, but it is not the starting point. Option D, "Root canal" also refers to the space within the tooth that the treatment focuses on, but it is not the specific level of instrumentation.