Dental Assisting Professional Knowledge
The Professional Knowledge domain tests the legal, ethical, administrative, and anatomical background that supports chairside work. Expect questions on scope of practice, informed consent, confidentiality, record keeping, communication, dental terminology, and the roles of the dental team.
Legal and ethical rules
The state dental practice act defines scope of practice and which expanded functions an assistant may perform; delegation requires training and, where required, certification. Informed consent requires disclosure of diagnosis, proposed treatment, risks, alternatives, and consequences of no treatment; consent must be voluntary. HIPAA protects identifiable health information; share only the minimum necessary for treatment, payment, or operations. Malpractice requires duty, breach of duty, causation, and damages. Report suspected child, elder, or dependent-adult abuse to the designated agency based on reasonable suspicion, not proof.
Records and communication
The record is a legal document: chart objective findings, treatment, materials, and patient responses. Correct paper errors with a single line, date, and initials-never erase or backdate. Use teach-back and plain language, provide interpreters when needed, and protect privacy in waiting rooms and on social media.
Anatomy and terminology
Permanent dentition has 32 teeth; primary dentition has 20. Each tooth has a crown, root, enamel, dentin, pulp, and cementum. Anterior teeth are incisors and canines; posterior teeth are premolars and molars. Occlusion terms include overjet, overbite, crossbite, and midline deviation. ADA-recognized specialties include endodontics, orthodontics, periodontics, prosthodontics, pediatric dentistry, oral and maxillofacial surgery, oral and maxillofacial pathology, oral and maxillofacial radiology, and dental public health.
Office systems
Recall and scheduling systems, CDT procedure codes, insurance claim forms, inventory control, hazard communication, and OSHA training all support clinical care. Know which tasks are administrative and which require clinical authorization.
Worked example
A patient asks you to just do the cleaning because the dentist is running late. You are not credentialed for periodontal debridement in your state. What do you do? The state dental practice act and the dentist's delegation determine what you may perform. Scaling and root planing are clinical procedures with a defined scope; without required training and authorization, decline, explain that the dentist or hygienist will complete it, and offer to check the schedule. Convenience does not override scope of practice.
Traps
Do not give clinical advice outside your scope; do not assume HIPAA prevents all information sharing; do not chart opinions instead of observations; and do not wait for proof before reporting suspected abuse.