The ACJ will be offered at Prometric test centres in Canada and in select international centres including New Zealand, Australia, Belgium, and England.

Assessments administered in New Zealand and Australia will be held the day after the assessment in Canada.


To register for the assessment, login to your online profile.   

Following the registration deadline, participants will receive a correspondence from the NDEB with information on how to schedule their assessment with Prometric.


If you wish to withdraw from the ACJ, you must contact the NDEB office at and not the Prometric centre. Once your withdrawal request is submitted, the NDEB will communicate with Prometric to cancel your registration. For information about withdrawal fees, visit the fees page.

Format and Content


The Assessment of Clinical Judgement (ACJ) is a 5 ½ hour assessment with one scheduled 30-minute break. The assessment consists of 120-150 single-answer and multi-answer multiple choice type questions.

Each section of the ACJ will contain case-based diagnosis, treatment planning and clinical decision making questions, and radiographic interpretation questions. Both question types will be found throughout the Assessment.

Case-based diagnosis, treatment planning and clinical decision making questions  evaluate your ability to formulate a diagnosis and to make clinical decisions. Case histories, dental charts, radiographic images, and photographs may be provided.

Radiographic interpretation questions evaluate your knowledge in oral radiology and ability to make a radiographic interpretation and diagnosis using radiographic images.

The assessment will be administered electronically at Prometric test centres. The NDEB’s e-Exam Orientation should be viewed prior to taking the ACJ.

The ACJ Question and Answer Framework containing examples of questions is available in the Reference Materials & Resources section. You are strongly encouraged to visit the website in preparation for the ACJ.

Sample Questions

The following examples illustrate the format of assessment questions.

Single correct Answer

Some questions have one correct answer, indicated by the direction “Select ONE correct answer”. Select the most likely answer or the most appropriate answer.

Question: 1 (Select ONE correct answer.)
Which of the following is the most likely diagnosis for the entity shown in the photograph?

One or More Correct Answers

Some questions have one or more correct answers, indicated by the direction “Select ONE OR MORE correct answers”. Select all answers that are correct.  The maximum score for any question is one (“1”). The minimum score for any question is zero (“0”). Part marks will be awarded if some, but not all correct answers are selected, provided no incorrect answer is selected.  Marks will be deducted for incorrect responses, but no question will receive a score less than zero (“0”).  Some answers are neither definitely correct nor incorrect and have been given a value of zero (“0”). Selecting one of these answers will not affect the score given to a participant. But, if a definitely incorrect answer is selected the participant will receive a zero (“0”) score for the entire question.

Question: 2


The NDEB updates examination and assessments questions on a regular basis as new knowledge becomes available.


Examinations administered in 2021 will use the 2018 American Academy of Periodontology (AAP) disease classification. The 1999 AAP old term may be included in brackets after the new term when applicable.

Example: supracrestal tissue attachment (biologic width).

ACJ Protocol

The protocol contains important information regarding the ACJ. This document should be read carefully.

Download the 2021 ACJ Protocol.


Assessment results are electronically processed. Results are then verified manually at least three times. An additional verification is done of all results close to the passing score before they are released to participants.

A test equated, re-scaled score of 75 or greater is reported as a Pass. A test equated, re-scaled score of less than 75 is reported as a Fail. Results will include the test equated, re-scaled score. No further breakdown of results is available.

Passing Standard

In order to ensure the consistency of scores on all the versions of the assessment, the NDEB uses a test equating procedure. This procedure correlates a standardized reference assessment with the current version of the assessment and determines the standardized mark. The NDEB maintains a standardized passing score of 75 on all assessments and examinations. 

For more information regarding the processes used to select questions and analyze and test equate assessments and examinations please download Information Regarding Test Equating

Participants can take the ACJ a maximum of three times.

Appeals and Rescores

Details on appeals and rescores can be found in the Appeals section of our website.