CDT
Certified Dental Technician (CDT) Certification Examination
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Cheat sheet
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ExploreKey terms
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ExploreStudy plan
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ExploreCommon mistakes
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ExploreCase studies
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ExploreExam-day guide
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ExploreAbout this exam
The Certified Dental Technician (CDT) credential is awarded by the National Board for Certification in Dental Laboratory Technology (NBC), which describes itself as "the independent board founded by the National Association of Dental Laboratories (NADL)." It is aimed at dental laboratory technicians who want to demonstrate "significant mastery of the knowledge and applied skills needed in dental technology" - a benchmark dentists and labs can check through NBC's public CDT directory. NBC also issues the CDL (certified dental laboratory) and RG (recognized graduate) credentials, and its examination program covers all three. Content follows the specialty areas of dental laboratory practice: complete dentures, removable partial dentures, crown and bridge, ceramics, and orthodontics, together with the anatomy, occlusion, and materials science that run through all five. NBC lists computer-based comprehensive written examinations and practical examinations, and posts scheduled remote testing dates - at the time of writing, November 1, December 1, and January 1, with practical and written sittings listed on different tracks. Because the specialty areas are weighted evenly, a weak area cannot be offset by strength elsewhere, so build a study plan that touches every discipline rather than only the one you work in daily. Verify current fees, passing standards, and retake rules with NBC directly. This page is independent study material and is not affiliated with or endorsed by NBC.
What you'll study
About CDT preparation
What does the CDT exam actually test?
NBC frames the credential around "significant mastery of the knowledge and applied skills needed in dental technology." In practice that means the five laboratory disciplines - complete dentures, removable partial dentures, crown and bridge, ceramics, and orthodontics - plus the anatomy, occlusion, and materials knowledge common to all of them. Expect both recall and applied, case-style reasoning.
Is the exam written, practical, or both?
NBC's exam schedule lists a remote computer-based comprehensive written examination and a separate practical examination. Which components you sit depends on the credential you are pursuing and your route to it, so confirm your specific requirement set on the NBC site before you register rather than assuming one sitting covers everything.
Where and when can I take it?
NBC advertises that "Examinations are Everywhere" and lists remote testing dates. Its published upcoming dates include November 1 for remote practical testing and remote comprehensive written testing, then December 1 and January 1 for remote comprehensive written testing. Dates rotate, so check the NBC exam calendar for the current list before planning.
How difficult is the CDT exam?
Candidates generally find it demanding because it spans five disciplines rather than one, and because it tests applied judgment, not just terminology. Technicians who have only worked one specialty are the most exposed. Treat it as a breadth exam: the material you never touch at work is exactly where you need the most structured review.
What score do I need to pass?
NBC does not publish a passing score in the material summarized here, so we do not state one. Passing standards, scoring method, and any scaled-score reporting should be confirmed directly with NBC before you sit the exam. Do not rely on figures from older prep materials - standards are revised and prior numbers frequently circulate long after they change.
Can I retake the exam if I fail?
Retake rules, waiting periods, and any limit on attempts are set by NBC and are not stated in the source material used here. Contact NBC for the current policy before you register, and factor a possible second sitting into your budget and schedule. We deliberately do not guess at this because an outdated policy could cost you time and money.
How should I order my studying?
Start with the discipline you work in least, not most - it is where your score is most at risk. Then build the shared foundation (anatomy, occlusion, materials) because it reinforces every specialty at once. Finish with full-length practice under timed conditions, and review wrong answers by topic so gaps are visible rather than averaged away.
What are the most common failure modes?
Three recur: studying only the specialty you are employed in; memorizing terms without practicing applied, case-style questions; and ignoring the practical component until the last minute. A fourth is relying on stale prep material with outdated exam specifications. Verify the current format on the NBC site first, then build your plan around it.
Does the CDT credential need renewal?
Yes - NBC maintains a MyNBC portal for CDTs, RGs, and CDLs to manage their certifications and offers online renewal, and it points certificants toward continuing education resources, including an approved-course directory. Specific renewal cycles, CE hour requirements, and fees are set by NBC and should be confirmed there, since they are not stated in the source summarized here.