- What a CDT-CB Actually Is
- Who Awards the Credential
- The Three-Exam Structure
- Inside the Specialty Written Exam
- The Six Content Domains
- The Practical Exam: Where Skills Get Graded
- Who Can Sit for It
- What the Exams Cost
- Where a CDT-CB Fits in the Workforce
- Keeping the Credential Active
- A Domain-Driven Starting Plan
- Frequently Asked Questions
- CDT-CB here means Certified Dental Technician, Crown and Bridge specialty, awarded by the National Board for Certification in Dental Laboratory Technology...
- The specialty written exam has 90 administered questions: 80 scored and 10 unscored, in 1 hour 30 minutes.
- Finish and Polish the Restoration is the largest domain at 24-26%, ahead of materials and equipment at 21-23%.
- The three-exam initial route totals $1,200 in exam fees; an existing CDT adding a specialty pays $925.
What a CDT-CB Actually Is
A CDT-CB is a dental laboratory technician who has earned the Certified Dental Technician (CDT) credential and holds the Crown and Bridge specialty. "CDT-CB" is the label this site uses to describe that specialty. It is not an official NBC designation, but it is a convenient shorthand for the credential candidates are actually pursuing: the CDT with a Crown and Bridge specialty examination behind it.
The credential signals that a technician has been tested on both knowledge and hands-on craftsmanship in fixed restorations. That includes waxing and pattern work, metalwork, finishing and polishing, and the selection of materials and equipment. It is a certification of competence in the laboratory, not a license, and it is separate from any state or employer requirement.
Who Awards the Credential
The National Board for Certification in Dental Laboratory Technology (NBC) administers the CDT program and its specialty examinations. NBC publishes the examination handbook and application, defines the eligibility pathways, sets the content outlines, and manages annual renewal. The specialty outline for Crown and Bridge appears in the March 1, 2026 edition of the CDT Examination Handbook and Application.
Because NBC is the single source of truth for the program, anything you read elsewhere about fees, windows, or eligibility should be checked against the current handbook. Policies change between editions, and the handbook is the document that governs your application. For the full qualification rules, see our breakdown of CDT-CB requirements, eligibility and prerequisites.
The Three-Exam Structure
Earning the CDT with a Crown and Bridge specialty involves three components. They may be taken in any order, but all three must be passed within four years of the first pass.
| Component | Format | Exam Fee (USD) |
|---|---|---|
| Specialty written (Crown and Bridge) | 90 administered questions, 1 hour 30 minutes | $275 |
| Comprehensive written | 170 administered questions, 2 hours 45 minutes | $275 |
| Practical | Hands-on, 5 hours 15 minutes timed, plus advance preliminary work | $650 |
The comprehensive component can be substituted by an eligible current Recognized Graduate (RG) examination within its four-year allowance. That is one of several details that make the pathway differ from person to person, which is why reading the handbook matters as much as studying the content.
This site concentrates on the specialty written exam, with supporting material on the practical and the certification pathway.
Inside the Specialty Written Exam
The specialty written exam is a computer-based test delivered through FastTest with MonitorEDU remote proctoring. It contains 90 administered questions in 1 hour 30 minutes. Of those, 80 are scored and 10 are unscored field-test items. You will not be told which are which, so every question deserves full effort.
Items are four-option, single-best-answer multiple choice, including completion-style stems where you finish a partial statement with the best option. The "single best answer" wording matters: more than one option may sound plausible, and your job is to identify the most accurate and complete choice for the situation described.
Testing Conditions
- The session is closed-book. No outside assistance, books, dictionaries or scratch paper are allowed.
- There is no scheduled break during the session.
- Remote testing requires a private workspace, a compatible computer with webcam and audio, a reliable internet connection, a smartphone camera and a photo ID.
- Written windows run monthly, with applications due by the 20th of the preceding month.
Because scratch paper is not permitted, you cannot sketch a margin or work a calculation on paper. Practice reasoning through questions mentally. Our guide to exam dates, testing windows and deadlines explains how to time your application around the monthly cycle.
The Six Content Domains
The Crown and Bridge outline organizes the written exam into six domains. NBC publishes each as a percentage range, and those ranges should be treated as ranges rather than fixed weights. A given exam form may land anywhere inside them.
Domain 1: Perform Preliminary & Diagnostic Work Up (9-11%)
The front end of every case: evaluating the prescription, inspecting impressions or digital scans, and recognizing problems before manufacturing begins.
- Reading and interpreting the case prescription
- Assessing impression or scan quality and spotting defects
- Identifying when a case needs clarification from the dentist
Domain 2: Manufacture Master Cast (Traditional or Digital) (10-12%)
Building an accurate working foundation, whether through conventional stone work or digital workflows.
- Cast fabrication and die preparation concepts
- Articulation and mounting considerations
- Traditional versus digital cast workflow awareness
Domain 3: Design and Manufacture Patterns (Traditional or Digital) (17-19%)
The design stage, where anatomy, contour, margins and occlusion are established in wax or in software.
- Wax pattern anatomy, margins and contacts
- Occlusal scheme and pontic design for bridges
- Digital design and pattern production concepts
Domain 4: Manufacture Restoration (Traditional or Digital) (11-13%)
Converting the pattern or design into the actual restoration through casting, pressing, milling or related processes.
- Investing, burnout and casting or pressing fundamentals
- Milling and digital manufacturing considerations
- Recognizing and correcting manufacturing defects
Domain 5: Finish and Polish the Restoration (24-26%)
The single largest domain. Fit, contour, esthetics, surface quality and final adjustments decide whether a restoration is ready to leave the lab.
- Adjusting contacts, occlusion and marginal fit
- Surface finishing, glazing and polishing principles
- Final quality inspection before delivery
Domain 6: Selection and Application of Materials and Equipment for Crown & Bridge (21-23%)
The second-largest domain. Choosing the right material and the right equipment for the indication, and using both correctly.
- Matching restorative materials to clinical indications
- Equipment selection, use and maintenance
- Material handling and compatibility considerations
Notice how the weight sits at the back end of the workflow. Domains 5 and 6 together account for roughly half the exam by their stated ranges. Candidates who spend most of their prep on waxing and casting, the parts of the job many technicians enjoy most, can leave a large share of the exam under-prepared. For a deeper look, read our complete guide to all six content areas.
Key Takeaway
Finish and Polish the Restoration and Selection and Application of Materials and Equipment are the two heaviest domains. Give them the largest share of your review time, then use the earlier workflow domains to build the context that makes those questions easier to reason through.
The Practical Exam: Where Skills Get Graded
The written exam proves what you know. The practical proves what you can do. It involves 5 hours 15 minutes of timed hands-on work plus advance preliminary work completed before the timed session. The practical focus areas are preliminary work, waxing and metalwork, including three-unit bridge preparation.
Delivery options include testing at a suitable dental laboratory with MonitorEDU, or at a scheduled volunteer-host group site. Remote practical windows run in January, March, May, July, September and November.
How Practical Work Is Graded
Practical work is independently graded by three examiners, and every required practical subtest must pass in the same administration. That last point is important: a strong result on one subtest does not offset a failing result on another within the same sitting. Candidates should plan to be consistent across the whole practical, not just excellent in their favorite phase.
The practical fee is $650, the largest single line in the exam budget, which makes a first-time pass worth planning for. Our article on how hard the CDT-CB exam is discusses where candidates tend to struggle across the written and practical components.
Who Can Sit for It
Eligibility has a baseline and a pathway. The baseline is a high-school diploma or equivalent, working English, and satisfactory ethical and legal standing. On top of that, you need an NBC-approved technical pathway.
Standard and Alternative Pathways
- Standard pathway: five years of documented dental-technology education, training and/or experience. Full-time employment means at least 35 hours per week, and concurrent education and employment is not double-counted.
- Two-year CODA program graduates: may qualify with two additional nonconcurrent years of practical experience.
- Current Recognized Graduates (RGs): if the qualifying examination was passed within four years, no additional experience is needed after a two-year CODA program, or three on-the-job years after a non-CODA program.
- CE-substitution pathways: four years plus 75 CE hours, three years plus 150 hours, or two years plus 225 hours.
The CE-substitution pathways carry composition limits: no more than one-third self-study, no more than one-third qualified mentoring, and at least one-third qualifying NBC or ADA-CERP/AGD education. You will submit education and employment records, supervisor details, CE documentation and job-task mapping. Mentorship requires a certified supervisor and an attestation.
What the Exams Cost
Exam fees are published in USD, and two subtotals are worth knowing.
| Route | What's Included | Exam-Fee Subtotal |
|---|---|---|
| Standard three-exam initial route | Specialty written ($275) + comprehensive ($275) + practical ($650) | $1,200 |
| Existing CDT adding a specialty | Specialty written ($275) + practical ($650) | $925 |
These are exam fees only. Budget separately for preparation materials, equipment, applicable shipping, travel, renewal and retakes. If a written attempt is unsuccessful, you must wait at least 30 days before reapplying and pay a new exam fee. For a full picture of the financial side, see our complete pricing breakdown.
Where a CDT-CB Fits in the Workforce
Crown and bridge work is core to fixed prosthetics, and the technicians who do it are employed in dental laboratories of many sizes, from small independent labs to larger production facilities. Specific hiring practices vary by employer, and this credential is not a universal requirement. Some employers value it as evidence of verified skill; others weigh experience and portfolio more heavily.
On compensation, the Bureau of Labor Statistics reports a $49,610 median annual wage for dental laboratory technicians as of May 2025. That figure describes the occupation as a whole. It is not specific to the Crown and Bridge specialty, and it should not be read as a certification premium. How much a credential changes your pay depends on your employer, your region and your role. Our earnings analysis and ROI discussion walk through how to evaluate that for your own situation, and the CDT-CB jobs overview covers the employment side.
Keeping the Credential Active
Certification is not a one-time event. Renewal is annual and includes a renewal fee, a legal and ethical attestation, and 12 CE hours composed as follows:
- 1 hour of Regulatory Standards
- 6 hours of Scientific content, including at least 3 NBC-approved hours
- 5 additional allowable hours
Holding additional specialties does not increase the annual CE requirement, which keeps ongoing obligations manageable for technicians who add credentials over time.
A Domain-Driven Starting Plan
Rather than a generic schedule, let the blueprint decide where your hours go. This is a starting sketch; adjust it to your own gaps and exam date.
Workflow Foundations
- Domains 1, 2 and 4: preliminary work-up, master cast and restoration manufacture
- Build the sequence of the case so later questions have context
Pattern Design
- Domain 3: pattern design and manufacture, traditional and digital
- Focus on margins, contacts, occlusion and pontic design
The Heavy Hitters
- Domain 5: finish and polish; Domain 6: materials and equipment
- Spend the most time here, since these carry the largest ranges
Timed Practice
- Full 90-question sets in 90 minutes with no notes
- Review misses by domain and revisit the weakest one
Because there is no break and no scratch paper, practice in the same conditions you will face. The full study guide expands on resources and pacing, and the one-page cheat sheet is useful for last-pass review. When you are ready to test yourself, try the CDT-CB practice questions and use the results to see which domains need more attention.
Frequently Asked Questions
On this site, CDT-CB refers to the Certified Dental Technician credential with the Crown and Bridge specialty, administered by the National Board for Certification in Dental Laboratory Technology (NBC). It is a site label rather than an official NBC abbreviation.
The exam has 90 administered questions: 80 scored and 10 unscored field-test items. You have 1 hour 30 minutes, with no scheduled break and no scratch paper.
Finish and Polish the Restoration is the largest at 24-26%, followed by Selection and Application of Materials and Equipment for Crown and Bridge at 21-23% and Design and Manufacture Patterns at 17-19%. These are NBC's ranges, not fixed weights.
The standard three-exam initial route totals $1,200 in exam fees ($275 specialty written, $275 comprehensive, $650 practical). An existing CDT adding a specialty pays $925. Preparation, travel, shipping, renewal and retakes are additional.
You must wait at least 30 days before reapplying and pay a new exam fee. Remember that all initial components must be passed within four years of the first pass.