- What the CDT-CB Certification Actually Is
- Eligibility Pathways: Getting Approved to Test
- Exam Components, Format and Delivery
- The Six Domains and Where the Points Are
- The Practical Exam: Preliminary Work, Waxing and Metalwork
- Fees and Budget Mechanics
- Testing Windows, Retakes and the Four-Year Clock
- Sequencing Your Preparation Around the Blueprint
- Renewal and Career Context
- Frequently Asked Questions
- CDT-CB is the Crown and Bridge specialty of the Certified Dental Technician credential awarded by the National Board for Certification (NBC).
- 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 standard three-exam initial route totals $1,200 in exam fees; an existing CDT adding a specialty pays $925.
What the CDT-CB Certification Actually Is
"CDT-CB" is the label this site uses for the Crown and Bridge specialty of the Certified Dental Technician (CDT) credential. The credential is issued by the National Board for Certification in Dental Laboratory Technology (NBC). It is a certification for working dental laboratory technicians, not a degree and not a state license, and it is built around the craft of fabricating fixed restorations: crowns, bridges and the cast, pattern and finishing work behind them.
If you are still sorting out terminology, our explainers on what CDT-CB certification is and what CDT-CB stands for cover the naming in more detail. This article is the practical overview: how you qualify, what the exams look like, what they cost, and how to organize your preparation.
The credential is structured in components. A candidate completes a comprehensive written exam, a specialty written exam (here, Crown and Bridge), and a hands-on practical exam. Because the specialty is a distinct exam, a technician who already holds a CDT in another specialty can add Crown and Bridge without repeating the comprehensive component. This site focuses on the specialty written exam and supports it with practical-exam and certification-pathway guidance.
Eligibility Pathways: Getting Approved to Test
Before you can sit for any exam, NBC must approve your application. The baseline requirements are a high-school diploma or equivalent, working English, satisfactory ethical and legal standing, and an NBC-approved technical pathway. The pathway is where candidates most often have questions, so it is worth laying out clearly. Our full breakdown lives in the CDT-CB requirements guide; the essentials are below.
The standard pathway
The standard route requires five years of documented dental-technology education, training and/or experience. Full-time employment means at least 35 hours per week, and education and employment that overlap in time are not double-counted. If you studied and worked at the same time, only one of those periods counts for that stretch.
CODA program graduates and Recognized Graduates
- Two-year CODA program graduates may qualify with two additional, nonconcurrent years of practical experience.
- Current Recognized Graduates (RGs) whose qualifying examination was passed within four years need no additional experience after a two-year CODA program, or three on-the-job years after a non-CODA program.
CE-substitution pathways
Continuing education can substitute for part of the experience requirement:
| Experience Years | Plus CE Hours |
|---|---|
| 4 years | 75 CE hours |
| 3 years | 150 CE hours |
| 2 years | 225 CE hours |
Within the CE hours, no more than one-third may be self-study, no more than one-third may be qualified mentoring, and at least one-third must be qualifying NBC or ADA-CERP/AGD education. Mentorship requires a certified supervisor and an attestation.
Exam Components, Format and Delivery
There are three exam components in the full route, and each has its own format.
| Component | Format | Time | Fee (USD) |
|---|---|---|---|
| Specialty Written (Crown and Bridge) | 90 administered questions: 80 scored, 10 unscored field-test | 1 hour 30 minutes | $275 |
| Comprehensive Written | 170 administered questions: 160 scored, 10 unscored | 2 hours 45 minutes | $275 |
| Practical | Hands-on work plus advance preliminary work | 5 hours 15 minutes of timed work | $650 |
Question style
Written items are four-option, single-best-answer multiple choice, and some use completion-style stems, where you finish a sentence rather than answer a direct question. "Single best answer" is important: more than one option may be partially defensible, and your job is to choose the one that best fits accepted laboratory practice. The 10 unscored items are field-test questions mixed in with scored ones, and you cannot tell which are which, so treat every question seriously.
For a sense of how hard that format feels in practice, see how hard the CDT-CB exam is.
Delivery and testing rules
Written exams are delivered by FastTest as computer-based tests with MonitorEDU remote proctoring. Sessions are closed-book: no outside assistance, books, dictionaries or scratch paper, and there is no scheduled break. Remote testing requires:
- A private workspace
- A compatible computer with webcam and audio
- A reliable internet connection
- A smartphone camera
- Photo ID
Practical testing takes place either at a suitable dental laboratory with MonitorEDU or at a scheduled volunteer-host group site. Candidates needing accommodations must submit supporting documentation and give at least 30 days' advance written notice.
On scoring, NBC supplies the written passing requirement in candidate confirmation information rather than publishing a single figure here. Our passing score guide explains how to find and interpret what NBC provides.
The Six Domains and Where the Points Are
The Crown and Bridge specialty outline divides the written exam into six domains, each with a percentage range. These are ranges, not fixed weights, and you should treat them as such: the exact number of questions from each domain can vary between exam forms.
| Domain | Weight Range |
|---|---|
| 1. Perform Preliminary & Diagnostic Work Up | 9-11% |
| 2. Manufacture Master Cast (Traditional or Digital) | 10-12% |
| 3. Design and Manufacture Patterns (Traditional or Digital) | 17-19% |
| 4. Manufacture Restoration (Traditional or Digital) | 11-13% |
| 5. Finish and Polish the Restoration | 24-26% |
| 6. Selection and Application of Materials and Equipment for Crown & Bridge | 21-23% |
Three domains, Finish and Polish, Materials and Equipment, and Pattern Design, together make up the bulk of the exam. A deeper walkthrough of each area is available in the complete guide to the six content areas.
Domain 5: Finish and Polish the Restoration (24-26%)
The single largest domain, and one that rewards hands-on familiarity. Expect questions about the final stages of fabrication and what makes a restoration ready for delivery.
- Finishing and polishing sequences for different restorative materials
- Evaluating contacts, occlusion and margins before delivery
- Surface texture, contour and esthetic finishing decisions
- Recognizing and correcting defects introduced during finishing
Domain 6: Selection and Application of Materials and Equipment (21-23%)
Second in weight, this domain tests whether you can match the right material and equipment to the case and use both correctly.
- Material selection for crown and bridge frameworks and veneering
- Proper use, handling and limitations of laboratory equipment
- Material properties and how they influence processing choices
- Safe and correct application of materials throughout fabrication
Domain 3: Design and Manufacture Patterns, Traditional or Digital (17-19%)
Pattern work is where design judgment shows. Both traditional waxing and digital design workflows fall within the domain name.
- Wax-up principles: anatomy, contour, contacts and occlusal scheme
- Pontic and connector design for bridges
- Digital design considerations where the workflow applies
- Spruing and pattern preparation for the next stage
The Practical Exam: Preliminary Work, Waxing and Metalwork
The practical is a hands-on exam with 5 hours 15 minutes of timed work, plus preliminary work completed in advance. Its focus areas are preliminary work, waxing and metalwork, and the task set includes preparing a three-unit bridge. Remote practical windows run in January, March, May, July, September and November.
Two features set the practical apart from the written exam:
- Independent grading by three examiners. Your work is assessed separately by three people, so the result does not hinge on one reviewer's preferences.
- Every required subtest must pass in the same administration. A strong waxing result does not offset a failed subtest elsewhere. If any required subtest fails, you do not carry forward partial credit within that administration.
That second rule changes how you should prepare. Candidates sometimes concentrate on their strongest skill and neglect their weakest, but the pass requirement rewards evenness. Practice the full sequence under timed conditions, and identify your slowest subtest early.
Key Takeaway
Treat the practical as a consistency test, not a showcase. Time yourself on the complete three-unit bridge sequence and fix your weakest subtest first, because one failing subtest sinks the whole administration.
Because the practical is its own discipline, you may find it useful to compare it with the written exam in our CDT-CB study guide, which addresses how the two interact in a preparation plan.
Fees and Budget Mechanics
NBC exam fees, in USD, are $275 for the specialty written, $275 for the comprehensive, and $650 for the practical. The calculated subtotals depend on your route:
| Route | Exams Included | Exam-Fee Subtotal |
|---|---|---|
| Standard three-exam initial route | Comprehensive + specialty written + practical | $1,200 |
| Existing CDT adding a specialty | Specialty written + practical | $925 |
Those subtotals cover exam fees only. Budget separately for preparation, materials, equipment, applicable shipping, travel, renewal and retakes. A failed written attempt requires a new exam fee, so a realistic budget includes some contingency. The CDT-CB certification cost breakdown walks through these line items, and the ROI analysis helps you weigh them against career goals.
Testing Windows, Retakes and the Four-Year Clock
Written exam timing
Written windows run monthly, with applications due by the 20th of the preceding month. Plan backward from your target window rather than waiting until you feel ready, since a missed deadline pushes you a full month. See the exam dates and deadlines guide for scheduling detail.
Retakes
Candidates who fail a written exam must wait at least 30 days before reapplying and must pay a new exam fee. Use that waiting period diagnostically: review the performance feedback you receive and map weak areas back to the six domains.
The four-year window
Initial components may be taken in any order, but all must be passed within four years of the first pass. An eligible current RG examination can substitute for the comprehensive within that four-year allowance. This flexibility lets you sequence exams around your work schedule, but it also creates a deadline. If you pass the specialty written early and then delay the practical, the clock is running the whole time.
Sequencing Your Preparation Around the Blueprint
The blueprint tells you where to spend time. Rather than a generic schedule, allocate weeks to match domain weight and your own gaps. Here is one way to sequence an eight-week written-exam plan for a working technician:
Domain 5 and Domain 6 foundations
- Start with the two heaviest domains (24-26% and 21-23%) while energy is highest
- Build lists of materials, equipment and finishing sequences you can recall without notes
Domain 3 pattern design
- Review wax-up anatomy, contacts, pontic and connector design
- Add the digital design workflow concepts if your lab is conventional
Domains 1, 2 and 4
- Cover preliminary work-up, master cast and restoration manufacture
- Study both traditional and digital versions of each
Timed practice and gap closing
- Take timed sets of 90 questions in 90 minutes, closed-book, with no scratch paper
- Revisit your weakest domain before test day
The timed sets in the final weeks should mimic the real conditions: no notes, no scratch paper and no break. If you want question-style practice, the CDT-CB practice test is a good place to rehearse single-best-answer items, and our one-page cheat sheet works well as a final-week review. Additional practice questions are available on the main practice site.
Renewal and Career Context
Annual renewal
The CDT credential renews annually. Each renewal involves a renewal fee, a legal and ethical attestation, and 12 CE hours:
- 1 hour of Regulatory Standards
- 6 hours of Scientific content, including at least 3 NBC-approved hours
- 5 additional allowable hours
Adding further specialties does not increase the annual CE requirement, which is a practical advantage for technicians who plan to broaden their certifications over time.
Salary and job context
The U.S. Bureau of Labor Statistics reports a median annual wage of $49,610 for dental laboratory technicians as of May 2025. Treat that as occupation-wide context only. It is not a figure for Crown and Bridge specialists, and it does not measure any pay premium attached to holding a CDT. Individual outcomes depend on employer, region and role. For a fuller discussion, see the salary guide and the overview of CDT-CB jobs. Candidates weighing the investment should also read the worth-it analysis.
Frequently Asked Questions
The specialty written exam has 90 administered questions: 80 scored and 10 unscored field-test items. You have 1 hour 30 minutes, and all items are four-option, single-best-answer multiple choice, including completion-style stems.
Finish and Polish the Restoration is the largest at 24-26%, followed by Selection and Application of Materials and Equipment for Crown & Bridge at 21-23% and Design and Manufacture Patterns at 17-19%. These are NBC's ranges, not fixed weights.
Fees are $275 for the specialty written, $275 for the comprehensive and $650 for the practical. That is $1,200 for the standard three-exam initial route, or $925 for an existing CDT adding a specialty through its written and practical exams. Preparation, shipping, travel, renewal and retakes are extra.
You must wait at least 30 days before reapplying and pay a new exam fee. Initial components must all be passed within four years of your first pass, so factor retakes into that deadline.
Annual renewal requires a renewal fee, a legal and ethical attestation and 12 CE hours: 1 Regulatory Standards, 6 Scientific (at least 3 NBC-approved) and 5 additional allowable hours. Adding specialties does not raise the CE requirement.
For a broader introduction to the credential, start with what CDT-CB is, then move to the study guide when you are ready to build your plan. Always confirm current fees, dates and eligibility details against the NBC CDT Examination Handbook and Application and the NBC website, since policies can change between cycles.