- What You Are Actually Studying For
- Exam Format and Question Style
- Settle Eligibility Before You Open a Book
- Reading the Blueprint: Where the Points Live
- Domain-by-Domain Mastery Targets
- Study for the Written With the Practical in Mind
- A Six-Week Plan Built Around the Blueprint
- Registration, Fees and Test-Day Logistics
- After You Pass: Renewal and Career Context
- Frequently Asked Questions
- The specialty written exam has 90 questions (80 scored, 10 unscored) in 1 hour 30 minutes, with no scheduled break.
- Finish and Polish the Restoration is the largest domain at 24-26%, followed by Materials and Equipment at 21-23%.
- The specialty written fee is $275; the practical is $650, and an existing CDT adding a specialty budgets $925 in exam fees.
- Confirm your NBC-approved technical pathway before studying; documentation gaps delay applications more than content gaps do.
What You Are Actually Studying For
The credential behind this guide is the Certified Dental Technician (CDT) designation with the Crown and Bridge specialty, awarded by the National Board for Certification in Dental Laboratory Technology (NBC). On this site we label it CDT-CB. If you want the basics before going deeper, our explainers on what CDT-CB certification is and what CDT-CB stands for cover the terminology.
This guide focuses on the specialty written exam, the component most candidates tackle with the least structured preparation. It also connects that exam to the practical, because the two are built on the same body of bench knowledge. Candidates who treat the written test as a vocabulary quiz tend to struggle; it rewards people who can reason through what happens at the bench when a margin, contact, or occlusal surface goes wrong.
Exam Format and Question Style
Knowing the container makes preparation more efficient. Here is what the specialty written component looks like:
| Feature | Specialty Written (Crown and Bridge) |
|---|---|
| Administered questions | 90 (80 scored, 10 unscored field-test items) |
| Time allowed | 1 hour 30 minutes |
| Question type | Four-option, single-best-answer multiple choice, including completion-style stems |
| Delivery | FastTest computer-based testing with MonitorEDU remote proctoring |
| Reference materials | Closed book; no outside assistance, books, dictionaries or scratch paper |
| Breaks | No scheduled break |
| Fee | $275 |
A few practical implications follow from this format. With 90 questions in 90 minutes, you have roughly one minute per item, so you cannot afford to deliberate long over any single stem. The 10 unscored field-test questions are indistinguishable from scored ones, so treat every question as if it counts. And because there is no scratch paper, any process you rely on, such as mentally sequencing a casting workflow, must be something you can run in your head.
"Single best answer" matters too. Several options may sound plausible; the task is to pick the one that is most correct in standard laboratory practice. Completion-style stems ("The primary purpose of the sprue is to...") reward precise definitions. For a fuller sense of how demanding this is, see how hard the CDT-CB exam is.
Settle Eligibility Before You Open a Book
The single most avoidable setback is spending months studying and then discovering your experience documentation does not satisfy NBC. Eligibility requires a high-school diploma or equivalent, working English, satisfactory ethical and legal standing, and an NBC-approved technical pathway. The full breakdown lives in our CDT-CB requirements guide, but here is the shape of the 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 are needed 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. No more than one-third may be self-study, no more than one-third qualified mentoring, and at least one-third must be qualifying NBC or ADA-CERP/AGD education.
Your application packet includes education and employment records, supervisor details, CE documentation and job-task mapping. Mentorship credit requires a certified supervisor and an attestation. Gather these early; supervisors are slow to respond, and a missing signature can push you past the monthly application deadline.
Reading the Blueprint: Where the Points Live
NBC publishes content ranges rather than fixed weights, and it is wise to respect that. The ranges tell you where to invest hours:
| 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% |
Two observations stand out. First, Domains 5 and 6 together make up roughly 45-49% of the exam by range, which means nearly half your score depends on finishing, polishing, materials and equipment knowledge. Many candidates over-study waxing and casting because those feel like the "core" of crown and bridge work, then lose points on materials science and finishing protocols. Second, Domains 1, 2 and 4 are individually modest but collectively substantial, so ignoring them is not a viable shortcut.
For a content-area-by-content-area walkthrough, see our CDT-CB exam domains guide.
Domain-by-Domain Mastery Targets
The Heavy Hitters
Domain 5: Finish and Polish the Restoration (24-26%)
The largest domain. Expect questions about what to evaluate, adjust and refine after the restoration is manufactured, and why each step matters.
- Evaluating and adjusting margins, contacts and occlusion before final polish
- Selecting abrasives and finishing sequences appropriate to the restoration material
- Surface texture, contour and anatomical characterization
- Recognizing finishing errors, such as over-thinning, open margins or altered contours, and knowing how they are prevented
- Infection control and handling considerations for finished work
Domain 6: Selection and Application of Materials and Equipment for Crown & Bridge (21-23%)
The second-largest domain, and the one where memorizing properties alone is not enough. You must match materials and equipment to a clinical or laboratory situation.
- Properties, indications and limitations of the restorative materials used in crown and bridge work
- Investments, casting alloys and ceramics: handling characteristics and compatibility
- Equipment selection and use, including furnaces, casting equipment and milling or printing technology where applicable
- Material safety, storage and handling
- Choosing between traditional and digital workflows for a given case
The Middle Tier
Domain 3: Design and Manufacture Patterns (17-19%)
Pattern work, whether wax or digital, sets the quality ceiling for everything downstream.
- Wax-up principles: anatomy, margin adaptation, contacts and occlusal schemes
- Pontic design and connector dimensions for bridges
- Digital design parameters and how they translate to physical fit
- Spruing, pattern preparation and the reasoning behind each choice
The Supporting Domains
Domains 1, 2 and 4 (9-13% each by range)
These cover the front end and the middle of the workflow.
- Preliminary & Diagnostic Work Up: evaluating the prescription, impressions or scans, and mounted casts; identifying problems before work begins
- Master Cast: die preparation, trimming, margin marking, articulation and digital equivalents
- Manufacture Restoration: casting, pressing, sintering, milling and layering processes, including the physical or digital steps that convert a pattern into a restoration
Study for the Written With the Practical in Mind
This site centers on the specialty written exam, but the credential is not complete without the practical, and the two inform each other. The practical is hands-on: 5 hours 15 minutes of timed work plus advance preliminary work, with focus areas that include preliminary work, waxing and metalwork, including three-unit bridge preparation. It is independently graded by three examiners, and every required practical subtest must pass in the same administration.
Why does that matter for your written preparation? Because the reasoning tested on paper, such as why a connector is sized a certain way or why a margin is finished a certain way, is exactly what examiners evaluate at the bench. Candidates who study the written content while picturing a three-unit bridge from impression to polish retain it better and often discover practical weaknesses early. Practical testing takes place at a suitable dental laboratory with MonitorEDU or at a scheduled volunteer-host group site, so plan logistics well ahead.
Key Takeaway
Use every written-exam topic as a prompt: "How would I demonstrate this on a three-unit bridge?" If you cannot answer, that topic needs hands-on review, not just rereading.
A Six-Week Plan Built Around the Blueprint
Generic schedules fail because they ignore the weights. This plan front-loads the two largest domains and reserves the final week for timed practice. Adjust the length to your experience: seasoned technicians may compress it, while those who have worked in only one workflow (for example, mostly digital) should extend the foundational weeks.
Baseline and Domains 1-2
- Take a diagnostic set of CDT crown and bridge practice questions to find your starting gaps
- Review prescription evaluation, impression and scan assessment, and cast and die preparation
- Note which gaps are knowledge gaps versus reading-speed gaps
Domain 3: Patterns
- Wax-up principles, pontic and connector design, margin adaptation
- Compare traditional and digital pattern design for the same case
Domain 4: Manufacturing the Restoration
- Casting, pressing, sintering and milling processes
- Troubleshooting: causes of defects and the preventive steps for each
Domain 6: Materials and Equipment
- Build comparison tables of materials by indication, strengths and limits
- Review equipment operation, maintenance and safety
Domain 5: Finish and Polish
- Finishing sequences, abrasive selection, contour and occlusal refinement
- Error recognition: what a flawed finish looks like and how it happens
Timed Simulation and Weak-Spot Repair
- Complete full 90-question sets in 90 minutes with no notes and no scratch paper
- Spend remaining hours on missed topics, weighted toward Domains 5 and 6
- Use our CDT-CB cheat sheet for a final fact review
Spaced review, revisiting earlier domains briefly each week, is the only general technique worth adding here, because the exam draws on the whole workflow and early weeks will fade otherwise. For more on structuring prep, our main practice test site offers question sets organized by domain.
Registration, Fees and Test-Day Logistics
What You Will Pay
| Item | Fee (USD) |
|---|---|
| Specialty written exam | $275 |
| Comprehensive exam | $275 |
| Practical exam | $650 |
| Standard three-exam initial route (subtotal) | $1,200 |
| Existing CDT adding a specialty, written plus practical (subtotal) | $925 |
These are exam fees only. Budget separately for preparation, materials, equipment, applicable shipping, travel, renewal and any retakes. Our certification cost breakdown walks through the full picture, and the ROI analysis helps you decide whether the investment fits your goals.
Scheduling Mechanics
- Written windows run monthly, with applications due by the 20th of the preceding month.
- Remote practical windows run in January, March, May, July, September and November.
- Initial components may be taken in any order but must all be passed within four years of the first pass. An eligible current RG examination can substitute for the comprehensive within its four-year allowance.
- Accommodation requests require supporting documentation and at least 30 days' advance written notice.
See CDT-CB exam dates and deadlines for scheduling strategy.
Remote Testing Setup
Remote written testing requires a private workspace, a compatible computer with webcam and audio, reliable internet, a smartphone camera and photo ID. Test your setup well before exam day. Because there is no scheduled break, handle hydration and comfort beforehand, and clear the room of books, notes and anything a proctor could question.
After You Pass: Renewal and Career Context
Certification is annual. Renewal requires a fee, a legal and ethical attestation and 12 CE hours: 1 in Regulatory Standards, 6 in Scientific topics (at least 3 of them NBC-approved) and 5 additional allowable hours. Adding more specialties does not increase the annual CE requirement. Understanding this early helps you pick continuing education that doubles as exam preparation for your next specialty.
On compensation, be careful with expectations. 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 broadly, not the Crown and Bridge specialty and not a certification premium. Certification can influence hiring and advancement, but treat any pay claim you cannot source with skepticism. Our salary guide and article on CDT-CB jobs explore the employer side in more detail.
Frequently Asked Questions
The exam administers 90 questions: 80 scored and 10 unscored field-test items. You have 1 hour 30 minutes, and there is no scheduled break. All questions 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 at 21-23%. Together they account for nearly half the exam by range, so give them the most study time without neglecting the other four domains.
The specialty written is $275, the comprehensive is $275 and the practical is $650. The standard three-exam initial route subtotals $1,200, while an existing CDT adding a specialty through its written and practical exams subtotals $925. Preparation, travel, shipping, renewal and retakes are extra.
No. Sessions are closed book with no outside assistance, books, dictionaries or scratch paper. Remote testing also requires a private workspace, a webcam-equipped computer, a smartphone camera and photo ID.
You must wait at least 30 days before reapplying and pay a new exam fee. Review your weak domains before rebooking, and remember that all initial components must be passed within four years of your first pass.