What Is CDT-CB?

The Short Answer: What CDT-CB Means

CDT-CB is the shorthand this site uses for the Certified Dental Technician (CDT) credential with the Crown and Bridge specialty. It identifies a dental laboratory technician who has passed national examinations in dental laboratory technology and has additionally demonstrated competence in fixed restorations: crowns, bridges and the cast, milled or pressed frameworks and veneering that go into them.

The "CB" is not an official NBC abbreviation; it is a label for the specialty so candidates can find and discuss it easily. On paper, a technician holds the CDT credential and lists Crown and Bridge as a specialty. If you want the label broken down further, our explainers on what CDT-CB stands for and the meaning of CDT-CB cover the terminology in more depth.

Who Issues the Credential

The National Board for Certification in Dental Laboratory Technology (NBC) administers the CDT program. NBC publishes the CDT Examination Handbook and Application, which spells out eligibility, exam content and policies. The edition used for this article is dated March 1, 2026, with the Crown and Bridge specialty outline appearing on page 24. Always confirm current details against NBC's own handbook before you apply, because policies and fees can change between editions.

For a broader overview of the certification as a career asset, see our page on CDT-CB certification and the more focused what is CDT-CB certification explainer.

The Three-Exam Structure

The credential is not earned through a single test. A technician pursuing the CDT with the Crown and Bridge specialty completes three components:

The components may be taken in any order, but all must be passed within four years of the first pass. An eligible current Recognized Graduate (RG) examination can substitute for the comprehensive component within its four-year allowance. This site's primary focus is the specialty written exam, with supporting material on the practical and the broader certification pathway.

Inside the Specialty Written Exam

The Crown and Bridge written exam is delivered as a computer-based test through FastTest, with remote proctoring through MonitorEDU. Here is what to expect:

• Question count: 90 administered items, of which 80 are scored and 10 are unscored field-test questions. You will not know which are which, so treat every item as if it counts.
• Time limit: 1 hour 30 minutes, with no scheduled break.
• Item style: four-option, single-best-answer multiple choice, including completion-style stems (a sentence that you finish by choosing the best option).
• Rules: closed-book, with no outside assistance, books, dictionaries or scratch paper.
• Passing requirement: NBC supplies the written passing requirement in candidate confirmation information rather than as a published headline number, so check your confirmation materials. Our passing score guide explains how to interpret what you receive.

"Single best answer" matters in this field. Several options can be partly true in a dental laboratory context; the exam rewards the one that is most correct for the situation described, such as the right material, the right sequence or the right correction for a defect. Practicing with realistic items helps you learn to rank plausible options rather than hunt for a single obviously wrong one. You can test yourself with the CDT-CB practice test on the main site.

The Six Blueprint Domains

NBC's specialty outline divides the Crown and Bridge written exam into six domains. NBC publishes percentage ranges, not fixed weights, so the number of questions you see from each area can vary from one exam form to another. The ranges below follow the outline.

Domains 5 and 6 together account for roughly 45-49% of the blueprint by their published ranges, so they deserve a disproportionate share of your attention. For a full walkthrough, read our complete guide to all six content areas.

The Crown and Bridge Practical

The practical component is hands-on. It involves 5 hours 15 minutes of timed work, plus preliminary work completed in advance. The Crown and Bridge practical centers on preliminary work, waxing and metalwork, including preparation of a three-unit bridge.

Three examiners grade the practical work independently, and every required practical subtest must be passed in the same administration. That last point is significant: a strong result in one subtest does not carry a weak result in another.

Practical testing takes place in one of two settings:

• At a suitable dental laboratory with MonitorEDU remote monitoring, or
• At a scheduled volunteer-host group site.

Remote practical windows run in January, March, May, July, September and November. Because the practical involves materials, equipment and sometimes shipping, plan for those costs separately from the exam fee. See our difficulty guide for how candidates tend to experience the written and practical components.

Who Can Sit for It

NBC sets baseline requirements and then offers several documented routes to meet the experience requirement. Every candidate needs:

• A high-school diploma or equivalent
• Working English
• Satisfactory ethical and legal standing
• An NBC-approved technical pathway

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 concurrent education and employment are not double-counted.

Shorter Routes

• 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 combine experience with continuing education: four years plus 75 CE hours, three years plus 150 hours, or two years plus 225 hours.

Under the CE-substitution routes, no more than one-third of hours 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.

What You Submit

Expect to provide education and employment records, supervisor details, CE documentation and job-task mapping. Start gathering these early; documentation gaps are a common source of delay. Our requirements guide goes deeper on each pathway.

Exam Fees and Budgeting

NBC's exam fees for the components are $275 (specialty written), $275 (comprehensive) and $650 (practical). The calculated subtotals are:

These are exam fees only. Budget separately for preparation resources, materials, equipment, applicable shipping, travel, annual renewal and any retakes. A failed written exam requires a new exam fee when you reapply. For the full picture, see our certification cost breakdown.

Windows, Remote Testing and Retakes

Written windows run monthly, with applications due by the 20th of the preceding month. Remote practical windows occur in January, March, May, July, September and November. Our exam dates guide helps you work backward from a target window.

Remote Written Testing Requirements

• A private workspace
• A compatible computer with webcam and audio
• A reliable internet connection
• A smartphone camera
• Photo ID

Accommodations and Retakes

Accommodation requests require supporting documentation and at least 30 days' advance written notice. If you do not pass a written exam, you must wait at least 30 days before reapplying and pay a new exam fee. Because all components must be passed within four years of your first pass, a stretched-out retake cycle can create deadline pressure worth planning around.

Staying Certified: Annual Renewal

The credential is maintained annually. Each year you submit a renewal fee, a legal and ethical attestation and 12 CE hours, broken down as:

• 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 makes holding more than one specialty relatively efficient to maintain once you have earned it.

Where It Fits in a Lab Career

Crown and bridge work is the backbone of many commercial dental laboratories, which is why this specialty is a common choice. Technicians holding the credential typically work in commercial labs, in-house practice labs, prosthodontic or multi-specialty offices and some manufacturing settings. For a closer look at roles, see our guide to CDT-CB jobs.

On pay, the Bureau of Labor Statistics reports a median annual wage of $49,610 for dental laboratory technicians as of May 2025. Treat this strictly as occupation-wide context: it is not a specialty-specific figure and does not measure any pay premium for certification. Our salary guide and the ROI analysis discuss how to think about value without overstating it.

Sequencing Your Preparation

Rather than studying the six domains in the order they appear, weight your schedule by the blueprint and by how foundational each area is. One reasonable sequence:

Adjust the timeline to your own gaps, then confirm your readiness with timed sets on the practice test site. Our study guide and one-page cheat sheet support the final review phase.

Frequently Asked Questions