What Is CDT-CB Certification?

What the Credential Actually Is

CDT-CB certification is the Certified Dental Technician (CDT) credential earned in the Crown and Bridge specialty. "CDT-CB" is the label this site uses for it. It signals that a dental laboratory technician has been independently tested on the knowledge and bench skills involved in fabricating fixed restorations, from the initial case work-up through finishing and polishing.

It is not a degree, a state license, or a generic dental-assisting certificate. It is a professional certification that a technician earns by meeting eligibility requirements and passing a series of examinations, then maintains through annual renewal. If you are brand new to the terminology, our overview pages on what CDT-CB is and what CDT-CB stands for cover the basics in short form, while this article walks through the full structure of the credential.

Who Certifies It and Why That Matters

The credential is administered by the National Board for Certification in Dental Laboratory Technology, usually shortened to NBC. NBC publishes the CDT Examination Handbook and Application, defines the specialty exam outline, reviews your documentation, and issues the CDT designation. Because NBC sets the rules, every concrete detail a candidate needs, including the written passing requirement, comes from NBC rather than from third-party sites. The passing requirement is supplied in candidate confirmation information, so verify it there. Our page on the CDT-CB passing score explains how to find and interpret it.

Always treat the current NBC handbook as the authority. Fees, windows and procedures can be updated, and the figures in this article reflect the March 1, 2026 handbook.

The Three Exam Components

A first-time candidate in the standard route completes three exams. They may be taken in any order, but all three must be passed within four years of the first pass.

The standard three-exam initial route therefore totals $1,200 in exam fees. A technician who already holds a CDT and wants to add Crown and Bridge as an additional specialty takes the specialty written and the practical only, for $925. An eligible current Recognized Graduate (RG) examination can substitute for the comprehensive component within its four-year allowance, which changes the route for graduates of qualifying programs.

This site concentrates on the specialty written exam, with supporting material on the practical and the broader certification pathway. For a full breakdown of what each route costs once you add materials and travel, see our CDT-CB certification cost guide.

How the Specialty Written Exam Is Built

The Crown and Bridge written exam is delivered on the FastTest computer-based platform with MonitorEDU remote proctoring. Items are four-option, single-best-answer multiple choice, and some use completion-style stems, where you pick the option that best finishes a sentence rather than answering a direct question.

Of the 90 questions you see, 80 are scored and 10 are unscored field-test items. You will not be told which are which, so every question deserves full effort. With 1 hour 30 minutes for 90 items, pacing is about one minute per question, which rewards recall and fast discrimination between plausible options more than long calculation.

Wondering how demanding this is? Our difficulty guide and the pass rate discussion address that honestly, without inventing numbers NBC has not published.

What the Blueprint Tests

The specialty outline divides the exam into six domains, each with a percentage range. These are ranges, not fixed weights, so do not assume your exam will contain an exact count of items per domain.

The remaining domains, Preliminary & Diagnostic Work Up, Master Cast, and Manufacture Restoration, together make up a substantial share of the exam and should not be neglected. They are the foundation: a flaw introduced at the cast or case-evaluation stage carries through every later step. For a deeper walk through each area, see the complete guide to all six CDT-CB domains.

Note that Domains 2 through 4 explicitly span traditional and digital workflows. A candidate who has worked only in one environment should deliberately study the other.

The Practical Exam: Bench Work Under Observation

The practical is where the credential differs most from a typical multiple-choice certification. It is a hands-on exam with 5 hours 15 minutes of timed work, plus preliminary work that is completed in advance. NBC's practical focus areas are preliminary work, waxing and metalwork, including preparation of a three-unit bridge.

Delivery has two options: testing at a suitable dental laboratory with MonitorEDU remote proctoring, or at a scheduled volunteer-host group site. Remote practical windows run in January, March, May, July, September and November.

Your work is independently graded by three examiners, and every required practical subtest must be passed in the same administration. That last rule matters: strong results in most subtests do not carry a weak one across to a later sitting. Plan for consistency across the whole bench sequence rather than excellence in a favorite area.

Eligibility and Documentation

You cannot simply register and test. NBC requires you to qualify first. Baseline requirements are a high-school diploma or equivalent, working English, satisfactory ethical and legal standing, and 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 time where education and employment overlap is not double-counted.

Alternatives for program graduates and CE

• Two-year CODA program graduates may qualify with two additional nonconcurrent years of practical experience.
• Current Recognized Graduates 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 are 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.

Expect to submit education and employment records, supervisor details, CE documentation and job-task mapping. Mentorship credit requires a certified supervisor and an attestation. Start gathering records early, since missing paperwork is a common source of delay. Our CDT-CB requirements guide goes through each pathway step by step.

Exam Fees and Budgeting

These are exam-fee subtotals only. Preparation, study materials, bench equipment, applicable shipping, travel, renewal and any retakes should be budgeted separately. If a written attempt is unsuccessful, you pay a new exam fee on reapplying, so strong preparation is also a financial decision.

Scheduling, Remote Testing and Retakes

Written windows run monthly, with applications due by the 20th of the preceding month. That deadline structure means you should decide on a target month well before you feel ready, then work backward. Details and planning advice are in our exam dates and deadlines guide.

Remote written testing has specific logistics:

• A private workspace
• A compatible computer with webcam and audio
• A working internet connection
• A smartphone camera
• Valid photo ID

Test your setup in advance. Technical problems on exam day are avoidable stress.

If you need testing accommodations, submit supporting documentation and give at least 30 days' advance written notice. Candidates who do not pass the written exam must wait at least 30 days before reapplying and must pay a new exam fee.

Staying Certified: Annual Renewal

The CDT credential renews annually. Each year you pay a renewal fee, complete a legal and ethical attestation, and document 12 CE hours:

• 1 hour in Regulatory Standards
• 6 hours in Scientific content, including at least 3 NBC-approved hours
• 5 additional allowable hours

A useful feature for technicians who collect specialties over time: additional specialties do not increase the annual CE requirement. Holding Crown and Bridge alongside other specialties still means 12 hours a year.

Career Context and Pay

Certified technicians work primarily in dental laboratories, from small independent labs to larger production environments, and in settings that fabricate restorations for dental practices. Certification can strengthen a candidacy where employers value demonstrated, independently verified skill, and it can support moves into lead, quality-control or training roles. Our CDT-CB jobs page explores where certificants tend to work.

On pay, be careful with claims. The U.S. Bureau of Labor Statistics reported a median annual wage of $49,610 for dental laboratory technicians in May 2025. That figure describes the occupation as a whole. It is not a Crown and Bridge specialty wage and it is not a measured premium for holding a CDT. Individual earnings depend on region, employer, experience and role. For a fuller discussion, read the salary guide and the ROI analysis.

Sequencing Your Preparation by Domain

The blueprint tells you where the points are. A sensible plan front-loads the heavy domains while keeping the foundational ones warm. Here is one way to sequence an eight-week written-exam preparation, adjustable to your experience.

Domains 5 and 6 together account for roughly 45-49% of the exam by their ranges, which is why they get dedicated attention and are revisited during simulations. Because we cannot assume you have equal strength everywhere, use a diagnostic set early to adjust the order. For full study resources, see the CDT-CB study guide and the one-page cheat sheet, and when you are ready to test yourself under realistic conditions, use the CDT-CB practice tests on the main site.

Frequently Asked Questions