- NBC supplies the written passing requirement in your candidate confirmation information, so verify it there rather than trusting a number from a forum.
- The CDT-PD written exam administers 90 questions, but only 80 are scored; 10 are unscored field-test items.
- The practical is graded by three examiners, and all four grading groups must pass in the same administration.
- Survey, Design and Preparation for Framework is the largest domain at 25-27% of the blueprint.
What the Passing Score Actually Is for CDT-PD
Candidates searching for the "CDT-PD passing score" usually want one number: the percentage they must hit on exam day. Here is the honest answer for Certified Dental Technician - Partial Dentures: the National Board for Certification in Dental Laboratory Technology (NBC) supplies the written passing requirement in the candidate confirmation information you receive after your application is processed. It is not something to guess from a blog, a study group, or a screenshot of someone's score report.
That matters because many unofficial sources recycle a round-number cutoff and present it as fact. Any figure that does not come from NBC's own candidate materials should be treated as unverified. This article does not invent a cutoff. Instead, it shows you how the score is built, what is actually being counted, and how to prepare so the exact threshold becomes a non-issue.
If you are still working out whether you qualify to sit for the exam at all, start with our guide to CDT-PD requirements and eligibility before worrying about scoring.
The Written Exam Format Behind the Score
Understanding what goes into your score starts with the structure of the specialty written exam. The CDT-PD written component is a FastTest computer-based exam delivered with MonitorEDU remote proctoring.
- 90 administered questions in 1 hour 30 minutes.
- 80 scored items and 10 unscored field-test items mixed in.
- Four-option, single-best-answer multiple choice, including completion-style stems.
- Closed-book: no outside assistance, books, dictionaries, or scratch paper, and no scheduled break.
Why the unscored items matter to your strategy
You cannot tell which 10 questions are field-test items, and they look identical to scored ones. The practical consequence: never abandon a question because it "feels" experimental. Treat all 90 as if they count. Some candidates burn time and confidence on a strange-looking item, assuming it is unscored, then rush items that actually decide the result.
Pacing at one minute per question
With 90 questions in 90 minutes, you have an average of one minute per item. Because there is no scheduled break and no scratch paper, any calculation or visualization has to happen in your head or on the screen. Practice questions that require mentally rotating a cast, picturing a path of insertion, or sequencing a processing step, because the test will ask you to reason spatially without paper.
For a deeper look at how demanding this format feels in practice, see how hard the CDT-PD exam really is.
How the Practical Is Graded: Four Groups, No Compensation
The written exam gets most of the "passing score" attention, but the practical is where the scoring logic is least forgiving. It is a hands-on exam with 5 hours 15 minutes of timed work plus advance preliminary work, and it is independently graded by three examiners.
The key rule: every required practical subtest must pass in the same administration. Strength in one area does not offset weakness in another.
| Practical Grading Group | What It Reflects | Can Another Group Compensate? |
|---|---|---|
| Preliminary work | Advance cast and framework preparation completed before the timed session | No - must pass on its own |
| Design | Timed design decisions on the partial denture framework | No - must pass on its own |
| Waxing | Waxing work, including wrought-wire clasp joining context | No - must pass on its own |
| Metalwork | Metal finishing quality | No - must pass on its own |
Practical content is covered in more depth in our CDT-PD study guide, including how written knowledge and bench skills reinforce each other.
Where Your Scored Items Come From
Your written result is a function of how well you perform across the NBC content outline for the Partial Dentures specialty. NBC publishes percentage ranges rather than fixed weights, and it is important to preserve that nuance: a domain listed at 25-27% does not mean exactly 26% of your items, and two candidates may see slightly different distributions.
| Domain | Blueprint Range |
|---|---|
| 1. Create Master Casts from Stock and/or Custom Tray Impressions | 6-8% |
| 2. Survey, Design and Preparation for Framework (Traditional or Digital) | 25-27% |
| 3. Manufacture Refractory Cast | 3-5% |
| 4. Manufacture Partial Dentures Frameworks | 10-12% |
| 5. Select and Arrange Artificial Teeth and Process | 9-11% |
| 6. Finish and Polish Partial Denture Base | 9-11% |
| 7. Procedures for Repairs and Alterations for Partial Dentures | 11-13% |
| 8. Selection and Application of Materials and Equipment | 18-20% |
The two domains that carry the most weight
Domain 2: Survey, Design and Preparation for Framework
The largest domain at 25-27%. It spans both traditional and digital approaches, so you need to be comfortable reasoning about the framework regardless of workflow.
- Surveying a master cast and establishing a path of insertion
- Identifying undercuts, guide planes, and rest seat locations
- Designing major and minor connectors, clasp assemblies, and retention
- Preparing the cast for framework fabrication
- Translating a design into traditional or digital workflow steps
Domain 8: Selection and Application of Materials and Equipment
At 18-20%, this is the second-largest domain and the one candidates most often under-study because it feels like "common knowledge."
- Choosing appropriate materials for a given step or situation
- Selecting and using laboratory equipment correctly
- Matching material properties to the task at hand
- Recognizing why a material or equipment choice fails a procedure
Together, these two domains account for roughly 43-47% of the outline by range. Weakness here is very hard to offset elsewhere. For a domain-by-domain walkthrough, read our complete guide to all 8 CDT-PD content areas.
Passing Across Components: Timing and Retakes
A "passing score" for the CDT-PD specialty is only one piece of earning the credential. NBC structures initial certification as multiple components, and the rules about when and how you pass them matter as much as any single cutoff.
- Initial components may be taken in any order.
- All components 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.
- The comprehensive component is separate from the specialty written: 170 administered questions (160 scored, 10 unscored) in 2 hours 45 minutes.
Key Takeaway
Because the clock runs from your first pass, do not pass one component and then let months drift. Map out your sequence of written specialty, comprehensive, and practical early, and align it to the monthly written windows and the bimonthly remote practical windows.
Scheduling details, including application deadlines on the 20th of the preceding month, are covered in our guide to CDT-PD exam dates and testing windows.
What a Miss Costs You
Knowing what failure costs is a practical way to appreciate why precision about the passing requirement matters. If you do not meet the written passing requirement, you must wait at least 30 days before reapplying and pay a new exam fee.
| Item | Amount |
|---|---|
| Specialty written exam fee | $275 |
| Comprehensive exam fee | $275 |
| Practical exam fee | $650 |
| Standard three-exam initial route subtotal | $1,200 |
| Existing CDT adding a specialty (written + practical) | $925 |
These are exam-fee subtotals only. Budget separately for preparation, materials, equipment, applicable shipping, travel, renewal, and retakes. A failed practical is especially expensive, given its $650 fee and the preparation of casts and frameworks in advance. Our complete CDT-PD certification cost breakdown walks through the full budget.
Accommodations affect timing too
If you need testing accommodations, requests require supporting documentation and at least 30 days' advance written notice. Build that lead time into your plan so it does not collide with your application deadline.
Aiming Your Prep at the Score
Since the exact written cutoff comes from NBC and the practical demands every group pass, the smart target is not "just enough." It is a comfortable margin in the heaviest domains and no glaring hole anywhere. Here is one way to order a six-week push around the blueprint, with the reasoning attached.
Domain 2 first
- Largest domain, 25-27%, and it underpins framework thinking in Domains 3 and 4
- Drill surveying, path of insertion, guide planes, rests, and clasp design in both traditional and digital contexts
Domain 8 and Domain 4
- Materials and equipment (18-20%) plus framework manufacture (10-12%) share vocabulary and logic
- Practice "which material or equipment, and why" reasoning
Domains 5, 6, and 7
- Teeth selection and processing, finishing and polishing, and repairs and alterations together cover roughly 29-35% by range
- Repairs and alterations (11-13%) rewards problem-solving, so work through scenarios
Domains 1 and 3, plus gap review
- Master casts (6-8%) and refractory cast (3-5%) are smaller but straightforward points to secure
- Return to your lowest-scoring domain from practice sets
Full-length timed practice
- Simulate 90 questions in 90 minutes with no notes and no scratch paper
- Review every miss for the underlying concept, not just the right letter
Work through realistic CDT partial dentures practice questions under timed, closed-book conditions so the format feels familiar before test day. When you want a fast refresher on must-know facts, keep our CDT-PD cheat sheet nearby.
Technical readiness is part of passing
Remote testing requires a private workspace, a compatible computer with webcam and audio, reliable internet, a smartphone camera, and photo ID. A proctoring problem on exam day can derail a well-prepared candidate, so run your setup check well before your testing window opens.
Frequently Asked Questions
NBC supplies the written passing requirement in the candidate confirmation information it sends you. Because it is provided directly by the certifying body, rely on that document rather than any third-party figure.
The exam administers 90 questions in 1 hour 30 minutes. Of those, 80 are scored and 10 are unscored field-test items. You cannot tell which are which, so treat every question as scored.
No. The practical is independently graded by three examiners, and the four grading groups of preliminary work, design, waxing, and metalwork must all pass in the same administration. Strength in one group does not compensate for a failed group.
You must wait at least 30 days before reapplying and pay a new exam fee, which is $275 for the specialty written. Plan your retake against the monthly written windows and the application deadline on the 20th of the preceding month.
Start with Survey, Design and Preparation for Framework (25-27%) and Selection and Application of Materials and Equipment (18-20%), since they carry the most weight on the blueprint. Then ensure you have no major gaps in Repairs and Alterations (11-13%) and Manufacture Partial Dentures Frameworks (10-12%). For broader context on outcomes, see our look at what the CDT-PD pass-rate data shows.