- How the CDT-I Blueprint Is Built
- Written Exam Format and Question Style
- Domain 1: Preliminary and Diagnostic Work Up
- Domain 2: Manufacture the Master Cast
- Domain 3: Manufacture Removable Prosthesis
- Domain 4: Manufacture Bar/Substructure
- Domain 5: Screw-Retained Fixed or Hybrid Restoration
- Domain 6: Abutment and Cement-Retained Restoration
- Domain 7: Selection and Application of Materials and Equipment
- How the Domains Show Up in the Practical Exam
- Sequencing Your Preparation by Domain
- Registration, Fees and Eligibility in Brief
- Frequently Asked Questions
- The CDT-I blueprint has seven domains; Preliminary and Diagnostic Work Up is largest at 20-22%.
- Screw-retained/hybrid restorations (16-18%) and bars/substructures (15-17%) together make up a third of the blueprint.
- The specialty written exam has 90 administered questions: 80 scored and 10 unscored, in 1 hour 30 minutes.
- NBC publishes percentage ranges, not fixed weights, so study every domain rather than gambling on a few.
How the CDT-I Blueprint Is Built
The Certified Dental Technician credential in the Implants specialty is awarded by the National Board for Certification in Dental Laboratory Technology (NBC). On this site we label it CDT-I. The specialty exam outline, published in the NBC CDT Examination Handbook and Application (March 1, 2026), divides the content into seven domains that follow the lifecycle of an implant case: diagnosis and planning, the master cast, the prosthesis types, the substructures and abutments that connect them, and the materials and equipment behind it all.
NBC publishes each domain as a percentage range rather than a single fixed number. That matters for how you read the blueprint. A range signals that the exact count of questions in a domain can vary from one exam form to another, so treat the figures below as proportional guidance rather than a promise about any individual test.
| Domain | Blueprint Range | Relative Emphasis |
|---|---|---|
| 1. Perform Preliminary and Diagnostic Work Up | 20-22% | Largest domain |
| 2. Manufacture the Master Cast | 10-12% | Mid-size |
| 3. Manufacture Removable Prosthesis | 8-10% | Smallest domain |
| 4. Manufacture Bar/Substructure | 15-17% | Major |
| 5. Manufacture Screw-Retained Fixed or Removable (Hybrid) Restoration | 16-18% | Major |
| 6. Manufacture Abutment and Cement-Retained Restoration | 14-16% | Major |
| 7. Selection and Application of Materials and Equipment | 9-11% | Mid-size |
Notice the shape of the blueprint. Domains 4, 5 and 6 are the three manufacturing pillars for implant restorations, and together they account for roughly 45-51% of the content. Domain 1 sits on top of them as the single biggest block. If you want a deeper look at how hard the exam is relative to your experience, see How Hard Is the CDT-I Exam? Complete Difficulty Guide 2026.
Written Exam Format and Question Style
The specialty written exam is delivered by FastTest as a computer-based test with MonitorEDU remote proctoring. It contains 90 administered questions: 80 scored items and 10 unscored field-test items, and you have 1 hour 30 minutes. You will not know which items are unscored, so answer every question as though it counts.
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. The phrase "single best answer" is the key. Several options may be technically plausible in a laboratory setting; your job is to choose the one that best fits the clinical or technical scenario described.
For the exact score you need, NBC supplies the written passing requirement in candidate confirmation information; see CDT-I Passing Score 2026: Exactly What You Need to Pass for how to find it. To rehearse the format itself, the CDT-I practice tests mirror the four-option, single-best-answer style.
Domain 1: Preliminary and Diagnostic Work Up (20-22%)
This is the largest domain, and it rewards candidates who think like a member of the restorative team rather than only a bench technician. Before any implant prosthesis is fabricated, the laboratory frequently contributes to planning: evaluating records, interpreting the clinician's prescription, and helping translate the planned prosthesis into a surgical and restorative strategy.
Domain 1: Perform Preliminary and Diagnostic Work Up
Expect scenarios about what information a case needs before manufacturing begins and how that information drives design decisions.
- Reviewing and verifying case documentation, prescriptions and impressions or digital records for completeness and accuracy
- Diagnostic casts, mounting and occlusal relationships as they relate to implant-supported prostheses
- Diagnostic wax-ups, tooth setups and how they inform prosthesis design and implant position
- Surgical guides and their relationship to the planned restoration
- Assessing available restorative space and identifying problems before fabrication starts
- Communicating with the clinician when the case information is insufficient or conflicting
Because this domain carries 20-22%, a weak performance here is hard to offset elsewhere. It is also the domain where "best answer" ambiguity is most common, since several actions may be reasonable but only one is the proper first step.
Domain 2: Manufacture the Master Cast (10-12%)
The master cast is the foundation for every downstream step. In implant work it differs from a conventional cast because it must accurately reproduce the implant position and the soft tissue around it, typically through implant analogs and a soft-tissue replica.
Domain 2: Manufacture the Master Cast
Questions focus on accuracy of the transfer from the mouth to the cast and on verifying that accuracy.
- Relating impression technique (for example, how the implant position is captured) to cast fabrication
- Placement and securing of implant analogs in the cast
- Soft-tissue replication and the purpose of a removable gingival component
- Pouring, handling and dimensional behavior of cast materials
- Verification of the cast, including checking that the analog positions match the clinical situation
The practical exam reinforces this domain: candidates prepare advance casts as part of the pre-work. For the full scope of that component, see the practical section below.
Domain 3: Manufacture Removable Prosthesis (8-10%)
This is the smallest domain, but do not skip it. Implant-supported or implant-assisted removable prostheses, including overdentures, introduce retention hardware and design considerations that differ from conventional removable work.
Domain 3: Manufacture Removable Prosthesis
Think about how implants change the design of a removable appliance.
- Overdenture design and the way implant retention changes tissue support and stress distribution
- Attachment systems, their components and how they are incorporated into the prosthesis
- Processing and incorporation of retentive elements into the denture base
- Tooth setup, occlusion and denture base considerations for implant-retained removables
The attachment baseplate in the practical exam ties directly to this domain's retention-hardware knowledge.
Domain 4: Manufacture Bar/Substructure (15-17%)
Bars and substructures provide the framework that connects multiple implants and supports or retains a prosthesis. At 15-17%, this domain is one of the three heavy manufacturing areas, and it is intensely practical: fit, passivity, rigidity and design logic.
Domain 4: Manufacture Bar/Substructure
Know why a bar is designed the way it is, not only how it is made.
- Bar designs and their purposes, including how they provide splinting, retention and support
- Passive fit: what it means, why it matters and how it is verified
- Framework design for hybrid and overdenture prostheses, including clearance for prosthetic teeth and acrylic
- Waxing, casting or milling considerations and the material properties relevant to each approach
- Use of verification tools such as jigs to confirm the fit of the framework to the master cast and to the mouth
Domain 5: Screw-Retained Fixed or Removable (Hybrid) Restoration (16-18%)
This is the second-largest domain. Screw-retained restorations are retrievable, which is their defining advantage, and the hybrid category blends fixed and removable characteristics. Candidates should be fluent in both the design logic and the mechanical details.
Domain 5: Manufacture Screw-Retained Fixed or Removable (Hybrid) Restoration
Questions probe screw access, retrievability, framework-to-prosthesis relationships and material choices.
- Screw access channel position and its effect on esthetics and occlusion
- Retrievability as a design goal and what it implies for the way the restoration is built
- Framework requirements for fixed hybrid prostheses, including support for acrylic or ceramic veneering
- Prosthetic screws and components, torque considerations and fit of the prosthesis to the implants or multiunit abutments
- Relationship between prosthesis design and hygiene access
- Choosing between fixed and removable hybrid designs based on the case
Because Domains 4 and 5 are closely linked, study them together: the framework from Domain 4 is what the restoration in Domain 5 is built upon.
Domain 6: Abutment and Cement-Retained Restoration (14-16%)
Where Domain 5 centers on screw retention, Domain 6 covers abutments and cement-retained restorations. Custom abutments are a major theme here, and the practical exam requires fabricating one during the advance work.
Domain 6: Manufacture Abutment and Cement-Retained Restoration
Know the choices between stock and custom abutments, and how abutment design controls the final restoration.
- Stock versus custom abutments and the situations that favor each
- Abutment design: emergence profile, margin placement, contour and path of insertion
- Material options for abutments and the properties that affect strength and esthetics
- Cement-retained crown and bridge design, including margin location and its effect on cement removal
- Connection geometry and fit between abutment and implant
- Comparing cement-retained and screw-retained solutions for a given scenario
| Consideration | Screw-Retained (Domain 5) | Cement-Retained (Domain 6) |
|---|---|---|
| Retention mechanism | Prosthetic screw through access channel | Cement between restoration and abutment |
| Retrievability | Designed in | Depends on design and cement choice |
| Key design driver | Screw access position | Abutment and margin design |
| Where the exam focuses | Framework and fit | Abutment contour and margins |
Questions often ask you to choose between these approaches given a scenario, so make sure you can articulate the tradeoffs, not just the definitions.
Domain 7: Selection and Application of Materials and Equipment (9-11%)
The final domain is cross-cutting. It tests whether you can choose the right material and the right equipment for the task and use them appropriately. Although it carries 9-11%, material and equipment knowledge also underlies questions in every other domain.
Domain 7: Selection and Application of Materials and Equipment
Think in terms of matching properties to function.
- Metals, ceramics, resins and other restorative materials, with their strengths and limitations for implant work
- Material selection for frameworks, abutments, veneering and denture bases
- Laboratory equipment and its proper use, maintenance and safe operation
- Casting, milling, sintering and processing considerations that affect the final fit
- Infection control and safe handling relevant to laboratory work
Key Takeaway
Domain 7 content shows up inside questions labeled for other domains. When you study a bar, abutment or hybrid restoration, always ask which material fits and why; that single habit covers this domain and strengthens the three manufacturing domains simultaneously.
How the Domains Show Up in the Practical Exam
This site focuses on the specialty written exam, but the practical exam is built from the same domain content, so understanding the connection reinforces your study. The practical is hands-on, with 5 hours 15 minutes of timed work plus advance preliminary work. The advance work includes casts, a custom abutment, an attachment baseplate and a verification jig. The timed portion covers fixed-restoration and bar/substructure work, assessed in three grading groups.
Practical work is independently graded by three examiners, and every required practical subtest must pass in the same administration. Practical testing takes place at a suitable dental laboratory with MonitorEDU or at a scheduled volunteer-host group site. Notice how the pieces map to the domains:
- Advance casts connect to Domain 2 (master cast).
- Custom abutment connects to Domain 6.
- Attachment baseplate connects to Domain 3 (removable prosthesis).
- Verification jig connects to Domains 1, 2 and 4 (diagnostic accuracy and fit verification).
- Fixed-restoration and bar/substructure work connect to Domains 4, 5 and 6.
For the practical fee and how it fits with the written fee, see CDT-I Certification Cost 2026: Complete Pricing Breakdown.
Sequencing Your Preparation by Domain
You do not need a generic study template; you need an order that follows how the domains depend on each other. The case-lifecycle structure of the blueprint suggests a natural sequence, which the timeline below applies. Adjust the pace to your experience, and see CDT-I Study Guide 2026: How to Pass on Your First Attempt for a fuller plan.
Domain 1 and Domain 2: the front end of the case
- Work through diagnostic and planning concepts first, since they carry the most weight
- Cover master cast accuracy and analog placement while the planning logic is fresh
Domain 4 and Domain 5: the framework pair
- Study bars/substructures and screw-retained/hybrid restorations together
- Focus on passive fit, verification and retrievability
Domain 6 and Domain 3: abutments and removables
- Compare cement-retained and screw-retained solutions side by side
- Review attachment systems and overdenture design
Domain 7 and full review
- Consolidate materials and equipment knowledge across all domains
- Take timed 90-question practice sets under closed-book conditions and review misses by domain
Because you cannot use scratch paper on the real exam, practice answering design and verification questions without drawing. A quick reference of core facts is available in the CDT-I Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Registration, Fees and Eligibility in Brief
Knowing the domains is only part of the plan; you also need to be eligible and registered. A brief orientation follows, and the linked articles go deeper.
- Fees: The specialty written exam is $275, the comprehensive exam is $275 and the practical is $650. The standard three-exam initial route subtotals $1,200, and an existing CDT adding a specialty through its written and practical exams subtotals $925. Preparation, materials, equipment, shipping, travel, renewal and retakes are budgeted separately.
- Eligibility: You need a high-school diploma or equivalent, working English, satisfactory ethical and legal standing and an NBC-approved technical pathway. The standard pathway is five years of documented dental-technology education, training and/or experience, with other pathways for CODA program graduates, Recognized Graduates and CE-substitution combinations. Details are in CDT-I Requirements 2026: Eligibility, Prerequisites & How to Qualify.
- Scheduling: 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. See CDT-I Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
- Retakes: Candidates who fail the written exam wait at least 30 days before reapplying and pay a new exam fee. Initial components may be taken in any order but must all be passed within four years of the first pass.
- Renewal: Certification renews annually with 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. Additional specialties do not increase the annual CE requirement.
To pressure-test your knowledge domain by domain, try the CDT-I practice test questions and track which domains cost you the most points.
Frequently Asked Questions
Perform Preliminary and Diagnostic Work Up is the largest at 20-22%. Screw-retained/hybrid restorations follow at 16-18%, then bars/substructures at 15-17% and abutment/cement-retained restorations at 14-16%.
No. NBC publishes percentage ranges, so the number of questions per domain can vary by exam form. Treat the ranges as proportional guidance and prepare for all seven domains.
The specialty written exam has 90 administered questions: 80 scored and 10 unscored field-test items, with 1 hour 30 minutes to finish. Items are four-option, single-best-answer multiple choice, including completion-style stems.
They draw on the same body of knowledge but test it differently. The written exam uses multiple-choice questions across all seven domains, while the practical is hands-on and graded independently by three examiners on tasks such as a custom abutment, an attachment baseplate and bar/substructure work.
NBC supplies the written passing requirement in candidate confirmation information. Our guide on CDT-I pass rate data explains what is and is not publicly available, and the passing score article covers how to find your requirement.