Free Practice Questions for DUS

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Sample DUS Practice Questions

Try these sample questions to review concepts for the DUS exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 36+ question experience with AI tutoring.

1A mandibular block numbs the lower lip, but instrumentation of buccal gingiva beside a lower molar remains painful. Which additional nerve territory explains the residual sensation?

A.Lingual nerve

B.Long buccal nerve

C.Mental nerve

D.Nasopalatine nerve

Explanation: The long buccal nerve supplies buccal gingiva beside the mandibular molars. Lower-lip numbness confirms anesthesia in mental nerve territory, rather than every mandibular soft-tissue territory.

2A mandibular fracture produces chin and lower-lip numbness with preserved tongue sensation. Which structure should be assessed along the mandibular canal?

A.Facial nerve

B.Hypoglossal nerve

C.Glossopharyngeal nerve

D.Inferior alveolar nerve

Explanation: The inferior alveolar nerve traverses the mandibular canal and gives rise to the mental nerve. Its involvement can therefore explain chin and lower-lip sensory loss.

3A developing root is surrounded by a bilayer derived from inner and outer enamel epithelia. Which structure is described?

A.Hertwig's epithelial root sheath

B.Dental follicle

C.Dental papilla

D.Stellate reticulum

Explanation: Hertwig's epithelial root sheath extends from the cervical loop and helps determine root form. It induces adjacent papilla cells to differentiate into root odontoblasts.

4A patient develops new cervical caries after marked salivary hypofunction. Which lost function most directly reduces protection after dietary acid challenges?

A.Lubrication by salivary mucins

B.Enzymatic digestion of starch

C.Acid buffering and delivery of remineralizing ions

D.Dissolution of substances for taste

Explanation: Saliva buffers acid and supplies calcium and phosphate for remineralization. Reduced flow also impairs clearance and can prolong acidic conditions.

5A cold stimulus causes brief sharp pain in exposed cervical dentin. Which mechanism best explains this response?

A.Fluid movement in dentinal tubules

B.Sustained inflammatory pulpal vasodilation

C.Inflammation of the apical periodontal ligament

D.New tertiary dentin deposition during cooling

Explanation: The hydrodynamic explanation links dentin sensitivity to stimulus-induced movement of tubular fluid. This movement activates pulpal sensory nerve endings.

6Vitamin C deficiency causes gingival bleeding and impaired wound repair. Which biochemical defect best links these findings?

A.Failure of DNA base pairing

B.Loss of salivary amylase

C.Failure of heme synthesis alone

D.Impaired hydroxylation of collagen proline and lysine

Explanation: Vitamin C supports prolyl and lysyl hydroxylases involved in collagen maturation. Defective connective-tissue integrity contributes to capillary fragility and poor healing.

7A plaque sample acidifies after glucose exposure. Which bacterial process directly accounts for this change?

A.Urea hydrolysis

B.Carbohydrate fermentation

C.Proteolysis of salivary proteins

D.Oxidative deamination of amino acids

Explanation: Cariogenic organisms metabolize fermentable carbohydrate to organic acids. Repeated acidification can shift the mineral balance toward demineralization.

8Two plaque samples contain equal organism counts, but only one repeatedly maintains a low pH after sugar exposure. Why can it remain cariogenic without one dominant species?

A.Total organism count alone determines caries

B.All plaque organisms have identical acid tolerance

C.Community acid production and acid tolerance sustain the environment

D.Any commensal organism excludes a cariogenic community

Explanation: Caries reflects biofilm ecology and function rather than a single count or species. Repeated acidity favors acid-producing and acid-tolerant organisms and tooth mineral loss.

9A cleaned reusable dental instrument still requires sterilization. Which endpoint distinguishes sterilization from routine disinfection?

A.Removal of visible organic soil

B.Reduction of viable organisms to a specified acceptable level

C.Destruction of vegetative organisms with possible spore survival

D.Elimination of viable microorganisms including bacterial spores

Explanation: Sterilization is intended to eliminate viable microorganisms, including bacterial spores. Cleaning removes soil but does not itself establish sterility.

10A persistent lateral-tongue ulcer has indurated margins and no clear traumatic cause. Which response best addresses the possibility of malignancy?

A.Prompt diagnostic assessment with biopsy or specialist referral

B.Repeated empirical antibiotics without reassessment

C.Reassurance based only on absence of pain

D.Definitive diagnosis from surface color alone

Explanation: A persistent unexplained indurated ulcer requires tissue diagnosis or prompt referral for it. Painless presentation and visual appearance cannot reliably exclude oral carcinoma.

About the DUS Exam

Independent practice for DUS basic and clinical dental science topics. This is an English-language MCQ study adaptation, not an official translation, Turkish-language rehearsal, or format simulation. It does not substitute for clinical or performance training.

Exam sponsor: ÖSYM. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

One on-site paper session: 40 basic and 80 clinical dental science MCQs. No oral, practical, assignment, or separately assessed case-study component is specified for the entrance examination. Subsequent specialty training has separate requirements.

Time Limit

150 minutes

Passing Score

45 weighted points for preferences; not a guaranteed placement score

Exam / Certification Fees

TRY 2,500 standard 2026 fee; late applications cost 50% more

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

ÖSYM 2026 DUS second-period application guide, including Table 1 · Source checked 2026-10-21
ÖSYM 2026 first-period DUS and dental STS published question materials · Source checked 2026-10-21Official Turkish assessment materials; our questions are independently written.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

One third of this study bank

Basic dental sciences

12 questions sampling all eight listed basic-science fields.

Two thirds of this study bank

Clinical dental sciences

Three questions in each of the eight clinical fields. This inventory is a study sample rather than exhaustive specialty preparation.

Preparing for the DUS Exam

What You Need to Know

Passing score: 45 weighted points for preferences; not a guaranteed placement score
Assessment: One on-site paper session: 40 basic and 80 clinical dental science MCQs. No oral, practical, assignment, or separately assessed case-study component is specified for the entrance examination. Subsequent specialty training has separate requirements.
Time limit: 150 minutes
Exam / certification fees: TRY 2,500 standard 2026 fee; late applications cost 50% more Official sources

Using Our Practice Resources

Work through all 36 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

DUS: Suggested Study Strategy

1Use the current ÖSYM guide for eligibility, scoring, and dates.

2Study each basic field and all eight clinical fields beyond this small inventory.

3Practice Turkish terminology and seek appropriate supervised clinical training separately.

Frequently Asked Questions

Does 45 points guarantee a specialty place?

No. It is the minimum preference threshold; score ranking, quotas, language qualification, and other eligibility conditions govern placement.

Are these official or translated ÖSYM questions?

No. These are independently written English-language study questions with four choices. The official DUS uses Turkish five-choice items.