Free Practice Questions for STS Diş Hekimliği

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Sample STS Diş Hekimliği Practice Questions

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

1Maxillary palatal surgery requires anesthesia of the posterior hard palate. Which nerve is the principal target for that soft-tissue territory?

A.Anterior superior alveolar nerve

B.Long buccal nerve

C.Greater palatine nerve

D.Mental nerve

Explanation: The greater palatine nerve supplies much of the posterior hard-palate mucosa and gingiva. Maxillary pulpal anesthesia alone does not establish palatal soft-tissue anesthesia.

2Following a very posterior mandibular anesthetic injection, a patient transiently cannot close the ipsilateral eye. Which explanation best fits this complication?

A.Anesthetic reaching facial nerve branches in the parotid region

B.Selective blockade of the mental nerve

C.Injury isolated to the greater palatine nerve

D.Blockade of the hypoglossal nerve alone

Explanation: An overly posterior injection can enter the parotid region and temporarily affect the facial nerve. Facial motor impairment explains the inability to close the eye and requires appropriate assessment and eye protection.

3Alternating light and dark bands in a ground enamel section change with the direction of illumination. What produces Hunter-Schreger bands?

A.Periodic incremental enamel deposition

B.Alternating mineral concentrations along growth lines

C.Successive layers of secondary dentin

D.Different orientations of adjacent groups of enamel rods

Explanation: Hunter-Schreger bands are an optical effect of changes in enamel-rod orientation. They should be distinguished from incremental growth lines such as the striae of Retzius.

4A tooth detects the direction and magnitude of a light biting force. Which periodontal component most directly contributes this sensory information?

A.Pulpal nociceptors alone

B.Periodontal ligament mechanoreceptors

C.Gingival free nerve endings alone

D.Temporomandibular joint receptors alone

Explanation: Periodontal ligament mechanoreceptors contribute sensory feedback about tooth loading. This feedback helps coordinate biting and protective responses.

5A patient reports dry mouth after starting a strongly antimuscarinic medicine. Which physiological action most directly explains the symptom?

A.Reduced parasympathetic stimulation of salivary secretion

B.Increased secretion from every salivary gland

C.Increased enamel permeability alone

D.Direct destruction of all salivary acini

Explanation: Muscarinic signaling is important in parasympathetic stimulation of salivary secretion. Receptor blockade can reduce secretion without requiring structural destruction of the glands.

6For a simplified salivary buffer, pH = pKa + log10(base/acid). If base and acid concentrations are equal, what is the predicted pH?

A.Twice the pKa

B.One unit above the pKa

C.Equal to the pKa

D.One unit below the pKa

Explanation: Equal concentrations give a base-to-acid ratio of one, whose logarithm is zero. The equation therefore reduces to pH = pKa.

7Loss of mineral from enamel is favored when plaque fluid becomes undersaturated with respect to tooth mineral. Which statement best explains why a single universal critical pH is an approximation?

A.Bulk salivary pH and plaque-fluid pH are always identical

B.Mineral saturation also depends on calcium, phosphate, and fluoride conditions

C.Plaque thickness alone sets a fixed dissolution threshold

D.The threshold is determined solely by the number of exposed surfaces

Explanation: The pH at which mineral dissolution is favored depends on the surrounding fluid's composition. Calcium, phosphate, and fluoride affect the saturation balance, so a fixed pH value simplifies a variable system.

8A sterilizer's external indicator tape changes color. Which conclusion is justified by that observation alone?

A.Every item is proved sterile

B.Biological monitoring is no longer useful

C.The instruments were cleaned adequately

D.The tape was exposed to the conditions it is designed to indicate

Explanation: A chemical indicator shows exposure to specified process conditions. It does not by itself prove cleaning quality, penetration throughout every package, or elimination of all microorganisms.

9Which microbial structure chiefly explains why an ordinary antibacterial drug targeting cell-wall peptidoglycan does not directly treat an oral fungal infection?

A.Fungal walls have an outer lipopolysaccharide layer

B.Fungal walls have especially thick peptidoglycan

C.Fungal cell walls lack bacterial peptidoglycan

D.Fungal walls consist mainly of mycolic acids

Explanation: Fungal walls contain components such as glucans and chitin rather than bacterial peptidoglycan. Treatment must target fungal biology rather than assume that all oral infections respond to antibacterial agents.

10A radiolucency at a nonvital tooth apex is provisionally described as a radicular cyst. Which additional finding would establish that it is a cyst rather than a periapical granuloma?

A.Histologic demonstration of an epithelial-lined cavity

B.A circular outline alone

C.Absence of pain alone

D.A single positive percussion response

Explanation: A cyst is defined by an epithelial-lined cavity. Radiographic and clinical features can suggest a diagnosis, but they do not reliably establish this histologic distinction.

About the STS Diş Hekimliği Exam

Independent practice for dental diploma-equivalence knowledge topics. This is an English-language MCQ study adaptation, not an official translation or Turkish examination simulation, and does not replace clinical or practical preparation.

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

Assessment

One paper knowledge examination in Ankara. The STS paper has no specified oral, practical, assignment, or separate case-study examination; YÖK may separately prescribe clinical practical work within an individual's equivalence process.

Time Limit

150 minutes

Passing Score

40/100 after the wrong-answer deduction

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 dental STS second-period guide, sections 1 and 3 and Table 1 · Source checked 2026-10-21
ÖSYM published 2026 DUS and dental STS assessment materials · Source checked 2026-10-21

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.

12 of 36 study questions

Basic dental sciences

Coverage of all eight listed basic fields. This allocation is our study design, not a published STS weighting.

24 of 36 study questions

Clinical dentistry

Three questions in each listed clinical field. The STS guide does not publish numeric field weights.

Preparing for the STS Diş Hekimliği Exam

What You Need to Know

Passing score: 40/100 after the wrong-answer deduction
Assessment: One paper knowledge examination in Ankara. The STS paper has no specified oral, practical, assignment, or separate case-study examination; YÖK may separately prescribe clinical practical work within an individual's equivalence process.
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
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STS Diş Hekimliği: Suggested Study Strategy

1Read the current STS guide and your individual YÖK decision.

2Review all sixteen listed fields; do not assume that DUS numerical weights are official STS weights.

3Study Turkish clinical terminology and practise clinical skills separately.

Frequently Asked Questions

Must YÖK issue the STS decision before I apply?

The guide allows applicants with a pending equivalence application to enter before referral. A successful result is usable only if YÖK subsequently requires STS.

Does passing complete equivalence automatically?

No. Any prescribed clinical practical requirement and other individual YÖK conditions must also be satisfied.