Free Practice Questions for Romania Dental Residency Admission — Dental Medicine

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Sample Romania Dental Residency Admission — Dental Medicine Practice Questions

Try these sample questions to review concepts for the Romania Dental Residency Admission — Dental Medicine exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which microorganism associated with cariogenic dental biofilms is acidogenic, tolerates acidic conditions, and synthesizes extracellular glucans from sucrose?

A.Streptococcus mutans

B.Porphyromonas gingivalis

C.Actinomyces israelii

D.Aggregatibacter actinomycetemcomitans

Explanation: Streptococcus mutans produces glucosyltransferases that convert sucrose into extracellular glucans and ferments carbohydrates to acids. These properties favor an acid-tolerant biofilm and mineral loss. Caries is a biofilm-mediated, sugar-driven disease involving a microbial community; S. mutans is not a necessary or sufficient single cause.

2Which approximate critical pH is commonly used as a teaching value for enamel demineralization, recognizing that the actual value depends on calcium and phosphate concentrations in the surrounding fluid?

A.pH 5.5

B.pH 6.8

C.pH 4.2

D.pH 7.4

Explanation: About pH 5.5 is a conventional teaching estimate for enamel. Critical pH is the point at which the surrounding fluid becomes undersaturated with respect to tooth mineral, so it varies with mineral composition and local calcium, phosphate, and fluoride availability. It is not a fixed diagnostic threshold for every patient.

3In the classical histological description of a non-cavitated enamel caries lesion, which zone contains the greatest subsurface mineral loss?

A.Body of the lesion

B.Translucent zone

C.Dark zone

D.Surface zone

Explanation: The body of the lesion contains the greatest mineral loss and increased porosity. The classical description distinguishes it from the advancing translucent zone, the dark zone, and the relatively preserved surface zone. These are histological descriptions rather than measurements obtainable from visual examination alone.

4In G.V. Black's classification of cavity preparations, which class is defined by caries occurring on the proximal surfaces (mesial or distal) of incisors and canines that does NOT involve the incisal angle?

A.Class III

B.Class II

C.Class IV

D.Class V

Explanation: G.V. Black's Class III cavity involves the proximal surfaces of anterior teeth (incisors and canines) without compromising or requiring restoration of the incisal angle. If the lesion extends to involve the incisal angle, it becomes classified as Class IV.

5What is the primary role of 35-37% phosphoric acid etching when applied to enamel prior to composite resin bonding?

A.Selectively dissolves hydroxyapatite prism cores and peripheries, creating microporosities for micromechanical resin tag retention

B.Chemical covalent bonding to calcium in hydroxyapatite crystals

C.Complete denaturation and removal of the dentinal collagen matrix

D.Neutralization of bacterial toxins without modifying surface topography

Explanation: Phosphoric acid selectively dissolves enamel mineral, producing a microscopically rough surface that adhesive resin can infiltrate. Polymerization of the infiltrating resin provides micromechanical retention. Concentration, application time, and subsequent steps should follow the adhesive manufacturer's instructions.

6During dentin bonding with etch-and-rinse adhesive systems, what phenomenon occurs if acid-etched dentin is excessively desaturated with air drying ('over-drying')?

A.Collapse of the exposed demineralized collagen fibril meshwork, preventing adequate primer penetration and leading to poor hybrid layer formation

B.Excessive expansion of the hybrid layer with accelerated bonding strength

C.Precipitation of calcium fluoride crystals within the dentinal tubules

D.Spontaneous polymerization of the adhesive resin without light curing

Explanation: Over-drying of etched dentin removes the water that supports the exposed demineralized collagen scaffold. The unsupported collagen fibers collapse upon each other, forming a dense, impermeable organic mat that blocks the penetration of hydrophilic primer monomers (such as HEMA), resulting in poor resin infiltration, nanoleakage, and reduced bond strength.

7In conventional glass ionomer cements (GIC), what is the fundamental chemical reaction that governs setting and responsible for adhesion to tooth structure?

A.An acid-base reaction between fluoroaluminosilicate glass powder and polyacrylic acid liquid, yielding ionic chelation to tooth calcium

B.Free-radical addition polymerization of dimethacrylate monomers initiated by light

C.Chelation reaction between zinc oxide and eugenol

D.Acid-base reaction between zinc oxide and phosphoric acid

Explanation: Conventional glass ionomer sets by an acid-base reaction between fluoroaluminosilicate glass and aqueous polyalkenoic acid. Released metal ions cross-link the polyacid to form a polycarboxylate salt matrix surrounding residual glass particles with silica-rich surface layers. Carboxylate groups interact with calcium in tooth mineral, contributing to adhesion.

8Which component of dental composite resins acts as the bifunctional coupling agent that binds the inorganic filler particles to the organic dimethacrylate polymer matrix?

A.Organic silane (such as gamma-methacryloxypropyltrimethoxysilane)

B.Bisphenol A-glycidyl methacrylate (Bis-GMA)

C.Triethylene glycol dimethacrylate (TEGDMA)

D.Camphorquinone

Explanation: Silane coupling agents connect silica-based filler surfaces to the resin matrix. Their silanol-containing end interacts with the filler, while methacrylate groups copolymerize with the resin. This interface helps transfer stress, but it remains susceptible to hydrolytic degradation over time.

9An idealized rectangular Class I cavity is 4 mm long, 3 mm wide, and 2 mm deep. Its floor and four vertical walls are bonded; only the occlusal opening is unbonded. If depth increases to 4 mm while length and width remain unchanged, how does the bonded-to-unbonded surface-area ratio change? Ignore bevels and rounded corners.

A.It increases from approximately 3.33 to 5.67

B.It remains 5.0 because there are five bonded walls in both cavities

C.It decreases from approximately 0.30 to 0.18

D.It increases from approximately 2.33 to 4.67

Explanation: At 2 mm depth, bonded area is 4 × 3 + 2(4 × 2) + 2(3 × 2) = 40 mm²; unbonded area is 12 mm², giving 3.33. At 4 mm depth, bonded area becomes 68 mm², giving 5.67. Counting walls would miss the different areas. Shrinkage stress also depends on material properties and placement technique.

10Which operative instrument is specifically designed and used for beveling the gingival cavosurface margin of a proximal box preparation in Class II cavities?

A.Gingival margin trimmer

B.Enamel hatchet

C.Straight chisel

D.Spoon excavator

Explanation: The gingival margin trimmer is a modified dental chisel with a curved blade and an angled cutting edge (mesial and distal varieties, with cutting edges angled at either 80-85 degrees or 95-100 degrees) designed specifically to place a uniform bevel on the gingival cavosurface margin and round the axiopulpal line angle.

About the Romania Dental Residency Admission — Dental Medicine Exam

Independent practice for Concursul Național de Rezidențiat — Medicină Dentară and selected dental subjects. The official Romanian-language admission contest is scheduled for 15 November 2026. This English-language MCQ study adaptation uses four options and one correct answer. It is not an official translation, a full format simulation, or a substitute for the official bibliography, Romanian examination reading, or clinical and practical training.

Exam sponsor: Ministerul Sănătății (Ministry of Health), with six university centers. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

200 questions

Time Limit

240 minutes (4 hours)

Passing Score

60% of the highest national dental score; ranking and available places/posts determine allocation

Exam / Certification Fees

500 lei (2026 session)

Exam sponsor website

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

Official sources

2026 contest publication · Source checked 2026-10-10Ministry publication hosted by UMF Carol Davila: session, registration requirements, and 500 lei fee.
2026 contest methodology · Source checked 2026-10-10Official Gazette methodology: 200 questions, four hours, scoring, eligibility, and ranking.
2026 dental topics and bibliography · Source checked 2026-10-10Seven chapters in Stomatologie, coordinated by Ecaterina Ionescu, Editura Universitară Carol Davila, 2021; no chapter weights published.

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.

18 practice questions

Cariology and odontotherapy

Caries, restorative materials, and adhesion.

18 practice questions

Endodontics

Pulpal diagnosis, instrumentation, irrigation, and obturation.

18 practice questions

Prosthodontics

Preparations, impressions, occlusion, and dentures.

18 practice questions

Oral and maxillofacial surgery

Anesthesia, infections, trauma, cysts, and surgical complications.

14 practice questions

Periodontology

Classification, disease mechanisms, and periodontal care.

14 practice questions

Orthodontics and pediatric dentistry

Development, malocclusion, space maintenance, and pediatric care. These are bank counts, not official examination weights.

Preparing for the Romania Dental Residency Admission — Dental Medicine Exam

What You Need to Know

Passing score: 60% of the highest national dental score; ranking and available places/posts determine allocation
Exam length: 200 questions
Time limit: 240 minutes (4 hours)
Exam / certification fees: 500 lei (2026 session) Official sources

Using Our Practice Resources

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Romania Dental Residency Admission — Dental Medicine: Suggested Study Strategy

1Check the official 2026 publication and bibliography before registering or studying.

2Practice Romanian dental terminology and both official answer-selection formats separately.

3Review the reasoning and limitations of diagnostic signs and treatment rules.

4Use the complete reading list and supervised practical training to address subjects not covered by this bank.

Frequently Asked Questions

What is the official assessment format?

A four-hour Romanian-language written contest with 200 five-option items: 50 with one correct answer and 150 with two to four correct answers. The ordinary admission assessment has no separately graded oral examination, practical test, assignment, or case-study submission.

Does reaching 60% guarantee a residency place?

No. The threshold is 60% of the highest achieved national dental score. Eligible candidates choose within the available places/posts in ranking order.

What should I read alongside this bank?

Use the published 2026 dental bibliography and its specified Stomatologie chapters. The outline does not publish chapter percentages. This bank covers selected subjects and does not replace Romanian textbook reading or clinical and performance practice.