Free Practice Questions for OMSB Dentist

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Sample OMSB Dentist Practice Questions

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1A 28-year-old patient presents with a small occlusal carious lesion on the lower first molar confined to enamel and the outer third of dentin, with no pulpal symptoms. Which restorative material is most appropriate for a conservative, adhesive Class I restoration in this load-bearing posterior tooth?

A.Resin composite placed with an adhesive system

B.Self-cure glass ionomer cement as the definitive restoration

C.Type I cast gold inlay

D.Zinc phosphate cement

Explanation: For a small, conservative Class I cavity in a permanent posterior tooth, a resin composite bonded with an adhesive system is the material of choice because it preserves tooth structure, bonds micromechanically, and withstands occlusal load. It allows a minimally invasive preparation without the macromechanical retention required for amalgam.

2While placing a deep posterior composite restoration, the dentist finds the deepest dentin is close to the pulp but the pulp is asymptomatic with only reversible signs. According to contemporary minimally invasive caries management, what is the preferred approach over the deepest dentin?

A.Complete excavation to hard dentin even if it exposes the pulp

B.Selective (partial) caries removal leaving firm/leathery affected dentin over the pulp

C.Immediate root canal treatment

D.Place amalgam directly over soft carious dentin without any removal

Explanation: Selective caries removal to firm/leathery dentin near the pulp avoids unnecessary pulp exposure while removing infected dentin at the periphery to ensure a sound seal. This preserves pulp vitality and reduces the risk of iatrogenic exposure, consistent with current minimally invasive consensus.

3A Class II composite restoration on a premolar repeatedly shows an open or weak proximal contact after placement. Which technique most directly improves the proximal contact tightness?

A.Using a flat circumferential metal matrix band with no wedge

B.Increasing the curing time only

C.Using a sectional matrix system with a separating ring and wedge

D.Bulk-filling without any matrix

Explanation: A sectional matrix combined with a separating (G-) ring and a wedge creates the anatomic curvature and tooth separation needed to establish a tight proximal contact and proper contour. Flat circumferential bands tend to produce flat, open contacts.

4In the total-etch (etch-and-rinse) adhesive technique on dentin, leaving the dentin desiccated (over-dried) after acid etching most commonly causes which problem?

A.Permanent green discoloration of the composite

B.Excessive bond strength to enamel

C.Immediate pulp necrosis

D.Collapse of the collagen network and post-operative sensitivity from poor hybrid layer formation

Explanation: With etch-and-rinse adhesives on dentin, over-drying collapses the demineralized collagen scaffold, preventing adequate resin infiltration and producing a defective hybrid layer. The result is reduced bond strength, microleakage, and post-operative sensitivity; dentin should be left slightly moist (moist bonding).

5According to G.V. Black's classification, a carious lesion located in the pit and fissure of the occlusal surface of a molar is classified as which class?

A.Class II

B.Class I

C.Class III

D.Class V

Explanation: Class I cavities involve pits and fissures, including occlusal surfaces of posterior teeth, buccal/lingual pits of molars, and lingual pits of anterior teeth. The occlusal pit-and-fissure lesion is the classic Class I location.

6A patient reports sharp pain on biting that disappears immediately when pressure is released, with no spontaneous pain and a normal radiograph. The bite-stick test and transillumination reproduce the pain. What is the most likely diagnosis?

A.Acute apical abscess

B.Irreversible pulpitis

C.Cracked tooth syndrome

D.Chronic apical periodontitis

Explanation: Pain on biting that is sharp and relieved on release, reproduced by a bite stick and transillumination with an otherwise normal radiograph, is the hallmark of cracked tooth syndrome. The crack opens under load, stimulating the pulp, then closes when the load is removed.

7When restoring a Class V cervical erosion/abrasion lesion at the gingival margin where moisture control is difficult and the margin is on root dentin, which material offers the best combination of fluoride release and chemical bonding to dentin?

A.Type IV gold alloy

B.Conventional dental amalgam

C.Feldspathic porcelain

D.Glass ionomer (or resin-modified glass ionomer) cement

Explanation: Glass ionomer and resin-modified glass ionomer chemically bond to dentin, release fluoride, and tolerate moisture, making them well suited to cervical lesions on root surfaces where isolation is challenging. This reduces secondary caries risk at the gingival margin.

8A bonded composite restoration exhibits post-operative sensitivity attributed to polymerization shrinkage stress. Which placement strategy most effectively reduces this stress in a deep cavity?

A.Incremental layering with thin increments, each adequately cured

B.Placing one large bulk increment of conventional composite

C.Curing for only 2 seconds per surface

D.Omitting the bonding agent

Explanation: Incremental layering reduces the unfavorable configuration (C-) factor effect and total shrinkage stress per increment, lowering the risk of gap formation and post-operative sensitivity. Each thin layer is fully cured to limit cumulative contraction stress at the tooth-restoration interface.

9A deep cavity preparation approaches but does not expose the pulp, and the patient has no symptoms of irreversible pulpitis. Which liner is most appropriate to place on the deepest dentin to promote pulp protection and reparative dentin (indirect pulp cap)?

A.A thick layer of 37% phosphoric acid

B.A eugenol-free temporary cement only

C.Calcium hydroxide or a calcium-silicate (MTA-type) material

D.Sodium hypochlorite paste

Explanation: Calcium hydroxide and calcium-silicate cements are biocompatible, alkaline materials that stimulate tertiary (reparative) dentin formation and provide pulpal protection in deep cavities (indirect pulp cap). They help maintain pulp vitality when there is no exposure.

10Which finding on a bitewing radiograph best indicates that a proximal carious lesion has progressed into dentin and generally warrants operative (restorative) intervention rather than remineralization alone?

A.Normal interproximal bone height

B.Radiolucency confined to the outer half of enamel

C.A radiopaque enamel surface with no break

D.Radiolucency extending past the dentino-enamel junction into dentin

Explanation: Radiographic radiolucency extending beyond the dentino-enamel junction into dentin indicates cavitation is likely and the lesion is usually beyond what non-operative remineralization can reliably reverse, supporting restorative treatment. Enamel-only lesions are typically managed non-operatively.

About the OMSB Dentist Exam

The OMSB Licensing Examination for general dentists is a computer-based test of 100 single-best-answer MCQs taken at Prometric centers, lasting 2.5 hours. It assesses clinical competence across the major dental disciplines and, once passed, is followed by a mandatory viva before a license to practice dentistry in Oman is granted.

Exam sponsor: Oman Medical Specialty Board (OMSB). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 single-best-answer MCQs (written theory), delivered as a CBT, followed by a mandatory oral/viva examination for licensure.

Time Limit

2.5 hours (150 minutes) for the written MCQ paper

Passing Score

Commonly cited as 60% (some sources state 65%); OMSB does not publish one universal figure, so confirm directly with OMSB.

Exam / Certification Fees

Approximately USD 220 for the dental exam, plus separate Dataflow verification fees (about OMR 100-110). Verify current pricing with OMSB/Prometric.

Exam sponsor website

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

Official sources

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.

13%

Operative Dentistry

Caries diagnosis and management, cavity classification, direct/indirect restorations, adhesion, and pulp protection.

13%

Oral Medicine and Oral Surgery

Extractions and complications, local anesthesia, oral lesions and cancer, cysts, infections, and emergencies.

13%

Endodontics

Pulpal/periapical diagnosis, canal preparation, irrigation, obturation, vital pulp therapy, apexification, and retreatment.

12%

Prosthodontics

Crowns and bridges, complete/partial dentures, implants, jaw relations, impressions, and occlusion.

12%

Periodontics

Assessment and classification, scaling/root debridement, periodontal surgery, peri-implant disease, and maintenance.

12%

Pediatric Dentistry

Primary tooth pulp therapy, restorations, behavior management, trauma, prevention, and developmental anomalies.

10%

Orthodontics

Malocclusion, crossbites, space analysis, functional appliances, biomechanics, retention, and oral habits.

10%

Special Care Dentistry

Medically compromised, pregnant, geriatric, and special-needs patients, drug interactions, and consent.

Core Competencies

Infection control and sterilization, ethics, Oman licensing context, and basic dental sciences.

Preparing for the OMSB Dentist Exam

What You Need to Know

Passing score: Commonly cited as 60% (some sources state 65%); OMSB does not publish one universal figure, so confirm directly with OMSB.
Assessment: 100 single-best-answer MCQs (written theory), delivered as a CBT, followed by a mandatory oral/viva examination for licensure.
Time limit: 2.5 hours (150 minutes) for the written MCQ paper
Exam / certification fees: Approximately USD 220 for the dental exam, plus separate Dataflow verification fees (about OMR 100-110). Verify current pricing with OMSB/Prometric. Official sources

Using Our Practice Resources

Work through all 100 available questions
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OMSB Dentist: Suggested Study Strategy

1Prioritize the highest-yield disciplines: operative dentistry, oral surgery, and endodontics together make up roughly 39% of the paper, so build a strong base there first.

2Practice single-best-answer clinical scenarios under timed conditions (about 90 seconds per question) to match the 100-question, 2.5-hour Prometric format and build stamina.

3Review Oman-specific licensing context, standard infection-control/sterilization practice, and ethics/consent, and prepare separately for the post-written viva.

Frequently Asked Questions

How many questions are on the OMSB dentist exam and how long is it?

The written theory exam has 100 single-best-answer multiple-choice questions and lasts 2.5 hours (150 minutes), delivered as a computer-based test at a Prometric center.

What is the passing score for the OMSB dental exam?

Most current sources cite a pass mark of around 60% (some state 65%). OMSB does not publish a single universal figure, so candidates should confirm directly with OMSB before sitting the exam.

Is there a viva after the written OMSB dentist exam?

Yes. After passing the written MCQ component, candidates must pass a mandatory oral (viva) examination, typically held at OMSB in Muscat, before a dental license is issued.

How many times can I attempt the OMSB dentist exam?

Candidates may take the exam up to three attempts per calendar year. Credential verification via Dataflow (primary source verification) is also required for licensure.

Free Practice Questions for OMSB Dentist

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