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Key Facts: EHPLE Dental Medicine Exam

200

Exam Questions

MoH HHrIPR-LEO Examination Guideline

Two blocks of 100

Exam Time

MoH Implementation Guideline (blocks of <=120 questions, >=30-minute break)

Angoff

Standard Setting

Modified Angoff criterion-referenced method

29%

Oral & Maxillofacial Surgery share of the blueprint

Official EHPLE Dental Medicine Information Booklet

82.5%

Patient Care domain weight

Official EHPLE Dental Medicine Information Booklet

Not published

Registration Fee

MoH registration portal (hple.moh.gov.et)

The EHPLE Dental Medicine examination is Ethiopia's mandatory national licensing test for dental graduates, delivered as 200 four-option MCQs in a morning and an afternoon block of 100 questions each. The official MoH blueprint weights Patient Care at 82.5% (oral and maxillofacial surgery 29%, endodontics 8%, oral medicine 8%, pediatric dentistry 8%, periodontology 7%, restorative 6%, prosthodontics 5%, orthodontics 5%, interdisciplinary 4.5%, oral radiology 2%), with Leadership and Management 5%, Health Promotion and Disease Prevention 4.5%, Scholar 4%, and Professionalism 4%. The pass mark is set each round by a Modified-Angoff expert panel.

Sample EHPLE Dental Medicine Practice Questions

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

1At what critical pH does dental enamel hydroxyapatite typically begin to undergo net demineralization in the oral cavity?
A.pH 5.5
B.pH 6.8
C.pH 4.5
D.pH 3.5
Explanation: Enamel hydroxyapatite begins net chemical demineralization when the plaque biofilm fluid drops below the critical pH threshold of approximately 5.5. Below this level, oral fluids become undersaturated with respect to hydroxyapatite, driving calcium and phosphate ions out of the crystal lattice. When fluorapatite is incorporated into enamel crystals, the critical pH drops significantly to approximately 4.5, conferring increased acid resistance.
2A patient presents with sharp, localized pain to cold fluids on tooth #30 that lingers for 45 seconds after the thermal stimulus is removed. What pulpal diagnosis is indicated?
A.Normal pulp
B.Reversible pulpitis
C.Symptomatic irreversible pulpitis
D.Pulpal necrosis
Explanation: Symptomatic irreversible pulpitis is clinically defined by prolonged, lingering pain lasting more than 10 to 15 seconds after thermal stimulation has been withdrawn, often accompanied by spontaneous or nocturnal discomfort. The prolonged response indicates that inflamed pulpal C-fibers and microvasculature have sustained irreversible pathological injury and healing is no longer biologically possible without endodontic intervention. In contrast, reversible pulpitis produces sharp, transient discomfort that dissipates within seconds of stimulus removal.
3Which endodontic chemical irrigant is primarily responsible for dissolving and removing the inorganic component of the intracanal smear layer?
A.5.25% Sodium hypochlorite (NaOCl)
B.3% Hydrogen peroxide (H2O2)
C.2% Chlorhexidine gluconate (CHX)
D.17% Ethylenediaminetetraacetic acid (EDTA)
Explanation: 17% EDTA is a polyaminocarboxylic acid chelating agent that binds divalent calcium ions from the hydroxyapatite matrix, effectively demineralizing and dissolving the inorganic debris of the smear layer. Endodontic instrumentation creates a 1- to 2-micron thick smear layer covering dentinal tubule orifices that harbors microbes and prevents sealer penetration. Alternating or following sodium hypochlorite irrigation with 17% EDTA exposes patent dentinal tubules for optimal three-dimensional seal.
4What is the primary biological mechanism by which sodium hypochlorite (NaOCl) dissolves necrotic pulp tissue within root canal systems?
A.Chelation of calcium ions causing cell wall collapse
B.Saponification of fatty acids and neutralization of amino acids into chloramines
C.Coagulation necrosis through mechanical precipitation of cellular proteins
D.Competitive inhibition of bacterial DNA polymerase enzymes
Explanation: Sodium hypochlorite acts as an organic tissue solvent through saponification, where it hydrolyzes fatty acids into soluble soap and glycerol, and neutralizes amino acids to form chloramines and water. These chemical cascades breakdown peptide bonds and degrade proteins, dissolving necrotic pulp remnants and vital tissue alike while exerting powerful broad-spectrum bactericidal activity. This unique tissue-dissolving property makes NaOCl the primary irrigant of choice in modern endodontics.
5According to the Configuration factor (C-factor) concept in restorative dentistry, which cavity preparation exhibits the highest risk of marginal debonding due to polymerization shrinkage stress?
A.Class V facial cervical lesion (C-factor = 1)
B.Class IV incisal angle preparation (C-factor = 0.5)
C.Class II MOD cavity preparation (C-factor = 1.6)
D.Class I occlusal cavity preparation (C-factor = 5)
Explanation: The Configuration factor (C-factor) is defined as the ratio of bonded to unbonded (free) restorative surface areas. A Class I occlusal cavity has five bonded walls (pulpal, buccal, lingual, mesial, distal) and only one free occlusal surface, giving a C-factor of 5:1. Because the unbonded surface is minimal, relief of polymerization shrinkage stress via plastic flow is severely restricted, maximizing tensile stresses at the adhesive interface and increasing the risk of gap formation.
6What is the primary mechanism of true chemical adhesion between conventional glass ionomer cement (GIC) and tooth substrate?
A.Chelation between polyacrylic acid carboxyl groups and hydroxyapatite calcium ions
B.Micromechanical interlocking into resin-hybridized collagen fibrils
C.Covalent bonding between aluminosilicate glass particles and collagen amines
D.Hydrogen bonding between silica fillers and water molecules within dentinal tubules
Explanation: Conventional glass ionomer cements adhere chemically to enamel and dentin through an ionic chelation reaction. Carboxyl groups (-COO⁻) from the polyacrylic acid liquid displace phosphate ions from the tooth mineral phase and form stable ionic bonds with calcium ions residing within the hydroxyapatite crystals. This dynamic ion-exchange interface creates an intimate chemical bond without requiring an intermediate resin adhesive layer.
7In conventional dental amalgam alloys, which metallurgical phase is the weakest, most susceptible to electrochemical corrosion, and eliminated in high-copper amalgams?
A.Gamma phase (Ag3Sn)
B.Gamma-1 phase (Ag2Hg3)
C.Gamma-2 phase (Sn8Hg)
D.Eta phase (Cu6Sn5)
Explanation: The gamma-2 phase (Sn8Hg), formed by the reaction between tin and mercury, is the most corrosion-prone, brittle, and mechanically inferior phase in dental amalgam. High-copper amalgam alloys (containing 12% to 30% copper) eliminate the destructive gamma-2 phase by preferential reaction of copper with tin to form the eta phase (Cu6Sn5), markedly improving marginal integrity, compressive strength, and clinical longevity.
8What is the recommended geometric outline form for the endodontic access cavity of a permanent maxillary first molar?
A.Ovoid outline oriented buccolingually centered on the occlusal groove
B.Triangular or rhomboid outline with the base toward the buccal and apex toward the palatal
C.Circular outline centered exactly over the central fossa
D.Trapezoidal outline with the widest base oriented along the distal marginal ridge
Explanation: The access cavity outline for a maxillary first molar is rhomboid or rounded triangular, with the wide base positioned toward the buccal to accommodate the mesiobuccal (MB1 and MB2) and distobuccal canal orifices, and the apex pointing palatally toward the single large palatal canal orifice. Locating the MB2 canal, which occurs in over 70% to 90% of maxillary first molars, requires extending the access along the mesial boundary between the MB1 and palatal canal orifices.
9What biological landmark is considered the ideal physiological apical termination point for root canal cleaning, shaping, and obturation?
A.Anatomic apex visible on the radiograph
B.Major apical foramen
C.Apical constriction (minor apical diameter)
D.Radiographic apex plus 1.0 mm
Explanation: The apical constriction (minor apical diameter) is the narrowest diameter of the root canal and represents the natural biological boundary between pulpal and periodontal tissues. Preparing and obturating to the apical constriction (typically located 0.5 to 1.5 mm coronal to the radiographic or anatomic apex) preserves periapical tissue architecture, provides an apical resistance form against overfilling, and results in the highest rates of post-treatment apical healing.
10What is the primary antimicrobial mechanism of non-setting calcium hydroxide [Ca(OH)2] when utilized as an interappointment intracanal medicament?
A.Low pH environment inducing cell wall crystallization
B.Chelation of intracellular potassium leading to hyperosmolar bacterial lysis
C.Release of free chlorine radicals that oxidize bacterial lipids
D.High alkaline pH (~12.5) that damages cytoplasmic membranes and denatures bacterial proteins
Explanation: Calcium hydroxide has an intensely alkaline pH of approximately 12.5 to 12.8 due to the continuous dissociation of hydroxyl ions (OH⁻). These free hydroxyl radicals induce severe oxidative stress, denature structural proteins, saponify bacterial membrane lipids, and hydrolyze the lipid A component of bacterial lipopolysaccharides (endotoxins). This sustained alkalinity provides a broad-spectrum antimicrobial action and neutralizes inflammatory osteolytic factors.

About the EHPLE Dental Medicine Exam

The Ethiopian Health Professionals Licensing Examination (EHPLE) for Dentistry is the mandatory national licensure assessment administered by the Federal Ministry of Health (MoH) through the Health and Health-related Institutions and Professionals Regulatory Lead Executive Office (HHrIPR-LEO). It evaluates graduating dental surgeons (DMD/BDS) across comprehensive competencies in conservative dentistry, endodontics, oral and maxillofacial surgery, local anesthesia, periodontology, prosthodontics, pediatric dentistry, orthodontics, oral medicine, oral pathology, and dental radiology required for independent clinical dental practice in Ethiopia.

Exam sponsor: Federal Ministry of Health (MoH) — Health and Health-related Institutions and Professionals Regulatory Lead Executive Office (HHrIPR-LEO). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The MoH Implementation Guideline allots roughly 1.25 minutes per question and caps a single block at 120 questions / 2 hours 30 minutes, followed by a break of at least 30 minutes before the second block. A 200-item sitting is therefore delivered as a morning and an afternoon block of 100 questions each.

Time Limit

Two 100-question blocks with a break of at least 30 minutes

Passing Score

Set each round by an expert panel using the Modified-Angoff method (no fixed percentage)

Exam / Certification Fees

Not published by MoH as a fixed public tariff. A registration fee is paid through the official portal (hple.moh.gov.et); candidates who miss a sitting without an accepted reason pay the registration fee plus a 50% penalty (MoH Exam Administration Manual). Confirm the current amount on the registration announcement.

Exam sponsor website

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

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.

82.5%

Patient Care

Oral and maxillofacial surgery (29%), endodontics (8%), oral medicine (8%), pediatric dentistry (8%), periodontology (7%), restorative dentistry (6%), prosthodontics (5%), orthodontics (5%), interdisciplinary care (4.5%), and oral radiology (2%).

4%

Scholar

Research literacy, evidence-based dentistry, and continuing professional development.

4%

Professionalism

Ethical principles, medico-legal practice, communication, collaboration, and standards of professional conduct.

5%

Leadership and Management

Clinic and team leadership, health system management, and resource stewardship.

4.5%

Health Promotion and Disease Prevention

Community oral health assessment, caries and periodontal disease prevention, and community-based interventions.

Preparing for the EHPLE Dental Medicine Exam

What You Need to Know

  • Passing score: Set each round by an expert panel using the Modified-Angoff method (no fixed percentage)
  • Assessment: The MoH Implementation Guideline allots roughly 1.25 minutes per question and caps a single block at 120 questions / 2 hours 30 minutes, followed by a break of at least 30 minutes before the second block. A 200-item sitting is therefore delivered as a morning and an afternoon block of 100 questions each.
  • Time limit: Two 100-question blocks with a break of at least 30 minutes
  • Exam / certification fees: Not published by MoH as a fixed public tariff. A registration fee is paid through the official portal (hple.moh.gov.et); candidates who miss a sitting without an accepted reason pay the registration fee plus a 50% penalty (MoH Exam Administration Manual). Confirm the current amount on the registration announcement. Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

EHPLE Dental Medicine: Suggested Study Strategy

1Master Endodontic Diagnosis and Irrigation: Understand the precise indications for pulpotomy versus root canal treatment, differentiate symptomatic irreversible pulpitis from apical periodontitis, and memorize the sequence of NaOCl and EDTA irrigation.
2Review Exodontia Mechanics and Fascial Spaces: Be thoroughly familiar with elevator physics (lever, wedge, wheel-and-axle), third molar impaction classifications (Pell & Gregory, Winter), and boundary spaces in Ludwig's angina and canine space infections.
3Memorize 2017 AAP/EFP Periodontal Classification: Practice staging (severity and extent of interdental CAL and bone loss) and grading (rate of progression, smoking, and diabetes risk factors) to accurately classify periodontal clinical cases.
4Understand Prosthodontic Principles: Master Kennedy classification rules, RPD direct and indirect retainer functions, complete denture border molding landmarks (vibrating line, retromolar pad), and fixed prosthodontic finish line designs.
5Practice timed 100-question blocks: the MoH Implementation Guideline allows roughly 1.25 minutes per question, so rehearse at that pace to build endurance across the morning and afternoon blocks and reduce second-guessing.

Frequently Asked Questions

What is the EHPLE Dentistry examination?

The EHPLE Dentistry is the official national professional licensing examination administered by the Ethiopian Federal Ministry of Health (MoH) through HHrIPR-LEO. Passing this examination is required for all graduating dental medicine candidates (DMD/BDS) to obtain clinical registration and legally practice dentistry in Ethiopia.

How is the EHPLE Dentistry examination structured and timed?

The examination consists of 200 single-best-answer multiple-choice questions administered across two separate 100-question blocks on the same test day, allowing a total testing time of Two 100-question blocks (approximately 75 seconds per question).

How is the passing score determined for the dental licensing exam?

The pass mark is determined through the criterion-referenced Modified Angoff standard-setting methodology. A panel of Ethiopian dental educators and clinical specialists reviews each exam item to establish the minimum acceptable competency standard for that specific examination round.

What competency domains are covered on the EHPLE Dental Medicine blueprint?

The official MoH Dental Medicine Information Booklet weights five key professional roles: Patient Care 82.5%, broken down into oral and maxillofacial surgery (29%), endodontics (8%), oral medicine (8%), pediatric dentistry (8%), periodontology (7%), restorative dentistry (6%), prosthodontics (5%), orthodontics (5%), interdisciplinary care (4.5%) and oral radiology (2%); followed by Leadership and Management 5%, Health Promotion and Disease Prevention 4.5%, Scholar 4%, and Professionalism 4%.

How do candidates register for the EHPLE Dentistry exam and what is the fee?

Candidates register online through the official MoH Health Professional Licensure Examination portal at https://hple.moh.gov.et/. The registration fee is a registration fee announced by the Ministry of Health for each round, and applicants must provide proof of graduation or university clearance from an accredited dental program.

Are these practice questions an official EHPLE paper?

No. The EHPLE is set and delivered only by the Federal Ministry of Health; these questions are an independent study aid written against the official Information Booklet blueprint and Ethiopian national clinical guidelines. The official examination is delivered in English as computer-based, four-option, single-best-answer MCQs, so the item format here matches the real assessment, but this bank is not an official past paper, a released item pool, or a simulation of the live testing environment. Always confirm registration dates, fees, and exam-day rules on moh.gov.et/ehple and hple.moh.gov.et.