Free Practice Questions for Iran Dental Board — Prosthodontics

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Exam Review

Key Facts: Iran Dental Board — Prosthodontics Exam

100

Total four-option multiple-choice questions on the written board examination

Council for Dental and Specialized Education regulations

120 min

Total duration of the written examination sitting

Sanjesh Pezeshki exam schedule

70%

Minimum passing score (70/100) required to advance to the clinical/oral practical examination

Secretariat for Dental Specialty Regulations

Negative marking penalty: incorrect answers carry no score deductions

Sanjesh Pezeshki examination rules

Annual

Examination frequency, traditionally conducted in late summer (Shahrivar) in Tehran

National Center for Health Assessment calendar

The Iranian Dental Specialty Board in Prosthodontics is an annual 100-question, 100-minute written examination with no negative marking administered by Sanjesh Pezeshki. Candidates must score at least 70% to advance to the clinical practical and oral defense phase for full board certification.

Sample Iran Dental Board — Prosthodontics Practice Questions

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

1According to Rosenstiel's Contemporary Fixed Prosthodontics, what is the ideal range for total occlusal convergence (taper) in complete crown preparations to achieve adequate retention and resistance form while preventing preparatory undercuts?

A.10 to 20 degrees total convergence (5 to 10 degrees per axial wall)

B.2 to 5 degrees total convergence (1 to 2.5 degrees per axial wall)

C.25 to 35 degrees total convergence (12.5 to 17.5 degrees per axial wall)

D.35 to 45 degrees total convergence (17.5 to 22.5 degrees per axial wall)

Explanation: A total occlusal convergence of 10 to 20 degrees (5 to 10 degrees per wall) represents the clinically achievable ideal that maximizes retention and resistance form while avoiding inadvertent undercuts. Although an extreme taper of 6 degrees was historically cited as theoretically optimal in laboratory models, clinical studies demonstrate that 10 to 20 degrees is the practical standard that preserves pulp vitality and provides adequate frictional retention.

2When preparing a maxillary anterior tooth for a metal-ceramic crown with a porcelain facial margin, which finish line configuration is recommended on the labial aspect to ensure optimal porcelain support and prevent stress concentration?

A.Beveled shoulder finish line with a 45-degree metal collar

B.Knife-edge (feather-edge) finish line

C.90-degree radial shoulder with a rounded internal line angle

D.Chamfer finish line with a 0.3 mm depth

Explanation: A 90-degree radial shoulder with a rounded internal line angle and approximately 1.0 to 1.2 mm depth is the gold standard for an all-porcelain facial margin on a metal-ceramic restoration. The flat shoulder provides a 90-degree butt joint that resists compressive porcelain fracture, while the rounded internal line angle dissipates stress concentration in the porcelain and underlying dentin.

3The supracrestal attached tissues (biologic width) consist of the junctional epithelium and supracrestal connective tissue attachment. What is the classic combined average dimension of this complex described by Gargiulo, and what is the typical periodontal consequence if a crown margin violates it?

A.Approximately 1.0 mm; spontaneous tissue recession without gingival inflammation

B.Approximately 2.04 mm; persistent gingival inflammation, bleeding, and localized alveolar bone loss

C.Approximately 3.5 mm; immediate ankylosis of the periodontal ligament

D.Approximately 0.5 mm; rapid gingival hyperplasia without pocket formation

Explanation: The classic biometric study by Gargiulo et al. established that the biologic width averages 2.04 mm (junctional epithelium ~0.97 mm and supracrestal connective tissue ~1.07 mm). Placing a crown margin within this zone initiates chronic inflammatory cell infiltration, localized pocketing or gingival recession, and crestal bone resorption as the body attempts to re-establish physiological dimensions.

4In porcelain-fused-to-metal (PFM) restorations, which mechanism contributes the largest proportion of bond strength between dental porcelain and the underlying alloy substrate?

A.Mechanical interlocking into microscopic surface irregularities produced by air abrasion

B.Van der Waals electrostatic intermolecular attractions

C.Compressive forces generated by a lower coefficient of thermal expansion in the metal alloy

D.Chemical bonding through a monomolecular oxide layer formed during degassing

Explanation: Chemical bonding between ceramic and metal oxides provides more than half of the total porcelain-metal bond strength. Trace elements in the alloy (such as tin, indium, iron, or gallium) migrate to the surface during degassing to form a coherent monomolecular oxide layer that shares covalent and ionic bonds with the siloxane network of the opaque porcelain.

5Which of the following characteristics is a notable physical property of polyether impression material compared to addition silicone (polyvinyl siloxane)?

A.High dimensional instability caused by the release of volatile ethanol reaction byproducts

B.Inherent hydrophilicity with a low initial contact angle on moist dentin

C.Extreme flexibility with very low tear resistance and modulus of elasticity

D.Extended setting time exceeding 15 minutes with permanent plastic deformation upon removal

Explanation: Polyether is inherently hydrophilic due to its ether and carbonyl groups, allowing it to wet tooth structure and capture fine margin details even in the presence of trace residual moisture without requiring topical surfactants. In contrast, unmodified addition silicones are hydrophobic and depend on incorporated nonionic surfactants to achieve favorable wetting.

6A clinician is evaluating provisional restorative materials for a multi-unit full-arch fixed prosthesis. Which resin material exhibits the highest volumetric polymerization shrinkage and greatest exothermic temperature increase during setting?

A.Polyethyl methacrylate (PEMA)

B.Bis-acryl composite resin

C.Urethane dimethacrylate (UDMA) light-cured resin

D.Polymethyl methacrylate (PMMA)

Explanation: Polymethyl methacrylate (PMMA) demonstrates significant volumetric shrinkage (approximately 6% to 8%) and generates substantial exothermic heat during its free-radical addition polymerization. When fabricating direct provisional restorations with PMMA, clinicians must remove the provisional before final polymerization or use copious water cooling to avoid irreversible thermal damage to the dental pulp.

7What is the recommended surface conditioning protocol to achieve optimal micromechanical retention and chemical adhesion to a lithium disilicate glass-ceramic restoration before resin cementation?

A.Etching with ~5% hydrofluoric acid for 20 seconds, followed by silane coupling agent application

B.Airborne particle abrasion with 50 µm aluminum oxide at 4 bar, followed by 37% phosphoric acid for 60 seconds

C.Etching with 37% phosphoric acid for 15 seconds, followed by 10-MDP primer application without silane

D.Etching with 9% hydrofluoric acid for 5 minutes, followed by immediate application of unfilled bonding resin

Explanation: Lithium disilicate restorations require etching with 4.5% to 5% hydrofluoric acid for 20 seconds to selectively dissolve the glassy matrix and expose the lithium disilicate crystal network. Subsequent application of a silane coupling agent promotes covalent bonding between the exposed silica and the methacrylate groups of the resin luting agent.

8Which surface treatment protocol is recognized as essential for achieving durable resin bonding to monolithic 3Y-TZP polycrystalline zirconia crowns?

A.Etching with 9.5% hydrofluoric acid for 60 seconds followed by universal silane application

B.Acid etching with 37% phosphoric acid for 2 minutes followed by unfilled resin bonding agent

C.Airborne particle abrasion with 50 µm alumina at 1.5 to 2.5 bar, followed by a 10-MDP-containing primer

D.Polishing with diamond paste followed by immersion in 70% isopropyl alcohol with no chemical priming

Explanation: Polycrystalline zirconia lacks an amorphous glass phase and cannot be etched with hydrofluoric acid. Reliable resin bonding requires airborne-particle abrasion (50 µm alumina at moderate pressure of 1.5-2.5 bar) to clean the surface and create micromechanical roughness, followed by application of a primer containing 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP), which bonds chemically to zirconium oxide.

9What is the primary mechanism by which resin-modified glass ionomer (RMGI) luting cements achieve adhesion to natural tooth structure?

A.Micromechanical retention exclusively through deep penetration into open dentinal tubules without chemical bonding

B.Covalent cross-linking between polyacrylic acid polymer chains and collagen amino acids

C.Ionic chelation between carboxylate groups of polyalkenoic acid and calcium ions in hydroxyapatite

D.Electrochemical zinc oxide oxidation bonding directly to the inorganic enamel prism matrix

Explanation: Resin-modified glass ionomers retain the fundamental acid-base reaction of conventional glass ionomers: carboxylate groups (-COO-) on the polyalkenoic acid chains form ionic chelation bonds with calcium ions in hydroxyapatite. In addition, polymerizable methacrylate groups create a cross-linked polymer network that provides enhanced early mechanical strength and resistance to moisture.

10What is the minimum recommended height of sound, parallel vertical dentin required coronal to the finish line to establish an effective 'ferrule effect' when restoring an endodontically treated tooth with a post and core?

A.1.5 to 2.0 mm with at least 1.0 mm of axial wall thickness

B.0.5 mm with at least 0.3 mm of axial wall thickness

C.3.5 to 4.5 mm with at least 2.5 mm of axial wall thickness

D.No vertical dentin is required provided a high-strength composite core is adhesively bonded

Explanation: A ferrule is a 360-degree collar of sound dentin extending 1.5 to 2.0 mm coronal to the preparation margin with an axial wall thickness of at least 1.0 mm. Clinical and biomechanical studies confirm that an adequate ferrule significantly improves resistance to masticatory forces and prevents catastrophic root fractures by redistributing lateral stresses.

About the Iran Dental Board — Prosthodontics Exam

The Iran Dental Specialty Board Examination in Prosthodontics (آزمون دانشنامه تخصصی دندانپزشکی - پروتزهای دندانی) represents the highest academic and clinical certification for dental prosthodontists in the Islamic Republic of Iran. Administered annually by the National Center for Health Assessment (Sanjesh Pezeshki) under the statutory authority of the Ministry of Health and Medical Education (MOHME), the examination certifies specialists upon completion of their rigorous three- to four-year prosthodontic residency program. The certification process comprises two mandatory phases: the written multiple-choice examination (Katbi) and the practical/clinical examination (Amali / Shafahi). The written examination consists of 100 multiple-choice questions administered over a single 100-minute session without negative marking. The questions are based on national core reference curricula, prominently including Rosenstiel's Contemporary Fixed Prosthodontics, McCracken's Removable Partial Prosthodontics, Boucher's Prosthodontic Treatment for Edentulous Patients (Zarb & Hobkirk), and authoritative clinical literature on dental implantology, occlusion, and maxillofacial prosthetics. A passing mark of at least 70% (70/100) is mandatory to advance to the clinical stage, which tests treatment planning, laboratory skill, and defended case presentations. This practice bank is an independent English-language multiple-choice study adaptation authored by OpenExamPrep. It provides 100 comprehensive practice questions with in-depth pedagogical explanations and distractor rationales to help dental residents and prosthodontists master essential principles of rehabilitation. The official examination is administered in Persian by Sanjesh Pezeshki; this question bank is not an official examination booklet and is not affiliated with or endorsed by Sanjesh Pezeshki.

Exam sponsor: Council for Dental and Specialized Education & Sanjesh Pezeshki (مرکز سنجش آموزش پزشکی و دبیرخانه شورای آموزش دندانپزشکی و تخصصی). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The Iranian Dental Specialty Board Examination in Prosthodontics is held annually (traditionally in late summer / Shahrivar) in Tehran under the supervision of the Council for Dental and Specialized Education and Sanjesh Pezeshki. The board qualification consists of two successive stages: a 100-question written examination (100 minutes, four choices per question, no negative marking) and a multi-station clinical practical examination (including objective structured clinical examinations [OSCE], laboratory procedures, and clinical case portfolio presentation and defense). Candidates who achieve 70% or higher on the written stage advance to the practical stage. Successfully completing both phases awards the National Specialty Board Certificate (Daneshnameh Takhasosi), qualifying specialists for university faculty appointments and specialized hospital practice.

Time Limit

100 minutes

Passing Score

70%

Exam / Certification Fees

Nominal fee set annually by the Ministry of Health and Medical Education, payable online through sanjeshp.ir

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.

25%

Fixed Prosthodontics

Principles of tooth preparation (retention, resistance, taper, structural durability), biologic width and finish line designs (chamfer, shoulder, knife-edge), elastomeric impression materials and soft tissue management, provisional restorations, metal-ceramic alloys and bond mechanisms, all-ceramic systems (lithium disilicate, zirconia), and luting cements (resin-modified glass ionomer, adhesive resin cements).

20%

Removable Partial Dentures

Kennedy classification and Applegate's rules, biomechanical principles of Class I through IV arches, major and minor connector design criteria, rest seats and occlusal/cingulum rest preparations, direct retainers (clasp assemblies, RPI, RPA, wrought wire), indirect retention, surveyor analysis (guiding planes, path of insertion), and altered cast impression techniques for distal extension bases.

20%

Complete Dentures & Occlusal Relationships

Anatomy of denture-bearing areas and limiting structures (retromolar pad, vibrating line, hamular notch, genial tubercles), preliminary and border-molded definitive impressions, vertical dimension of rest and occlusion (VDR and VDO), centric relation records (Gysi gothic arch, wax records), balanced bilateral articulation, lingualized occlusion, and post-insertion complaints (sore spots, speech alterations, unstable bases).

20%

Implant Prosthodontics

Prosthetic-driven implant treatment planning, Misch bone density classification (D1-D4), biomechanics of implant-supported restorations, abutment selection (prefabricated, customized titanium, zirconia), screw-retained versus cement-retained crowns, platform switching and crestal bone preservation, implant-supported overdentures (locator, ball, bar-clip), and full-arch fixed implant restorations (All-on-4, milled titanium/zirconia frameworks).

15%

Maxillofacial Prosthetics, Occlusion, TMD & Esthetics

Maxillectomy defect classification (Aramany), surgical, interim, and definitive obturator prostheses, extraoral craniofacial prosthetics (orbital, auricular, nasal), condylar guidance and semi-adjustable articulators, temporomandibular joint disorders and occlusal splints (stabilization vs anterior repositioning appliances), and dental esthetic principles (smile arc, dental midline, buccal corridors, proportion).

Preparing for the Iran Dental Board — Prosthodontics Exam

What You Need to Know

Passing score: 70%
Assessment: The Iranian Dental Specialty Board Examination in Prosthodontics is held annually (traditionally in late summer / Shahrivar) in Tehran under the supervision of the Council for Dental and Specialized Education and Sanjesh Pezeshki. The board qualification consists of two successive stages: a 100-question written examination (100 minutes, four choices per question, no negative marking) and a multi-station clinical practical examination (including objective structured clinical examinations [OSCE], laboratory procedures, and clinical case portfolio presentation and defense). Candidates who achieve 70% or higher on the written stage advance to the practical stage. Successfully completing both phases awards the National Specialty Board Certificate (Daneshnameh Takhasosi), qualifying specialists for university faculty appointments and specialized hospital practice.
Time limit: 100 minutes
Exam / certification fees: Nominal fee set annually by the Ministry of Health and Medical Education, payable online through sanjeshp.ir Official sources

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Iran Dental Board — Prosthodontics: Suggested Study Strategy

1Master Fixed Prosthodontics fundamentals: ensure solid recall of preparation geometry (total occlusal convergence of 10-20 degrees, minimal 0.4 mm chamfer for cast metal, 1.0-1.5 mm shoulder or heavy chamfer for ceramics) and finish line placements relative to the junctional epithelium.

2Thoroughly analyze McCracken's RPD clasp mechanics: understand the rotational axis of Class I and II distal extension prostheses, why RPI systems disengage during functional loading, and how indirect retainers must be placed perpendicular to the fulcrum line at the greatest possible distance.

3Know Boucher's complete denture landmarks cold: memorize which anatomic structures limit borders (e.g., masseter notch, pterygomandibular raphe, genioglossus) versus which act as primary stress-bearing areas (buccal shelf in mandible, horizontal hard palate in maxilla).

4Focus on implant biomechanics and abutment protocols: review the indications for screw-retained vs cement-retained prostheses, the biologic rationale for platform switching, and optimal implant distribution for full-arch fixed versus overdenture restorations.

5Review Aramany classifications for maxillectomy defects and obturator design: recognize the biomechanics of Class I (midline resection) through Class VI (bilateral anterior resection) defect restorations.

Frequently Asked Questions

What is the structure of the Iran Dental Specialty Board Examination in Prosthodontics?

The examination is divided into two sequential stages: a written theory test (Daneshnameh Katbi) consisting of 100 multiple-choice questions administered over 100 minutes, followed by a clinical practical examination (Daneshnameh Amali) for candidates who achieve a minimum score of 70% on the written phase. The practical phase incorporates OSCE stations, simulated laboratory procedures, and oral defense of completed residency clinical cases.

Is there negative marking on the Iranian Prosthodontics Board written exam?

No. The written board examination administered by Sanjesh Pezeshki does not have negative marking. Candidates receive 1 mark for each correct answer and 0 for incorrect or unanswered questions. It is advantageous to answer every question on the test.

What is the passing score for the written board examination?

Candidates must achieve at least 70% (70 correct answers out of 100 questions) on the written examination to be admitted to the practical, clinical, and oral defense examinations.

What are the primary reference textbooks for the examination?

The official core syllabus set by the Council for Dental and Specialized Education references standard international textbooks, primarily Rosenstiel's Contemporary Fixed Prosthodontics, McCracken's Removable Partial Prosthodontics, Boucher's Prosthodontic Treatment for Edentulous Patients (Zarb & Hobkirk), Misch's Contemporary Implant Dentistry, and Okeson's Management of Temporomandibular Disorders and Occlusion.

Who is eligible to participate in the Iranian Prosthodontics Specialty Board Examination?

Eligible candidates are post-graduate dental residents who have successfully completed an accredited three- to four-year Prosthodontics residency program at an Iranian medical university (or an evaluated and accredited equivalent foreign degree) and have passed the internal pre-board written and clinical exit exams.

How does OpenExamPrep's question bank correspond to the official examination?

This question bank is an independent English-language MCQ study adaptation developed by OpenExamPrep for conceptual review and mastery of prosthodontic principles. The official Sanjesh Pezeshki examination is administered in Persian. This resource is not an official test paper and is not affiliated with or endorsed by Sanjesh Pezeshki.