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Key Facts: Iran Dental Specialty Board - Periodontics Exam

100

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

Council for Dental and Specialized Education regulations

120 min

Total duration of the written examination session (60 seconds per question)

Sanjesh Pezeshki exam schedule

70%

Qualifying written passing score (70 out of 100) required to advance to the Daneshnameh practical/oral phase

Ministry of Health and Medical Education specialty bylaws

Negative marking penalty: incorrect answers do not deduct points from correct responses

Sanjesh Pezeshki official board exam instructions

Annual

National administration cadence, traditionally held in late summer (Shahrivar) in Tehran

Sanjesh Pezeshki national specialty calendar

The Iranian Dental Specialty Board in Periodontics is a mandatory 100-question, 100-minute national written milestone examination administered by Sanjesh Pezeshki with no negative marking. Candidates must achieve a 70% cutoff score to advance to the clinical oral/OSCE board examination for the prestigious Daneshnameh specialty credential.

Sample Iran Dental Specialty Board - Periodontics Practice Questions

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

1Which structural feature of the junctional epithelium (JE) is primarily responsible for its elevated permeability and susceptibility to microbial products compared to the oral sulcular epithelium?

A.Wide intercellular spaces with a lower density of desmosomes and lack of stratum corneum

B.Presence of dense tonofilament bundles and extensive tight junction networks

C.Thick stratum spinosum covered by a prominent orthokeratinized surface layer

D.High concentration of hemidesmosomes anchoring the external basal lamina to alveolar bone

Explanation: The junctional epithelium possesses wide intercellular spaces comprising up to 18% of its total volume and contains fewer desmosomal junctions than oral gingival epithelium, along with an absence of keratinization. This specialized ultrastructure allows rapid transmigration of neutrophils and flow of gingival crevicular fluid into the sulcus, while simultaneously permitting bacterial toxins and lipopolysaccharides to penetrate subepithelial connective tissues.

2Which group of principal periodontal ligament fibers constitutes the largest group and is predominantly responsible for resisting vertical and axial masticatory forces?

A.Alveolar crest fibers

B.Oblique fibers

C.Horizontal fibers

D.Apical fibers

Explanation: Oblique fibers represent the most numerous group of periodontal ligament fiber bundles, spanning obliquely from the cementum coronally toward the alveolar bone. Their anatomical angulation efficiently converts vertical, axial masticatory loads into tensile stress distributed along the alveolar socket wall.

3According to Schroeder's classification of root cementum, which cementum type is predominantly found on the coronal two-thirds of the root and plays the principal role in anchoring the tooth via primary extrinsic Sharpey's fibers?

A.Acellular afibrillar cementum (AAC)

B.Cellular intrinsic fiber cementum (CIFC)

C.Acellular extrinsic fiber cementum (AEFC)

D.Cellular mixed stratified cementum (CMSC)

Explanation: Acellular extrinsic fiber cementum (AEFC) forms before tooth eruption on the cervical and middle thirds of the root, consisting almost exclusively of densely packed extrinsic Sharpey's fibers produced by periodontal ligament fibroblasts that provide primary tooth anchorage. It lacks cementocytes within its mineralized matrix and grows slowly through continuous apposition.

4What histological and radiographic structure corresponds to the thin layer of compact bone lining the tooth socket where Sharpey's fibers of the periodontal ligament insert?

A.Cortical plate of the external alveolar process

B.Trabecular cancellous interdental bone

C.Haversian system of the mandibular basal bone

D.Bundle bone, recognized radiographically as the lamina dura

Explanation: Bundle bone lines the inner socket wall and is named for the large bundles of principal periodontal ligament fibers (Sharpey's fibers) embedded within it. Radiographically, because of its dense mineralized collagen alignment and perpendicular orientation to the X-ray beam, it appears as a continuous radiopaque line termed the lamina dura.

5Which of the following statements correctly describes the physiological dynamics and composition of gingival crevicular fluid (GCF)?

A.It transforms from an interstitial transudate in pristine health to an inflammatory exudate with elevated host enzymes as inflammation develops

B.It is actively secreted by acinar cells located in the subgingival connective tissue of the free gingival margin

C.Its flow rate remains completely static regardless of circadian rhythms, mechanical stimulation, or gingival inflammatory status

D.It is primarily composed of salivary mucins and secretory IgA derived from the major salivary duct orifices

Explanation: In clinically healthy, non-inflamed gingival tissue, GCF represents a minimal transudate of blood interstitial fluid flowing along an osmotic gradient. With the initiation of plaque-induced gingivitis and periodontitis, microvascular permeability surges, transforming GCF into an inflammatory exudate enriched with complement factors, cytokines, immunoglobulins, and host-derived proteases such as active MMP-8.

6According to Socransky's microbial complex classification of subgingival plaque, which three bacterial species constitute the pathogenic 'Red Complex' strongly associated with severe periodontal destruction and bleeding on probing?

A.Aggregatibacter actinomycetemcomitans, Campylobacter rectus, and Eikenella corrodens

B.Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia

C.Prevotella intermedia, Fusobacterium nucleatum, and Parvimonas micra

D.Streptococcus gordonii, Actinomyces odontolyticus, and Veillonella parvula

Explanation: Socransky and colleagues identified Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia as the Red Complex. These late-colonizing, obligate anaerobic species are frequently co-isolated from deep periodontal pockets and exhibit the strongest statistical association with active clinical attachment loss and bleeding upon probing.

7Porphyromonas gingivalis expresses cysteine endopeptidases known as gingipains (RgpA, RgpB, and Kgp). What major pathogenic role do gingipains play in disabling host immune defenses?

A.Direct degradation of hydroxyapatite crystals in the presence of acidic metabolic byproducts

B.Selective stimulation of regulatory T-cells to overproduce transforming growth factor-beta

C.Cleavage of complement factors C3 and C5, degradation of host immunoglobulins, and degradation of the IL-8 chemotactic gradient

D.Irreversible cross-linking of collagen triple-helices to prevent phagocytic remodeling

Explanation: Gingipains are cell-surface and secreted cysteine proteases (arginine-specific RgpA/B and lysine-specific Kgp) that degrade host protective proteins, including IgG, IgA, and components of the complement cascade (C3, C5). Furthermore, gingipains degrade interleukin-8 (CXCL8) at high concentrations, inducing 'chemokine paralysis' that impedes directed neutrophil recruitment to infected periodontal tissues.

8The JP2 clone of Aggregatibacter actinomycetemcomitans exhibits exceptionally high virulence in adolescent molar-incisor pattern periodontitis primarily due to which genetic variation?

A.A missense mutation in the fimbrial gene fimA leading to enhanced adhesion to hydroxyapatite

B.A duplication of the capsule locus gene kpsD enabling total evasion of opsonophagocytosis

C.Acquisition of an erythromycin-resistance transposon encoding macrolide efflux pumps

D.A 530-base-pair deletion in the promoter region of the leukotoxin gene operon causing markedly increased leukotoxin production

Explanation: The JP2 clone of A. actinomycetemcomitans possesses a characteristic 530-bp deletion in the promoter region of the ltx operon (comprising ltxCABD). This genomic deletion abolishes regulatory transcriptional inhibition, resulting in up to 10- to 20-fold hyperproduction of leukotoxin (LtxA), which selectively binds beta2-integrin (LFA-1/CD11a/CD18) on human polymorphonuclear leukocytes and monocytes, triggering cytolytic pore formation and rapid periodontal tissue destruction.

9The 'Keystone Pathogen Hypothesis' proposed by Hajishengallis and Darveau explains the role of Porphyromonas gingivalis in periodontitis by proposing which mechanism?

A.It can orchestrate inflammatory disease by transforming a symbiotic microbiota into a dysbiotic community while persisting at relatively low abundance

B.It acts solely as a dominant numerical pathogen that must exceed 70% of total subgingival biofilm biomass to trigger tissue breakdown

C.It directly kills all commensal bacterial species through bacteriocin secretion, leaving a monoculture of strict anaerobes

D.It initiates periodontal destruction only after primary colonization and tissue ulceration by Streptococcus mutans

Explanation: The keystone pathogen hypothesis posits that specific low-abundance microbial pathogens (such as P. gingivalis) can disrupt tissue homeostasis and remodel normally benign commensal microbiota into a dysbiotic, inflammatory state. By manipulating host innate signaling (e.g., crosstalk between C5aR1 and TLR2), P. gingivalis impairs host bactericidal clearance while amplifying inflammation, allowing bystander commensals to proliferate and drive periodontal tissue destruction.

10During the initial host response to dental biofilm, which molecular interaction mediates the firm, stable adhesion of rolling polymorphonuclear neutrophils (PMNs) to the vascular endothelium prior to extravasation?

A.Binding of endothelial E-selectin to sialyl-Lewis X on the neutrophil membrane

B.Interaction between neutrophil beta2-integrins (LFA-1 / Mac-1) and endothelial ICAM-1

C.Cleavage of junctional adhesion molecule-A by neutrophil elastase

D.Ligation of endothelial CD40 by soluble T-cell CD40 ligand

Explanation: Neutrophil recruitment involves a coordinated cascade: initial tethering and rolling are mediated by selectins (P- and E-selectin on endothelium binding sialyl-Lewis X). Chemokine activation (e.g., CXCL8) then triggers a conformational shift in neutrophil beta2-integrins (CD11a/CD18 [LFA-1] and CD11b/CD18 [Mac-1]) to a high-affinity state, enabling firm adhesion through binding to intercellular adhesion molecule-1 (ICAM-1) on endothelial cells.

About the Iran Dental Specialty Board - Periodontics Exam

The Iranian Dental Specialty Board Examination in Periodontics (آزمون دانشنامه تخصصی دندانپزشکی - رشته پریودانتیکس) represents the highest clinical and academic qualification for periodontists in the Islamic Republic of Iran. Administered annually by the National Center for Health Assessment (مرکز سنجش آموزش پزشکی - Sanjesh Pezeshki) under the statutory authority of the Secretariat of the Council for Dental and Specialized Education (دبیرخانه شورای آموزش دندانپزشکی و تخصصی) of the Ministry of Health and Medical Education (MOHME), this rigorous examination certifies that graduating periodontal residents possess advanced clinical competence, biological mastery, surgical dexterity, and scientific judgment. The national examination blueprint is derived from the premier reference textbooks designated by the national curriculum board, primarily Newman and Carranza's Clinical Periodontology and Lindhe's Clinical Periodontology and Implant Dentistry, alongside key consensus reports from the 2017/2018 World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions. The written component features 100 single-best-answer MCQs spanning six foundational domains: Periodontal Biology, Anatomy, Microbiology and Host-Immune Responses (~20%); Periodontal and Peri-Implant Classification, Diagnosis and Prognosis (~20%); Non-Surgical Periodontal Therapy, Antimicrobials and Host Modulation (~15%); Resective, Regenerative and Periodontal Plastic Surgery (~20%); Dental Implantology, Osseointegration, Site Development and Peri-Implant Diseases (~15%); and Systemic Interrelationships, Periodontal Medicine and Maintenance Therapy (~10%). Candidates achieving at least 70% in the written exam advance to the comprehensive clinical OSCE, case defense, and oral examination. This question bank is an independent English-language multiple-choice study adaptation authored by OpenExamPrep. It delivers 100 high-yield practice questions accompanied by in-depth pedagogical explanations and detailed distractor rationales to help periodontal residents, postgraduates, and advanced dental practitioners master core periodontological and implant concepts. The official Iranian specialty board examination is conducted in Persian; this bank is neither an official translation nor a simulation of the official paper, and is not affiliated with or endorsed by Sanjesh Pezeshki or the Ministry of Health and Medical Education.

Exam sponsor: National Center for Health Assessment (Sanjesh Pezeshki) and the Council for Dental and Specialized Education, Ministry of Health and Medical Education. 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 Periodontics (آزمون دانشنامه تخصصی دندانپزشکی در رشته پریودانتیکس) is administered annually in late summer (traditionally Shahrivar) in Tehran under the auspices of the Secretariat of the Council for Dental and Specialized Education and Sanjesh Pezeshki. The certification examination is divided into two sequential phases: 1. Written Examination (آزمون کتبی): Consists of 100 multiple-choice questions (MCQs) with four options per question administered over 100 minutes without negative marking. Examinees must attain a minimum passing score of 70% (70 out of 100) to qualify for the practical/oral phase. Examinees scoring between 60% and 69% obtain the certificate of specialty completion (گواهینامه تخصصی) but cannot proceed to the Daneshnameh (Board) practical phase. 2. Practical and Oral Examination (آزمون شفاهی و عملی / آسکی): Administered over several days following the written phase, featuring Objective Structured Clinical Examinations (OSCE), clinical case presentations, diagnostic radiograph and CBCT evaluations, treatment planning defense before national board examining committees, surgical technique simulations, and critical appraisal of current periodontal and implant literature.

Time Limit

100 minutes

Passing Score

70%

Exam / Certification Fees

Set annually by the Ministry of Health and Medical Education (MOHME), payable online via sanjeshp.ir during official board exam registration

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.

20%

Periodontal Biology, Anatomy, Microbiology & Host-Immune Responses (زیست‌شناسی، آناتومی، میکروبیولوژی و پاسخ‌های ایمنی پریودنتال)

Ultrastructure of gingival epithelium and junctional epithelium, periodontal ligament fibers and cellular components, root cementum types and cementogenesis, alveolar bone remodeling and osteoclast biology, subgingival biofilm architecture and ecological succession (Socransky complexes), virulence factors of key pathogens (Porphyromonas gingivalis, Aggregatibacter actinomycetemcomitans, Treponema denticola, Tannerella forsythia), host immunopathogenesis, neutrophil abnormalities, cytokine networks (IL-1, IL-6, TNF-alpha, RANK/RANKL/OPG axis), and matrix metalloproteinases (MMP-8, MMP-9).

20%

Periodontal & Peri-Implant Classification, Diagnosis & Prognosis (طبقه‌بندی، تشخیص و پیش‌آگهی پریودنتال و پری‌ایمپلنت)

Comprehensive implementation of the 2018 AAP/EFP World Workshop Classification: defining periodontal health, gingivitis (intact vs. reduced periodontium), periodontitis staging (Severity Stage I-IV by CAL, radiographic bone loss, and tooth loss complexity) and grading (Biologic Rate of Progression Grade A-C by indirect/direct evidence, smoking, and diabetes). Diagnostic metrics including clinical attachment level, probing pocket depths, bleeding on probing (BOP), furcation involvement (Glickman/Hamp), tooth mobility, gingival phenotype, Cairo recession classification, peri-implant health, peri-implant mucositis, peri-implantitis, and evidence-based prognostic systems (Kwok & Caton, McGuire).

15%

Non-Surgical Periodontal Therapy, Antimicrobials & Host Modulation (درمان غیرجراحی، ضدمیکروبی‌ها و تعدیل پاسخ میزبان)

Biomechanics and clinical endpoints of manual (Curettes) and power-driven (magnetostrictive/piezoelectric ultrasonic) scaling and root planing, full-mouth disinfection protocols vs. conventional staged debridement, clinical decision-making for systemic antibiotic therapy (amoxicillin + metronidazole synergy), subgingival local drug delivery systems (chlorhexidine gluconate chips, minocycline microspheres, doxycycline hyclate gel), subantimicrobial-dose doxycycline (SDD) for MMP inhibition, laser-assisted debridement, and histological patterns of periodontal healing (long junctional epithelium vs. connective tissue repair).

20%

Resective, Regenerative & Periodontal Plastic Surgery (جراحی‌های حذفی، بازساختی و پلاستیک پریودنتال)

Surgical anatomy of the palate, floor of the mouth, and mental nerve; gingivectomy and gingivoplasty indications; flap designs (modified Widman flap, undisplaced flap, apically positioned flap); osseous resective surgery principles (positive vs. negative architecture, ostectomy vs. osteoplasty); crown lengthening surgery; biological principles of Guided Tissue Regeneration (GTR); resorbable vs. non-resorbable barrier membranes; bone graft biomaterials (autogenous bone, allografts [FDBA/DFDBA], xenografts [bovine/porcine bone mineral], alloplasts [beta-TCP, bioactive glass]); biologics (enamel matrix derivative/Emdogain, recombinant human platelet-derived growth factor/rhPDGF-BB); mucogingival surgery, autogenous soft tissue grafts (connective tissue graft, free gingival graft), coronally advanced flaps, and tunneling techniques for root coverage.

15%

Dental Implantology: Osseointegration, Site Development & Peri-Implant Diseases (ایمپلنت‌های دندانی: استئواینتگریشن، بازسازی موضع و بیماری‌های پری‌ایمپلنت)

Cellular and molecular events of contact vs. distance osseointegration; primary vs. secondary implant stability (resonance frequency analysis/ISQ); macro- and micro-geometry of modern implant fixtures; surgical protocols (immediate type 1, early type 2/3, late type 4 placement); sinus floor elevation techniques (crestal osteotome vs. lateral window antrostomy); guided bone regeneration (GBR) principles (PASS principles: primary closure, angiogenesis, space maintenance, stability); peri-implant soft tissue seal and biological width; diagnostic criteria, risk factors, decontamination protocols, and surgical management of peri-implant mucositis and peri-implantitis.

10%

Systemic Interrelationships, Periodontal Medicine & Maintenance Therapy (روابط سیستمیک، طب پریودنتال و درمان نگهداری)

Two-way mechanistic interrelationship between diabetes mellitus and periodontitis (glycated hemoglobin HbA1c control and periodontal inflammation); associations with atherosclerotic cardiovascular disease, bacteremia, and stroke; pregnancy adverse outcomes (preterm low birth weight); drug-induced gingival enlargement (phenytoin, cyclosporine, nifedipine/amlodipine); hematological disorders and neutrophil immunodeficiencies; supportive periodontal therapy (SPT) recall intervals, periodontal risk assessment (PRA) models, compliance strategies, and management of refractory or recurrent disease.

Preparing for the Iran Dental Specialty Board - Periodontics Exam

What You Need to Know

Passing score: 70%
Assessment: The Iranian Dental Specialty Board Examination in Periodontics (آزمون دانشنامه تخصصی دندانپزشکی در رشته پریودانتیکس) is administered annually in late summer (traditionally Shahrivar) in Tehran under the auspices of the Secretariat of the Council for Dental and Specialized Education and Sanjesh Pezeshki. The certification examination is divided into two sequential phases: 1. Written Examination (آزمون کتبی): Consists of 100 multiple-choice questions (MCQs) with four options per question administered over 100 minutes without negative marking. Examinees must attain a minimum passing score of 70% (70 out of 100) to qualify for the practical/oral phase. Examinees scoring between 60% and 69% obtain the certificate of specialty completion (گواهینامه تخصصی) but cannot proceed to the Daneshnameh (Board) practical phase. 2. Practical and Oral Examination (آزمون شفاهی و عملی / آسکی): Administered over several days following the written phase, featuring Objective Structured Clinical Examinations (OSCE), clinical case presentations, diagnostic radiograph and CBCT evaluations, treatment planning defense before national board examining committees, surgical technique simulations, and critical appraisal of current periodontal and implant literature.
Time limit: 100 minutes
Exam / certification fees: Set annually by the Ministry of Health and Medical Education (MOHME), payable online via sanjeshp.ir during official board exam registration Official sources

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Iran Dental Specialty Board - Periodontics: Suggested Study Strategy

1Master the 2018 AAP/EFP Classification matrix: thoroughly memorize the exact cutoffs for Staging (CAL 1-2 mm for Stage I, 3-4 mm for Stage II, >=5 mm for Stage III/IV; radiographic bone loss <15%, coronal third, mid-third, or apical third) and Grading (% bone loss / age, smoking >=10 cigs/day for Grade C, HbA1c >=7.0% for Grade C).

2Focus heavily on surgical decision-making and regenerative biology: understand the critical differences between infrabony defect morphologies (1-, 2-, and 3-wall defects), biologic indications for GTR vs. Emdogain (EMD) vs. bone grafts, and flap reflection techniques preserving vascularity.

3Review implant biology and site development protocols in Lindhe: be well-versed in the PASS principles of GBR, bone remodeling timelines, differences between crestal osteotome sinus lift and lateral window antrostomy, and definitions of peri-implant health, mucositis, and peri-implantitis.

4Capitalize on the zero-penalty scoring rule: since there is no negative marking on Sanjesh Pezeshki dental board exams, eliminate improbable distractors through biological reasoning and ensure every question is answered on your test sheet.

5Integrate systemic-periodontal linkages: pay close attention to pharmacology (calcium channel blockers, cyclosporine, phenytoin in gingival overgrowth; bisphosphonate-related MRONJ staging) and metabolic interactions (mechanisms linking advanced glycation end-products / AGE-RAGE axis in poorly controlled diabetes to periodontal destruction).

Frequently Asked Questions

What is the structure of the Iranian Dental Specialty Board Examination in Periodontics?

The examination consists of two distinct stages: a written examination comprising 100 four-option multiple-choice questions administered over 100 minutes, followed by an intensive oral and practical examination (OSCE, clinical case presentations, diagnostic radiograph and CBCT interpretation, surgical treatment planning defense, and journal appraisal) for candidates who meet the 70% written threshold.

What is the difference between the Govahinameh (گواهینامه) and the Daneshnameh (دانشنامه / بورد)?

In the Iranian dental postgraduate system, the Govahinameh (Certificate of Specialty Completion) is awarded to residents who score between 60% and 69% on the national written examination, certifying them to practice as specialists. Achieving 70% or higher qualifies the candidate to take the Daneshnameh (Board) practical/oral examination; successful completion of both confers the full Board Certification (Daneshnameh Takhasosi), which is mandatory for academic faculty appointments in dental schools across Iran.

Is there negative marking on the written periodontics specialty board exam?

No. There is no negative marking on the written dental specialty board examination administered by Sanjesh Pezeshki. Candidates receive one full point for each correct answer and zero points for incorrect or unanswered questions, meaning examinees should answer all 100 questions.

What primary reference textbooks are used by Sanjesh Pezeshki for the Periodontics Board?

The official curriculum established by the Secretariat of the Council for Dental and Specialized Education designates Newman and Carranza's Clinical Periodontology and Lindhe's Clinical Periodontology and Implant Dentistry as core references, complemented by official consensus reports and guidelines from the 2017/2018 AAP/EFP World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions.

How does the 2018 AAP/EFP Classification appear on the national specialty exam?

The 2018 classification framework forms a core pillar of the diagnosis and classification section. Examinees are tested on case scenarios requiring precise determination of Periodontitis Stage (I, II, III, or IV based on interdental clinical attachment loss, radiographic bone loss, and tooth loss complexity) and Grade (A, B, or C based on rate of progression, bone loss to age ratio, smoking status, and HbA1c levels in diabetic patients), as well as peri-implant disease definitions.

Is this OpenExamPrep question bank an official Sanjesh Pezeshki examination paper?

No. This question bank is an independent English-language multiple-choice study adaptation authored by OpenExamPrep for conceptual study and board preparation. The official Iranian specialty board examination is administered in Persian by Sanjesh Pezeshki, and this study tool is neither an official translation nor sponsored or endorsed by the Ministry of Health and Medical Education.