What is the examination structure for the Thai Dental Council License?

CDA's 2026 academic notice specifies 300 five-option questions in basic sciences, 300 in clinical sciences, and a separate 30-question law paper. The licensing pathway also has clinical work and skills requirements, which candidates must check separately. This four-option study bank does not simulate or replace those assessments.

Who is eligible to take the Thai Dental Licensing Examination?

Candidates must be dental students in their final academic years or graduates holding a Doctor of Dental Surgery (D.D.S. / ท.บ.) degree from a Thai dental faculty accredited by the Dental Council of Thailand, or graduates from an approved foreign dental school whose degree has undergone council equivalency evaluation.

In what language is the official examination administered?

The official Thai National Dental Licensing Examination is administered in Thai, though standard international scientific and clinical terminology is frequently used in English. This OpenExamPrep resource is an independent English-language MCQ study adaptation developed to support clinical reasoning and knowledge revision; it is not an official translation.

What legal requirements govern dental practice in Thailand?

Dental practice is governed by the Dental Profession Act B.E. 2537 (พ.ร.บ. วิชาชีพทันตกรรม พ.ศ. 2537) and regulations issued by the Dental Council of Thailand (ทันตแพทยสภา). Candidates should study the current official legislation and Council rules for licensing, professional conduct, and disciplinary procedures.

What are the passing standards for the written examinations?

Consult CDA's current component-specific assessment regulations. This page does not quote an unverified fixed percentage or standard-setting method.

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Key Facts: Thai Dental Council License Exam

300 + 300

Question counts for basic sciences and clinical sciences respectively

CDA 2026 academic assessment notice

30 questions

Separate professional law paper with a 45-minute timetable window

CDA 2026 academic assessment notice

5,000 THB

March 2026 fee for each science component; law costs 900 THB separately

CDA application notice 2/2569, section 4

B.E. 2537

Governing statute: Dental Profession Act (พ.ร.บ. วิชาชีพทันตกรรม พ.ศ. 2537)

Dental Council of Thailand Legal Compendium

5 options

Official science MCQs require one best answer; local practice uses four options

CDA 2026 academic assessment notice

Independent practice by OpenExamPrep for the Thai Dental Council License (ศ.ป.ท. / CDA): an English-language MCQ study adaptation covering basic and clinical dental sciences, operative dentistry, endodontics, periodontics, prosthodontics, oral and maxillofacial surgery, pediatric dentistry, orthodontics, and Thai dental jurisprudence. This resource is not an official examination translation or simulation of the Thai clinical testing environment.

Sample Thai Dental Council License Practice Questions

Try these sample questions to review concepts for the Thai Dental Council License exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 97+ question experience with AI tutoring.

1A 45-year-old male presents for a routine dental examination. A panoramic radiograph reveals a well-circumscribed, unilocular radiolucency with a sclerotic border surrounding the crown of an impacted mandibular third molar (#32), attaching precisely at the cementoenamel junction. The tooth is asymptomatic and non-tender. What is the most likely diagnosis?

A.Dentigerous cyst (follicular cyst)

B.Radicular cyst (periapical cyst)

C.Odontogenic keratocyst (OKC)

D.Unicystic ameloblastoma

Explanation: A dentigerous (follicular) cyst is an odontogenic developmental cyst that encloses the crown of an unerupted tooth and attaches characteristically to its cementoenamel junction. It originates from fluid accumulation between the reduced enamel epithelium and the formed enamel surface. Treatment consists of enucleation of the cyst together with extraction of the impacted tooth.

2A 52-year-old female presents with bilateral, asymptomatic white lace-like striations and reticular networks on her buccal mucosa. The white lines cannot be wiped off with gauze, and the surrounding mucosa shows no ulceration or erythema. What is the most likely diagnosis?

A.Pseudomembranous candidiasis

B.Leukoplakia

C.Reticular oral lichen planus

D.Pemphigus vulgaris

Explanation: Reticular oral lichen planus presents characteristically as bilateral, symmetrical lace-like white lines known as Wickham striae on the posterior buccal mucosa. It is a chronic T-cell-mediated autoimmune condition and is typically asymptomatic when limited to the reticular form. Because it is non-wipeable and bilateral, clinical appearance is often diagnostic.

3A 38-year-old male presents with painless swelling of the left posterior mandible. Radiographs demonstrate an expansile, multilocular radiolucency with a 'soap-bubble' appearance causing knife-edge root resorption of adjacent molars. Biopsy shows islands of odontogenic epithelium with peripheral columnar cells displaying reversed nuclear polarity and central stellate reticulum-like areas. What is the diagnosis?

A.Odontogenic myxoma

B.Conventional ameloblastoma

C.Calcifying epithelial odontogenic tumor

D.Central giant cell granuloma

Explanation: Conventional solid/multicystic ameloblastoma is a benign but locally aggressive odontogenic epithelial neoplasm most commonly found in the posterior mandible and ramus. Its histopathology characteristically demonstrates follicular or plexiform islands with peripheral palisaded ameloblast-like columnar cells with hyperchromatic, reversed-polarity nuclei and central stellate reticulum. Because of high recurrence rates with simple curettage, resection with 1-cm margins is often required.

4Which principle represents the primary diagnostic advantage of the paralleling technique over the bisecting-angle technique in intraoral periapical radiography?

A.It halves the total radiation exposure required for the patient

B.It requires no beam-alignment holding devices in the oral cavity

C.It allows broader visualization of extraoral cranial structures

D.It minimizes dimensional distortion and accurately depicts alveolar bone levels

Explanation: The paralleling technique places the image receptor parallel to the long axis of the tooth and directs the central X-ray beam perpendicular to both. This satisfies the rules of projection geometry by minimizing dimensional magnification and shape distortion. Consequently, it provides the most accurate and reproducible radiographic assessment of alveolar bone crest heights and root anatomy.

5In digital dental radiography, which technical parameter directly determines the contrast resolution (the number of discrete shades of gray that each pixel can represent)?

A.Spatial resolution (line pairs per millimeter)

B.Bit depth (dynamic range)

C.Focal spot size of the X-ray tube

D.Source-to-object distance

Explanation: Bit depth refers to the number of bits used to define each pixel in a digital image, directly determining the number of gray shades (contrast resolution). For example, an 8-bit image displays 2^8 = 256 gray levels, while a 12-bit image displays 4,096 levels. Higher bit depth allows the digital detector to capture subtle variations in tissue density.

6A 26-year-old male is evaluated for multiple jaw cysts. Radiographic and clinical examination reveals multiple odontogenic keratocysts (OKCs), bifid ribs, calcification of the falx cerebri, palmar pits, and multiple cutaneous basal cell carcinomas. Which hereditary syndrome is diagnosed?

A.Gardner syndrome

B.Peutz-Jeghers syndrome

C.Gorlin-Goltz syndrome (Nevoid basal cell carcinoma syndrome)

D.McCune-Albright syndrome

Explanation: Gorlin-Goltz syndrome (Nevoid basal cell carcinoma syndrome) is an autosomal dominant disorder caused by mutations in the PTCH1 tumor suppressor gene on chromosome 9q. Major clinical criteria include multiple odontogenic keratocysts of the jaws, multiple basal cell carcinomas at an early age, palmar/plantar pitting, calcification of the falx cerebri, and bifid ribs. OKCs in these patients have high recurrence rates and necessitate thorough long-term surveillance.

7A 64-year-old chronic betel quid chewer and cigarette smoker presents with a 2-cm indurated, painless ulcer with elevated, rolled everted margins on the right lateral border of the tongue that has been present for 7 weeks. What is the most appropriate initial diagnostic procedure?

A.Incisional scalpel biopsy including both lesion margin and adjacent normal tissue

B.Immediate wide block resection under general anesthesia with radical neck dissection

C.Topical application of high-potency corticosteroid ointment for a 4-week trial

D.Exfoliative brush cytology without histopathological tissue harvest

Explanation: A chronic, non-healing indurated ulcer with rolled borders in a high-risk patient is highly suspicious for oral squamous cell carcinoma (OSCC). An incisional scalpel biopsy taken at the junction of the active lesion border and clinically normal tissue is the gold standard diagnostic procedure to confirm invasive malignancy before definitive oncologic surgery. Necrotic central areas should be avoided as they may be non-diagnostic.

8On a panoramic radiograph, the anterior teeth appear noticeably narrowed and blurred in their mesiodistal dimension, accompanied by severe overlapping of the premolar contacts and prominent spinal shadow overlap on the lateral margins. What positioning error caused this artifact?

A.The patient's chin was tilted excessively downward

B.The patient was positioned too far back (posterior to the focal trough)

C.The patient's head was rotated to the right side

D.The patient was positioned too far forward (anterior to the focal trough)

Explanation: When a patient is positioned too far forward (anterior to the focal trough), the anterior structures are positioned closer to the image receptor than intended. This geometric projection causes the anterior teeth to appear abnormally narrow, blurred, and out of focus. In addition, the cervical spine is brought into the beam path, creating ghost shadows that obscure the lateral ramus regions.

9Which microscopic feature is uniquely pathognomonic for an Odontogenic Keratocyst (OKC / keratocystic odontogenic tumor)?

A.Thick non-keratinized stratified squamous epithelium with extensive inflammatory exocytosis

B.Uniform parakeratinized stratified squamous epithelium 6 to 8 cells thick with palisaded, polarized basal nuclei ('tombstone' appearance) and a corrugated surface

C.Duct-like tubular structures embedded in eosinophilic amyloid-like stroma with calcified Liesegang rings

D.Abundant proliferating endothelial vascular channels lined by atypical multinucleated pericytes

Explanation: The lining of an odontogenic keratocyst (OKC) exhibits highly characteristic histological features: a uniform thin epithelial lining of 6 to 8 cells without rete ridges, a prominent corrugated parakeratinized surface, and a conspicuous basal layer of palisaded cuboidal or columnar cells with hyperchromatic nuclei arranged in a 'tombstone' or 'picket fence' pattern. The connective tissue wall is thin and often prone to detachment.

10A 32-year-old human immunodeficiency virus (HIV)-positive patient with a low CD4 count presents with multiple asymptomatic, reddish-purple macules and nodules on the hard palate and attached gingiva. Histopathology demonstrates spindle-shaped cell proliferation, slit-like vascular spaces, and extravasated red blood cells. Human herpesvirus 8 (HHV-8) is detected. What is the diagnosis?

A.Pyogenic granuloma

B.Erythroplakia

C.Kaposi sarcoma

D.Bacillary angiomatosis

Explanation: Kaposi sarcoma is an AIDS-defining endothelial vascular neoplasm caused by human herpesvirus 8 (HHV-8 / KSHV). The oral cavity is the initial presentation site in over 20% of HIV-infected patients, most frequently involving the hard palate and gingiva as reddish, purple, or brown macules, plaques, or nodular masses. Microscopic examination demonstrates atypical spindle cells forming slit-like vascular channels with extravasated erythrocytes and hemosiderin pigment.

About the Thai Dental Council License Practice Questions

Check the official exam sponsor for the exam format, time limit, passing standard, fees, and eligibility requirements. These details are not yet confirmed here.