Free Practice Questions for UKDGI

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card

92+ Questions

100% Free

Loading practice questions...

Exam Review

Key Facts: UKDGI Exam

KDGI / KKI

Official administering professional body

kdgi.or.id

SKDGI

National competence framework standard

Standar Kompetensi Dokter Gigi Indonesia

Lifetime

STR validity under UU No. 17 Tahun 2023

UU No. 17 Tahun 2023 tentang Kesehatan

Theory + OSCE

Official assessment components

kolegium.doktergigi.org

UKDGI tests knowledge and clinical skills across restorative dentistry, oral surgery, prosthodontics, periodontics, and pediatric dentistry. This is an independent 92-question English-language MCQ practice bank by OpenExamPrep.

Sample UKDGI Practice Questions

Try these sample questions to review concepts for the UKDGI exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 92+ question experience with AI tutoring.

1A 23-year-old female presents to the dental clinic for restoration of a non-stress-bearing cervical carious lesion on tooth 24. The dentist selects conventional glass ionomer cement (GIC) over composite resin. What is the primary mechanism by which conventional glass ionomer cement adheres to tooth enamel and dentin?

A.Chemical chelation between the carboxyl groups of polyacrylic acid and calcium ions in hydroxyapatite

B.Micromechanical interlocking within microscopic resin tags created by 37% phosphoric acid etching

C.Covalent bonding between silane coupling agents and organic collagen fibril networks

D.Physical adhesion achieved strictly through surface tension and capillary action in dentinal tubules

Explanation: Conventional glass ionomer cement (GIC) adheres chemically to tooth mineral (enamel and dentin) through an ionic chelation mechanism. The ionized carboxyl groups (-COO⁻) of the polyacrylic acid polymer react directly with calcium ions (Ca²⁺) present within the hydroxyapatite crystalline matrix, creating a durable chemical bond alongside sustained fluoride release.

2A dentist is preparing a Black Class II mesio-occlusal cavity preparation for an amalgam restoration on tooth 36. What is the recommended width of the occlusal isthmus to preserve remaining tooth structure while providing adequate bulk for the restorative material?

A.One-fourth to one-third of the intercuspal distance

B.Two-thirds to three-fourths of the intercuspal distance

C.Greater than half of the total buccolingual tooth width

D.Equal to the full width of the central developmental groove only

Explanation: According to GV Black's cavity preparation principles and contemporary conservative concepts, the ideal occlusal isthmus width for an amalgam restoration is approximately one-fourth to one-third of the intercuspal distance. Narrower isthmuses increase the risk of amalgam fracture, while wider preparations (>1/3) significantly weaken the remaining cusps, increasing the risk of subsequent tooth fracture.

3During a restorative procedure on a deep dentin cavity of tooth 45, the dentist chooses a two-step self-etch adhesive system (6th generation) instead of a total-etch (etch-and-rinse) system. What is the major biological advantage of using a self-etch adhesive in deep dentin preparations?

A.Simultaneous demineralization and monomer infiltration prevents deep naked collagen collapse and reduces postoperative sensitivity

B.Complete removal of the dentin smear layer and opening of all dentinal tubule orifices to the pulp chamber

C.Complete elimination of bacterial endotoxins through strong 37% phosphoric acid etching

D.Formation of an impermeable 1-millimeter-thick hybrid zone that guarantees zero pulpal inflammation

Explanation: Self-etch adhesive systems utilize acidic functional monomers that demineralize dentin and infiltrate it simultaneously to the exact same depth. Because the demineralization front is never deeper than monomer penetration, there is no unsupported 'naked' collagen zone at the base of the hybrid layer, significantly lowering the risk of postoperative hydraulic fluid movement and dentin hypersensitivity.

4A 19-year-old male was struck in the mouth during a sports match 3 hours ago. Clinical examination shows that maxillary right central incisor (tooth 11) is intact with grade 1 mobility and no displacement. Thermal testing with cold spray (1,1,1,2-tetrafluoroethane) and electric pulp testing (EPT) yield no response, whereas adjacent teeth respond normally. Periapical radiography shows an intact lamina dura with no root fracture. What is the most plausible explanation for the negative pulp vitality response?

A.Transient pulpal concussion causing temporary neural neuropraxia while pulpal vascular supply remains intact

B.Total ischemic pulpal necrosis that requires immediate emergency pulpectomy and root canal obturation

C.Calcific metamorphosis of the pulp chamber preventing neural electrical transmission

D.Irreversible severance of the apical neurovascular bundle that inevitably causes external inflammatory root resorption

Explanation: Following acute dental trauma (concussion or subluxation), sensory nerve fibers (A-delta and C fibers) can suffer temporary neuropraxia or concussive shock, leading to false-negative responses to both thermal and electric pulp tests. Because vascular perfusion may remain intact, guidelines from the International Association of Dental Traumatology (IADT) and SKDGI advise against immediate endodontic intervention; the tooth should be monitored clinically and radiographically for vitality recovery over several weeks to months.

5A 28-year-old female presents with brief, sharp pain in tooth 46 when drinking iced water. The pain disappears immediately (within 2 seconds) once the cold cup is removed. Clinical examination reveals a deep occlusal carious lesion. The tooth is non-tender to percussion, and periapical radiography reveals no apical pathosis. What is the most likely pulpal diagnosis and appropriate treatment?

A.Reversible pulpitis; caries excavation and placement of a restorative base followed by restoration

B.Symptomatic irreversible pulpitis; pulpectomy and endodontic therapy

C.Pulp necrosis; non-surgical root canal treatment

D.Asymptomatic irreversible pulpitis; complete pulpotomy with MTA followed by an immediate crown

Explanation: Reversible pulpitis is characterized by sharp, transient pain provoked by thermal stimuli (especially cold) that subsides immediately (within 1-2 seconds) after the stimulus is removed, without spontaneous pain. Management consists of removing the causative factor (caries excavation), placing a protective pulp liner or base (such as glass ionomer or calcium hydroxide if deep), and restoring the coronal seal.

6During caries excavation on tooth 25 under rubber dam isolation in a 21-year-old male, an accidental mechanical pulp exposure of 0.8 mm occurs. The tooth had no prior spontaneous symptoms, and the exposed pulp tissue shows bright red bleeding that is controlled with a 2.5% NaOCl-soaked cotton pellet within 2 minutes. Which material and procedure are best indicated?

A.Direct pulp capping using Mineral Trioxide Aggregate (MTA) or calcium silicate cement

B.Immediate full pulpectomy and root canal instrumentation

C.Application of 37% phosphoric acid directly onto the exposed pulp followed by dentin bonding agent

D.Placement of zinc oxide eugenol (ZOE) cement directly in contact with the pulp tissue

Explanation: Direct pulp capping is indicated for small (<1 mm) mechanical or clean traumatic exposures in asymptomatic vital teeth where hemostasis is achieved rapidly. Mineral Trioxide Aggregate (MTA) and hydraulic calcium silicate cements (e.g., Biodentine) are the materials of choice due to superior sealing, biocompatibility, high pH, and induction of a thick dentin bridge (dentinogenesis) without pulpal cytotoxicity.

7A 38-year-old male presents with severe, spontaneous, throbbing pain in tooth 36 that kept him awake all night. The pain radiates to his left ear and worsens significantly with hot soup, but temporarily eases slightly when holding ice water in his mouth. Percussion test elicits moderate pain. Radiography shows deep disto-occlusal radiolucency approaching the pulp chamber and slight widening of the apical periodontal ligament space. What are the definitive pulpal and apical diagnoses?

A.Symptomatic irreversible pulpitis with symptomatic apical periodontitis

B.Reversible pulpitis with normal apical tissues

C.Pulp necrosis with chronic apical abscess

D.Asymptomatic irreversible pulpitis with condensing osteitis

Explanation: Severe, spontaneous, radiating pain exacerbated by heat and partially relieved by cold (due to contraction of gases/liquids reducing intrapulpal pressure) is classic for symptomatic irreversible pulpitis. The tenderness to vertical percussion and widening of the apical PDL indicate that inflammatory mediators have extended beyond the apical foramen into the periodontal ligament, confirming symptomatic apical periodontitis.

8During root canal therapy of tooth 11, the dentist utilizes an electronic apex locator (EAL) to determine the working length. The device screen displays the '0.0' or 'Apex' mark, which corresponds anatomically to the major apical foramen. How should the definitive working length be established relative to this reading?

A.Subtract 0.5 to 1.0 mm from the file length to end instrumentation at the apical constriction (minor diameter)

B.Add 0.5 mm to ensure complete debridement of all bacteria extending past the cementodentinal junction

C.Instrument exactly at the '0.0' reading to create an apical stop at the outer root surface

D.Subtract 3.0 to 4.0 mm to avoid any possibility of irrigant extrusion into the periapical space

Explanation: Electronic apex locators reliably detect the major apical foramen (where the canal meets the periodontal ligament), signaled by the '0.0' or 'Apex' display. The biological terminus for canal preparation and obturation is the apical constriction (minor diameter), which lies approximately 0.5 to 1.0 mm coronal to the major foramen. Therefore, subtracting 0.5–1.0 mm ensures preparation within the canal without damaging periapical tissues.

9During chemo-mechanical preparation of infected root canals, a smear layer containing dentin shavings, necrotic tissue, and bacteria is produced on the canal walls. Which irrigant sequence is the gold standard for achieving complete smear layer removal prior to obturation?

A.17% ethylenediaminetetraacetic acid (EDTA) for 1 minute followed by a final rinse with sodium hypochlorite (NaOCl)

B.37% phosphoric acid for 5 minutes followed by absolute alcohol

C.Hydrogen peroxide 3% mixed simultaneously with sodium hypochlorite

D.Normal saline solution alone used continuously throughout preparation

Explanation: The smear layer has an inorganic component (calcified dentin debris) and an organic component (pulp tissue, bacteria). Chelation with 17% EDTA for 1 minute dissolves the inorganic hydroxyapatite, exposing the organic matrix. A subsequent final rinse with 2.5% to 5.25% NaOCl digests the remaining organic collagen and cleans dentinal tubule openings, optimizing sealer penetration and hermetic obturation.

10Calcium hydroxide [Ca(OH)2] is the most widely utilized intracanal medicament in multi-visit endodontics. What is its primary antimicrobial mechanism of action, and which microorganism is notoriously resistant to it in secondary or persistent endodontic infections?

A.High alkaline pH (~12.5) that damages bacterial cytoplasmic membranes and denatures proteins; Enterococcus faecalis

B.Release of free oxygen radicals in an acidic environment (pH 4.0); Streptococcus mutans

C.Chelation of intracellular calcium and magnesium ions; Porphyromonas gingivalis

D.Direct alkylation of bacterial DNA; Actinomyces israelii

Explanation: Calcium hydroxide releases hydroxyl ions (OH⁻) in aqueous media, generating an intensely alkaline pH of ~12.5. This high pH damages bacterial cell membranes, denatures enzymes, and breaks DNA strands. However, Enterococcus faecalis possesses a proton pump mechanism that maintains intracellular homeostasis under high pH, making it highly resistant to Ca(OH)2 and frequently implicated in persistent endodontic failures.

About the UKDGI Exam

UKDGI is the official competency examination administered by the Indonesian Dental College (KDGI) for dentists seeking certification, foreign-graduated dentists (adaptan), and dentists seeking license re-activation.

Exam sponsor: Kolegium Dokter Gigi (KDG / KDGI) / Konsil Kesehatan Indonesia (KKI). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The exam evaluates general dental practice competency based on the Standar Kompetensi Dokter Gigi Indonesia (SKDGI).

Time Limit

Not published in official sources reviewed.

Passing Score

Not published in official sources reviewed.

Exam / Certification Fees

Not published in official sources reviewed.

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.

16 of 92 practice questions

Conservative Dentistry & Endodontics (Konservasi Gigi)

Cavity preparations, adhesive restorations, glass ionomer cements, pulp diagnostics, vital pulp therapy, endodontic instrumentation, and obturation.

16 of 92 practice questions

Oral & Maxillofacial Surgery and Anesthesia (Bedah Mulut)

Nerve block techniques, exodontia, surgical extraction of impacted teeth, management of fascial space infections, and dental chair emergencies.

17 of 92 practice questions

Prosthodontics (Prostodonsia)

Removable partial dentures, complete dentures, fixed prostheses, impression materials, border molding, and occlusal vertical dimension.

18 of 92 practice questions

Periodontics & Oral Medicine (Periodonsia & Penyakit Mulut)

Periodontal diseases, scaling and root planing, gingival enlargement, oral mucosal ulcers, red and white lesions, and candidiasis.

16 of 92 practice questions

Pediatric Dentistry & Orthodontics (Pedodonsia & Ortodonsia)

Primary teeth pulpal therapy, stainless steel crowns, space management, preventive fluoride application, and malocclusion classification.

9 of 92 practice questions

Dental Radiology, Public Health & Ethics (Radiologi & IKGM)

Intraoral and panoramic radiography, radiation safety, dental caries indices (DMFT), infection prevention (PPI), and Indonesian dental regulations.

Preparing for the UKDGI Exam

What You Need to Know

Passing score: Not published in official sources reviewed.
Assessment: The exam evaluates general dental practice competency based on the Standar Kompetensi Dokter Gigi Indonesia (SKDGI).
Time limit: Not published in official sources reviewed.
Exam / certification fees: Not published in official sources reviewed. Official sources

Using Our Practice Resources

Work through all 92 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

UKDGI: Suggested Study Strategy

1Review the anatomical landmarks for mandibular block anesthesia (inferior alveolar, lingual, and buccal nerves).

2Understand the diagnosis and treatment sequence for irreversible pulpitis and symptomatic apical periodontitis.

3Review the design principles of removable partial dentures, including major connectors, rests, and clasps.

4Familiarize yourself with differential diagnoses of oral ulcers and white lesions based on clinical presentation.

Frequently Asked Questions

What is UKDGI and who takes it?

UKDGI (Uji Kompetensi Dokter Gigi Indonesia) is conducted by Kolegium Dokter Gigi (KDGI) for foreign-trained Indonesian dental graduates completing adaptation, dentists inactive without SIP for over 5 years seeking recertification, and dentists who have not yet received their Sertifikat Kompetensi.

How does UKDGI differ from UKOMNAS PPDG?

UKOMNAS PPDG (formerly UKMP2DG) is the university exit examination for students graduating from Indonesian dental profession programs. UKDGI is administered directly by Kolegium Dokter Gigi primarily for adaptation, recertification, and uncertified practitioners.

What is the STR validity period under UU No. 17 Tahun 2023?

Under UU No. 17 Tahun 2023, the Registration Certificate (STR Dokter Gigi) issued by Konsil Kesehatan Indonesia (KKI) is valid for life. The practice license (SIP Dokter Gigi) issued by local health authorities remains valid for 5 years.

Is this practice exam official?

No. This practice exam is an independent educational question bank developed by OpenExamPrep in English to help practitioners review core dental knowledge. It is not affiliated with or endorsed by KDGI or KKI.