QCHP/DHP Dental Hygienist Licensing Exam (Qatar)

What is the primary goal of non-surgical periodontal therapy, including scaling and root planing?

• ATo eliminate the need for future surgical interventions.
• BTo disrupt biofilm and remove calculus from tooth surfaces.
• CTo increase the attachment level of the periodontium.
• DTo whiten the teeth and improve esthetics.

Which of the following components of an X-ray machine is responsible for heating the filament to produce electrons?

• AAnode
• BCathode
• CFocusing cup
• DStep-up transformer

Which major salivary gland is located anterior to the ear, superficial to the masseter muscle?

• ASublingual gland
• BSubmandibular gland
• CParotid gland
• DMinor salivary glands

Which medication reported in a dental patient's history most directly increases the risk of prolonged bleeding during periodontal instrumentation?

• AMetformin
• BApixaban
• CLevothyroxine
• DAmoxicillin

Which three physical parameters should be monitored and recorded for each steam sterilizer cycle?

• APressure, temperature, time
• BTemperature, pressure, load
• CTime, temperature, chemical indicator
• DSteam, temperature, time

A periodontal site has a 6 mm probing depth, bleeding on probing, and horizontal alveolar bone loss. The pocket base is coronal to the adjacent alveolar crest. Which type of periodontal pocket is present?

• AGingival pocket
• BSuprabony pocket
• CInfrabony pocket
• DPseudopocket

Which of the following is the most effective method for reducing patient exposure to radiation during dental radiography?

• AIncreasing the kVp
• BUsing a faster film speed or digital sensor
• CDecreasing the source-to-film distance
• DUsing a smaller focal spot size

The foramen magnum is a prominent feature of which cranial bone?

• AFrontal bone
• BParietal bone
• COccipital bone
• DSphenoid bone

Which method of fluoride delivery provides both systemic and topical benefits?

• AFluoride varnish application
• BDaily fluoride rinse
• CCommunity water fluoridation
• DProfessional fluoride gel application

According to infection control guidelines, what is the appropriate classification for an instrument that contacts intact mucous membranes but does not penetrate soft tissue?

• ACritical
• BSemi-critical
• CNon-critical
• DEnvironmental surface

A 45-year-old patient presents with generalized interdental clinical attachment loss of 4-5mm, probing depths of 5-6mm, extensive radiographic bone loss extending to the middle third of the root, and tooth mobility. The patient also has a history of rapid progression despite good oral hygiene. Based on the 2017 AAP/EFP classification, how would this patient's periodontitis most likely be classified?

• AStage I, Grade A
• BStage II, Grade B
• CStage III, Grade C
• DStage IV, Grade B

An otherwise correctly processed film radiograph is uniformly too light. Which exposure error is the most likely cause?

• AOverexposure
• BUnderexposure
• CElongation
• DForeshortening

A patient presents with a white lesion on the buccal mucosa that cannot be scraped off. It has a rough, corrugated surface and is asymptomatic. The patient is a heavy smoker. What is the most appropriate initial clinical diagnosis?

• ACandidiasis
• BLichen planus
• CLeukoplakia
• DWhite spongiform nevus

Which type of professionally applied topical fluoride is recommended for patients with porcelain or composite restorations due to its neutral pH?

• AAcidulated Phosphate Fluoride (APF) gel
• BStannous Fluoride (SnF2) solution
• CSodium Fluoride (NaF) gel or varnish
• DFluoride foam

What is the primary purpose of using an ultrasonic cleaner prior to sterilization of dental instruments?

• ATo sterilize the instruments before autoclaving.
• BTo lubricate hinges and joints of instruments.
• CTo remove debris and bioburden from instruments.
• DTo disinfect instruments for immediate patient use.

Which of the following instruments is designed to remove heavy calculus deposits and is characterized by a triangular cross-section?

• AUniversal curet
• BGracey curet
• CPeriodontal probe
• DSickle scaler

A dental hygienist notices a dark, crescent-shaped artifact on the corner of several processed radiographs. What is the most likely cause of this processing error?

• ALight leak in the darkroom
• BOverlapping films during processing
• CDeveloper solution too cold
• DFingernail or bending artifact

The temporomandibular joint (TMJ) is formed by the articulation of the condyle of the mandible with which bone(s)?

• AZygomatic bone
• BMaxilla and Palatine bones
• CTemporal bone
• DSphenoid and Occipital bones

A 7-year-old at high caries risk has primary drinking water with less than 0.3 ppm fluoride, no other significant fluoride source, and an authorized fluoride-supplement prescription. What daily dose matches the age-based schedule?

• A0.25 mg
• B0.50 mg
• C1.00 mg
• DNo supplement is needed

Which monitoring method most directly verifies that a sterilizer cycle killed highly resistant test microorganisms?

• ABiological indicators
• BChemical indicators (external)
• CMechanical indicators
• DProcess indicators

During a periodontal assessment, a dental hygienist records a probing depth of 6mm and a gingival margin located 2mm coronal to the CEJ. What is the calculated clinical attachment loss (CAL) for this site?

• A4mm
• B6mm
• C8mm
• D2mm

Which radiographic projection is best suited for detecting interproximal caries on posterior teeth?

• APeriapical radiograph
• BOcclusal radiograph
• CBitewing radiograph
• DPanoramic radiograph

A biopsy reveals a lesion composed of interlacing bundles of smooth muscle cells, originating from the wall of a blood vessel. What is the most likely diagnosis?

• AFibroma
• BLipoma
• CLeiomyoma
• DNeurofibroma

Which of the following is considered the primary mechanism of action for topical fluoride in preventing dental caries?

• AKilling cariogenic bacteria in plaque.
• BIncreasing the solubility of enamel in acid.
• CInhibiting bacterial metabolism and acid production.
• DEnhancing remineralization and reducing demineralization.

A patient with suspected infectious pulmonary tuberculosis arrives for elective dental hygiene care. What is the appropriate initial management?

• AProceed using routine surgical-mask precautions
• BDefer elective care and arrange medical evaluation
• CTake an impression first and disinfect it before referral
• DGive prophylactic antibiotics and complete treatment

A patient has multiple porcelain veneers and composite restorations. Which professional fluoride product should generally be avoided because its acidity can roughen or etch these materials?

• ASodium Fluoride (NaF) varnish
• BAcidulated Phosphate Fluoride (APF) gel
• CStannous Fluoride (SnF2) solution
• DNeutral Sodium Fluoride (NaF) gel

Which of the following is the most effective method for sterilizing heat-sensitive dental instruments that cannot withstand high temperatures?

• AAutoclaving
• BDry heat sterilization
• CChemical vapor sterilization
• DEthylene oxide sterilization

A tooth is non-vital and tender to biting. Its periapical radiograph shows widening of the periodontal ligament space at the apex without a well-defined radiolucent lesion. Which diagnosis best fits?

• APeriodontal health
• BEarly stage of periapical cemento-osseous dysplasia
• CAcute apical periodontitis
• DNormal physiological tooth movement

Which anatomical structure located superior to the maxillary molars is often mistaken for a periapical lesion on a dental radiograph?

• AZygomatic arch
• BMaxillary sinus
• CPterygoid process
• DCoronoid process

During a periodontal assessment, a dental hygienist notes bleeding on probing (BOP) in a patient with 4mm pockets but no clinical attachment loss (CAL). This finding is most indicative of:

• AChronic periodontitis
• BAggressive periodontitis
• CGingivitis
• DNecrotizing ulcerative periodontitis

What is the recommended amount of fluoride toothpaste for a child aged 3 to 6 years, according to current oral health guidance?

• AA smear (rice-grain) sized amount
• BA pea-sized amount
• CA full brush-length ribbon
• DNo fluoride toothpaste until age 6

A patient with a previous episode of infective endocarditis is scheduled for scaling that will manipulate gingival tissue. What should be confirmed before treatment?

• AAdminister a broad-spectrum antibiotic after the procedure
• BProvide a chlorhexidine mouthrinse before the procedure
• CPerform a thorough dental prophylaxis immediately before the procedure
• DConfirm indicated prophylaxis with the treating prescriber

Which anatomical landmark is typically visible as a radiopaque inverted 'Y' formation in maxillary anterior periapical radiographs?

• AIncisive foramen near the central incisors
• BNasopalatine canal in the anterior maxilla
• CNasal-fossa and maxillary-sinus junction
• DAnterior nasal spine at the nasal floor

What is the contemporary objective of subgingival root-surface instrumentation during non-surgical periodontal therapy?

• ATo remove only supragingival stain
• BTo remove biofilm and calculus while preserving sound root
• CTo remove all cementum until dentin is exposed
• DTo surgically excise the pocket epithelium

Which of the following is an example of an opportunistic oral infection commonly seen in immunocompromised patients, such as those with HIV/AIDS?

• ARecurrent aphthous stomatitis
• BTraumatic fibroma
• COral candidiasis (Thrush)
• DHerpes labialis

For a patient undergoing radiation therapy to the head and neck, which preventive measure is most crucial for long-term oral health?

• ADaily use of a desensitizing toothpaste
• BRegular consumption of acidic beverages to stimulate saliva flow
• CDaily application of prescription-strength fluoride gel or varnish
• DImmediate scaling and root planing to remove all calculus

When taking a panoramic radiograph, what error would result in the anterior teeth appearing blurred and narrowed?

• APatient positioned too far back in the focal trough
• BPatient positioned too far forward in the focal trough
• CChin tipped too low
• DChin tipped too high

Which type of immunity is gained when an individual receives antibodies from an external source, such as maternal antibodies passed to a fetus?

• AActive natural immunity
• BActive artificial immunity
• CPassive natural immunity
• DPassive artificial immunity

For a patient who reports pain during deep subgingival instrumentation, which measure most directly improves procedural comfort?

• AThe type of ultrasonic insert used
• BThe use of proper ergonomic positioning
• CAppropriate local anesthesia or individualized pain management
• DThe patient's dietary habits prior to the appointment

Under the 2017 periodontitis grading framework, which finding is direct evidence supporting Grade C rapid progression?

• ANo attachment or radiographic bone loss over five years
• BLess than 2 mm of radiographic bone loss over five years
• CAt least 2 mm of radiographic bone loss over five years
• DStable gingival recession without attachment loss

Under ICRP occupational guidance, what annual effective-dose limit is averaged over defined five-year periods for radiation workers?

• A1 mSv (0.1 rem)
• B5 mSv (0.5 rem)
• C20 mSv (2 rem)
• D50 mSv (5 rem)

Which of the following oral hygiene aids is most effective for cleaning concave root surfaces, furcations, and interproximal areas with recession?

• AManual toothbrush with medium bristles
• BDental floss
• CInterdental brush
• DWater flosser

What is the purpose of Standard Precautions in a dental setting?

• ATo prevent patient-to-patient disease transmission only
• BTo protect patients from environmental contamination
• CTo apply minimum infection-prevention practices to every patient
• DTo eliminate the need for sterilization of dental instruments

During an extraoral head-and-neck examination, a dental hygienist palpates a hard, fixed, non-tender cervical lymph node that the patient says has persisted for six weeks. What is the most appropriate action?

• AReassure the patient that fixed nodes are normal
• BMassage the node and review it after one year
• CBegin antibiotics without further assessment
• DDocument and arrange prompt evaluation or referral