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Dental Hygiene Practice Test

CDCA-ADEX test Format | Course Contents | Course Outline | test Syllabus | test Objectives

Test Detail:
The CDCA-ADEX Dental Hygiene examination is a standardized test designed to evaluate the clinical competence and knowledge of dental hygiene students or graduates. This examination is administered by the Commission on Dental Competency Assessments (CDCA) and is a requirement for dental hygiene licensure in some states. Below is a detailed description of the test- including the number of questions and time allocation- course outline- test objectives- and test syllabus.

Number of Questions and Time:
The CDCA-ADEX Dental Hygiene examination consists of two components: a computer-based written test and a clinical exam. The number of questions and time allocation for each component may vary depending on the specific administration. Typically- the written test consists of multiple-choice questions- and the time given is around 4-5 hours. The clinical test involves performing dental hygiene procedures on patients- and the time allocation can range from several hours to a full day.

Course Outline:
The CDCA-ADEX Dental Hygiene examination covers a wide range of subjects related to dental hygiene theory- practice- and clinical skills. While the exact course outline may vary- the following are common areas covered in the examination:

1. Dental Anatomy and Physiology:
- Structure and function of teeth and surrounding oral tissues
- Oral cavity landmarks and anatomical structures
- Physiology of the oral cavity and associated systems

2. Oral Health Assessment:
- Dental and periodontal charting
- Radiographic interpretation and analysis
- Oral health risk assessment
- Oral pathology recognition

3. Dental Hygiene Treatment Planning and Implementation:
- Patient assessment and diagnosis
- Treatment plan development
- Dental prophylaxis and scaling procedures
- Application of preventive measures (fluoride- sealants- etc.)
- Local anesthesia administration (if allowed by state regulations)

4. Dental Hygiene Clinical Skills:
- Instrumentation techniques (hand and ultrasonic scaling)
- Periodontal instrumentation and root planing
- Soft tissue management (curettage- debridement- etc.)
- Patient education and oral hygiene instruction
- Infection control and sterilization procedures

Exam Objectives:
The objectives of the CDCA-ADEX Dental Hygiene examination are to assess the candidate's competence in dental hygiene theory- clinical skills- and patient care. The test aims to evaluate the following:

1. Knowledge of dental anatomy- physiology- and oral health assessment techniques.
2. Competence in developing comprehensive dental hygiene treatment plans.
3. Proficiency in performing dental hygiene procedures- including scaling- root planing- and prophylaxis.
4. Ability to apply infection control and sterilization protocols.
5. Capability to communicate effectively with patients and provide oral health education.

Exam Syllabus:
The CDCA-ADEX Dental Hygiene examination syllabus outlines the specific subjects and competencies covered in the exam. The syllabus typically includes the following areas:

- Dental Anatomy and Physiology
- Oral Health Assessment
- Dental Hygiene Treatment Planning and Implementation
- Dental Hygiene Clinical Skills
- Infection Control and Sterilization Procedures
- Patient Education and Communication

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CDCA-ADEX
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Question: 1123
A 57-year-old female patient with no known medical history presents for scaling due to 6 mm pockets.
Vital signs are: blood pressure 130/85 mmHg, pulse 70 bpm, respiratory rate 26 breaths/min. She denies
respiratory symptoms but appears restless. Considering her respiratory rate, what is the most immediate
action?
A. Proceed with scaling and monitor breathing
B. Administer a bronchodilator
C. Provide oxygen at 4 L/min
D. Evaluate for potential respiratory compromise
Answer: D
Explanation: A respiratory rate of 26 breaths/min is elevated, potentially indicating hypoxia, anxiety, or
an undiagnosed condition. Evaluating for compromise (e.g., pulse oximetry, history) ensures no serious
issues are missed. Bronchodilators or oxygen are premature, and proceeding risks overlooking a critical
condition.
Question: 1124
During a busy clinic session, a dental hygienist accidentally drops a container of dental amalgam,
resulting in a mercury spill on the operatory floor. The spill covers an area approximately 10 cm in
diameter. Considering the potential health hazards and environmental safety protocols, which of the
following represents the most appropriate sequence of actions to manage this incident safely and
effectively, in accordance with OSHA and EPA guidelines?
A. Use a vacuum cleaner to remove the mercury, disinfect the area, and resume treatment
B. Wipe the spill with a paper towel, place it in a biohazard bag, and clean the area with bleach
C. Ventilate the area, use a mercury spill kit to collect the spill, and dispose of materials in a hazardous
waste container
D. Cover the spill with gauze, notify the dentist, and continue patient care
Answer: C
Explanation: Mercury is a hazardous substance that requires careful handling to prevent vapor inhalation
and environmental contamination. Ventilating the area reduces mercury vapor concentration. Using a
specialized mercury spill kit ensures safe collection without spreading the spill. Disposal in a hazardous
waste container complies with EPA regulations. Vacuuming can aerosolize mercury, wiping with paper
towels is ineffective and risky, and covering with gauze does not address the hazard.
Question: 1125
You are treating a patient with severe xerostomia due to Sj�gren�s syndrome. To effectively manage her
condition, which of the following strategies should be included in her treatment plan?
A. Frequent consumption of sugary snacks
B. Daily use of a fluoride mouth rinse
C. Regular intake of alcoholic beverages
D. Avoidance of all dairy products
Answer: B
Explanation: Daily use of a fluoride mouth rinse helps to protect against caries and manage xerostomia
by providing additional fluoride to strengthen tooth enamel.
Question: 1126
A 28-year-old patient presents with no complaints. A bitewing radiograph reveals a radiopaque deposit
on the mesial surface of tooth #19, extending 1 mm below the CEJ, with no bone loss. The clinical exam
confirms a hard deposit. What is the most likely diagnosis?
A. Enamel pearl
B. Supragingival calculus
C. Composite restoration
D. Subgingival calculus
Answer: D
Explanation: The radiopaque deposit extending below the CEJ, confirmed as a hard deposit, indicates
subgingival calculus. Supragingival calculus would be above the CEJ, a composite restoration would have
defined margins, and an enamel pearl would be a small, round radiopacity near the root.
Question: 1127
A 72-year-old male patient presents for a comprehensive examination. Extraoral assessment reveals
bilateral TMJ clicking and tenderness, with a maximum opening of 30 mm. Intraoral examination shows
a 3 cm white, non-scrapable patch on the lateral tongue and palpable induration. He reports a 40-year
history of cigar smoking. What is the most critical step for oral cancer screening?
A. Refer to a specialist for biopsy
B. Perform toluidine blue staining
C. Advise cessation and monitor lesion
D. Prescribe an antiseptic rinse
Answer: A
Explanation: A white patch with induration on the lateral tongue in a smoker is highly concerning for
leukoplakia or squamous cell carcinoma. Referral for biopsy is essential for definitive diagnosis. Staining
is unreliable, monitoring delays treatment, and rinses do not address the lesion�s malignant potential.
Question: 1128
A dental hygienist is concerned about a patient with suspected viral hepatitis. What should be included in
the infection control protocol for this patient?
A. Increased frequency of dental visits
B. Referral to a specialist for further evaluation
C. Avoid all dental procedures until the condition is confirmed
D. Use of standard precautions
Answer: D
Explanation: The use of standard precautions is essential when treating any patient, including those with
suspected viral hepatitis, to prevent potential transmission of infectious diseases.
Question: 1129
A patient expresses concern about the potential risks of a proposed dental treatment. How should the
dental hygienist ethically respond while adhering to the principle of beneficence?
A. Assure the patient that there are no risks involved
B. Dismiss the patient's concerns as unnecessary
C. Provide a detailed explanation of the potential risks and benefits
D. Recommend the patient seeks a second opinion
Answer: C
Explanation: Providing a detailed explanation of the potential risks and benefits respects the patient's
right to informed consent while adhering to the principle of beneficence in promoting patient welfare.
Question: 1130
In assessing a patient�s radiographs, you note significant bone loss around the molars, particularly around
the furcation areas. What classification of periodontal disease does this suggest?
A. Stage I periodontal disease
B. Stage II periodontal disease
C. Stage IV periodontal disease
D. Stage III periodontal disease
Answer: D
Explanation: Significant bone loss around furcation areas indicates advanced periodontal disease,
classifying it as Stage III, which requires comprehensive periodontal treatment.
Question: 1131
A dental office uses a chemical vapor sterilizer for heat-sensitive instruments. During a routine check, the
hygienist notes that the internal chemical indicator strip shows no color change after a cycle. According
to the 2024 ADA guidelines, what is the immediate next step?
A. Use the instruments, as external indicators are sufficient
B. Repeat the cycle with a new chemical indicator
C. Reclean and resterilize the instruments in a different sterilizer
D. Discard the instruments and order replacements
Answer: C
Explanation: A chemical indicator strip failing to change color indicates that the sterilization parameters
(e.g., temperature, chemical vapor exposure) were not met, per the 2024 ADA guidelines. The
instruments must be considered non-sterile, recleaned, and resterilized in a functioning sterilizer.
Repeating the cycle risks missing underlying issues, and external indicators alone are not sufficient.
Discarding instruments is unnecessary unless they are damaged.
Question: 1132
A dental hygienist is presented with a patient who refuses fluoride treatment due to concerns about
toxicity, citing online articles. The hygienist explains the evidence-based benefits and risks, but the
patient remains unconvinced and requests alternative preventive measures. Under the ADHA Code of
Ethics, what is the hygienist�s most ethical course of action to uphold the principle of nonmaleficence
while respecting patient choice?
A. Document the refusal and provide alternative preventive options like sealants.
B. Proceed with fluoride treatment to prevent caries, as it is standard protocol.
C. Insist on fluoride treatment, emphasizing its necessity for oral health.
D. Refuse to treat the patient unless fluoride is accepted.
Answer: A
Explanation: Nonmaleficence requires the hygienist to avoid harm while respecting patient autonomy. By
documenting the patient�s refusal and offering evidence-based alternatives, such as sealants or xylitol
products, the hygienist minimizes the risk of caries without violating the patient�s right to refuse
treatment. Insisting on fluoride or refusing care would disregard autonomy and potentially harm the
patient-provider relationship.
Question: 1133
A 55-year-old patient with Stage III, Grade C periodontitis and rheumatoid arthritis undergoes NSPT.
Probing depths are 5-6 mm, BOP is 50%, and plaque index is 20%. Per AAP guidelines, what is the role
of host-modulation therapy in the individualized care plan?
A. No role unless surgery is planned
B. Apply local corticosteroids in pockets
C. Prescribe NSAIDs for pain control
D. Use low-dose doxycycline to reduce inflammation
Answer: D
Explanation: AAP supports low-dose doxycycline (20 mg) as a host-modulation therapy to reduce
inflammation and collagenase activity in high-risk periodontitis patients with systemic conditions like
rheumatoid arthritis. NSAIDs are for symptom relief, corticosteroids lack evidence, and modulation is
beneficial regardless of surgery.
Question: 1134
During a dietary assessment, you find that a patient regularly consumes flavored yogurt but does not read
the labels. What advice should you provide regarding the potential cariogenic nature of these products?
A. All flavored yogurts are safe for dental health
B. They should choose plain yogurt to avoid added sugars that can contribute to caries
C. Flavored yogurts should be consumed only in moderation
D. Yogurt is always beneficial for dental health regardless of flavor
Answer: B
Explanation: Advising the patient to choose plain yogurt can help them avoid added sugars that
contribute to tooth decay, promoting better oral health.
Question: 1135
A 47-year-old male patient presents for a hygiene visit. His medical history includes hyperthyroidism
treated with methimazole. Vital signs are: blood pressure 130/85 mmHg, pulse 105 bpm, respiratory rate
16 breaths/min. He reports palpitations. Considering his pulse rate, what is the most appropriate action?
A. Reassure and proceed with treatment
B. Evaluate for tachycardia and consult physician
C. Administer oxygen to stabilize vitals
D. Monitor pulse every 10 minutes
Answer: B
Explanation: A pulse of 105 bpm with palpitations suggests tachycardia, possibly from hyperthyroidism
or medication issues. Evaluating and consulting the physician ensures safety. Reassuring or monitoring
risks missing a serious condition, and oxygen is unwarranted.
Question: 1136
A patient presents with a periodontal condition that has not improved despite several rounds of scaling
and root planing. When should a referral to a periodontist be initiated?
A. After one round of SRP
B. If there is no improvement after two rounds of SRP
C. Only if the patient requests a referral
D. After a full year of treatment
Answer: B
Explanation: A referral to a periodontist should be initiated if there is no improvement after two rounds
of scaling and root planing, indicating the need for specialized care.
Question: 1137
A 60-year-old patient with a history of periodontal disease presents for a hygiene visit. A periapical
radiograph of tooth #9 shows a radiolucency at the apex, measuring 5 mm, with a loss of lamina dura.
The tooth is non-vital and has a crown. What is the most likely diagnosis?
A. Periapical cyst
B. Chronic apical periodontitis
C. Periapical granuloma
D. Acute apical abscess
Answer: A
Explanation: The 5 mm radiolucency at the apex of a non-vital tooth with a crown suggests a periapical
cyst, which is a chronic lesion often larger than 5 mm. Chronic apical periodontitis typically has smaller
radiolucencies, a periapical granuloma is less defined, and an acute apical abscess would have acute
symptoms.
Question: 1138
In your counseling session, a patient asks why they should avoid consuming fruit juices regularly. What
is the most accurate explanation regarding the cariogenic effects of fruit juices?
A. Fruit juices are high in fiber
B. Fruit juices contain acids and sugars that can contribute to tooth decay
C. All juices are beneficial for dental health
D. Fruit juices can only be consumed in moderation
Answer: B
Explanation: Fruit juices often contain both sugars and acids, which can contribute to tooth decay and
erosion if consumed frequently, highlighting the importance of moderation.
Question: 1139
A 58-year-old female patient with type 1 diabetes (HbA1c 8.5%) presents with a painful gingival abscess
and 7 mm pockets in the maxillary posterior region. Her blood glucose is 200 mg/dL. Radiographs show
bone loss and furcation involvement. What is the most critical step before initiating periodontal therapy?
A. Prescribe antibiotics and analgesics
B. Perform incision and drainage of the abscess
C. Consult with her physician for glucose management
D. Schedule a follow-up for reevaluation
Answer: C
Explanation: Uncontrolled diabetes (HbA1c 8.5%, glucose 200 mg/dL) impairs healing and increases
infection risk. Consulting the physician to optimize glucose control is essential before invasive
procedures like abscess drainage or periodontal therapy. Antibiotics may be needed, but systemic stability
is priority. Follow-up alone delays treatment.
Question: 1140
A dental hygienist is classifying instruments for a new sterilization protocol. The clinic uses explorers
that contact intact gingiva but do not penetrate tissue. According to the Spaulding classification, how
should these explorers be categorized, and what is the minimum processing requirement?
A. Critical, sterilization
B. Semi-critical, high-level disinfection
C. Non-critical, intermediate-level disinfection
D. Non-critical, low-level disinfection
Answer: B
Explanation: Explorers contacting gingiva are semi-critical, as they touch mucous membranes without
penetrating tissue. High-level disinfection is required to eliminate most pathogens, though sterilization is
preferred for added safety, per Spaulding classification.
Question: 1141
In your assessment of a patient with a high sugar diet, you find they consume numerous sugary snacks
throughout the day. What dietary change would you suggest that could help reduce their risk of caries?
A. Limit sugary snacks to once a week
B. Replace sugary snacks with nuts and cheese
C. Increase the frequency of brushing
D. Maintain their current diet but add mouthwash
Answer: B
Explanation: Replacing sugary snacks with nuts and cheese provides nutritional benefits while reducing
the risk of caries, as these options are non-cariogenic and can help neutralize acids in the mouth.
Question: 1142
A 59-year-old patient with a history of smoking presents for periodontal evaluation. Probing depths are
5-7 mm generalized, with bleeding on probing at 50% of sites. On the mesiopalatal of tooth #2, the
probing depth is 6 mm, and the gingival margin is 2 mm apical to the CEJ. A Nabers probe detects a 4
mm furcation penetration on tooth #2. Radiographs show bone loss of 22% root length. What is the
periodontal stage and furcation class?
A. Stage II, Class I
B. Stage III, Class II
C. Stage IV, Class III
D. Stage III, Class I
Answer: B
Explanation: Generalized probing depths of 5-7 mm and bone loss of 22% indicate Stage III periodontitis
(15-33%). The CAL at the mesiopalatal of tooth #2 is 6 mm + 2 mm = 8 mm, supporting Stage III. The
4 mm furcation penetration is Glickman�s Class II (cul-de-sac, >3 mm). Smoking history suggests Grade
C. Stage II is for <15% bone loss, and Stage IV requires tooth loss or severe complexity. Class I is =3
mm, and Class III is through-and-through.
Question: 1143
A dental practice is audited for compliance with OSHA�s 2024 sharps safety regulations. The auditor
observes that used needles are recapped using a two-handed technique before disposal. What is the
violation, and what is the correct procedure?
A. Violation of PPE standards; wear heavier gloves
B. Violation of engineering controls; install a needle incinerator
C. Violation of work practice controls; use a one-handed scoop technique
D. No violation; two-handed recapping is acceptable
Answer: C
Explanation: OSHA�s 2024 Bloodborne Pathogens Standard prohibits two-handed needle recapping due
to the risk of needlestick injuries, classifying it as a violation of work? practice controls. The correct
procedure is to use a one-handed scoop technique or a mechanical recapping device to minimize
exposure. Engineering controls like sharps containers are required but unrelated to recapping technique,
and heavier gloves do not address the issue. Two-handed recapping is explicitly non-compliant.
Question: 1144
A patient has been using nicotine patches to help quit smoking but is still experiencing cravings. What is
the best way to Assist her according to the 5 A's model?
A. Advise her to increase the patch dosage
B. Arrange for a counseling session to develop coping strategies
C. Ask her to keep a journal of cravings
D. Suggest she try vaping as an alternative
Answer: B
Explanation: Arranging for a counseling session provides the patient with additional support and coping
strategies to manage cravings effectively.
Question: 1145
A 68-year-old patient presents for a recall exam, and you are charting using the ADA tooth numbering
system. Tooth #3 is missing, and tooth #4 has a carious lesion on the distal surface. The lesion is
cavitated, soft, and extends into the dentin, as shown on a bitewing radiograph (radiolucency beyond the
dentinoenamel junction). The patient reports sensitivity to sweets. What is the most likely caries
classification for tooth #4?
A. Arrested caries
B. Incipient caries
C. Active dentin caries
D. Secondary caries
Answer: C
Explanation: The cavitated, soft lesion on the distal surface of tooth #4, extending into the dentin with
radiographic confirmation and sweet sensitivity, indicates active dentin caries. This type is progressive
and symptomatic. Arrested caries is hard. Incipient caries is enamel-limited. Secondary caries occurs at
restoration margins.
Question: 1146
A 55-year-old male patient with von Willebrand disease type 1 presents for scaling. His hematologist
administers DDAVP preoperatively. Intraoral findings include 6 mm pockets and heavy calculus. If
bleeding occurs during scaling, which agent is most effective for hemostasis?
A. Epinephrine-soaked gauze
B. Collagen sponge
C. Saline irrigation
D. Tranexamic acid rinse
Answer: D
Explanation: Tranexamic acid rinse stabilizes clots, ideal for mucosal bleeding in von Willebrand disease.
Collagen sponges are less effective, saline does not promote hemostasis, and epinephrine risks systemic
absorption.
Question: 1147
A dental hygienist is taking a cephalometric radiograph for an orthodontic patient. To follow ALARA,
the hygienist adjusts the machine to 70-90 kVp, 5-15 mA, and 0.5-1.0 seconds. Which settings and
protections minimize exposure while ensuring a clear image?
A. 90 kVp, 15 mA, 1.0 seconds, no lead apron
B. 90 kVp, 5 mA, 0.8 seconds, lead apron only
C. 80 kVp, 10 mA, 0.7 seconds, thyroid collar only
D. 70 kVp, 5 mA, 0.5 seconds, lead apron with thyroid collar
Answer: D
Explanation: ALARA requires minimal dose. Lower kVp (70), mA (5), and exposure time (0.5 seconds)
reduce radiation while maintaining image clarity for cephalometric purposes. A lead apron with thyroid
collar protects sensitive tissues, ensuring safety.
Question: 1148
A dental hygienist administers a desensitizing agent under general supervision, unaware that the state
requires direct supervision for any topical medicament application. The patient has no adverse effects.
What is the legal implication?
A. Violation of supervision laws, risking disciplinary action.
B. No violation, as no harm occurred.
C. Compliant, as desensitizing agents are low-risk.
D. Permissible, as general supervision covers medicaments.
Answer: A
Explanation: Applying a desensitizing agent under general supervision violates the state�s direct
supervision requirement for topical medicaments. This breach of the dental practice act could lead to
sanctions, such as a warning or fine, regardless of patient outcomes, as supervision rules ensure oversight
for safety.
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