Southern Regional Testing Agency (SRTA) Overview
These study notes are designed to prepare candidates for the Southern Regional Testing Agency (SRTA) dental hygiene clinical exam, which is part of the ADEX consortium. The notes focus on entry-to-practice competencies, covering patient assessment, periodontal evaluation, radiography, instrumentation, dental anatomy, infection control, and ethics. Candidates should verify all exam-specific details (e.g., format, pass mark, dates) with the official SRTA or ADEX sources.
For Dental Conquer practice planning, this module is tracked as 80 questions over about 120 minutes with a listed pass mark of 70%. Treat those numbers as practice baselines and verify the current official format before scheduling.
How This Guide Is Organized
The sections below turn the syllabus into studyable subject blocks. Read a subject first, explain the must-know ideas without notes, then use questions and flashcards to test whether the knowledge holds under pressure.
- Comprehensive Patient Assessment and Medical History
- Periodontal Evaluation and Data Collection
- Radiographic Interpretation and Radiation Safety
- Clinical Instrumentation and Calculus Removal
- Dental Anatomy, Morphology, and Occlusion
- Infection Control, Ethics, and Jurisprudence
Exam Snapshot and Readiness Target
Format: Clinical skills assessment (OSCE/CSCE) and patient-based examinations; practice baseline: 80 questions, 120 minutes, pass mark 70%
Candidate level: Entry-to-practice dental hygiene licensure
Readiness target: Competent in clinical decision-making, patient management, and procedural skills as per ADEX standards
Most candidates should budget at least 38+ focused study hours, then adjust upward for unfamiliar clinical systems, regulatory content, or specialty-level case reasoning.
Comprehensive Patient Assessment and Medical History
Syllabus Focus
- Medical history review and updates
- Vital signs measurement and interpretation
- Extraoral and intraoral examination
- Risk assessment (caries, periodontal disease, oral cancer)
- Pharmacological considerations and drug interactions
Key Notes
- A thorough medical history must be obtained and updated at each visit; include allergies, medications, systemic conditions (e.g., diabetes, hypertension, bleeding disorders), and social history (tobacco, alcohol).
- Vital signs (blood pressure, pulse, respiration) are essential; hypertension may require referral or modification of care (e.g., avoid epinephrine if uncontrolled).
- Extraoral exam includes lymph nodes, TMJ, and skin; intraoral exam includes soft tissues, hard palate, floor of mouth, and tongue; document any abnormalities.
- Caries risk assessment uses factors like diet, fluoride exposure, saliva flow, and past caries history; use tools like CAMBRA.
- Medication review: anticoagulants (bleeding risk), bisphosphonates (MRONJ risk), immunosuppressants (infection risk), and anticholinergics (xerostomia).
Must Know
- Know normal vital sign ranges: BP <120/80, pulse 60-100 bpm, respirations 12-20/min.
- Recognize contraindications to dental hygiene care: recent MI (<6 months), uncontrolled hypertension (>180/110), severe bleeding disorders.
- Understand the significance of ASA classification: ASA I (healthy) to ASA IV (severe systemic disease) affects treatment planning.
- Identify signs of oral cancer: red/white lesions, ulcerations >2 weeks, induration, lymphadenopathy.
Clinical and Exam Application
- When a patient reports a new medication, assess its impact on dental hygiene procedures (e.g., anticoagulants require INR check).
- If a patient has a history of infective endocarditis, determine if antibiotic prophylaxis is needed per AHA guidelines.
- For a patient with xerostomia, recommend saliva substitutes, fluoride trays, and frequent recall.
High-Yield Distinctions
- Distinguish between absolute and relative contraindications for dental hygiene care.
- Differentiate between benign and malignant oral lesions: leukoplakia vs. lichen planus vs. carcinoma.
- Know the difference between ASA III (stable) and ASA IV (unstable) and how it affects treatment urgency.
Common Pitfalls
- Failing to update medical history at each visit; assume no changes without asking.
- Misinterpreting elevated BP as anxiety without confirming with repeat measurement.
- Overlooking medication-induced xerostomia as a caries risk factor.
Review Tasks
- Practice taking and recording vital signs on a partner.
- Review the AHA antibiotic prophylaxis guidelines for dental procedures.
- Study the TNM staging for oral cancer and common oral pathology.
Periodontal Evaluation and Data Collection
Syllabus Focus
- Periodontal probing and charting
- Clinical attachment level (CAL) measurement
- Bleeding on probing (BOP) and suppuration
- Furcation involvement and mobility
- Periodontal classification (2018 AAP/EFP)
Key Notes
- Periodontal probing should be performed at six sites per tooth (mesiobuccal, buccal, distobuccal, mesiolingual, lingual, distolingual) using a calibrated probe (e.g., UNC-15).
- CAL is calculated as probing depth (PD) + gingival recession (or - if overgrowth); it reflects true attachment loss.
- BOP indicates inflammation; absence of BOP suggests periodontal health. Suppuration indicates active infection.
- Furcation involvement is graded I-III: Grade I (probe enters <1/3), Grade II (>1/3 but not through), Grade III (through-and-through).
- Mobility is classified as Class I (0.2-1 mm horizontal), Class II (>1 mm horizontal), Class III (vertical mobility).
Must Know
- Know the 2018 AAP/EFP classification: Periodontal health, gingivitis, periodontitis (staging I-IV, grading A-C), and other conditions.
- Understand the difference between chronic and aggressive periodontitis (now replaced by staging/grading).
- Recognize that probing depths >4 mm with BOP indicate periodontitis; >6 mm with BOP indicate severe disease.
- Identify risk factors: smoking, diabetes, poor oral hygiene, genetic susceptibility.
Clinical and Exam Application
- When a patient has generalized probing depths of 5-6 mm with BOP, classify as Stage II periodontitis; recommend scaling and root planing (SRP) with 3-month recall.
- For a patient with furcation Grade II on a maxillary molar, consider surgical referral for root resection or regeneration.
- If a patient has localized probing depths >7 mm with suppuration, document as Stage III periodontitis and consider adjunctive antibiotics.
High-Yield Distinctions
- Distinguish between gingivitis (no attachment loss) and periodontitis (attachment loss).
- Differentiate between a periodontal abscess and a periapical abscess: periodontal abscess has deep pocket, vital tooth; periapical has non-vital tooth.
- Know the difference between clinical attachment loss (CAL) and probing depth (PD): CAL is more accurate for disease severity.
Common Pitfalls
- Confusing probing depth with clinical attachment level; always measure recession.
- Failing to record BOP at each site; BOP is a key indicator of inflammation.
- Misclassifying furcation involvement due to improper probe angulation.
Review Tasks
- Practice probing on a typodont or partner, ensuring correct angulation and pressure (20-25g).
- Review the 2018 AAP/EFP classification system and case examples.
- Study the relationship between smoking and periodontal disease: increased risk, reduced BOP.
Radiographic Interpretation and Radiation Safety
Syllabus Focus
- Intraoral and extraoral imaging techniques
- Radiographic anatomy and landmarks
- Caries detection and interpretation
- Periodontal bone loss assessment
- Radiation safety principles (ALARA, dosimetry)
Key Notes
- ALARA principle: As Low As Reasonably Achievable; use appropriate kVp, mA, exposure time, and collimation.
- Intraoral techniques: paralleling technique preferred for periapicals; bisecting angle technique for limited access.
- Radiographic anatomy: lamina dura, periodontal ligament space, alveolar crest, maxillary sinus, mandibular canal.
- Caries appears radiolucent on radiographs; interproximal caries detected on bitewings; occlusal caries may require additional views.
- Periodontal bone loss: horizontal (generalized) vs. vertical (angular) defects; furcation involvement visible on radiographs.
Must Know
- Know the recommended radiographic selection criteria: bitewings every 1-2 years for caries; periapicals for pathology.
- Understand the effects of radiation: deterministic (threshold) vs. stochastic (no threshold); risk of cancer.
- Identify common radiographic errors: elongation, foreshortening, cone-cut, overlapping, motion blur.
- Recognize normal anatomical landmarks: mental foramen, incisive foramen, zygomatic process, hamulus.
Clinical and Exam Application
- When a patient presents with generalized bone loss, use panoramic or full-mouth series to assess severity and pattern.
- For a patient with suspected periapical pathology, take a periapical radiograph to evaluate the apex.
- If a patient has a radiolucent lesion near the mandibular canal, consider referral for CBCT to assess nerve involvement.
High-Yield Distinctions
- Distinguish between caries and cervical burnout: caries is radiolucent with irregular borders; burnout is at CEJ with sharp borders.
- Differentiate between a periapical abscess (radiolucent at apex) and a periodontal abscess (bone loss along root).
- Know the difference between a cyst (well-defined radiolucency) and a tumor (ill-defined, destructive).
Common Pitfalls
- Misinterpreting the mental foramen as a periapical lesion.
- Overlooking early interproximal caries due to overlapping contacts.
- Failing to use lead apron and thyroid collar for all patients, including digital radiography.
Review Tasks
- Practice identifying anatomical landmarks on panoramic and periapical radiographs.
- Review the ALARA protocol and state-specific radiation safety regulations.
- Study the radiographic appearance of common pathologies: caries, periodontitis, cysts, tumors.
Clinical Instrumentation and Calculus Removal
Syllabus Focus
- Instrument grasp and adaptation
- Scaling and root planing techniques
- Sickle scalers, curettes, and ultrasonic scalers
- Calculus detection and removal
- Instrument sharpening and maintenance
Key Notes
- Modified pen grasp is standard; fulcrum should be intraoral or extraoral for stability.
- Adaptation: insert the instrument with the terminal shank parallel to the tooth surface; use a 70-80 degree angle for calculus removal.
- Sickle scalers are used for supragingival calculus; curettes (Gracey, universal) for subgingival scaling and root planing.
- Ultrasonic scalers use vibration and water irrigation; effective for heavy calculus and biofilm disruption; avoid on implants or demineralized surfaces.
- Instrument sharpening: maintain original shape; use a sharpening stone with light oil; test sharpness on a plastic rod.
Must Know
- Know the differences between Gracey curettes: #1-2 (anterior), #3-4 (anterior), #5-6 (anterior/premolar), #7-8 (posterior buccal/lingual), #9-10 (posterior mesial), #11-12 (posterior distal), #13-14 (posterior buccal/lingual).
- Understand the concept of 'working end' and 'cutting edge' for each instrument.
- Recognize when to use a universal curette (e.g., Columbia 4R/4L) vs. area-specific Gracey.
- Identify calculus: supragingival (visible, yellow/white) vs. subgingival (dark, tenacious).
Clinical and Exam Application
- For a patient with heavy supragingival calculus on mandibular anteriors, use a sickle scaler (e.g., Jacquette) for initial removal.
- For subgingival calculus on a maxillary molar, use a Gracey 11/12 for distal surfaces and 13/14 for buccal/lingual.
- When using an ultrasonic scaler, use a light touch and keep the tip moving to avoid root damage.
High-Yield Distinctions
- Distinguish between a sickle scaler (triangular cross-section, sharp tip) and a curette (rounded toe, semicircular cross-section).
- Differentiate between a Gracey 11/12 (distal) and 13/14 (buccal/lingual) by shank angulation.
- Know the difference between a universal curette (can be used on all surfaces) and area-specific curettes (designed for specific surfaces).
Common Pitfalls
- Using a curette with a dull edge, leading to ineffective scaling and root roughness.
- Adapting the instrument at too steep an angle (>90 degrees), causing tissue trauma.
- Failing to maintain a fulcrum, resulting in loss of control and potential injury.
Review Tasks
- Practice instrument sharpening on a typodont or model.
- Review the sequence of instrumentation: supragingival first, then subgingival.
- Study the indications for ultrasonic vs. hand scaling.
Dental Anatomy, Morphology, and Occlusion
Syllabus Focus
- Tooth morphology and identification
- Occlusal relationships and classification
- Root morphology and furcation anatomy
- Developmental anomalies and variations
- Occlusal concepts: centric relation, centric occlusion, working/non-working contacts
Key Notes
- Each tooth has unique features: maxillary central incisor (largest incisor, cingulum), mandibular first premolar (small, lingual tilt), maxillary first molar (three roots, oblique ridge).
- Occlusal classification: Angle Class I (normal), Class II (distal), Class III (mesial); subdivisions for unilateral.
- Root morphology: maxillary molars have three roots (two buccal, one palatal); mandibular molars have two roots (mesial and distal).
- Furcation anatomy: maxillary molars have furcation on buccal and mesial/distal; mandibular molars have buccal and lingual furcations.
- Centric relation (CR) is the maxillomandibular relationship when the condyles are in the most superior-anterior position; centric occlusion (CO) is habitual occlusion; discrepancy may indicate occlusal issues.
Must Know
- Know the eruption sequence: primary (A-J) and permanent (1-32); typical eruption ages.
- Identify tooth numbering systems: Universal (1-32), Palmer (quadrants), FDI (two-digit).
- Understand the concept of 'curve of Spee' and 'curve of Wilson' in occlusion.
- Recognize common anomalies: dens invaginatus, talon cusp, gemination, fusion, microdontia.
Clinical and Exam Application
- When restoring a tooth, consider its morphology: e.g., maxillary first molar has an oblique ridge that must be preserved.
- For a patient with Class II malocclusion, assess for increased overjet and potential for trauma.
- When scaling a mandibular molar, be aware of the distal root concavity and furcation entrance.
High-Yield Distinctions
- Distinguish between a maxillary first and second molar: first has a cusp of Carabelli, second has a more rhomboidal shape.
- Differentiate between a mandibular first and second premolar: first has a lingual tilt, second has a more symmetrical occlusal table.
- Know the difference between working (laterotrusive) and non-working (mediotrusive) contacts: working side contacts are desirable; non-working contacts are potentially harmful.
Common Pitfalls
- Confusing the mandibular first premolar with a canine due to its small size and lingual tilt.
- Misidentifying the maxillary second molar as a first molar due to similar anatomy.
- Overlooking the presence of a supernumerary tooth (e.g., mesiodens) on radiographs.
Review Tasks
- Practice identifying teeth on a typodont or extracted teeth.
- Review the Angle classification and its clinical implications.
- Study the root canal anatomy for each tooth type.
Infection Control, Ethics, and Jurisprudence
Syllabus Focus
- Standard precautions and OSHA regulations
- Sterilization and disinfection protocols
- Bloodborne pathogens and exposure management
- Ethical principles (autonomy, beneficence, nonmaleficence, justice)
- State dental practice acts and scope of practice
Key Notes
- Standard precautions apply to all patients: gloves, mask, eyewear, gown; hand hygiene before and after patient contact.
- OSHA requires a written exposure control plan, hepatitis B vaccination, and annual training.
- Sterilization: autoclave (steam) for heat-tolerant instruments; chemical sterilants for heat-sensitive items; biological monitoring weekly.
- Ethical principles: autonomy (patient's right to choose), beneficence (do good), nonmaleficence (do no harm), justice (fairness).
- Jurisprudence: dental hygienists must practice within their scope as defined by state law; delegation of duties varies by state.
Must Know
- Know the steps for managing a needlestick injury: wash, report, evaluate source, post-exposure prophylaxis.
- Understand the difference between disinfection (reduces microorganisms) and sterilization (eliminates all).
- Identify the types of waste: regulated medical waste (sharps, blood-soaked items) vs. general waste.
- Recognize the ethical obligation to report suspected abuse or neglect (mandatory reporting).
Clinical and Exam Application
- When a patient refuses radiographs, respect autonomy but document informed refusal and explain risks.
- If a colleague is practicing outside their scope, report to the state board (nonmaleficence and justice).
- For a patient with a bloodborne disease (e.g., HIV), treat with standard precautions; no additional barriers needed.
High-Yield Distinctions
- Distinguish between OSHA (workplace safety) and CDC (infection control guidelines).
- Differentiate between ethics (moral principles) and jurisprudence (laws).
- Know the difference between a dental hygienist's direct supervision (dentist on premises) and general supervision (dentist available but not necessarily present).
Common Pitfalls
- Assuming that gloves replace hand hygiene; always wash hands before and after gloving.
- Failing to document exposure incidents immediately.
- Confusing state-specific scope of practice with national guidelines.
Review Tasks
- Review the OSHA bloodborne pathogens standard and your state's dental practice act.
- Practice proper donning and doffing of PPE.
- Study the ADA Principles of Ethics and Code of Professional Conduct.
How To Use These Notes With Practice Questions
Do not jump straight from reading to a full mock. Work by subject first: review the key notes, make a short recall sheet from memory, then answer a focused question set. After each miss, decide whether the problem was missing knowledge, poor clinical sequencing, weak source-rule recall, or a distractor you failed to eliminate.
Dental Conquer's question bank, flashcards, mind maps, and spaced review tools are most useful after this instruction layer because they reveal which parts of the notes are not yet retrievable.
Final Review Checklist
- Review all subject keyNotes and mustKnow items; focus on high-yield distinctions and common pitfalls.
- Practice clinical skills on typodonts and simulated patients to reinforce instrumentation and assessment techniques.
- Take practice exams under timed conditions to build speed and accuracy.
- Verify exam-specific details (format, pass mark, dates) with the official SRTA or ADEX website.
- Ensure you understand the 2018 AAP/EFP periodontal classification and ADEX clinical assessment criteria.
Official Sources and Further Reading
Use these sources as the final authority for format, eligibility, rules, and exam updates. Study notes are a preparation layer, not a replacement for official candidate guidance.