Dentistry Study Guide

📖 Core Concepts Dentistry – medical branch dedicated to teeth, gums, mouth, and related craniofacial structures. Oral‑systemic health – infections/inflammation in the mouth can influence systemic diseases (e.g., diabetes, heart disease, preterm birth). Dental team – dentist + dental assistants, hygienists, technicians, therapists; often collaborates with physicians and specialists. Evidence‑Based Dentistry (EBD) – combines best research evidence, clinician expertise, and patient values to guide care. Dental specialties – 12 recognized fields (e.g., orthodontics, periodontology, oral‑maxillofacial surgery, geriatric dentistry). Prevention – twice‑yearly professional cleanings + proper home oral hygiene are the cornerstone of disease control. 📌 Must Remember Most common oral diseases: dental caries & periodontal disease (gingivitis/periodontitis). Key preventive recommendation: brush twice daily, floss, fluoride use, and professional cleaning ≥ 2×/year. Prescription authority: dentists may prescribe antibiotics, sedatives, analgesics, and other meds. Occupational hazards: mercury vapor (amalgam), nickel ions, disinfectant chemicals (glutaraldehyde, hydrogen peroxide), noise from ultrasonic devices. EBD triad: best evidence + clinical expertise + patient preferences = optimal decision. Digital tools: CAD/CAM, AI‑assisted imaging, electronic health records (EHR) improve accuracy and workflow. 🔄 Key Processes Diagnosing caries/periodontal disease Clinical exam → radiographs → risk assessment → treatment plan. Restorative workflow (fillings, crowns, bridges) Decay removal → tooth preparation → impression (digital or conventional) → CAD/CAM design → fabrication → cementation. Root canal therapy Access cavity → pulp removal → cleaning/shaping → obturation → coronal seal. Periodontal therapy Scaling & root planing → reassess → consider surgical intervention if pockets persist. Infection control Hand hygiene → PPE → surface disinfection (proper ventilation for chemicals) → instrument sterilization. 🔍 Key Comparisons Dental Caries vs. Periodontal Disease Etiology: bacteria ferment sugars → acid demineralization (caries) vs. plaque‑induced inflammation of supporting tissues (periodontitis). Primary site: enamel/dentin (caries) vs. gingiva/alveolar bone (periodontitis). Amalgam vs. Composite Restorations Composition: 50 % mercury alloy vs. methacrylate resin. Pros/Cons: Amalgam → durable, inexpensive, mercury exposure risk; Composite → aesthetic, bond to tooth, possible polymerization shrinkage. CAD/CAM vs. Conventional Lab Turnaround: same‑day milled restoration vs. days‑to‑weeks shipping. Accuracy: digital scanning reduces distortion; conventional relies on physical impressions. ⚠️ Common Misunderstandings “All mercury is dangerous.” – Only vaporized mercury from amalgam placement/removal poses measurable exposure; sealed amalgam releases negligible amounts. “Periodontal disease only affects gums.” – It progresses to bone loss, tooth mobility, and systemic inflammation. “Dentists cannot prescribe antibiotics.” – They have full prescribing authority for dental‑related infections. “Digital tools replace clinical judgment.” – AI assists interpretation; final decisions still rest on clinician expertise and patient context. 🧠 Mental Models / Intuition “Cavity cascade”: Sugar → plaque acid → enamel demineralization → dentin exposure → pulp involvement → need for restoration. “Inflammation conduit”: Oral infection → cytokine spillover → systemic inflammation → increased risk of diabetes/heart disease. “Three‑layer safety net” in EBD: Evidence ↔ Clinician ↔ Patient → best outcome. 🚩 Exceptions & Edge Cases Patients with metal allergies – avoid nickel‑containing alloys and consider ceramic or titanium restorations. Pregnant patients – avoid radiographs unless essential; use shielding. Severe xerostomia – fluoride varnish and saliva substitutes become essential preventive measures. Immunocompromised patients – may need prophylactic antibiotics for invasive procedures. 📍 When to Use Which Restorative material choice – Use amalgam for posterior high‑stress teeth in patients without mercury concerns; choose composite for anterior/esthetic zones or mercury‑sensitive patients. Imaging modality – Bitewing radiographs for caries detection; panoramic/CBCT for surgical planning or impactions. Periodontal therapy – Non‑surgical scaling for pockets ≤ 5 mm; surgical approach for persistent deep pockets or furcation involvement. Sedation vs. General Anesthesia – Light sedation for anxious adults; general anesthesia (or dental anesthesiology) for extensive surgery, pediatric, or special‑needs patients. 👀 Patterns to Recognize “Caries‑risk pattern”: frequent sugary snacks + poor fluoride → rapid enamel lesions on pits/fissures. “Periodontal‑risk pattern”: smoking + diabetes → accelerated bone loss and deeper pockets. “Digital‑diagnostic pattern”: AI‑highlighted radiolucency in periapical area → suspect early apical pathology. “Occupational‑hazard pattern”: recurring dermatitis on hands → likely glutaraldehyde or methacrylate exposure. 🗂️ Exam Traps Distractor: “All dental caries are caused by poor brushing.” – Wrong; diet and fluoride also critical. Distractor: “Mercury in amalgam is a proven carcinogen for patients.” – Overstates risk; primary concern is occupational exposure to vapor. Distractor: “EBD eliminates the need for clinical experience.” – Incorrect; expertise remains a core component. Distractor: “All dental specialties require a medical degree.” – Only oral‑maxillofacial surgery may require dual degrees in some countries. Distractor: “Noise from ultrasonic scalers is harmless.” – Can cause hearing loss; proper hearing protection is recommended. --- Use this guide for rapid recall before your exam – focus on the bolded key terms, contrast lists, and decision‑rules to maximize confidence.