Mixed Deck — All ABE Topics Flashcards

What role does continuing education play in Diagnostic Methods?

Answer: Keeping practitioners current with evolving best practices and new developments

Continuing education ensures practitioners stay current with advances in their field.

An internal resorption defect noted on CBCT is histologically characterized by:

Answer: Odontoclasts within dentinal tubules resorbing dentin from the canal lumen outward

Internal resorption is caused by odontoclasts (clastic cells) present within the pulp space that resorb dentin from the canal walls outward.

Which component of zinc oxide eugenol (ZOE) sealers is responsible for its cytotoxic effects?

Answer: Free eugenol

Free unbound eugenol is primarily responsible for the cytotoxicity of ZOE sealers, as it can irritate periapical tissues.

Calcium hydroxide exerts its antimicrobial effect primarily through:

Answer: High pH causing protein denaturation and enzyme disruption

Calcium hydroxide's pH of approximately 12.5 causes protein denaturation and disrupts enzyme activity in bacterial cells.

Which pattern of periapical cyst behavior has been proposed to explain why some cysts do NOT heal after successful root canal treatment?

Answer: True cyst — completely enclosed epithelial cavity independent of the canal

True cysts have a completely enclosed epithelial lining and are self-sustaining independent of the root canal, potentially not resolving with root canal treatment alone.

How does technology impact modern practices in Diagnostic Methods?

Answer: Technology improves efficiency, accuracy, and access to information while requiring new skills

Technology enhances capabilities while also requiring practitioners to develop new competencies.

Biofilm within the root canal system is significant because bacteria in biofilm state exhibit:

Answer: Up to 1000-fold greater resistance to antimicrobials

Biofilm bacteria can be up to 1000 times more resistant to antimicrobials than planktonic (free-floating) bacteria.

The primary advantage of using a fiber post over a cast metal post-and-core is:

Answer: Modulus of elasticity similar to dentin, reducing root fracture risk

Fiber posts have a modulus of elasticity (approximately 18-40 GPa) closer to dentin (18 GPa), distributing stress more evenly and reducing catastrophic root fractures.

Which type of root resorption following tooth replantation indicates PDL cell death and direct bone-to-cementum fusion?

Answer: Replacement resorption (ankylosis)

Replacement resorption (ankylosis) occurs when necrotic PDL cells are replaced by bone, fusing the root directly to alveolar bone without an intervening PDL.

A patient presents with pain reproduced only when biting on a specific cusp. Cold test produces sharp but non-lingering pain. What is the MOST likely diagnosis?

Answer: Cracked tooth with symptomatic reversible pulpitis

Pain elicited by biting on a specific cusp combined with a normal (non-lingering) cold response suggests a cracked tooth with reversible pulpal inflammation.

What makes a professional competent in Root Canal Procedures?

Answer: A combination of education, practical experience, ongoing learning, and adherence to professional standards

Competence requires the integration of knowledge, skills, experience, and professional conduct.

How should ethical dilemmas be handled in Diagnostic Methods?

Answer: Follow established ethical guidelines, consult with supervisors, and prioritize stakeholder welfare

Ethical decision-making requires following professional guidelines and prioritizing the welfare of all stakeholders.

Which cytokine plays a DUAL role in apical periodontitis — promoting inflammation in early stages but also stimulating osteoblast activity and bone repair in healing phases?

Answer: Interleukin-6 (IL-6)

IL-6 has pleiotropic effects — it promotes acute inflammation and B-cell differentiation but also stimulates osteoblasts and contributes to bone healing after infection control.

What is the most important foundational concept in Dental Anatomy and Pathology?

Answer: Understanding core principles and their practical application in Dental Anatomy and Pathology

Core principles provide the foundation for all decision-making and practice in Dental Anatomy and Pathology.

How should ethical dilemmas be handled in Root Canal Procedures?

Answer: Follow established ethical guidelines, consult with supervisors, and prioritize stakeholder welfare

Ethical decision-making requires following professional guidelines and prioritizing the welfare of all stakeholders.

A patient presents with an immature maxillary central incisor that suffered a luxation injury 18 months ago. The tooth is asymptomatic but shows no response to EPT and a periapical radiolucency is present. What is the MOST appropriate initial management?

Answer: Regenerative endodontic procedure (REP)

A REP is the preferred first-line treatment for necrotic immature permanent teeth because it offers the possibility of continued root development and wall thickening, improving long-term prognosis over apexification alone.

In the context of endodontic microbiology, quorum sensing is best described as:

Answer: Cell-to-cell communication via chemical signals regulating virulence gene expression

Quorum sensing is a chemical signaling system (autoinducers) that allows bacteria to coordinate virulence gene expression based on population density.

What is the significance of documentation in Dental Anatomy and Pathology?

Answer: It provides a record for accountability, quality assurance, and legal compliance

Proper documentation supports accountability, enables quality review, and satisfies legal requirements.

A tooth that has undergone root canal treatment is still symptomatic 6 months post-treatment. A periapical biopsy reveals hyphae and yeast forms. The most likely causative organism is:

Answer: Candida albicans

Candida albicans is the most commonly identified fungal species in persistent endodontic infections, demonstrating both yeast and hyphal (dimorphic) forms.

Which local anesthetic concentration is most commonly used to achieve hemostasis during endodontic surgery?

Answer: 2% Lidocaine with 1:50,000 epinephrine

2% lidocaine with 1:50,000 epinephrine provides superior local hemostasis due to the highest epinephrine concentration available in dental cartridges.