Dental Procedures & Techniques Flashcards

What is the typical outline form of the endodontic access cavity for a maxillary first molar?

Answer: Rhomboidal (triangular), with the base toward the buccal

The maxillary molar access is rhomboidal/triangular to reach the MB, DB, and palatal orifices, including the MB2.

Where is the working length usually set during conventional root canal instrumentation?

Answer: Approximately 0.5–1 mm short of the radiographic apex

Ending 0.5–1 mm short of the radiographic apex approximates the apical constriction (minor diameter).

During irrigation, sodium hypochlorite is extruded past the apex and the patient has sudden severe pain and swelling. What is the best immediate management?

Answer: Stop, reassure the patient, apply cold compresses, and give analgesics, with antibiotics if infection develops

Hypochlorite accidents are managed supportively: cold compresses first, then analgesics, monitoring, and antibiotics or referral when needed.

Which material is most commonly used as an intracanal medicament between endodontic appointments?

Answer: Calcium hydroxide paste

Calcium hydroxide's high pH makes it antibacterial and lets it dissolve tissue, which is why it is the standard interappointment medicament.

What is the recommended minimum occlusal thickness for an amalgam restoration so it resists fracture?

Answer: 1.5–2.0 mm

Amalgam is brittle and needs about 1.5–2.0 mm of bulk to withstand occlusal forces.

Why is composite resin placed in increments of 2 mm or less in deep posterior preparations?

Answer: To reduce polymerization shrinkage stress and ensure adequate light cure depth

Thin increments cure fully and lower the C-factor shrinkage stress at the bonded margins.

What cavosurface margin angle is ideal for an amalgam preparation?

Answer: Approximately 90° (butt joint)

Amalgam has low edge strength, so a butt-joint margin is needed to prevent marginal fracture.