CDC CDC Dental Materials & Technology 1 — Questions and Answers
Question 1: Which type of intraoral radiograph shows the entire tooth from crown to root apex along with the surrounding alveolar bone?
- Bitewing radiograph
- Periapical radiograph (Correct answer)
- Occlusal radiograph
- Panoramic radiograph
Correct answer: Periapical radiograph
A periapical radiograph captures the entire tooth—crown, root, and surrounding bone—making it the primary view for diagnosing periapical pathology and root abnormalities.
Question 2: Which property of dental amalgam has historically made it the gold standard for posterior restorations?
- Esthetic appearance matching tooth color
- Exceptional durability and wear resistance (Correct answer)
- Chemical bonding to tooth structure
- Fluoride-releasing capability
Correct answer: Exceptional durability and wear resistance
Dental amalgam's outstanding durability and wear resistance under masticatory forces have historically made it the benchmark material for posterior restorations.
Question 3: What is the primary advantage of digital radiography over conventional film-based radiography?
- Lower initial equipment cost
- Superior resolution of fine enamel detail
- Significantly reduced radiation exposure and immediate image availability (Correct answer)
- No requirement for processing software
Correct answer: Significantly reduced radiation exposure and immediate image availability
Digital radiography reduces patient radiation exposure by up to 90% compared to conventional film and provides instant images without darkroom processing.
Question 4: Which property of a dental luting cement measures its resistance to breakdown by oral fluids?
- Compressive strength
- Solubility (Correct answer)
- Film thickness
- Working time
Correct answer: Solubility
Solubility measures how much a cement dissolves in oral fluids; low solubility is essential for maintaining the marginal seal and preventing secondary caries under restorations.
Question 5: What does CAD/CAM stand for in modern dental technology?
- Computer-Aided Design/Computer-Aided Manufacturing (Correct answer)
- Ceramic Alloy Design/Ceramic Alloy Manufacturing
- Computer-Automated Dental/Computer-Automated Milling
- Crown and Die/Crown and Mold
Correct answer: Computer-Aided Design/Computer-Aided Manufacturing
CAD/CAM—Computer-Aided Design/Computer-Aided Manufacturing—uses digital scanning and milling to design and fabricate dental restorations chairside or in the lab.
Question 6: Which elastomeric impression material achieves the highest dimensional accuracy by setting through an addition polymerization reaction?
- Alginate (irreversible hydrocolloid)
- Zinc oxide eugenol paste
- Addition silicone (polyvinyl siloxane, PVS) (Correct answer)
- Polysulfide rubber
Correct answer: Addition silicone (polyvinyl siloxane, PVS)
Addition silicone (PVS) undergoes addition polymerization with virtually no byproducts, yielding superior dimensional stability and the highest accuracy among elastomeric impression materials.
CDC CDC Dental Materials & Technology 1
Which type of intraoral radiograph shows the entire tooth from crown to root apex along with the surrounding alveolar bone?