AGD Dental Materials & Technology

Question 1

What is a common material used for dental fillings?

Accepted Answer

Composite resin

Answer

Composite resin is a widely favored material for dental fillings due to its excellent aesthetic properties, as it can be matched to the natural tooth color, making restorations virtually invisible. It is a durable mixture of plastic and glass particles that is bonded directly to the tooth structure. This material is versatile, suitable for restoring decayed or fractured teeth in both anterior and posterior regions.

Question 2

Why is curing light used in restorative dentistry?

Accepted Answer

To harden resin materials by light activation

Answer

Curing lights are essential tools in restorative dentistry, emitting a specific wavelength of blue light that activates photoinitiators within resin-based dental materials like composite fillings and bonding agents. This light energy causes the material to polymerize and harden rapidly, allowing the dentist to sculpt and set the restoration efficiently. Proper curing is critical for ensuring the strength, durability, and longevity of the dental restoration.

Question 3

Which material is most suitable for making dental crowns?

Accepted Answer

Porcelain or zirconia

Answer

Porcelain and zirconia are highly suitable materials for dental crowns due to their exceptional aesthetic qualities, closely mimicking the natural appearance and translucency of teeth. Zirconia also offers superior strength and durability, making it ideal for posterior teeth, while porcelain provides excellent aesthetics for anterior restorations. Both materials are biocompatible and resistant to wear, ensuring long-lasting and functional crowns.

Question 4

What is CAD/CAM technology used for in dentistry?

Accepted Answer

To digitally design and fabricate restorations

Answer

CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) technology has revolutionized restorative dentistry by enabling dentists to digitally design and mill dental restorations such as crowns, inlays, onlays, and veneers directly in the office. This process involves scanning the prepared tooth, designing the restoration on a computer, and then fabricating it from a block of material using a milling machine. It significantly reduces treatment time, enhances precision, and improves efficiency.

Question 5

Which cement is known for its fluoride-releasing property?

Accepted Answer

Glass ionomer

Answer

Glass ionomer cements are unique among dental materials for their ability to release fluoride ions over time, which helps to prevent secondary caries (cavities forming around the restoration). This fluoride-releasing property makes them particularly beneficial for restorations in high-caries-risk patients or as a base/liner under other restorative materials. They also form a chemical bond with tooth structure, offering good marginal seal.

(AGD) Academy of General Dentistry Certification Practice Test

(AGD) Academy of General Dentistry Certification Practice Test

AGD Dental Materials & Technology