Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

10 Questions

0 Views

Lec.1 Dental Materials

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the undesirable property of amalgam filling material for posterior teeth?

It dissolves in saliva

It has high water absorption

It expands when exposed to heavy biting force

It changes shape permanently when subjected to heavy biting force (correct)

What is the purpose of expansion in investment material for dental casting?

To increase the strength of the dental casting

To compensate for the contraction of molten metal after cooling (correct)

To improve the aesthetics of the dental restoration

To reduce the solubility of the material in water

Why is high water absorption undesirable in dental materials?

It can lead to unhygienic conditions and dimensional changes (correct)

It causes the material to change shape permanently

It leads to increased solubility of the material

It reduces the strength of the material

What is the unit of measurement for solubility of dental materials?

µg/mm² Signup and view all the answers

Why is density an important consideration in restorative materials?

It affects the weight and mobility of the restoration Signup and view all the answers

Match the following materials with their coefficient of thermal expansion (α) in dentistry:

Tooth = 1110-6 cm/cm°C Gold = 1410-6 cm/cm°C Impression compound = 250*10-6 cm/cm°C Signup and view all the answers

Match the following clinical importance with the correct reason:

Preventing marginal leakage = To prevent pressure on the pulp or pull away from the cavity wall Providing metal ceramic bonding = To avoid crazing of artificial tooth and denture base Maintaining 2-dimensional stability = To prevent breakage of marginal seal between the filling and the cavity wall Avoiding recurrent caries = To prevent discolouration and hypersensitivity Signup and view all the answers

Match the following materials with their coefficient of thermal expansion ranking in dentistry:

Hard tooth structure = Smallest Metals = Intermediate Polymers = Largest Signup and view all the answers

Match the following consequences with the correct cause:

Marginal leakage = Difference in coefficient of thermal expansion between tooth and restorative materials Discolouration = Poor metal ceramic bonding Recurrent caries = Crazing of artificial tooth and denture base Hypersensitivity = Breakage of marginal seal between the filling and the cavity wall Signup and view all the answers

Match the following requirements with the correct material property:

Dimensional stability = To prevent changes in shape after setting Coefficient of thermal expansion = To prevent marginal leakage and recurrent caries 2-dimensional stability = To prevent changes in shape after hardening No dimensional changes after setting = To prevent breakage of marginal seal between the filling and the cavity wall Signup and view all the answers